,

. ~ A Remote-Controlled, Multi-Channel, Analog-Data,

. , . \J- .. i ""'--:. O-FO rll~-ill~II-~lril-imiii-Oirqu---" TeI.:e~YDi~:5t.m .~.'. j - 1 0034765

., . ~ i Report Series/ BI-R.73.11/September 1973

•

•

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B:CDFORD INSTITlYl'E OF OCEANOGRAPHY

Dartmouth, Nova Scotia Canada

A REMOTE-CONTROLLED, MULTI-CHANNEL,

ANALOG-DATA TELEMETRY SYSTEM

by

D.F. Dinn

Atlantic Oceanographic Laboratory Marine Sciences Directorate

Department of the Environment

This is an internal technical report which has received only limited circulation. On citing this report the reference should be followed by the words 'UNPUBLISHED MANUSCRIPT'.

September 1973 REPORT SERIES BI-R-73-ll

o

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ABSTRACT

A remote-controlled, l3-channel, analogue-data telemetry system

operating on IRIG proportional bandwidth FM channels and telemetering via

an FM, VHF radio link has been developed. The system is intended for un­

attended operation at sea on a stable platform and is powered from a sub­

merged battery pack which is limited to water depths of 90 metres. Integral

signal conditioners enable data from a resistive wavestaff, an Aerovane

anemometer, a three-component thrust anemometer, and from a fast response

thermistor to be normalized and telemetered to a shore-based receiving

station within a 20-nautical mile range •

This report reviews the development of the system, presents a

detailed system dcscriptioY: , and recommends procedures for system calibration.

o

1.

2.

3.

4.

5.

(ii )

TABLE OF CONTENTS

Abstract ......................................... . ( l· )

List of Tables ................................... . (iii)

List of Figures . .................................• (i v)

Purpose .......................................... .

Evolution ........................................ .

General Description .............................. .

3.1 3.2

Shore Equipment ......................•...... Remote Equipment ........................... .

Detailed Description of Remote Equipment .....•....

4.1 4.2 4.3 4.4 4.5 l~ . 6 4.7 4.8 4.9 4.10 4.11 4.12 4.13 4.14 4.15

4.16 4.17 4.18 4.19

4.20 4.21 4.22

Battery Power .............................. . Main Vol tag;e Regulators .................... . Battery Voltage Monitor ....................• Low-Current Voltage Regulators ............. . Thrust Anemometer P~plifiers ............... . Thrust Anemometer Cover .................... . Wave Measuring Circuitry ...............•.... Aerovane Anemometer ........................ . Temperature Measurement .................... . External Signals ........................... . VCO Input Limiting ...................•.•.... Voltage Controlled Oscillators ............. . Modulation Control Amplifier ............... . Telemetry Transmitter ...................... . Interwiring on Deck 6 of the Electronics

Package ............................... . Antennas ................................... . Command Receiver ........................... . Detectors .................................. . Interconnections on Deck 3 of the Electronics

Package .............................. . Control Circuitry .......................... . Command Ret ransmi t ......................... . Operation of the Remote Equipment from the

Stable Platform ....................... .

Detailed Description of Shore Equipment

5.1 5.2 5.3 5.4

Command Encoding and Transmission .......... . Audio Panel ................................ . Antenna and Telemetry Receiver ............. . Multiplex/Reference Combiner ............... .

1

1

5

5 8

14

14 15 17 17 21 24 27 31 33 35 35 38 40 41

41 41 43 43

45 45 63

63

65

65 68 70 70

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(iii )

Contents continued

6 .

7·

8.

9.

10.

Appendix A:

Appendix B;

Table 1: ?: 3: 4:

5:

5.5 5.6 5./

Tape Recorder .....................•......•.. Data ~oni toring ......................•...... Command Readout Unit .................•.....•

Remote Equipment Calibration ...............•......

6.1 6.2 6.3 6.4 6.5 6.6 6./ ~ .8

Equipment .............................•..... Regulator Adjustments .................•..... Thrust Anemometer fuiplifier Adjustment •..... Battery Voltage Monitor ............•........ Wavestaff Electronics Board ................ . VCO Calibrate Voltages ..................... . VCO Adjustments ............................ . Transmitter Deviation ...................... .

Shore Equipment Calibration

/.1 7.2 7.3 7.4

Equipment ............•...................•.. Command Ene oder ......•..•............•.....• MPX/Reference Combiner ............•...•.••.. Discriminators .......................•.•••..

Conclus ion ......•...................•.••••••..•.•.

Acknowledgements ...............•.............•....

References ......................•...........••••..

Addi tional Gysten. Tnformation

Telemetry Syst em Pin Listings

LIST OF TABLES

IRIG Standard Frequencies ............•.••......... IRIG Channel Allocations ............••............ COllllnand Directory for the Telemetry System ..•.•... Air Sea Interaction Telemetry System -

Drawing List ........•...••.••...•...•••.....• Battery Life •.............•......•..•......••..•..

72 72 75

76

76 76 79 81 81 84 84 86

86

87 87 87 88

88

91

100

9 lh 50

91 99

Fir,ure 1:

2:

3:

4:

5:

6:

7:

8:

9:

10:

11:

12:

13:

14:

15:

16:

17:

18:

19:

20:

(iv)

LIST OF FIGURES

tJ:ap of Halifax l:arbour and Approaches Shovring the Stablf Platform Location ................... .

Telemetry System, Shore Equipment

Telemetry ::,fstem, Shore Equipment Block Diagram .

Telemetry System, Rerr:ote Equipn.ent Electronics Package

Telemetry Systerr, Remote Lquipment Electronics Package, Cover Removed ........................•.....•....

Telemetry System, Remote Equipment Block Diagram

Remote Equipment, Schematic, Main Regulators ....

Remote Equipment, Schematic Battery Voltage Monitor Circui t ....•.......•....•....•..................

Remote E~uipment, Schematic, Low-Current Regulators

Remote Equipment, Schematic, Thrust Anemometer Amplifiers .................................... .

Thrust Anemometer Cover ........................ .

Thrust Anemometer Cover, Wiring Diagram ........ .

Flexible Resistive Wave f'taff .................. .

Remote Equipment, Schematic, Wave Staff Electronics Board ......................•....................

Remote Equipment, Schematic, Wave Height Signal Amplifier ......................................•

Control Circuit for Modified Aerovane Anemometer .

(a) Remote Equipment, Schematic, 'Iemperature Probe Circuit .........................•...•..

(b) Remote Equipment, Schematic, Deck 2 ........ .

Remote Equipment, Schematic VCO Input Limiters "

Remote Equipment, Schematic, Deck 6 ............ .

Eemote Equipment, Schematic, Turn-On Detector ...

4

6

7

10

11

13

16

18

20

23

25

26

28

30

32

34

36 37

39

42

44

(v)

Figures continued

Figure 21:

22:

23:

24:

25:

26:

27:

28:

29:

30:

31:

32:

33:

34:

35:

36:

37:

38:

39:

40:

41:

Remote Equipment, Schematic, Command Detector ...

Remote Equipment, Schematic, Deck 3 ........•....

Remote Equipment, Schematic, Command Decoding Circuitry ....................•..................

Remote Equipment, Schematic, Relay Control Circuit (HCC) .......................................... .

Voltage Waveforms f'ertaining to Figure 23 During the Decoding of Command 36 ........••••.•....••..

Remote Equipment, Schematic, Thrust Anemometer Amplifier Gain and Offset Command Decoding Circuitry

Remote Equipment, Schematic, Test Unit ...•.•...•

Shore Equipment, Interconnection Diagram .....•.•

Shore EquipmE'nt, Schemati c, Command Encoder .....

Shore EquipmE!nt, Schematic, Audio Panel ........ .

Shore Equipment, Schematic, MPX/Reference Combiner

Typical Frequency Response of a Discriminator 11 Hz, Linear-Pllase Output Filter .............•........

Shore Equipment, Schematic, Command Readout Unit.

Remote Equiprr,ent, Subassembly, Regulator Board

Remote Equipment, Subassembly, Amplifier Board

Remote Equipr ent, Subassembly, Deck ~ Components

Remote Equipment, Subassembly, Havestaff Electronics Board .................•.............•.•.........

Remote Equipment, Wiring Diagram, Deck 1 III III III III III III III III

Remote Equipment, Interdeck Wiring Diagram III III III III III III

Remote Equipment, Sensor Cables III III III III III III III III III III III III III III III III III

Remote Equi.pwent, Sensor Csoles III III III III III III III III III III III III III III III III III

46

47

53

55

57

59

64

66

71

74

77

80

82

83

85

94

95

97

1. PURPOSE

This handbook presents a summary of the evolution, design, opere.tion,

and maintenance requirements c·f a 13--channel, remotely controlled, analog­

data, telemetry syste1'l produced b,Y SvsteJ'l'ls Enei.neering group for the Air­

Sea Intera.ction group at U e Atlantir Oceanographic Laboratory, Bedford

Institute. The handrook :i s intended primarily for documentation and to give

its users sufficient knowled.ge of the sy3tem to ensure that it is calibrated

and used in a manner that will ensure reliable results.

2. EVOLUTION

The Air-Sea Interaction group is concerned with investigating the

transfers which take place· between the air and the sea. It has been realized

for some time that these transfers play a large part in determining climatic

conditions on the earth. The s tress of t~e winds on the ocean surface, the

transfer of heat, the evaporation rate from the oceans, the stability of

stratification of the air near the ocean surface, and. the sea state are five

parameters which can be derived from the fluctuations of wind velocity, tem­

erature, humidity and wave height. It is desirable to measure these para­

meters in a location sufficiently far from land so that the effect of the

sea/land boundary conditions may be considered negligible. The location

chosen in 1967 by the Air-Sea Interaction group was a point two miles from

the nearest la.nd in the approaches to Halifax Harbour (44 °27'33"N, 63°31'45"W).

A special thrust anemometer VTas developed by the Air-Sea Interaction

group (Doe, 1963) to measure wind turbulence in three orthogonal compor-ents.

The anerrometer is sensitive to accelerations and in order to obtain mean­

ingful measurements it is practically essential that a stable structure be

used for mounting the anemometer. A less stable structure could be utilized

if the response of the ~emometer to accelerations was determined and the

accelerations of the mounting structure were measured and recorded. The

Air-Sea Interaction group cho~e the stable platform approach and over a period

of several years a floating structure, referred to as the Mark I stable

platform, was developed.

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The platform would likely be inaccessible in high winds and/or high

sea states when the more scientifically interesting phenomena would be

occurring. 'rhus some means of transmitting the measured data to a shore

receiving station and of controlling the platform instrumentation was

required. An electrical cable connection was not feasible owing to the high

in~tial cost, the expense of laying and the limited usefulness of a cable

circuit. As a result, FM radio telemetry appeared to be a highly suitable

method. A VHF telemetry link (228.0 MHz) was chosen for the platform-to-shore

path and a UHF control link (465.2 ~Iz) from shore-to-platform. Frequency­

division-multiplexing was considered to be a suitable method of transmittin~

a number of channels of data simultaneously. Tone burst keying, utilizing

a telephone type dial to generate coded commands, enabled control of the

remote instrumentation to be accomplished.

A command and telemetry system as outlined above was developed in

conjunction with the stable platform. 'llhe platform., together with the

Mark VI thrust anemometer, an Aerovane anemometer an~ the telemetry system

was installed at the selected site in 1967. The scientific results from

this installation (Smith et al., 1969) were encouraging but the telemetry

system proved to be marginally reliable. Also it was generally felt that

wind speeds higher than those previously encountered at the relatively

sheltered site (0-15 m/s) were required. These facts, together with com­

plaints from local fishermen, led to the removal of the platform in October

1968.

A more exposed location (44°29'26"N, 63°23'3l"W) was chosen in the

approaches to Halifax Harbour (Fig. 1) and the Mark II stable platform, a

bottom.-mounted structure, was installed in April 1969. The original command

and telemetry system was refurbished and its design improved to increase

reliability. The instrumentation was installed on the platform in September

1969 and meaningful data on w~nd turbulence was collected at a telemetry

receiving station based at Osborne Head (Smith, 1970).

In December 1969, after numerous mooring problems, the stable

platform failed in a '"' evere storm and all equipment on it was lost OYer­

board. In order to continue the Air-Sea Interaction study, a replacement

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command alld telemetry system was required hence a new design was begun

immediately. At the same time the Mark III stable platform was being

fabricated (Mills~ 1972). This structure was moored in October 1970 in

the same location as Mark II (Figure 1). During the same month the tele­

met~y system and instrumentation were placed on the structure. The system

operated reliably for the duration of the experiment (Mills, 1972) which

was terminated abruptly in December 1970 when the Mark III platform was

damaged in rough seas. The telemetry system was recovered in this instance.

The design of the repla.cement command and telemetry system closely

followed. the original for reasons of econony, as a consid.erable investment

had already been n:ade in spares. Significant iJllprovements and changes,

however, were incorporated.

Circuitry was added to enable meaS1ITements of wave height, air

temperature, and battery voltage to be made. Provision for utilizing the

thrust and AeY'ovane anemometers was, of course, retained. To enable an

assessment of the performance of the stable platform, provision for inter­

facing a three-component accelerometer and four mooring-wire load cells

was incorporated in the system.

To improve reliability, waterproof connectors .lere specified for

all signal and pOI'ler connections to the tel~metry package. A specially

designed submersible e;land was fabricated for the entry of r.f. coaxial

connections (Vine, 1970). Further improvement in reliability was gained

by a redesign of the slow-acting method of co~and decoding used in the

original system.

Consideration of the r.f. propagation loss over the telemetry

path from the stable platform to the receiving station at Osborne Head,

a distance of 28 km, revealed that a 0.25 \'!att VEF transmitter would give

adequate signal strength at the receiver (Jasik, 1961). The original system

used a 5 watt transmitter. The saving in battery current obtained by utili­

zing a low power transmitter significantly increased battery life.

In an effort to reduce the amount of heavY equipment on the platform,

6~~~' ... • °

0 •••

44° 30'

ASAMBRO ISLAND

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6~ 30'

STABLE PLATFORM LOCATION

-$-440 29' 26" N 630 23' 31" W

TRUE N

44°

PENNANT PT.

o

W~----~----~E

HALIFAX HARBOUR

ENTR ANCE

I I I 2 3 4 !5

NAUTIC AL MILES

FIGURE 1: Map of Halifax Harbour and Approaches showing the Stable Platform Location

S

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it was decided to enclose the tatteries in a pressure protected case which

would sit on the sea floor.

The following sections of this report deal with the design­

description, operat.ion, and maintenance of the system.

3. GENERAL DESCRIPTION

The Air-Sea 'l' .' lemetry S~!stem is comprised of two main sections, the

shore equipment or control station and the remote equipment or controlled

station.

3.1 Shore Equipment

The shore equipment less receiver is mounted in a standard

10 -inch rack (Fig. 2). A block diagram of the equipment is shown in

Figure 3. The command encoder, with a telephone-type dial, is coupled to

a L~F, FM transmittpr with its associated antenna. Emergency voice communi­

cat i on is possible over thp telemetry system using the microphone and speaker.

Telemetry signals, including commands regenerated by the remote equipment,

are sensed by the recei vinL; antenna and receiver. The AGC voltage fron the

receiver, which increases ree;ativel~· with increasing RF signal strength, is

used to control the d. c. power supply in the command readout un.i t so tha.t

the unit does not operate on receiver output-noise in the absence of a signal.

The receiver output, a frequency-division-multiplexed signal, operates the

command readout ur:it and is fed to the multiplex--reference combiner. The

combiner filters the receiver output to limit the noise bandwidth and adds

to it an internally generated 14.5 }:IIz signal prior to recording. The 14.5kHz

is utilized on playback to automatically reduce errors caused by stretching

of the t ape or u;'l changes in the tape transport speed.

'l'he c"n,1·j :t(~r outpu'c, is the input to channell of a two­

channel analog tape r ecorder. Channel 2 is used to make a voice record of

date, time. run number ancl pert :i. llent IJ1eteorolog i cal information at the time

of recording. The tape recorder inruts may be monitored prior to or during

recording, and the output:: nay be monitored durinlZ recording. \'lhen recording

is in progress, the outpu~ 3ignal from channell of the recorder is used to

drive the discriminators which demultipJex and demodulate the multiplexed

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aaaaa

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TAPE RECORDER

AUDIO PANEL

COMMAND READOUT UNIT

COMMAND ENCODER

PATCH PANEL AND BATTERY MONITOR

DISCRIMINATORS

MULTIPLEX-DATA / 14 K Hz COMBINER

UHF TRANSMITTER

FIGURE 2: Telemetry System, Shore Equipment

A

-

B

W RECEIVE ANTENNA

1

MIC c[)---j AMP

~

2

COMMANDO ENCODER •

MPX TONES

~- 3 4

W TRANSMIT ANTENNA

i 465.2MHi! COMMAND

TRANSMITTER

PLUS TELEMETRY 228.0MHi! MULTIPLEXEDI MULTIPLEX - 14.5~Hi! TAPE DISCRIMINATORS DEMOg~T~ATED BATTERY

TELEMETRY TONES I REFERENCE RE. RECORDER rr I RIG PATCH VOLTAGE RECEIVER COMBINER CHAN I CHANNELS PANEL INDICATOR

AGC I TO 13 VOLTAGE

COMMAND READOUT 1-1 --~

UNIT

r+-i CHAN 2

qr MICROPHONE

I-

CHART 1 RECORDER I

'A

I-

BEDFORD INSTITUTE I B HEADPHONES

I 2 -I 3

TITlE

DARTMOUTH NOVA SCOTIA

AIR SEA TELEMETRY SYSTEM

DRN. W.A. COLLINS I J:/r,::,... __ DATE 11/6171

DRAWING Nl! B -8-17-56

4

FIGURE 3: Telemetry System Shore Equipment Block Diagram

-.J

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information. Discriminator chaEnels 1 through 12 are data channels;

channel 13 is the 14.5 kHz reference channel. Channel numbering is in

accordance with the Inter-Range Illstrumentation Group (IRIG) format (Gruenberg,

1967); a listing of IRIG channels and frequencies is given in Table 1. The

resulting recording is compatible with the AID interface equipment at the

BIO computing centre where the recorded data may be automatically reduced

and processed (Thorburn and Dinn, 1971).

Discriminator outputs are fed to a patch panel where selected

channels may be connected to the chart recorder for monitoring. Battery

voltage is one of the parameters which is sensed at the remote site; this

information is transmitted to the shore station where it is displayed on a

meter which is part of the patch panel. Monitoring the battery voltage in

this manner gives an indication of when batteries should be changed.

3.2 Remote Eguipment

The remote equipnent electronics package (Figure 4) is housed

in a waterproof aluminum container 60 cm (24 inches) long and 28 cm

(11 inches) in diameter. Electrical connections to the equipment are made

via vlaterproof connectors (Electro Oceanics) which can be seen in Figure 4 surrounded by a protective ring. The equipment is normally mounted by two

wing brackets; however, for testing and troubleshooting with the cover

removed (Figure 5), the protective ring is used as a support.

A block diagram of the remote equipment is shown in Figure 6. Command signals are sensed by the co~mand receiver via a six-element yagi

antenna. The receiver output, which is a tune-burst signal, is detected and

used to operate relays in the control circuit making it possible to change

various parameters of the system.

The remote equipnent has two modes of operation, active

and standby, and ma.~; be placed in either mode with the proper commands. In

the standby mode only the rece~ .fer and the detectors are pmlered, .Thile in

the active mode aJl sub-units ir the remote equipment are operating. Battery

life is extended considerab~v by putting the system in standby when data

transmission is not required. Power is supplied by a 36 volt lead-acid

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rUBLE 1

IRIG Standard Frequencie s

j I Channel Lower Band Band Centre Upper Band !:::.f No. Edge Edge

I -Frequency· Period Frequency: Period Frequency Period liz

I Hz Hz Hz I llS llS llS I

400 i 430 I

~O 1 370 i 2702.7 12500.0 !2325.5 I

2 518 ' 1930·5 560 , 1785.7 602 i 1661.1 84 I I

3 675 1481.4 730 i 1369.9 785 I no ; 1273.9 I i i

4 888 !1126.1 960 \ 1041. 7 1,032 '968.99 14 ~ I I

1 83l.95 5 1,202 1,300 i 769.23 1,398 715.31 19E) i

6 1,572 ;636.13 1,700 :588.23 1,828 547.05 256 I I

7 2,127 ! 470.15 2,300 ; h34.78 2,473 404.37 346

8 2,775 /360.36- 3,000 I 333.33 I

3,225 ' 310.08 450

9 3,607 1277.2h 3,900 I

1256.41 4,193 238.49 586 i !

10 4,995 i 200.20 5,400 : 185.19 5,805 172.27 i 810 I I I

11 6,799 ! 147.08 7,350 i 136.05 7,901 126.57 : 1,102 ,

12 9,712 102.97 10,500 ! 95.238 11,288 88.590 11,576 I I I

13 13,412 74.560 14,500 ! f;S.966 15,588 64.152 I 2,176 ! I

14 20,350 I 49 .11~0 22,000 h5.455 23,650 42.283 I 3,300

15 27,750 136.036 30,000 133.333 32,250 31.008 4,500

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FIGURE 4: Telemetry System, Remote Equipment, Electronics Package

- 11 -

MODULATION CONTROL AMPLIFIER

veo's

THRUST ANEMOMETER

AMPLIFIERS

STEPPER SWITCH

MAIN REGULATORS

WAVE STAFF ELECTRON ICS

TEMPERATURE PROBE

ELECTRONICS

FIGURE 5: Telemetry System, Remote Equipment, Electronics Package, cover removed

F M TELEM ETRY TRANSMITTER

DC-DC CONVERTER

DECK 5

RELAY CONTROL

BOARD

RELAYS

DECK 4

DETECTORS

DECK 2

DECK 1

- 12 -

battery pack. The various other voltages required to operate the equipment

are derived from the battery voltage via the power regulation circuitry.

The command retransmit circuit and the battery voltage

vnitor are used to normalize the 27-volt command pulses and the variations

i~ batterJ voltage to a ±2.5-volt base as required by the voltage controlled

osci11ators (VCOs). In addition, the remote equipment contains matching units

_::.' ,,' :'gna1 conditioners for various external sensors. The thrust-anemometer

amplifiers accept low level signals (0 to ±200 mY) from the anemometer and

increase these signals to ±2.5 volts full scale. The gain and the offset

of the amplifiers may be varied in discrete steps by the control circuitry

~ n conjunction with commands from the shore equipment.

The variation in submerged length of a resistive wave staff

as a result of changes in ~ater level is convertei into a proportionately

varying voltage by the waVE staff electronics.

The tenpere.ture probe circuit produces an output voltage

which is a function of the resistance of a thermistor which is exposed to

the air. Commands from the shore equipment enable the mean temperature, or

fluctuations about the mean temperature, to be sensed.

COMmands from the shore equipment also enable the Aerovane

anemometer output to be scaled to suit the existing wind conditions via the

Aerovane anemometer control circuit.

The outputs from these various sLgnal conditioners and four

other external siEnals are each conn~cted via limiter circuits to the input

of individual voltage controlled oscillators (VCO) operating on IRIG pro­

portional-bandwidth channels. The limiter circuits prevent overdriving of

the '.'CO' s and thus eliminate breakthrou,;~ from one channel to another. ~he

current IRIG channel allocations are presented in Table 2.

Ir.tnediately after the stable platform ioTas installed, a three­

component accelerometer and four tensj on measurin[" devices were attached to

obtain engineering information on the platform's s t ability (Mills s 1972).

•

THRUST ANEMOMETER

COV(H CONTROL

THRUST ANEMOMETER

. r TO BATTERY

VOLTAGE MONITOR

RECEIVER

- 13 -

[§~:~~~VV} +15 V +6 V -15 V

- -20 V

OPEN/CL~~=O=U:T=P:U=T:::::::::::::::::::::::::::r ________ ~

{

:I ___ --I~-V-_l +15 V

+27 V + 15 V -15 V -20V

-15 V

OF~SET

CH ·12

CH II

CH 10

SWITCHED - ON IN "ACTIVE" MODE

EXTERNAL CONTROL

FOR TESTING

TEMPERATURE PROBE

EXTERNAL SIGNALS

RESISTANCE _ESTAFF

EXTERNAL MODULATION

FROM BATTERY

AEROVANE ANEMOMETER

{------1

r COSINE

~ __ ~S~IN~E~ ______ ~

FIGURE 6:

+25.5 V

LIMITER CIRCUITS VOLTAGE

CONTROLLED OSCILLATORS

Telemetry System, Remote Equipment Block Diagram

- 14 -

Under shore command d.c. reference voltages m~y be substituted

in place of the outputs of the limiters to calibrate the VCO. The VCOs

are designed such that their outputs can be multiplexed simply by connecting

them together. The resulting multiplexed signal is fed via the modulation

control amplifier to the VHF telemet:r;r transmitter.

TABLE 2

IRIG Channel Allocations

Channel 1 Aerovane Sine Signal

2 Aerovane Cosine Signal

3 Battery Voltage

4 vTave Height Signal

5 Tension, Mooring Cable #1

6 Tension, Mooring Cable #2

7 Tension, Mooring Cable #3

8 Tension, Mooring Cable #4

9 Air Temperature

10 Thrust Anemometer Component 1/ Accelerometer Component 1

11 Thrust Anemometer Component 2/ Accelerometer Component 2

12 Thrust Anemometer Component 3/ Accelerometer Component 3

14 Command Retransmit

4. DETAILED DESCRIPTION OF REMOTE EQUIPJTNT

4.1 Battery Power

In normal use, power is supplied to the telemetry system by

a bank of nine l2-volt, 90-ampere-hour, lead-acid storaf,e batteries connected

in a series-parallel arrangement to provide 3C volts with a 270 ampere-hour

capacity. The batteries are contained in a pressure-proof steel box measur­

ing approximately 99 x 72 x 28 cm (3) x 28.5 x 11 inches) which is capable

of withstanding water pressures at ~ depth greater than 98 metres (300 feet).

- 15 -

When fully loaded with batteries the box weighs approximately 300 kg

(660 pounds).

The battery box rests on the sea floor. A four-conductor

(each #12 AWG) electrical cable, connected to the box via a submersible

connector carries power to the surface where battery voltage is available

on two independent pairs of wire. High-current circuits, such as motors,

and low'-current, sensitive, electronic circuits are each operated by separate

pairs, thus avoiding difficulties caused by a common cable impedance.

When the battery is fully charged and is disconnected from

the charging circuit, the battery voltage settles to approximately 39 volts.

For practical purposes, the ene-of-discharge voltage vihile supplying 1 ampere

was determined from tests to be nominally 31.0 volts. Cable losses (1 volt

in this case), reverse-polarity-protection diode losses (1 volt) and regulator

losses (1 to 2 volts) limit the maximum regulated voltage which can be derived

from the battery to approximately 27 volts. This voltage permits the use

of many commercially available electronic subassemblies reQuiring a 28-volt

±10% supply voltage, hence the choice of a 36-volt power source.

4.2 Main Voltage Regulators

Each of the tYro pairs of wires from tpe battery is connected

in the electronics package to inaepcndent +27-volt regulators which are

mounteu on Deck 3 (Fig. 5). The regulator schematic is presented in

Figure 7. Regulator B serves the thrust anemometer cover motor (section 4.6);

while reiSUlator A serves the remainder of the telemetry system. Both regu­

lators have a series input diode to protect the system from application of

the incorrect battery polarity. In aGdition, an automatic 3 ampere current

limit control has been incorporated in each regulator. The nominal load-current

rating of the regulators is 2 amperes. Referring to regulator A the voltage

at Q6 base is nominally 29 volts set by D7 and D8. Transistors Q6 and Q7 form

a compound-follower circuit w~ich drives a simple eTIitter-follower po#er-

output stage. ApproxilJ'ate l y 1. 5 to 2 volts is lost in these follmTers

resulting in an output voltage of approximately 27 volts.

1 2

DI 20C8(1 R l

04 EXTERNAL

+36V INPUT ( 2N3716/ TO BOARD FROM BATTERY 0 ~ " r - - -, (ALSO 08) , ~+27V OUTPUT

3 4

- 17 -

Resistor R10 is a current-sensing resistor. If the load

1.ere such that it required more tr..an 3 amperes, the voltage drop across R10

would cause Q5 to conduct such that the voltage at Q6 base would drop to a

value sufficient to limit the current to 3 amperes.

4.3 Battery Voltage 110nitor

As indica.ted in S~ction 4.1, the battery voltage is a

reasonable indicator of the relative operating capacity remaining in the

batteries and for this reason is monitored and the result is telemetered to

the shore station. The voltage which is actually sensed is that at the input

of main regulator A (Figure 7). A voltage drop of approximately one volt

occurs in the battery cables, thus when the voltage being sensed falls to

30 volts the battery has reached the end of its useful life.

The battery voltage monitor produces an output between -2.5

and +2.5 volts for an input between +28 and +38 volts. The schematic is

shown as part of Figure 8 and consists of Ql, D2, R4, R5, R6, R9 and R15.

Pin 3 of the schematic carries the representative battery voltage from which

33 volts is subtracted by Ql. Transistor Ql is connected as a current

source, drawing just under 1 rnA through Rh and returning it to the -15 volt

supply. With 28 volts between pins 3 and 7 of the circuit, R6 is adjusted

so that -2. 5 volts is obtained at pin 5. Resistor R9 and the input impedance

of a VCO connected to pin 5 attenuate the nominal 10-volt change in input

vol tage to a 5-vol t change centered about zero.

'The batter! monitor is mounted on a printed circuit boa.rd

on Deck 4 of the electroni cs pe.ckage.

4.4 Low-Current Voltage Regulators

Supply voltages of +25.5 volts, +15.0 volts and +6.0 volts

are derived from separate voltage regulators (Figure 9) operating directly

from the 27-volt output of main regulator A. A dc-dc converter producing

-20 volts is used in conjunction with another regulator to provide -15.0 volts.

All of these components are mouni ed on Decl: 6 of the remote equipment

(Figure 5).

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- 19 -

Operation of the -15 volt, +15 volt and 6 volt regulators is

basically identical. For the +15 volt regulator, D5 and D6, fed by constant

current diode D7, provide a reference voltage of nominally 6.6 volts.

Transistors Q7 and Q8 form a voltage comparator; Q9 and Q10 are connected

in a compound follower circuit; D8 allows the use of a higher collector feed

resistor for Q7 resulting in higher gain and improved regulation. An increase

in load current tends to cause a decrease in output voltage and in the volt­

age at Q8 base. As a result Q7 conducts an increased amount of current which

increases the collector current of Q9, which in turn provides an increase

in emitter current of Q10 sufficient to meet the new load demand.

A protective current-limiting feature is provided by Q7 and

Rll. lfuen the load is such that a current of more than 0.35 ampere is

demanded, the voltage drop across Rll is sufficient to cause Q7 to conduct,

providing a bypass for the current that normally flows from Q9 base. IE th

the base current of Q9 lim:~ ted, the load current is also limited.

The -15 volt and +15 volt regulators differ only in the

polarity of the semiconductors. The reference voltage for the 6 volt regu­

lator is derived from +15.0 volts via R24 and R25, and current from this

regulator is limited to.0.25 ampere.

The 25.5 volt regulator is similar to the other three with

the exception of its output stage. Transistor Q19, in Figure 9, is an

emitter-follower operating from the output of the voltage comparator and

feeding a collector-output, series-pass transistor which produces a regulated

output with as little as 0.2 volts emitter-collector operating voltage.

When the voltage drop across R32 under normal operation (200 mV) is considered

as well, it is evident that output of the regulator will be maintained at

25.5 volts for input voltages as low as 26.0 volts. If the compound follower

output stage were employed here, as in the three other regulators, a minimum

input voltage of 26.8 volts would be required to maintain a regulated output.

Since the 27 volt input may vary by as much as ±l volt the collector-output

arrangement is the only suitable one.

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4.5 Thrust Anemometer Amplifiers

The ~( VI three-component thrust anemometer being used in

the Bedford Institute's air-sea interaction program resolves the displacement,

caused by wind drag, of a perforated sphere 3.8 cm (1.5 inches) in diameter,

into three orthogonal components (Smith, 1969). Three linear voltage­

displacement transducers (LVDTs) within the anemometer produce output voltages

proportional to displacement for each of the three components. At wind speeds

approaching 40 metres per second (78 kt), the nominal upper measurement limit

of the thrust anemometer, the output voltage of either horizontal component

when aligned with the wind direction is approximately 200 mY. The vertical

wind component drag force typically varies between zero and one-fifth of the

horizontal components, thus producing an output between zero and 40 mY. The

thrust anemometer amplifiers (Figure 10) are required to bring these low level

signals up to 2.5 volts full scale, and to compensate for long-term and

temperature-induced drifts in the anemometer outputs. The amplifiers are

contained on a single printed. circuit board which is mounted on Deck 5 (Figure 5).

In order to ensure good resolution over the range of wind

speeds from 0 to 40 metres per second, four discrete gain settings are pro­

vided by the amplifiers. ~he gain of all three amplifiers is changed with

a single command. The gain of the two horizontal-component amplifiers is

selectable at 12.5, 25, 50 or 100, while that of the vertical-component

amplifier is selectable at 62.5, 125, 250 or 500. The increased vertical

sensitivity is necessary because the vertical component of the wind force is

generally smaller than either horizontal component.

The three outputs of the anemometer at zero-wind conditions

should ideally be zero but because of mechanical shock during installation,

temperature changes and long-term drift the outputs may fall anYVlhere

between 0 and ±15 mY. Offset voltages may be applied to the amplifier inputs

to ensure that the amplifier outputs will be close to zero at zero wind

conditions. Four positive offsets, four negative offsets (±1.67, ±3.33,

±5.00, ±6.67 volts) and a zero offset are available and may be chosen

independently for each amplifier.

- 22 -

\-lith reference to Figure 1.0, Al is an operational amplifier

used in a non-inverting, follower-vli th-gain configuration. The gain is set

by R5 and R8 and is nominally 108. The effect of the offset input resistors

Rl, R2, R3 and R7 on the gain is negligible.

The LVDTs in the thrust anemometer have a typical output

resistance of 1300 ohms. The anemometer output, which is isolated, appears

across 5P3-14 and 5P3-13 (Figure 10). The low side of the output connects

to 0 volts via R18. By adjusting R20 the residual output voltage of the

anemometer may be nulled out. The output resistance of the anemometer and

Rll through R17 form an input attenuator. Gain commands from the shore

station effectively connect 5P3-8 to one of 5P3-9, -10, -11, or -12, giving

nominal voltage gains of 100, 50, 25 or 12.5 respectively. The reduction

of the maximum gain from 108 to 100 is a result of the loading effect of the

attenuator in conjunction vli th the thrust anemometer output resistance.

Constant source impedance is seen by pin 3 of the operational amplifier and

is maintained by R15, R16, and R17. Undesired changes in amplifier output

voltage resulting from changes in the input bias current of the operational

amplifier are thus minimized.

Offset commands from shore result in +15 volts or -15 volts

being applied to 5P3-4, -5, -6, or -7. The only exception occurs at zero

offset when 5P3-5 is taken to 0 volts. Because the offset input voltage is

applied to the inverting input of the operational amplifier, a positive

voltage must be used to produce a negative shift in the amplifier output.

The choice of offset resistors controls the gain of the circuit with regard

to the offset voltage. For example, to obtain +5.00 volts offset, -15.0 volts

is applied to the amplifier via R7 and Rl vlhich totals 301 k~L Since the

feedback resistor is 100 krl the circuit gain is -1/3 and a shift of +5 .00vol ts

occurs at the output.

Resistor R4 is used to limit the amplifier output current in

the event that the amplifier is overdriven. RIO is used to set the amplifier

output to 0 volts after R20 has been adjusted and zero offset has been

selected.

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- 24 -

Note that .A.MP 2 schematic is identical to that of AMP l.

However, in AMP 3, the value of R48 is 187 ohms, giving an amplifier gain

of 535. When the loading effect of the attenuator is accounted for the

maximum gain available is 500.

4.6 Thrust Anemometer Cover

Because of long-term drift, temperature-induced drift and

tilt of the tower structure, the thrust anemometer outputs at zero wind

conditions cannot be relied on to be precisely repeatable. Since the

absolute wind velocity is an important parameter, a means of monitoring the

anemometer outputs at zero wind is required. To this end a method of simu­

lating zero wind conditions by completely covering the anemometer was devised.

The anemometer cover (Figure 11) was produced by Nova Scotia

Research Foundation (Taiani, 1970). It consists of two concentric, fibreglass­

reinforced-plastic cylinders; the inner one (10 cm diameter x 100 cm long)

is normally flange-mounted rigidly to a supporting structure, and the outer

cylinder (15 cm diameter x 92 cm long) is carried up or down by a motor­

actuated lead-screw. The motor is contained within the inner cylinder near

the bottom. The anemometer is normally mounted in the upper end of the inner

cylinder. The outer cylinder has a top cap containing a central hole approxi­

mately 5 cm in diameter through which the upper portion of the anemometer pro­

trudes when the cover is open (outer cylinder down). ~~en the cover is closed,

the outer cylinder is up and effectively shrouds the anemometer from the "rind.

The hole in the top cap is closed off by two overlapping shutter-leaves which

operate as the top of the outer cylinder clears the anemometer.

A wiring diagram of the anemometer cover is shown in

Figure 12. A 5-pin connector, J3, in the base of the cover assembly couples

power from the electronics package to the cover motor. When the anemometer

is to be exposed, a command from the shore staU.on applies +27 volts between

pins E and A of the connector. Motor current is typically 1.5 amperes

starting, 0.3 amperes running. The Irotor operates turning the lead scre"r

which carries the outer cylinder dmm. At the end of its travel the limit

switch is tripped thus interrupting power to the motor. The motor may now

- 25 -

FIGURE 11: Thrust Anemometer Cover

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FIGURE 12: Thrust Anemometer Cover Wiring Diagram

A

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- 27 -

be operated only by applying +27 volts between pins D and A which serves to

close the cover. The limit switch mechanism is designed so that the switch

will trip when the outer cylinder reaches the end of its travel in either

direction or when the motion of the cylinder is sufficiently impeded, e.g.,

by icing. Thus, the motor cannot remain in a stalled or high-load condition.

In addition to J3, the base of the cover assembly contains

a 19-pin connector, Jl, and 6-pin connector, J2, used to carry anemometer

signals and a thermistor signal respectively. The anemometer itself is

connected to Jl via Pl and a short length of cable within the inner cylinder

of the cover assembly.

During the 1970 field season wires from a thermistor were

routed through the anemometer case to its output connector. From there the

signal was available on J2,

4.7 Wave MeasUl'ing Circuitry

4.7.1 Wavestaff

Waves are measured by means of a 12.2 metre (40-feet)

resistance type wavestaff produced by Nova Scotia Research Foundation (Taiani,

1971). The staff is made of flexible nylon tUbing with a spiral groove in

which nichrome wire is wound (Figure 13). The wire size is such that the

total resistance of the staff is approximately 465 ohms. The wavestaff may

be coiled to a 1.2-metre (4-feet) diameter for ease of transport. In use,

the staff is supported vertically on the stable platform by a taut steel

cable through the centre of the tube. At the top of the staff there is a

two-contact waterproof connector. The resistance of the staff as measured

across these contacts is, by virtue of the conductivity of the sea water,

proportional to the amount of the staff which is out of the water and hence

is related directly to wave height.

Wavestaff ~lectronics Board

The wavestaff is excited by a 1.5 kHz, 5 rnA peak

alternating-current from the wavestaff electronics circuit. Since the current

is fixed, the voltage across the staff is a function of resistance only.

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The a.c. staff voltage is converted to a proportional d.c. voltage by the

wavestaff electronics circuit, the output of which may be adjusted to pro­

duce a to +5.0 volts corresponding to a rise in water level of 12.2 metres.

The wavestaff electronics board (Figure 14) is

mounted on Deck 3 of the remote equipment (Figure 5). The schematic may be

considered in four separate functional blocks. The first is a standard

astable multivibrator or square wave oscillator, comprised of rCl and asso­

ciated components, producing a 23-volt peak-to-peak output at 1.5 kHz.

The second block is a voltage-to-current converter

consisting of a diode bridge (Dl through D4) and components shown within

the bridge. Whenever the diode bridge is biased positively or negatively

by more than 4 volts on its lateral corners, Ql functions as a current source,

passing current from the top corner to the bottom corner of the bridge. The

current may be adjusted between 3 rnA and 8 rnA by means of R8 to accommodate

wavestaffs with resistances between 800 ohms and 300 ohms, respectively.

Capacitors C5 and c6 block direct current, thus the current produced by QI is

seen by the wavestaff as an alternating current. During the positive half­

cycle, current flows from rCI via Dl, Ql, D4, C5 and c6 into the wavestaff,

while during the negative half-cycle the flow is from the wavestaff via C5,

c6, D2, Ql, D3 and into rCI.

The third block is the detector which produces a

d.c. voltage from the a.c. voltage across the combined resistance of the

wavestaff and RIO. Variable resistor RIO functions as an offset control to

permit setting the output voltage so that a volts output corresponds to a

water level just at the bottom of the staff. The actual detector is a

negative-output, voltage-doubler consisting of C7, DIO, Dl3 and a filter

network C8, R13 and C9. The clamping voltage for the doubler is +7.3 volts

produced by Dl4 and D15. As the input voltage to C7 is increased, the

detector output voltage will decrease from +7.3 volts to zero. A rising

water level produces a decrease in staff resistance which causes a decrease

in voltage across the staff and thus an output voltage which increases

positively. Hence the output voltage of the circuit is in the same sense

as the wave being measured.

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3. "'LL P'Ol,..,RI'Z.ED C,...,PACITORS ~e. DJ?'( T,lttrNTA.LUH T"(~~·ILT.:Ipe.,..J liEiSAIfi">iNSffTUTE ==1 4

A

B

c

5 ..... LL PoTENT\OMe.TER~ ARE OOUR:N~ ~'2."'O H. .... IR SEI'. INTERI'Cr\ON I 0 TP ~ .. 7·3 "Ol....,.~ O.C

TP 4- - 2.0 'VOl.:T''S D . C. :t::/'t

2

FIGURE 14: Remote Equipment:

3

TE.L.EMETR,( S'(STEM SCHEMI'.-nC. ",,"'VE "' ..... FF ElECTRONICS

-. .; ... .. ; .... i ___ ._ NO",,"

1Il1l: 2& A.PRIL ~~"70 I )~ __ •• C-B-I7- 47

4

Schematic, Wave-Staff Electronics Board

LV o

- 31 -

The output is buffered by emitter-follower Q2,

which, in this application, requires a negative supply in order to remain

linear for output voltages near zero. The final functional block is used to

produce -20 volts for this purpose by feeding the output of the multi vibrator

to a voltage doubler circuit comprised of DB, D9 and associated components.

Wave Height Signal Amplifier

The wave height signal amplifier is a unity-gain,

non-inverting amplifier used to buffer the output of the wavestaff electronics

board and to shift the signal from the a to 5 volt range to a -2.5 to +2.5 volt

range as required by the veo input. The amplifier circuit (Figure 15) con­

sists of ICl and associated components. Resistors R10 and R12 form a voltage

divider providing +2.5 volts to the inverting input of the amplifier, thus

subtracting 2.5 volts from the input signal. Resistor RB is used to limit

the maximum current that can be drawn from the amplifier under fault conditions.

4.B Aerovane Anemometer

4.B.l Modifications to the Aerovane

The standard Aerovane anemometer (Bendix Corp.,

Friez Instrument Division, Model 120) registers horizontal wind speed V a

and direction e in cylindrical coordinates. A propeller-driven magneto a

generates a voltage proportional to wind speed, and the directional signal

is generated by a synchro transmitter which requires more 115-volt, 60-hertz

power than can conveniently be supplied at the remote site. The Aerovane

was therefore modified to register in two Cartesian coordinates by replacing

the directional synchro with a precision sine-cosine potentiometer (Figure 16).

The voltage from the Aerovane magneto, representing total wind speed, is split

by a voltage divider, Rl and R2, and applied to the potentiometer so that the

voltages at the cosine and sine terminals are proportional respectively to

the south-to-north wind component, VI = V cos e , and the east-to-west a a

component, V2

= V sin 8 . a a The spee~-indicating magneto remains loaded by

the recommend~d impedance of 1150 ohms, as it was before modification, so

that the manufacturer's calibration remains valid. The modified Aerovane

sensor is wind-powered and does not require a separate electrical supply.

A

-

B

-

c

-

D

~

., I'" 47 ~bK

.,.~ ~X .r.

.. " 'o~

t-%'I FROM !!Urrr..TT j ' I

1 2

i--I -I +'5- --,

R" ,0"

"'0 50\· 11<

",., '00"

", .. "'7:Z~ ~~ ... lew

". I ,I,!,

I 3

~ ~~ 107 ... r: .~ ,.., 'ill

." .,. Z:r 1;'

, 1 ! 11!1!1

I 4

A

r- B ~i.

R " ~ Rtl .. " ~ R2/O "0'- ''!' ... 11t!\ !II" .'" < . "

0" 0:."1. l- f--< .... 10,

.,. R:t7 '00 '00 ~ ~

I-

11 1 ! ! ! 1 ! b i ! Z ~~ ...... ~'( 3

)1,1,1 ,,1,,1 LJ

I 177 e~ I I t ~ ,4 I~ ." 17 I ~ ,~ to :1 :::: ,~ Z4Z!> '2" " te Z~ ~ ~I ?,'Z !~ !!4-L ______________ l

c NOTt!.~ .

, Ut..lLESS O"HE.~"""~E NOTED .... LL ~E~I~"OR~

A..RE 1 .. "" .'"1. 'Z .... LL POTEN"\OME,~R~ A.RE BOURN~ ~'2.E.O H .

~ E"Qulv ..... I-EWT R~'SoI~T ........ C~ OF R'ZI .. R: 22. ~ I', K B , ... '-10 ~;; -='!l~~~:_, .,;~~~'~~o:.:.'~iiI-

FIGURE 15:

2 3

'" ",R

~L , "0

~\ w .... ~ !.(.\(,,".4 ·J.~ '::l.3.2.w

~I_ Rle ""'E"f: 200~ ­",."7 "',., .... ERE 2· "'" K

RS ......... ~ "" w ,".

B£DFORD INsmuTE DAImIOUTII --- NOyA. scanA

mu A.I~· SEA. INTERf.:Ir...CTION

TELE~ET~~ 5~5TEM

~C.HEM.A.:T\C . DECK 4 COMPOt..ie: ...... --::

a... ~-.-. I L '" ~ --~.

M~ 2 ,..,-.,qc ... '')7-, ~

OM""'"' C-B-I,-4-3

4

Remote Equipment: Schematic, Wave Height Signal Amplifier (enclosed by broken line)

~

D

LU I\)

- 33 -

4.8.2 Aerovane Control Circuit

The sine and cosine output voltages are connected

to the anemometer control circuit in the electronics package via a three­

conductor cable (Figure 16). Relay Kl is shown in the closed position which

is its normal state when wind speed and direction are being monitored. To

simUlate zero wind conditions, which in the case of the Aerovane means zero

output voltage, Kl is placed in the open position by a command from the shore

station. The voltage applied to the VCO inputs is then zero.

With Kl closed, the sine and cosine voltages are

connected to voltage dividers comprised of R3 through R6. Under remote control

K2 may be set in the position shown in Figure 16 whereby the full output

voltage of the anemometer is applied to the VCOs. This condition corresponds

to a full scale wind speed of 21.3 metres per second (41.3 kt). When K2

is set in the opposite sense, the anemometer output voltages are scaled by

1/2 before being applied to the VCOs. (Note that the parallel equivalent

of 116 kn and 750 kn is 100 kn.) Thus, a full scale range of 42.6 metres per

second (83.6 kt) is achieved. The voltage divider resistors are mounted on

a printed circuit board on Deck 4 of the electronics package and are labeled

R22 through R27 in Figure 15.

4.9 Temperature Measurement

A wind turbulence thermometer, compatible with the telemetry

system, was developed for air-sea interaction studies by the electronics

design group of the Metrology division at Bedford Institute of Oceanography

(Bendell, 1970). ~he basic requirement for a temperature measuring unit

capable of measuring rapid (10 Hz), minute (O.OlOC) temperature fluctuations

of the air near the sea. surface was met using a microbead thermistor manu­

factured by Victory Engineering Corp. (Veco # E41A401C)" in conjunction with

a stable, bridge-amplifier. The thermometer is intended for use in the tem­

perature range -20°C to +30 oC. To obtain the high resolution required a

method vIas devised to centre a ±2. 5°C measurement range on the mean temperature.

In operation the thermistor is mounted on the case of the

thrust anemometer and is protected by the anemometer cover when the cover

A

8

AEROVANE MAGNETO o TO + 10 VOLTS

SONEX TYPE

TEX -3005 BR

VCO

750K Rin

2

0- 5 VOLTS

J= RI 750 Il

EQUIVALENT OUTPUT LOAO

1150 n

1°'.

L:R2

750 Il 1"1.

~o-ll>-~~ ..... /\ l>-~ ~~~"'/..... \

..... "'" \ // \

( \ \ \ \ \

VCO

750K Rin

\ \

\

2

R4 116 K 1-'0

120· o VOLTS

0-5 VOLTS

o VOLTS

3

O·

SINE - COSINE

POTENTIOMETER

( C.I.C. NO 448532) TYPE 206

o VOLTS

4

C r-} CONNECTOR

CABLE

2" CONNECTOR

ZERO WIND SIMULATOR RELAY

3

BEDFORD INSTITUTE DARTMOUTH NOVA SCOTIA

TITLE

AEROVANE ANEMOMETER CONTROL CIRCUIT

DRN. ART COSGROVE I ENG. J.) 1'- ~._

DATE 26-9-71

DRAWING NQ 8- 8-17 - 59

4

FIGURE 16: Control Circuit for Modified Aepovane Anemometer

A

8

w +:-

- 35 -

is closed for a zero wind measurement. During this time a servo amplifier

in the air temperature electronics nulls the output of the thermistor bridge­

amplifier. The voltage required to produce a null is a measure of the average

temperature. The circuit (Figure 17) is calibrated to produce -2.5 volts cor­

responding to -20°C and +2.5 volts for +30 oC. When the thermistor is exposed,

the servo function is inhibited. The output voltage of the circuit under this

condition is a measure of the temperature fluctuations, where the output

voltage of ±2.5 volts corresponds to nominally ±2.5°C. In either mode, the

relationship between temperature and output voltage is not linear, since the

thermistor used is a nonlinear device. To obtain precise temperature infor­

mation the equation relating temperature and output voltage for the particular

thermistor must be considered (Bendell, 1970).

4.10 External Signals

As indicated in Figure 6, IRIG telemetry channels 5, 6, 7

and 8 are used to carry information derived from four unspecified external

sensors. The sensors may be of any type, but each must supply an output

voltage between +2.50 volts and -2.50 volts. A limited amount of power is

available from the electronics package to operate the sensors and any condi­

tioning circuitry required to produce the necessary output voltage.

During the 1970 field season, signals derived from four

strain-gauge instrumented turnbuckles, one in each of the main mooring cables

of the stable platform, were telemetered to the shore station. Signal condi­

tioners associated with each turnbuckle produced an output of -2.50 volts for

zero cable tension increasing to +2.50 volts for 20,000 Ib tension. It was

necessary that simultaneous measurement be made of the tension in each of the

main mooring cables to permit an assessment of the total loading on the

structure (Mills, 1972).

4.11 veo Input Limiting

Although the normal full scale output voltage of all the

sensor amplifiers and conditioning circuits is ±2.5 volts, many are capable

of producing output voltages as high as ±13 volts when overdriven or when a

failure occurs. If a voltage of this magnitude were applied to the input

16.2K .05%

100n~

400n 05%

OV

-15V

383n

+15V

-15V

12 K

+15V

-15V

nE41A401C)

THERMISTOR .---

25K .05%

80K .05%

80K .05%

OV 500K .05%

100pF

500 K

.05%

+15V

4.99K

OV

IK

150K

.02 fLF

+15V

10 K

1%

9.09K 1%

OV

IN4447(2)

IK

RESISTORS 5 % UNLESS MARKED

100 pF

100 K

+15V

-15V

+27V

-20V

470 n

500 fLH

I·lfLF

OV

t"T

T

70t"T

5

I I

16?:

L 15

MOTOR

OV(P)

FIGURE 17( a) : Remote Equipment: Schematic Temperature Probe Circuit

JI-7

JI-12 JI-II

+15V

-15V

OV (POWER)

+27V

-20V'

OV (SIGNAL)

TEMP OIP

THERMISTOR

SHIELD

t"T COMMAND

T COMMAND

2 JI

2

3

4

5

6

7

8

9

10

II

12

LA)

0\

I

r--

I" RED

"' +15V

2 " YELLOW

" -15V

OV (POWER) 3 "'

D. BROWN

+ 27V 4 GREEN

-20V 5 " ORANGE

OV (SIGNAL) 6 " L.BROWN

TEMP OIP 7 " VIOLET

,.... B " [ 1 9 /

"' !a,

THERMISTOR

SHIELD 10~ -t.T COMMAND II"

f COMMAND 12 "

-JI VON :5P

POTENTIOMETER -MOTOR

;: ;: +1--

..... u u u U II>

~ L-

REDI WHITE

ORANGE I WHITE

;: ;: > > II> I ..... ::!; ::!; I u u o t- O U N N U

I + Ir W ~ ;:

-15V 0 Cl.

+15V P .C. BOARD (DWG . B - D-56-IA) SIG.COM .

0 ..J

THERMISTOR w :r --- II>

~

FIGURE 17(b): Remote Equipment: Schematic Deck 2

15 __ I-

it I I

6 J.!~ I

~+7 I I I I

L, I I 1

~:

1\ T

RLI SIEMENS V23003(OR 7)-

B0037- BIIO

w -.;j

- 38 -

of a VCO, it would be overdriven and its output frequency might fall within

an adjacent channel allocation thus causing interference and making the

adjacent channel useless for data transmission.

To avoid this interference problem a set of 13 limiters

(Figure 18), one for each VCO, is used to ensure that the veos are not sub­

jected to input signals larger than ±4.2 volts, a value below which channel

overlapping does not occur. Zener diodes Dl and D2 are connected to produce

approximately -3.5 volts and +3.5 volts, respectively. Terminals 1 through

13 (14 is spare) are connected to the inputs of their respective VCOs, which

are connected in turn to the outputs of the assigned sensor amplifiers and

conditioners. If the voltage on terminal 1, for example, tends to exceed

+3.5 volts, D4 conducts, and in conjunction with D2 prevents the voltage

from increasing beyond +4.2 volts. Should the voltage on terminal 1 tend to

exceed 3.5 volts negative, D3 conducts and, with Dl, limits the voltage to

-4.2 volts. Current from the sensor amplifier is limited at the amplifier

to less than 20 rnA.

It should be noted that when the input voltage applied to

a limiter is within the range of ±3.5 volts, the limiter has no loading

effect on the input since D3 and D4, for example, are both reverse-biased

for this particular input condition.

4.12 Voltage-Controlled-Oscillators

A voltage-controlled-oscillator (veo) is an oscillator whose

output frequency is determined by the amplitude of a control voltage input.

Generally a linear relationship exists between the output frequency and the

input voltage. Thus a VCO is a linear frequency modulator. Changes in the

input voltage are encoded as changes in the output frequency. Signals from

many sensors may be frequency-division-multiplexed by using different centre

frequencies.

The 13 Sonex type 3005/BR VCOs in the remote equipment

(Figures 5 and 6), operating on IRIG proportional-bandwidth channels 1

2 3 4 ,

-20 Volts 0

A >R2 5.6K l.W 4 -3,5 V

,~ " ,

" " " , ,r ,

" " V , " " DI D3 D5 D7 D9 DII DI3 DI5 DI7 DI9 D21 D23 D25 D27 D29

IN747A

r, .-- - ~ - f-- - - - - - - - - -, "

, ,r " " ,r ,r ,r , ,

" " " " ~2 04 D6 D8 010 DI2 DI4 DI6 DI8 D20 D22 D24 D26 D28 D30 1N747A

+3.5 V

~~~8K ( ( ( ( (

..LW I 2 3 4 5 6 7 8 9 10 II 12 13 14 4

D3 - D30 ARE IN4447

)

+ 27 Volts

8 BEDFORD INSTITUTE

DARTMOUTH NOVA SCOTIA

lTTLE

SCHEMATIC VCO INPUT LIMITERS

DRN. ART COSGROVE I ENG. IJ 7-;~ DATE 23-9-71 I DRAWING N2 8-8-17-51

2 3 4

FIGURE 18: Remote Equipment: Schematic, veo Input Limiters

A

8

W \0

- 40 -

through 12 and channel 14, contain an internal relay which allows the

control circuitry (tigure 6) to apply d.c. calibration voltages to the VCO

inputs. The full-scale frequency deviation is ±7.5% of the centre frequency

for each channel ~Table 1). Any 5-volt input range between -5 volts and

+5 volts may be Jsed to produce this deviation. External adjustments are

provided so thrt/lthe deviation sensi ti vi ty and the centre frequency may be

preset to desir~ld values. Input resistance is nominally 750 krl, and power

consumption is /9 mA at 28 volts d. c.

I ' Linearity of the voltage-to-frequency characteristic is ,

generally exp~essed as the percentage departure of the actual transfer charac-

teristic from/the best straight line approximation to the characteristic. For

the TEX-3005/BR the linear:..ty is specified as ±0.25%.

The output network of the VCO may be considered as a voltage

source externally adjustabJe from zero to 3.5 volts rms in series with a

resistance of 47 krl. The recommended load is 8 krl, but values much lower or

higher than this may be used. In the electronics package the outputs of the

13 VCOs are connected together to combine or multiplex the 13 signals onto

one line. Thus the load on anyone VCO is the parallel equivalent of the

output resistances of the other twelve or approximately 4 krl. The maximum

contribution to the output voltage by anyone VCO is 0.27 volts rms.

4.13 Modulation Control Amplifier

The modulation control amplifier (Fig. 5 and 6) is a variable

gain buffer amplifier which enables the amplitude of the modulation input

voltage to the telemetry transmitter to be set with one adjustment instead

of by individual adjustment of the 13 VCO output levels. The modulation

input amplitude controls the deviation of the transmitter output frequency.

'The amplifier is a Teledynamics Model 119lD wide-band ampli­

fier. The amplifier has input and output impedance of 100 krl and 50 rl

respectively. The voltage gain is continuously adjustable from 1 to 20 by

means of an external control.

- 41 -

4.14 Telemetry Transmitter

A Nautel Model CDI02 VHF, FM telemetry transmitter (Nautical

Electronics Laboratories Ltd., 1970) operating at 228.0 MHz is used (Figures 5

and 6). The transmitter requires 90 mA from a 27-volt supply, produces typi­

cally 0.3 watt rms power into a 50 0 resistive load, and is protected from

damage for all loads from open circuit to short circuit, i.e., any VSWR.

Input impedance at the modulation port is nominally 20 kO and the modulation

sensitivity is 140 kHz per volt. Modulation frequencies between 300 Hz and

30 kHz are accepted provided the maximum deviation is limited to 120 kHz.

The transmitter output is fed to the antenna via RG-8 50 coaxial cable.

The transmitter is mounted on Deck 6 of the remote equipment.

4.15 Interwiring on Deck 6 of the Electronics Package

The limiter circuits, VCOs, modulation amplifier, and tele­

metry transmitter discussed above are shown interconnected in Figure 19, which

also shows the dc/dc converter and voltage regulators discussed in section 4.4.

The chassis of Deck 6 is used as the primary ground reference for the system.

In general, all ground or zero-volt wires from the other decks and circuits

in the electronics package use Deck 6 as a common zero-volt point. This

procedure minimizes interaction between circuits resulting from common

impedances in the power and signal return lines.

4.16 Antennas

The receiving and transmitting antennas used with the remote

equipment are both six-element yagis with a directional gain of 9 dB and a

nominal impedance of 50 ohms. The receiving antenna is a Sinclair type 307,

the transmitting antenna, type 206-EB (Sinclair Radio Laboratories, 1969).

The antennas are mounted on the instrument mast in a manner which allows

them to be easily directed at the shore station.

In the 1970 field season the antennas were employed in the

vertically polarized mode. There is, however, evidence which indicates that

improved signal-to-noise ratio may be achieved using horizontal polarization

because much man-made eJectrical noise tends to be polarized more strongly

A ~J>

""""NO" Da·I..~

z

~ I j j i i ~ i j i ~ .1 ... I.! 1"1~1''''iI.;;P t:S~'~z~~~'~!~ ~.6,~(~.~ol·

~~v=~~~9 ~~~~g JI,~>~~~gt ~o~~~oio~o~o~o~o~o!o~o~o8

ii;;iiiiiiiiiifttiiiiiiiiJ

3

II II II II :7Iflrlllrlrlll[I[lm~~f:I~~~~ I~ '-.J!o "oJ.- ~.Jl "J& .. ..I~ 6.,.110 Eo';11 ",.lIt ~ II = II ~~ II 'i::':':' II = ~I 'i*~ I ~":"; ~ ~ rFl ~ rP1 II ~ ,..+;71 -=-

,~--... ~~ .....r:::E:

..

A

~.J'1lI 6.,11' = .. .,J'. ~ <- <--.- -.-

" '~§l~'~~ CJ~ '-­~6

~ '-­YeO

IB

c

o

yeo .00 .<0 ·vco N"P\.,"'1fll

~.o COl_I' c:._,t c"""," ,I. T1!\..'I!:-~IC. .., 11"10

...cO "CO 'VCo ,",CO ... co veo ... co c_ ' c_ .t c:_"" ~ C:_ ... e .. _ ~ c ...... ~ c ... _ T c: .. _'t

~:~. +Z7 .. " ·"Y -nlj-- :1 'n.n"_VI-4F TR"' .... tIoMITT!:.R

LX« COHV£RT'E~ T_~"Il"

.. ,!:OILC.=~~CD ~iv.. --r

":~

VOl..TI>.GE REGUL .... TQR'!I CIRC.UIT C~o

rE>J4 O'IODI~

~~.....,.. 50tl. ,. ".J~ ~

o_,.~ NHJTIC"",- II:"\.£CTROWC'5

'----------------~ ••• 2'~ .....

:~lrI f'l~

ffn Irm tTTn

.J...

!l.!!o ,

NOTES

FOR ""n.'E:Me~'( S~E OWG o·a-n-S .... 'B

FO" VOLT""GoC' "'IlGu'-.... ~". c •• eVIT C.-.AO 1!oC ... e:M .... T1C:; ~a.a. OWG o-'&·r'7-~ .

& ..... LL Vc05 ARE SON':')!. .,.,,~ TI!.K·300~e.R c ........... 1I.1.. '"TO It. ~ ,. CI"~

• PI ... FUtotCT,()N~:

~ .. -, ~ .. ~ .. "' ... 4 ,

".''fIX. -...c:. CJ04 ...... 1"\I1" ........... TU,.1l·O'I'~.C. ~ I OUT~

~I"'I~."'~ ~"'4 ~ -. .. ..... ~~ _ .. c; ...... ,GIIlO\.WO

"'''' l' .n. VDC .8 ~~~~ I!!!!!!!!!:!~::~~~l:::~:!ll ""'" . ~ ..

~w .. (t .. v •• '1'.., ....... ~.~N«1 ..... c:.I'..51!.~

"'G~.'" + le..,ac CAL COo*<\I'MD ::.:=

c

!il II; ~:~:~~t:~::~ ~~~S~~~ ~~~~fi!~~~~~~~~~; tt~'~~~ 2~~~~~~~~·~~g~»9 vv'otfO I·· ... ~;';'iOOOOO

1 - -- _ ...... 10 111\.1 AIR 'SEA. INTER#fio.CTION

TELEMETR~ ~"S~~H

~CH£M ••• :TlC OECI4 6 e 1~1'111 A,DO~D ':'UP"Io.l4 C C;: ... ,1'

_AoOIW.-..4

'" ... .....,-; .. - !\-..o.I .... ,. ....... __ ,._ .

~~~<ol~'t.~J,.~~~ · · ..... ........ D-B-I1- I~

.... • !I"'eo '"10

J.:'e:,",I~'t><

z 3 ..

FIGURE 19: Remote Equipment: Schematic Deck 6

+="" I\)

- 43 -

vertically than horizontally. If planned tests support this evidence the

system will use horizontally polarized antennas in future.

4.17 Command Receiver

The command receiver used in the remote equipment is a TRF

Model RU-104G. It is a miniaturized, fixed tuned (465.2 MHz), single con­

version type capable of receiving frequency modulated signals. The output

level is typically 1 volt rms into 1000 ohms for an input signal with

±150 kHz deviation. The upper and 10wl~r 3 dB frequencies of the receiver

output are typically 50 kHz and 200 Hz. Po~er consumption is 1.4 watts at

28 volts.

l~ .18 Detectors

Two detectors are used to convert the tone-burst output of

the command receiver to voltage pulses. These are the turn-on detector and

the command detector, both of which are mounted on Deck 3 as indicated in

Figure 5 and have a common input.

4.18.1 Turn-On Detector

The turn-on detector (Figure 20) responds to a

2.3 kHz tone-input with an amplitude of 100 mV ±6 dB and produces a 27-volt

output level 3 seconds ±l sec after application of the input. The output

is used to set the latching, turn-on relay thus putting the system in the

active mode. The fact that an input must be present for 3 seconds prior to

an output arriving ensures that the system will not be inadvertently placed

in the aotive mode by receiver output noise.

The desired input frequency is selected by FL1,

a bandpass filter with 2.3 kHz centre frequency and a 0.35 kHz 3-dB band­

width. The approximate matching and insertion loss of FLl is 10 dB. Thus,

with 100 mV rms input, 30 mV rms is available at the base of Ql which is

a common-emitter amplifier with emitter-feedbacy- giving a voltage gain of

approximately 90.

Transistors Q2 and Q3 form a detector with a

threshold preset by R4 and R6 which hold the d.c. voltage of Q3 base at

A

-

B

1 I 2 I

R7 10K

3 I 4

• • , , 4 ~ " , • w." , , , ~ + 2 7 VOLTS

..J.! t 'CI 01 47 ... F IN9G.S sSt

R2 ~ IR~ ~RG 210K 10K 22K 410K

~

~+---4 8"" (IOOHv l RI +

10K. FILTER CO;;

I>-JPUT 4 .'22 ... F (TURN-ON -TONE FlI ~'/ TONE FRat'! 2 3 REC.EIVER) 0 0

RII 27K

RI2 47K

RI3 ~R14 2·2K "l' 5G.,,-

NOTES:

\. ALL RESISTORS ..... REo !l4 w , ~ %

'2. FILTER IS UTe No MNF -2-3

:e.. VOLT"" IN BRI>\CKETS ) "'-RE RM~ SIGN .... \.. YOLTJ>..GES. OTHER VOLTA.GES ..... Re

O. C. CONDITIONS.

4. .....LL C"'-F' ..... CITORS ARE POL ..... RI'ZEO

T ..... NT ..... LUM .'( PE S _

1 I 2

R15.J! 41K"C4

3~F' 3'5"

T

RIO 4 10.11.

R9

2115823 ~RB k;

IOK as

> 22K -fr CG

RIG b·8K

kK!2Q4

~N"',,!

, 1~.f48

3

RII 10K

....,.. 47 ... F 3O;;V OUTPUT

3

"XD3 ~IN43BS

RIB ::30.ll.

2

"TO TURN -ON RELA"Y

o VOLTS

B 124-(,-'11 I Q4. wl'oS 20./31.44

p,..,

L"TR

24-APR.I\...

,q'JO

O""'TE

Q4 ............ '2l '2.N~~&5. NO'TE 2. W' ... ~ t-'\"'F' .. 3-9 '30 "w"'~ 28" ...... ODED """"'" 4-

~~VI"\O"'"

BEDFORD INSTITUTE DAR'l!MOUTH NOVA sconA

TI11.E AIR -SEA INTERACTION

TELEMETR,( SYSTEM SCHEMATIC, TURN-ON DETE.CTOR

DAN. _717""" I 5C""LE NON~

DATE 27 FEB 1970 II ;. ~, ;_.r~_

DRAWING Nil B - B- \ 7- 33

4

FIGURE 20: Remote Equipment: Schematic Turn-on Detector

• - .

A

-I='" ~

-I='"

B

- 45 -

0.6 volt above that at Q2 base. The result is that Q3 is at cutoff for input

signals less than approximately 25 mY. For input signals between 50 mVand

200 mY, Q3 conducts on each half cycle and its collector-current pulses are

averaged by a low-pass filter made up of c4 and R15. The collector-current

of Q3 and values of c4 and R15 are selected so that the voltage across c4 rises to +3.5 volts in approximately 3 seconds. When the voltage across c4 reaches +3.5 volts, Q4 conducts causing Q5 to saturate and produce a +27 volt

output which sets the turn-on relay.

4.18.2 Command Detector

The command detector (Figure 21) is very similar

to the turn-on detector. The input filter has a centre frequency of 3.9 kHz

to match the command tone, and a 3 dB bandwidth of 0.59 kHz. The time

constant of the low-pass filter (c4, R15) has been selected to suit the

tone-burst repetition rate (10 Hz) generated by the telephone dial on the

shore station command encoder. The resulting detected output at Q5 collector

is a sequence of 27 volt pulses. If, for example, the number '6' had been

dialed at the shore station the sequence would contain six pulses. When

the number '0' is dialed, the sequence contains ten pulses. The output of

the command detector operates the nonlatching command relay

4.19 Interconnections on Deck 3 of the Electronics Package

A schematic diagram showing the interconnection of the

telemetry receiver and detectors discussed above, the wave staff electronics

circuit, and the main regulators is presented in Figure 22.

4.20 Control Circuitry

The function of the control circuitry (Figure 6) is to inter­

pret and act on the outputs of the detectors. The output of the turn-on

detector is merely used to operate the turn-on relay in the control circuit,

but the output of the command detector must be decoded before it can be useful.

4.20.1 Command Organization

All commands, except the turn-on and turn-off

commands, are represented by a t,w-digi t number ~ which is normally dialed

from the command encoder at the shore station. The turn-on command requires

A

B

1

I~ . '! v

..

2

R, 10 k

Reo CI .01 ~7",F hN~'~ ~!\"

~ I'~~ ~4"101<.

\IOO"W) RI I 10K. FIL,.ER

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NOTES:

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RI2 4,K

ALL RESISTORS P-.RE \/4 W. 5 %

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2.

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A

OUTPuT TO COM M "'NO RELAY

o VOLTS

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~4 "" ...... ZN'!~"S· ~~L 30" wA,-e, 2& v. ADDEO ..... OT~ 4

L.TR O"TE REV I '!!> I 0'-1 I B BEDFORD INSTITUTE

DARTMOIITH NOVA SCOTIA

TITLE AIR - SEA INTERACTIObt

TELEMETRY SYSTE.M SCHEMATIC, COMMA-NO DETECTOR

DIIN. ~ ""...-4. SCALE: ,""O",E

DATE 2~ FE.B 19,0 ::l7~

DRAWING Nil B - 5 - '7 - 3 I

4

FIGURE 21: Remote Equipment: Schematic Command Detector

~

+:"' 0\

......

A 3B

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WAVE STAFF ELECTRONICS C\RC.urr CARO

c- B-17 - 47

2 3 4

+2.1 SWrTCMUl 4 ou-<PVT

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I CIRCUIT C.-...RD

INPUT I

o "OL"~ 2 TURN.ON TONE DETEC.TOR. ""'''''' .Z7.JOC..'nIo : CIRCUIT C ..... RO

,P2 eENOI-K

DC:X::)P."·1S

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-t<! RECEIVER NOTE.'5: q! J2 TRF INCOR~OR ..... TED I. FOR A.S5EMBL""1 SEE owe; De \-:'- 5 .... ~

=t:;: SPRINGF'I~LD "IRGIN'''' COMM""ND TONE DETEC.T"oR 5C,HEM,:o..,."TIC MOO~I... RU - I04!G Z FOR '-----t2 _ ","~.:a. ""'M~ S,.E Ow"" B-e.-I"7-.oI.

RECE.IVER C :n 3 FOR TURN-ON 'Tc::>t--IE DETEC.ToR SCHEM,...",C A.I'--ITEto..IN""

SEE. D"'''' B-B-17-~3.

4_ CONNECTl0fl.l5 TO J2. ON RE<.EI'IEIi:':

PIN 1 +Z2. vDC. TO + 3<0 VDC.

z 3 ZERo VOLT5

0, "OLT~ A-I

5 SIGi.N~ STRENGoTH + 2.7 VOLT<;:, • 27 VOLT G N{C

a-.Tn'RY + ~'"- VOL"~ , REGUL,,"-TOR oF':. ., ouTPuT

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LTR ~TE REV\5.ION

BEDFORD INSTITUTE DMIT1IOUTH --- NOVA SCOnA "Z7 VOL"T~ (COVER) 6

mu AIR- SEA INTERA.CTION "8" eAT'm':1 + % VOLT':) (COVER') 7 27 VOLT (COVER) TELEMETRY S""'STEM

.,; SJro.."TTt:;RY R:E"'lU~ e REGUL .... TOR "s" ~CHEMA.TIC _ DECK :. (CQ'\l~R)VO\..~ R:ETV~ 5

DIM. lIJCGIJt'T---. sc.o..u=: . .-....aONE

MTE .2. 1="E.1!o 1'370 /:-~

DMWING .. t c- B-17-IO

2 3 A

FIGURE 22: Remote Equipment: Schematic Deck 3

A

B

c

-

D

+:­---,J

- 48 -

approximately three seconds to be sensed (Section 4.18.1) and is executed

by operating a pushbutton switch on the command encoder. The turn-off

command is a single '0' digit. Operation of the command encoder is detailed

in Section 5.1 of this report.

The total number of commands used in the telemetry

system and the function of each command were dictated by the requirements

of the various sensors which were to be placed on the platform. An inter­

pretation of these requirements led to the list of commands presented in

Table 3.

4.20.2 Command Decoding

The basic command decoding is accomplished by

the use of a rotary stepper switch, associated latching relays and control

circuits.

A rotary stepper switch is a mechanism consisting

of one or more wiping contacts carried by a common shaft which is rotated

by a unidirectional ratchet and pawl. The ratchet and pawl are actuated

by an electromagnet (solenoid) in response to momentary current pulses.

While a current pulse is present the solenoid is energized and the pawl

is cocked. At the instant the pulse ends the solenoid de-energizes and

releases the pawl, which, with the aid of spring tension, rotates the ratchet

and shaft ahead one step. The wiping contact thus moves from one fixed con­

tact to the adjacent one and its position is controlled by the number of

pulses to the solenoid.

The stepping switch used in the remote equipment

is an Automatic Electric Type 88 consisting of 10 decks or levelS each with

11 fixed contacts. The eleventh contact is known as the rest or home contact.

To establish a fixed starting point for the wiping contact the stepper switch

must be returned to the home position after each group of solenoid drive pulses

has occurred.

Utilizing one stepper switch to decode a two-digit

number involves certain requirements. The first and second digits must be

somehow distinguishable from one another. On the first digit, one of ten

choices is available (only one of seven is being utilized in the present

•

•

- 49 -

system). This choice must be sensed and remembered. A magnetically biased

latching relay, one of seven relays referred to as bank relays~ is used to

remember the first-digit choice. One of ten choices is then available to

the second digit. The choice must be again sensed and stored . This is

accomplished using a second latching relay, one of a number of relays

associated with each bank relay and known as selection relays.

Two additional decoder requirements are necessary:

(a) The bank relay which stores the current first-digit choice should

be reset after the second-digit choice is completed.

(b) The selection relay which stores the previous second-digit choice

should be reset whenever a subsequent first-digit choice is made in

the same bank.

Ambiguity will result if more than one bank relay, or more than one selection

relay associated with any bank relay, is set.

4.20.2.1 Details of Decoding

The circuitry which performs command

decoding is shown as part of Figure 23. Whenever a turn-on command is given,

the output of the turn-on detector, appearing at J3-14, sets relay K13 thus

supplying +27 volts to the various circuits in the command decoding circuitry

(Figure 23) and to the rest of the remote equipment. All relays in Figure 23

are shown in the rest or reset position. Pins 2 and 4 of all relays are at

zero volts. For the latching relays, pin 1 is the set terminal and pin 3 is

the reset terminal.

Output pulses from the command detector

are connected via J3-1B to the actuating coil of K15, the command relay.

Contacts 6 and 7 of K15 supply 27 volt pulses to the solenoid or actuating

coil of the stepper switch via D9 and the stepper's interrupter contacts

and also via R21. The current supplied via D9 (approximately 1 ampere)

flows until the solenoid operates causing the interrupter contacts to open.

When the interrupter contacts open, R21 supplies the solenoid holding cur­

rent (0.3 ampere) which is significantly less than the actuating current.

When K15 is de-energized, so also is the stepper coil, and the interrupter

contacts close.

TABLE 3

Command Directory for the Telemetry System

• COMMAND FUNCTION

Depress tur-a-on Places remote equipment in the aative condition sw~ tch and hold for from the standby condition. approximately 3 sec.

n Applies - 6.67 Vdc offset to T.A.* amplifier 1. 12 11 5.00 Vdc 11 " " " 1. -13 11 - 3.33 Vdc 11 11 " " 1. 14 " 1. 67 Vdc 11 11 11 11 1. 15 11 0.00 Vdc " 11 " 11 1. 16 11 + 1.67 Vdc " " " " 1. 17 " + 3.33 Vdc 11 11 11 11 1. 18 " + 5.00 Vdc 11 11 I' 11 1. 19 " + 6.67 Vdc 11 11 II " 1.

21 Applies - 6.67 Vdc offset to T.A. Amplifier 2. 22 11 5.00 Vdc 11 11 11 " 2. -23 11 3.33 Vdc " 11 11 11 2. -24 11 1.67 Vdc 11 " 11 " 2. 25 " 0.00 Vdc 11 11 11 11 2. 26 11 + 1.67 Vdc 11 11 11 " 2. 27 " + 3.33 Vdc " " " " 2. 28 " + 5.00 Vdc " " " " 2. 29 " + 6.67 Vdc 11 " " " 2.

31 Applies - 6.67 Vdc offset to T.A. amplifier 3. 32 11 5.00 Vdc 11 11 " " 3. -33 " 3.33 Vdc 11 11 11 11 3. -34 11 1.67 Vdc " 11 11 11 3. 35 " 0.00 Vdc " 11 " " 3. 36 " + 1.67 Vdc " 11 " 11 3. 37 " + 3.33 Vdc " 11 " 11 3. 38 11 + 5.00 Vdc 11 " " 11 3. 39 " + 6.67 Vdc " 11 11 11 3.

40 Sets gain of T.A. amplifiers 1,2 and 3 to 12.5, 12.5 and 62.5.

41 " " " " " 1, 2 and 3 to 25, 25 and 125.

42 " " " " " 1, 2 and 3 to 50, 50 and 250.

43 " " " 11 " 1, 2 and 3 to 100, 100 and 500.

*TA - ~brust Anemometer

•

Table 3 continued

COMMAND

50

51

60 61

71

72

73

70

80-89

90-99

o

- 51 -

FUNCTION

Simulates zero wind conditions by causing thrust anemometer to be covered and by disconnecting the outputs of the Aerovane anemometer. Also causes temperature probe to be covered and produce an output corresponding to the average temperature.

Normal operating mode; thrust anemometer exposed to wind, Aerovane outputs connected; temperature probe uncovered, measuring temperature fluctuations.

Sets Aerovane full scale range to ±21.2 m/sec. " " " " "" ±42.4 m/sec.

Applies zero volts to the input of all data veos as a centre frequency calibration input.

Applies +2.50 V d.c. to the input of all data veos as an upper band-edge calibration input.

Applies -2.50 V d.c. to the input of all data veos as a lower band-edge calibration input.

Returns system to normal operation from calibrate condition.

Not used.

Not used.

Returns remote equipment to standby mode from active mode.

- 52-

Relays Kl through K7 are known as

the bank relays, while K8 through K12 are several of the selection relays.

The command outputs from Jl and J2 are used to operate the 20 remaining

selection relays on decks 2 and 5 of the electronics package.

Relay K16 is the digit relay which

is set after the first digit and reset after the second digit of each com­

mand. The select-follower relay~ K17, is set on the second digit of every

command and serves to indicate that a selection has been made. After each

digit is decoded, the home relay, K14, is set and in conjunction with the

homing cam and interrupter contacts enables the stepper switch to advance

to the home position ready for the next digit. The wiping contacts of all

decks of the stepper switch, labelled SlB through SlJ in Figure 23, are on

a common shaft with the homing cam.

4.20.2.2 Relay Control Circuit

When the stepper switch has advanced

to a particular point in response to a dialed digit, the relay control cir­

cuit (RCC) (Figure 24) generates three 27-volt control pulses, Cl, C2 and C3

(Figure 25) which are used to set and reset various relays.

If a 21-volt step is applied to the

input of the RCC, the combination of Rl, R2, and capacitor Cl produces a

characteristic exponential voltage at the base of Ql. Transistors Ql and

Q2 form an emitter-coupled Schmitt trigger circuit with an upper threshold

of 4.5 volts. The voltage across Cl reaches 4.5 volts in approximately

120 msec, and operates the Schfiii tt trigger. 'I'he voltage change across R15

is differentiated by C2 and R7 and shaped by Q3 to produce a collector cur­

rent pulse approximately 30 msec wide. Transistors Q4 and Q5 form an output

amplifier capable of delivering a one-ampere, 30-msec pulse.

The circuitry in the RCC which generates

C2 and C3 is identical to that described above for Cl except for the value

of the delay times determined by R16, R17 and C3 and by R31, R32 and C5.

..

,'I -.4. 4 ,

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ANEMOM~Tt!.R; COVER CONTROL.

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- 53 -

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56 Pt.~CES

ON C-B-17-+5

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07 'N4,a~

5'

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FIGURE 23: Remote· Equipment: Schematic . Command Decoding Circuitry

-.. "'0 ~I ..

o 0 .: , · · · . • .. '

. .... , 1

~~ ol!-.

~ a,.

~ , ...

~ TURN-ON,

~IJ

_ TO RELpr..~ P\N~ 4" 'Z.

.

0/0

> cl " > .. 0

.. I~a , . .........- .

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• • • t

L- CIGIT S.E~ECi Ft)\..\..Owtt.R: ..

" u .. RELAY CON,.ROL CIRCUIT C"'RQ

C-B-17-SA 3(.

A

B

c

o

, .. P\IT

C. .",,1~4

•

QEL""" 5C).lMITT I P\.lL'SE I PULSE 'TRlGGE'R GENEA .... TOF1 AML1FIER

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,-...

2

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c. ... ' lOV

CONTROL PUL~E.

CI

NOTES:

,trr..LL RESISTORS A..RE "'" VI 5 "Y. ,

2 . R\ Rita ........ 0 R~I Itro.R!E '$EL~CTe.o ON. "l""I!.'5T TO ~N~UfltE

,-H ..... "T CONTROL. PUL.~ 00 NaT' O'IJER\....I'o..P ......... 0 T\ot#Io.."T

OE:L""Y~ ARE ,,~ INOC"'TEO 1!o~\.OW : CNO"",04ItroU."'f)

... "~ ; ·~lMPUT . . .,' , ,

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tao ,..,~, ... c:

el

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FIGURE 24: Remote Equipment:

co .,t.' -.. . .u ... . .. .,.

•

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3

r-

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"-'IC.

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CONTROL PULS~

CZ

3

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o VOL'"

CONTROL PU~E

CTo

mu "'tR ~ SE" IN"TER,Qrr."CTION TELEMI!TR';' 5Y5TEM

OCt<EM"'TIC. REL .... .,. CONTROL

-.. M1t"~ ~ .. \.c ' NOWe:

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__ u C-B-17-~5

4

Schematic Relay Control Circuit (RCe)

A

IB

I- V1 V1

tc

o

- 56 -

4.20.2.3 Decoding a Typical Command

To analyze the complete decoding pro­

cess it is helpful to examine, step-by-step, the operations which are neces­

sary to decode command 36, a typical command. In the following sequence all

circui t references are to Figure 23. Idealized waveforms occurring at

several points in Figure 23 during the decoding of command 36 are indicated

in Figure 25.

(a) A burst of three 27-volt pulses, nominally 50 msec wide with prf

of 10 Hz, appears at K15-1. K15 is thus energized and de-energized

three times.

(b) The stepper switch responds to the three 27-volt pulses produced

at K15-7 and stops at position 3.

(c) When the stepper moves off its home position, i.e., on the trailing

edge of the first pulse from K15, 27 volts is applied to K15-8 and

K14-6. Thus, the input to the RCC from K15-9 is the inverted form

of the signal at K15-7.

(d) The 10 Hz pulses are too narrow to operate the RCC. However, after

the third pulse has ended K15 is at rest and a +27 volt level is

present at the RCC input.

(e) Approximately 120 msec after the third pulse ends, control pulse Cl

is produced by the ReC. This pulse is routed via K16-8 and resets

the select follower relay if it is not already reset. In addition,

Cl is routed via SlJ-3 to set bank relay K3 and via J2-10 to reset

any selection rel8\}'" in bank 3 which was previously set.

(f) Approximately 40 msec later, C2 is generated and routed via K3-9

and K3-10 to set K16. the digit relay.

(g) Approximately 40 msec later, C3 is produced and sets the home relay

K14. Since the stepper is off-home at this point, homing contacts 2

and 3 are closed. Thus +27 volts is available for the stepper

solenoid via K14-6, ~14-7, D8, and the stepper interrupter contacts.

The stepper switch operates in the self-interrupting mode until the

wiper is home. At this point, homing contacts 2 and 3 are opened

by the cam and the stepping action ceases. The home relay is reset

by the +27 volts now appearing at homing contact 1. The system is

now ready for the next digit. At this point K16 and K3 have been

set, Kl7 and all selection relays in bank 3 have been reset.

+27v ... nJUl~ __ ----U 100m, +27,

ruu ,~ . . ---- .+6.8v

I I I I

n+27V

... --------------------~ ,

n+27V" n --------------------~ ,~----------------------------~ ~--~-------

n+VV, n ______________________ ~ , __ -----------------------------J~--------HOMING TIME U HOMING TIME U

•

INPUT TO COMMAND RELAY KI5

INPUT TO RELAY CONTROL CIRCUIT

VOLTAGE WAVEFORM ACROSS CAPACITOR CI

C1

Cz

C3

CONTROL PULSES FROM RCC

FIGURE 25: Voltage Waveforms Pertaining to Figure 23 during the Decoding of Command 36

Vl ~

- 58 -

(h) When a 6 is dialed the stepper switch advances from home to position 6.

(i) Approximately 120 msec after the end of the sixth pulse, Cl is

generated and routed via K16-9, K16-10, K3-6, K3-7, SlD-6 and J2-6

to set the proper selection relay. Pulse Cl also sets the select

follower relay, K17.

(j) Approximately 40 msec later, C2 resets K3 via K3-l3 and K3-12.

(k) Approximately 40 msec later, C3 is generated and resets K16 via

K17-6 and K17-7. The home relay K14 is also set by C3 thus

initiating the homing cycle. The stepper advances the remaining

five steps to home and the system is ready for another command.

4.20.2.4 Decoding a Turn-Off Command

When a turn-off command (zero) is

dialed, the stepper advances to position 0 (ten steps). Control pulse Cl

resets K14, the turn-on relay, via K16-9, K16-8 and SlJ-O. Power is thus

turned off but the stepper is not yet in the home position. However, as

K14 resets, +27 volts is applied to the stepper coil via K14-l2, Kl4-ll, , homing contacts 5 and 6, and the interrupter contacts. The stepper advances

one position to home, the homing contacts open and the system is in the

standby mode.

4.20.2.5 Decoding Thrust Anemometer Amplifier Gain and Offset Commands

A schematic of the circuitry which

implements the changes in thrust anemometer gain and offset is shown in

Figure 26. Command outputs (27-volt pulses) from Jl and J2 on Deck 4 are

wired to Jl and J2 in Figure 26, while the thrust anemometer amplifier is

connected to J3 and J4. Reference to the amplifier schematic (Figure 10)

may be helpful in the following discussion. By applying +15 volts to J3-4,

-5, -6 or -7, negative offsets of magnitudes as indicated in Figure 10 and

Table 2 are obtained at the output of MI,P 1. Similarly by applying -15 volts,

positive offsets are obtained.

Relays Kl through K5 are associated

with AMP 1 only and are used to perform the final decoding of the second

..

•

•

- 61 -

digit of the offset commands. Offset-polarity decoding is accomplished

via Kl which receives a set pulse on pin 1 whenever a negative offset is

required, i.e., on commands 11, 12, 13 and 14. Relay Kl receives a reset

pulse on pin 4 whenever a positive offset is selected. In the set mode

Kl supplies K2-7, K3-7, K4-7 and K5-7 with +15 volts; in the reset mode,

wi th -15 volts.

Relays K2 through K5 perform the

fUnction of offset-magnitude decoding. Relay K5 is set when command 19

or command 11 is given, thus applying plus or minus 15 volts respectively

to J3-7. Similarly, K4 is set on command 18 or 12, K3 on command 17 or 13,

and K2 on command 16 or 14. \{hen zero offset is required none of the relays

are set and J3-5 is connected to zero volts via pins 9 and 8 of K4 through

K2 and via Rl. Offset control for JI.MP 1 and. AMP 3 is accomplished similarly

by use of K6 through KIO and Kll through K15 respectively.

Gain control of the three amplifiers

is accomplished using K1E, K17, Kl8 and Kl9, only one of which is set to

establish a particular gain. Recall from the discussion of the amplifier

schematic that the gain of all three amplifiers is changed simultaneously.

\{hen command LfO is given K16 is set and J3-B is connected. via K16-l2 and

-13 to J3-12 providing a gain of 12.5 for M{P 1. Other contacts on K16 set

the gain of AMP 2 and AMP 3 to _12.5 and 62.5 respectively.

Commands 41, 42 and 43 set K17, K18

and K19 respectively and establish the remaining gains for the three

amplifiers.

4.20.2.6 Decoding the VCO Calibration Commands

In Figure 23, selection relays Kll and

K12 implement the veo calibration commands. Both Kll and K12 are in the

reset mode when the yeO's are not being calibrated, i.e. when the system

is telemetering signals from the sensors.

To perform a veo calibration it is

necessary first of all to apply +27 volts to the relay inside each yeo.

- 62 -

This is accomplished when either Kll or K12 or both are set. The internal

VCO relay is used to select one of two VCO inputs, i.e. a signal from a

sensor amplifier, or reference voltage. The reference voltages are available

via contacts on Kll and K12.

In Figure 23, when either Kll or K12

is set, +27 volts is available on J3-11 and is used to operate the VCO

calibrate relays. Thus the VCO calibrate voltage on J3-12 is selected as

the input to all the veo's. This voltage is generated across R20. (Reference

to Figure 19 may be useful here.) If command 71, centre frequency, is

dialed both Kll and K12 are set by a pulse from SlH-l and the voltage across

R20 is zero. On command 72, upper band edge, Kll is set thus placing RIB,

R19 and R20 effectively in series across the +15.0 volt regulated supply.

The voltage across R20 is set to +2.500 volts ±0.005 volts by adjustment of

RIB. Relay K12 is set on command 72 thus connecting R16, R17 and R20 in

series and with R16 properly adjusted - 2.500 volts ±0.005 volts appears

across R20.

4.20.2.7 Decoding Other Commands

The Aerovane control relay, KIO in

Figure 23, is set by the pulse on SlG-l when command 61 is dialed and reset

by that on SlG-O when command 60 is dialed. Operation of the Aerovane

control was previously discussed in section 4.B.2.

The zero wind si~ulator relay, K9,

and the thrust anemometer cover control relay, KB, are both set by a pulse

on SlF-l when command 51 is dialed. Relay KB applies +27 volts to J2-1B

which causes the anemometer cover to open, while K9 connects the Aerovane

outputs on J3-6 and J3-7 to the Aerovane control circuit as discussed in

section 4.8.2. Command 50 resets K8 and K9 with a pulse on SlF-O.

At present there are no commands

allocated between 80 and 99 and there is no bank relay to accommodate an 8

or 9 when either of these digits are dialed as the first digit of a command.

It may be verified from Figure 23 that, except for the home relay, no change

results in the status of any relay in the remote equipment after an B or 9

has been dialed as a first digit.

•

•

•

•

- 63 -

4.21 Command Retransmit

The command readout unit in the shore equipment responds to

commands regenerated and telemetered by the remote equipment. Contacts 14,

15 and 16 on the command relay, K15 in Figure 23, supply +27 volts to Rl

each time the relay operates. The output voltage which appears across the

parallel combination of R3 and C3 and at J3-13 is nominally -2.5 volts when

K15 is at rest, and +2.5 volts when K15 is energized. Capacitor C3 filters

out the inevitable contact bounce. The command retransmit feature provides

an indication that commands are being detected properly, although it does

not check the operation of the stepping switch and relays.

4.22 Operation of the Remote Equipment from the Stable Platform

In cases where a failure occurs in the telemetry system, it

is important that service personnel visiting the stable platform have a means

of checking the operation of the remote equipment. Also, some means, apart

from the use of the complete telemetry system, of operating the remote equip­

ment in the laboratory during testing and calibrating is necessary.

A test unit capable of generating the required turn-on pulse

and command pulses connects to the electronics package via a cable and an

8-pin connector. The unit also permits emergency voice communications over

the telemetry link. Several test points on the unit enable measurements of

critical signals and voltages in the electronics package to be made without

removing the cover of the package.

In the schematic of the test unit (Figure 27) the operative

contacts on the command dial are represented as S3. These contacts open and

close as numbers are dialed. Transistor Q3 functions as an inverter produc­

ing 27-volt positive-going output pulses which are used to operate the

command relay in the electronics package .

The turn-on control, 82, provides 27 volts to operate the

turn-on relay. The remote equipment will respond to commands from the test

unit and from the telemetry link, but not simultaneously.

RI 4 .7K

01 IN965fl

OV

R2 lOOK

H ~pf .6f 4 .7K

n,

+1.. C4 ..l22fLf

35 Volts o Volts

R9

33 K

C5 .lfLF

, , DETAIL A

RIO 220 K

220pf

RII 10.!l

-, NORMALLY , CLOSED CONTACTS

S3 T 1

Lr'~<U RI3

6.6 K

TURN ON

+I C6 15fLF 35 Volts

CONTROL

II 3.2.!l :: 0 : : El SPEAKER II II TI

HAMMOND

() 0 ::0

3: ITI ()

3: ITI J> <: Z ITI 0 ::0

--t c:

-0 ::0 0 + c z c r --t N Vl 3: -0 I + -..I ITI 0 -0 C 0

Vi < Vl z X --t < Vi

ELECTRO OCEANICS 51F8M -1-- 4 6 7 2 6 5 3

TITLE

BEDFORD INSTITUTE DARTMOUTH NOVA SCOTIA

SCHEMATIC - TEST UNIT FOR AIR SEA INTERACTION

TELEMETRY SYSTEM

DRN. ART COSGROVE I ENG. ~"7-~ DATE NOV. 17. 1971

DRAWING N2 B- B - 17-50

FIGURE 27: Remote Equipment: Schematic Test Unit

.. •

.. ~

0\ +=""

..

•

- 65 -

An amplifier, comprised of IC2 and associated components,

is used to boost the command receiver output to a level sufficient to

operate a speaker, so that command tones and voice from the shore station

may be audible.

Integrated circuit ICl and associated components function

3.S an amplifier for the output of the microphone (MIC). The amplifier

output is coupled, via Sl, to the multiplex (MPX) line. This line carries

the 13 multiplexed tones and is the input to the modulation control ampli­

fier (see Fig. 6). If 81 is in either of the 'ON' positions, the low out­

put impedance of the microphone amplifier reduces the level of the multi­

plexed signal to practically zero. The full deviation range of the telemetry

trans~~tter is then available to the voice signal from the microphone.

5. DETAILED DESCRIPTION OF SHORE EQUIPHENT

The reader may wish to review the block diagram of the shore equip­

ment (Figure 3) at this point. An interconnection diagram for individual

units making up the shore equipment is presented in Figure 28.

5.1 Command Encoding and Transmission

Except for the turn-on and turn-off commands, the various

commands as listed in Table 3 are encoded as two-digit n~bers which are

dialed on a telephone-type dial on the command. encoder (Figure 29). The

operative contacts on the dial are used to key a 3.9 kHz audio oscillator.

The dial contacts are normally closed and relay Kl is used to provide a

normally open contact pair which applies pulsed power to the 3.9 kHz veo as the dial returns to its rest position. During this period the dial con­

tacts open and close a number of times corresponding to the digit dialed.

The mark-to-space ratio of the resulting tone bursts is nominally 1:1 with

a tone duration of approximately 50 msec.

The turn-on tone is generated by the 2.3 kHz VCO for as long

as power is applied to it via the turn-on switch. The output of both VCOs,

at a nominal level of 1.0 volt rIDS each, is fed to the command-tones input

- 66 -

ANTENNA

I

TELEMETRY TRANSMITTER

H ~t:> - '" 10 I I--

-0 II MOD.

""4

"'3 AUDIO PANEL

+28V ~2

OV ..nl --- MICROPHONE

~ +28 V COMMAND

TONE ENCODER

CHART 6 CHANNELS RECORDER OUT PATCH PANEL

13 ~ CHANNELS (~

~ COMP. B DISCRIMINATORS

COMMAND AGC

READOUT COMPo UNIT SIG.

(~ (~ (~

COM. COMPo MPX/REFERENCE DISCR

OUT COMBINER MPX.IN

(~

CH-I

r<JJ LINE -IN TAPE RECORDER CH-I LINE-OUT MICROPHONE

(~ AGCIOUT

S VIDEO TELEMETRY RF OUT RECEIVER IN ANTENNA

FIGURE 28: Shore Equipment: Interconnection Diagram

A

B

~

3A Hammond ~ 125v XI67M25

115v I IJ7K' .r----60Hz I

I I

o-------Y

2

1·5K~

to

100uf r-------~+I~r--------~

3 4

TURN ON ....I.... (

'\ .'. • ••• 1\/("('\

~22-0.A

~ ~ 1 100- 4·7K> 506K

220f\. }Jf

OA202~1 ~' I 2~~Al ! -f~fO

I ~ ·05}Jf t: 1 Kl IN759A

·75.1'\. = NOTE: VCO'S ARE Teledynamics

TYPE 1270 AL OR EQUIVALENT

506K

I - I - I

I I 13 I

12 I~I-.J-_J

..

A

JI BEDFORD INSTITUTE I B

2

Cannon DE - 95 TRANSMITTER

DRIVE

3

DARTMOUTH --- NOVA SCOTIA

mu

COMMAND ENCODER

I'!- ~ f'y:" ,_ ~,

DRAWING NI!

4

FIGURE 29: Shore Equipment: Schematic Command Encoder

0'. -:]

- 68 -

of the audio panel (Figure 29) via Jl-8 (Figure 28). The tones are buffered

in the audio panel by a unity-gain amplifier and then fed to the command­

transmitter modulation-input.

The command encoder unit also contains a regulated 28 volt

d.c. power supply which is used to operate the VCOs, the command transmitter

and the audio panel. The total current drain on the power supply is

approximately 0.9 ampere.

The command transmitter is a TRF Model T-102 UHF, FM trans­

mitter. The transmitter is fixed-tuned to 465.2 MHz, has an efficiency of

38% and an output power of 6 watts when driving a 50 ohm resistive load.

Deviation sensitivity at the modulation input is 8 kHz per volt. The trans­

mitter is not protected from extremes of VSWR and thus should not be operated

without a suitable matched load (50 ohms). Normally, to reduce antenna feed­

line losses the transmitter should be located as near as practicable to the

antenna. The loss in RG-8 cable is 12 dB per 100 metres at 465 MHz.

In operation the transmitter output is fed to a 50 ohm,

6-element, vertically polarized, yagi antenna, Sinclair type 306 (Sinclair

Radio Laboratories Limited, 1969). The antenna weighs 2 kg (4.4 lb), has a

maximum overall length of one metre and gives a directional gain of 9 dB

relative to a half-wave dipole.

5.2 Audio Panel

The audio panel (Figure 30) makes emergency voice communica­

tions possible over the telemetry link and would normally be used only when

personnel were on the stable platforn:. The panel contains a microphone­

amplifier and switch followed by a unity gain buffer amplifier which feeds

the modulation input of the command transmitter.

In addition the audio panel contains an amplifier and a

speaker which are connected to the output of the telemetry receiver and

enable an operator to monitor transmissions from the remote site.

_ A_

B

2

1.5 M

4.7 K 68PI

+28V

10K +15 V

0.11'-1

470 K

IN965B OV

OV .0011'-1

n~~ ~ ~ r330Pf

MULTIPLEX INPUT

N/C

OV

27K

OV

OFF -< ON

(MOM.)

HAMMOND 119 A

•

3 4

OV

+28V

r------------II~o 31 COMMAND TONES

4 I Tx MODULATION

TBI

BEDFORD INSTITUTE DARTMOUTH --- NOVA SCOTIA

-

SIGNAL I cd 1 ~;> ~~ RETURN 12 2 ALTEC

TBI 456B

TITLE AIR-SEA TELEMETRY SYSTEM SCHEMATIC

AUDIO PANEL

OV DRN. ART COSGROVE ~ DATE MAY 12, 1972

DRAWING N!1 B - 8-17- 62

2 3 4

FIGURE 30: Shore Equipment: Schematic Audio Panel

A

B

0\ \0

- 70 -

5.3 Antenna and Telemetry Receiver

A six-element, vertically-polarized yagi antenna is employed

at the shore station as a receiving antenna. The antenna is a Sinclair

type 206-EB (Sinclair Radio Laboratories Ltd., 1969) manufactured for a

frequ~ncy of 228.0 MHz. The antenna feeds the receiver via a length of

RG-8/AU 50 ohm coaxial cable. As in the case of the transmitter the

feedline should be as short as practicable.

A tunable telemetry receiver .laS chosen for the shore station.

The receiver is an Astro Communications Laboratory Inc. type TR-I09 (ACL,

1969) designed to receive standard FM IRIG format in the 55 to 2300 MHz

frequency range, demodulate the FM carrier and supply the modulation data

to a demultiplexer or a recorder. A plug-in tuning head, ACL type TH-I02P,

covering the 216-260 llliz telemetry band completes the telemetry receiver.

The receiver will typically produce a 20 dB signal-to-noise ratio at an

output bandwidth of 50 kHz with 0.8 ~v RF input deviated ±100 kHz .

The modulation data output (1 volt rms into 75 ohns) and

the AGC output voltage (0 to -8 volts into 10 k~) are available at connectors

on the receiver rear panel. An integral low-pass output filter, with select­

able cut-off frequencies of 50, 25, 12.5 and 6.25 kHz, makes it possible to

control the final bandwidth of the receiver. The filter is normally operated

at 50 kHz bandwi dth.

5.4 Multiplex/Reference Combiner

The modulation data from the receiver is in IRIG propor­

tional bandwidth, frequency-division-multiplexed format, and is normally

referred to as multiplexed tones or multiplexed information (MPX). This

signal is fed to the multiplexer/reference combiner where a 14.5 ¥~z ± 0.01%

sine wave signal is added to it prior to recording. The purpose of the

14.5 kHz reference frequency is to enable data reduction equipment at the

BIO computing centre to automatically compensate for differences in tape

speed between recording and playback.

The combiner (Figure 31) contains a 28-volt regulated power

supply, a 15 kHz low pass filter to reduce the system noise-bandwidth and

•

..

AI

B

2

IA

---;-~ HAMMOND I "" \JAr' 53899

115 Vac I ~ II~ 30Vac r-<"" ~ 40Vdc I

* I I I I I ] GE SH4D4

~

10K MPX INPUT~3

15KHz

-:-LOW PASS FILTER

UTC LPM- 15000

COMMAND DISCRIMINATOR DRIVE

2

15K

560fl?

10001 ,.,.1 -2NI480

1.5fl

4.7K '\1\1'1,

+ 28 Vdc

L 8

14.5 KHz

CRYSTAL OSCILLATOR ~ I SONEX TEX _ 3417 47K

2

3

2N3442 , \.....--.... j

+28 Vdc

TELE - DYNAMICS

11910

AMPLIFIER

5

4

I, +28Vdc , , O+28Vdc

10K

+1 300 ~

,.,.1 !L300 '7"1\28 Vdc T,.,.I

IK

10K

o VOLTS

-

f COMPOSITE OUTPUT TO DATA DISCRIMINATORS

BEDFORD INSTITUTE I DARTMOUTH NOVA SCOTIA

TITLE

SCHEMATIC, MPX DATA- 14,5 KHz COM81NE R

DRN. ART COSGROVE ~-DATE 26 -9-71

DRAWING NQ B - 8-17-52

3 4

FIGURE 31: Shore Equipment: Schematic MPX/Reference Combiner

IA

-.l f-'

B

__ 72 _

to remove the command tones (22 kHz), a 14.5 kHz crystal oscillator, a

resistive adder and an output amplifier which drives the tape recorder.

The output level from the amplifier is nominally 3.7 volts p-p for the

composite signal (12 data tones plus the reference) or 0.28 volts p-p for

each tone. In some cases, depending on the frequency response of the tape

recorder being used, it may he necessary to increase the level of the

reference tone to ensure sufficient signal on playback.

5.5 Tape Recorder

A Crown Model CI-822 (Crown International Corp., 1969),

two-track tape recorder records the data and reference tones at 7~ inches

per second on track 1 "Thile track 2 is used for a voice record of the time

of day, date, location and pertinent rr.eteorological information at the time

of recording. Maximun v!ow and flutter at this speed is 0.09%. The recorder

has tape speeds of 15, 7~ and 3 % inches per second with speed regulation

of ±O.2% for a ±10% change in the 117 volt a.c.supply.

A SOURCE/TAPE switch on the recorder enables the recorder

input or the output from a separate tape playback. head to be selected for

monitoring. During recording, monitoring in the ~ftxE position enables a

check to be made on the quality of the recorded data. Headphones are provided

for aural monitoring, while a discriminator bank and chart recorder are

available for checking individual data channels.

5.6 Data Honi torine;

The composite output (I? data channels plus the reference

signal) from the tape recorder is connected to the input of a solid-state

discriminator system (Airpax Electronics Inc., 1966) which separates and

converts the frequency-modulated, multiplexed sir:nals into their original

form, analog voltages.

Each of the tHelvc data. discriminators, Airpax Type FDS 34,

accepts an input betvTeen 10 mV and 10 volts rms Hi thout adjustment. The

output amplitude of each is adjustable froI!1 ±l volt peak to ±lO volt peak

•

•

- 73 -

corresponding to a ±7.5% change from the centre frequency of its channel. In

the present system the nominal output is set to ±4.50 volts full scale. Each

d.iscriminator has an Il-Hertz, linear-phase, low-pass, output filter (Figure 32).

Zero stability of the discriminator output is within ±0.5% of full scale for

24 hours after a 20-minute warm-up period.

The 14.5 kHz reference discriminator, Airpax Type FDS 35,

is physically and electrically similar to the FDS 31~. The FDS 35 senses

tape speed error by responding to variations in the 14.5 kHz reference tone

and provides a compensation signal for up to 12 data discriminators. A

reduction in signal error or noise of at least 20 dB for tape speed varia­

tions of up to ±3% (WOVT and flutter) may be realized using the FDS 35.

Output signal is zero at 14.5 kHz and changes by approximately 800 mV per

cent deviation from the reference frequency, positive for highpr frequencies

and negative for lower frequencies.

The outputs fror::. the twelve c.ata discriminators are fed to

a patch panel where selected channels may be monitored on the chart recorder.

In addition, the patch panel contains a meter which can be connected by a

rotary switch to the output of anyone of the discrirr.inators.

Although battery life can be closely estimated by considering

capacity and discharge rates, monitoring the voltage gives a good indication

of the remaining capacity particularly since the underwater battery is at a

relatively constant temperature and the discharge current is comparatively

low.

A Model 2£0, siY.-channel chart recorder manufa.ctured by Gou1d­

Clevite Corp. (Brush Instruments Division, 1968) is employed for data moni­

toring and has eight chart speeds ranging from 125 mm/s down to 1 mm/min.

Each channel occupies 40 mm of the chart width and contains 50 divisions.

The sensitivity range is selectable from 1 mV/div. to 10 V/div. in 13 steps;

a setting of 200 mV per division or ±5 V full scale is normally used. The

full-scale frequency response ±l division from d.c. to 40 hertz is more than

adequate to display the outputs of the discriminators.

w

1.0

0.8

0.6

0.4

(J) 0 .2 z o a.. (J)

w 0::

0.1 w > 0.08

I-« 0.06 ....J w 0::

0.04

0.02

0.01 I

- 14 -

- r--...... """'" '" '\

\ ~

\ 1. \

~

~

\ i

2 4 6 8 10

FREQUENCY 20

( Hz) 40

FIGURE 32: Typical Frequency Response of an 11 Hz, Linear-Phase Discriminator Output Filter

, i

~, 60 80 100

•

•

- 15 -

5.1 Command Readout Unit

Although the command readout unit does not playa direct

role in processing the telemetry I~X signal, it is of valuable assistance

to the operator since it provides him with an autorratic display of commands

which have been dialed. In addition, since the readout unit is operated

by the commands retransmitted from the remote site, correctly displayed

commands indicate that the remote command detector and relay are functioning.

Of course, an observation of the telemetry information on the chart recorder

will also usually indicate whether or not commands are being detected

correctly.

In its method of operation, the command readout unit is

similar to the remote equipment control circuitry presented in section

4.20.2.1. Only those areas where the operation of the readout unit and the

control circuitry differ will be discussed in detail here.

The readout unit (Figure 33), contains an FM discriminator

operating on IRIG Channel 14 which is used to demodulate the retransmitted

command tones. The discriminator output is buffered and used to operate

the command relay. From there, commands are decoded as discussed in 4.20

except that the turn-on command is detected via the AGC voltage of the tele­

metry receiver, which changes from 0 volts to at least -3 volts when the RF

signal from the remote site is sensed by the receiver. The AGe voltage is

buffered and used to operate the turn-on relay.

Commands are displayed using indicator lamps on the front

panel of the readout unit. Seven lamps, arranged vertically near the left

side of the unit and labeled 'I' through '1', indicate which bank relay

has been selected or, correspondingly, which digit was dialled as the first

digit of a command. A bank indicator lamp is extinguished when the second

digit of a command is dialled, of course.

Corresponding to each bank lamp is a number of seZection

lamps arranged horizontally to the right. One lamp in each horizontal row

will be on indicating the second digit of the most recent command dialed

in that row. When the second digit is '0' no lamp is on. The seZection

- 76 -

lamp is extinguished when the first digit of a new command is dialled in

its row.

Occasionally, the reception of noise may cause the command

readout unit to lose digit synchronization with the remote unit and misin­

terpret the retransmitted command. Any uncertainty may be cleared up by

dialhj::: 88, for example, and then redialing any commands suspected of being

incorrect.

6. REMOTE EQUIPMENT CALIBRATION

The calibration involves setting up regulated output voltages, ampli­

fier offsets, and VCO frequencies. The equipment must be removed from its

case for all adjustments; however, a number of checks can be made via the

test box. Unless otherwise noted all voltages should be measured with res­

pect to deck 6 mounting plate (Figure 5), and the input supply voltage should

be set to 34 volts.

6.1 Equipment

To perform the calibration the following equipment is

required:

a. power supply 28-39 volts d.c. with 2 ampere capacity,

b. digital voltmeter (DVM) 4-digit or better,

c. decade resistance box, 0 to 1000 ohms in one-ohm steps,

d. test unit (Drawing B-B-17-50),

e. digital frequency counter capable of measuring AF and VHF,

f. resistor 5.6 k~ ±l%, \ watt,

g. Oscilloscope, low frequency.

The power supply and the test unit should be connected to

the remote equipment for the duration of the tests. Proper power supply

connections are indicated in Drawing C-B-11-54 in Appendix B.

6.2 Regulator Adjustments

These adjustments should be performed prior to making any

l'

- 77 -

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or r or j r r r o. o.

... zaV'_ITeM[

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~tl r' ~tl [' r--§st{ r' $)!( r' i)t{ r ' .. r--~~l r' r--~t{ r' r-[:Stt r' .--~t[ r ~tt _r' ~flr' :stJt r' .. ow ow

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co_ 2fY

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~ J;'" ~- HOMI •• 0 ¥ ~

CAM

STIPP •

son .w 10 ..

ov

FIGURE 33: Shore Equipment: Schematic Command Readout Unit

•

- 79 -

other adjustments. Set the power supply voltage to 34 volts. Consult the

regulator assembly drawing (Figure 34) and measure the input voltage to the

regulators at eyelet #7. This should be 27 volts ±1.0 volts; if not, the

master regulator should be investigated .

With the correct voltage at eyelet #7, the positive output

regulators may be checked. Heasure the voltage at eyelet #4. Adjust R19

if required to obtain +15.00 volts ±0.03 volt.

Check the voltage at eyelet #6 and adjust R30 to obtain

+6.00 volts ±0.03 volt.

Measure the voltage at eyelet #8 and adjust R41 to obtain

a reading of +25.5 volts ±0.25 volt.

Check the input voltage to the -15 volt regulator at eye­

let #1; a reading of -22 volts ± 3 volts is satisfactory. Readings outside

this range indicate possible malfunction in the dc/dc converter which is

located on the under side of deck 6.

Monitor the voltage at eyelet #2 and adjust R9 to obtain

-15.00 volts ±0.02 volt.

Verify that the +15, +6 and -15 volt regulated outputs vary

less than ±0.03 volt and the 25.5 volt output varies less than ±O.l volt

for a ±5 volt variation in the input supply voltage.

6.3 Thrust Anemometer Amplifier Adjustment

This adjustment involves setting the initial offset of the

amplifiers to zero and, in conjunction with the thrust anemometer, nulling

the effect of the residual output of the latter. Reference to Figures 10

and 35 will be useful at this point.

Connect a 5.6 kQ ±l% resistor between 0 volts (C2 positive)

and the input of AMP 1 (Al pin 3), Dial command 15 using the test box.

Monitor the voltage at pin 6 of Al. Adjust RIO to achieve a voltage of

o volts ±0.025 volt.

A

-

B

-

c

-

D

I 2 3 I 4

- 4-40 eOLT, NUT, FL'!)"T WA..SHER I ~ LOCK WA.~'I-IER. 4 PLJlt..C.Ec::.

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o V ~ -{@I}- ~ V t;J ~ ~ V ~ A C 12 R r;J QIEo I r '{2 .@:]}o®@ Q ~ ~~ §. ~ -cmr ~Zl @R 8 ~ Qi9 ® ~ L ~ ~s. ~ ~ ¢

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A

B

l"MBION 2 REQD

NO 1'91'38-4 L FIT EYELET (lp.,,\(E 1014"5-4) I­

PLACE':::,

NOTES:

FOR 5CHEM,o...T1C SEE DR ..... W\NG O-B-I7-~9

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I 2

FIGURE 34: Remote Equipment:

I

BEDFORD INSTITUTE Do\ImIOUlH -- NOVA SCOlIA

mu: AIR-SEA. INTERA.CTION TELEMETR.,. ""'YSTEM

SUB ,,""''''''.,. • REGUL"TOR"'"

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Subassembly, Regulator Board

():) o I

•

_ 81 _

Dial command 25. Connect the resistor to the equivalent

point in AMP 2. Adjust R20 to obtain an output of 0 volts ±0.025 volt from

AMP 2. Dial command 35 and make the equivalent adjustment for AMP 3.

The next adjustment requires that the thrust anemometer which

will actually be used with the system to be connected and oriented truly

vertically. The thrust anemometer amplifiers should be placed in the highest

gain setting by dialing commend 43; commands 15, 25 and 35 are required in

addition. Then, with reference to Figures 10 and 35, adjust R20 to produce

an output of 0 volts ±0.025 volt at pin 6 of Al. Repeat using R40 and A2,

R60 and A3.

In the event that the thrust anemometer is unavailable, the

procedure to follow represents a compromise. Adjust R20, R40 and R60 to

produce 0 volts ±0.025 volt at their wipers.

6.4 Battery Voltage Monitor

The battery voltage monitor has a fixed gain and adjustable

offset. With reference to Figures 8 and 36, and an input supply voltage of

28 volts, adjust R6 to obtain -2.50 volts ±0.05 volt at the collector of Ql.

Check that this voltage rises to +2.50 volts ±0.15 volt when the input

voltage is increased to 38 volts.

6.5 Wavestaff Electronics Board

Connect the decade resistance box to the system via the

appropriate connector. Set the decade box to the value of resistance

corresponding to the total wavestaff resistance plus any cable resistance

if appreciably greater than one ohm. Monitor the voltage across the box

with the oscilloscope. With reference to Figures 14- and 37 adjust Rl to

achieve a 5-vblt peak-to-peay_ square "la.ve (some cross-over distortion may

be evident but it matters little).

With the DVM monitor eyelet #6 indicated in Figure 37.

Adjust R2 to obtain -2.50 volts ±0.025 volt. This voltage should change

to +2.50 volts ±0.025 volt when the decade box is set to a value of zero

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mu AIR·SEI'>. INTERACTION TELEMETRY ",,-.-STEM

SUB ASSY DEC!< 4 COMI"Cl'-IENT-;:-

... ~..",..-"""'" 15C.A..LE '2.1

DATE IS APRIL Ic:liO

_ ..... C- B-17- 51'.44

2 I 3 4

FIGURE 36: Remote Equipment: Subassembly, Deck 4 Components

A

1-

IB

L 0:> tAl

I

C

f-

D

- 84 -

plus the cable resistance. If the noted reading is not obtained, some

iterative adjustment of Rl and R2 will be required. Note that Rl is a gain

control and affects the difference between the two voltage readings, whereas

R2 is an offset control which merely shifts both readings up or down by the

same amount.

6.6 VCO Calibrate Voltages

The veo calibrate voltages are generated only when the

calibrate commands are dialled. Monitor eyelet 22 indicated in Figure 36,

with the DVM. Dial 71 and checy. that the DVM reads a volts ±0.005 volt.

Dial 72 and adjust R18 (Figure 36) to obtain a reading of +2.500 volts

±0.005 volt. Dial 73 and adjust R16 to obtain -2.500 volts ±0.005 volt.

6.7 veo Adjustments

The following adjustments mru:e use of the IRIG standard

frequencies listed in Table 1. Generally, it is expedient to measure the

period rather than the frequency of the veo output if high accuracy is

required in a short time. (Averaging 100 periods reduces short-term jitter.)

Initially the output amplitude of each yeO, measured at the

individual test points, should be set to nominally 1.0 volt peak-to-peak

using the OUTPUT control. Then, with command 71 dialed, each FREQ control

should be adjusted to give the correct period corresponding to the centre

frequency as measured at the test point. Similarly, when command 72 is

dialed, the proper upper-band-edge periods may be obtained by adjusting the

indiyidual SENS controls on each yeo. The lower-band-edge periods may be

checked by dialing 73.

All adjustments should achieve the required frequency or

period readings to better than one part per thousand.

6.,.1 Commmand Retransmit veo

The command retransmit VCO does not undergo the

calibrate sequence since doing so would override the retransmit function.

Under quiescent conditions, when no commands are

being dialled, the output frequency measured at the test point should

A

-

B

-

c

- I

0

•

I 2 I 3

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FIGURE 37: Remote Equipment: Subassembly, Wavestaff Electronics Board

A

B

I-

c

I-

o

co V1

- 86 -

correspond to the lower band edge (Table 1, channel 14). If not, the FREQ

control should be adjusted.

Next, the command dial should be operated and held

at a point which causes the stepping switch to be cocked. Under these

conditions the SENS control should be adjusted to obtain the required upper­

band-edge frequency. Some interaction occurs between adjustments and as Ii

result both adjustments may have to be repeated. Frequencies within ±l% of

the required frequencies are sufficiently accurate for proper tllnctioning

of the retransmit YCO. The output measured at the test point should be set

to nominally one volt peak-to-peak using the OUTPUT control.

6.8 Transmitter Deviation

The transmitter deviation is adjusted by varying the gain

and hence the output signal level of the modulation control amplifier.

Monitor the amplifier test point with the oscilloscope and adjust the gain

to obtain a nominal 1.5 volt peak-to-peak signal. The highest peaks of the

signal will occur at a relatively low repetition rate and it is important

to be sure that the correct peak is observed.

As an alternative, if a VHF deviation meter or a VHF receiver

with calibrated deviation in~icator is available adjust the gain of the

modulation control amplifier to achieve a maximum deviation of 110 kHz

±10 kHz.

7. SHORE EQUIPMENT CALIBRATION

Calibration of the shore equipment involves setting regulated volt­

ages, YCO frequencies and output levels, data discriminator outputs and the

14.5 kHz -·reference level.

Unless otherwise noted, the equipment should be operated on 110-

130 volts a.c., 60 hertz and all voltage measurements should be made with

respect to the chassis of the piece of equip~ent being tested.

•

•

•

•

- 87 -

7.1 E~uipment

a.

The following equipment is required for the calibration:

digital voltmeter (D~4), 4-digit or better,

b. audio frequency, sinewave or squarewave oscillator,

c.

d.

oscilloscope, low frequency,

resistor, 33 ohm ±10%, 50 watt.

7.2 Command Encoder

If the command transmitter is not connected to the system

the 33-ohm resistor should be used to simulate the normal load imposed on

the regulator in the encoder (Figure 28) by the transmitter. With the regu­

lator thus loaded, the output voltage across the load should be set to

26 volts ±2 volts using the 1000 potentiometer on the regulator board.

To set the command VCO (Channel 9, 3.9 kHz) monitor the veo

test point with the oscilloscope. Operate and hold the dial between digits

so as to enable Kl to de-energize; adjust the OUTPUT control on the veo to

obtain nominally 3 volts peak-to-peak on the oscilloscope. With the dial

held again, monitor the frequency at the VCO test point; adjust the FREQ

control to achieve a frequency of 3.9 kHz ±40 hertz.

The turn-on veo can be similarly adjusted when the turn-on

button is depressed. An output voltage of 3 volts peak-to-peak and a

frequency of 2.3 kHz ±25 hertz are desirable.

7.3 MPX/Reference Combiner

Without using any external load resistance adjust the

1000 ohm potentiometer on the regulator board in the combiner to obtain

+28 volts ±l volt at the regulator output.

Monitor the eOt~OSITE OUTPUT on the combiner (Figure 30)

using the oscilloscope. Connect the signal generator to the MPX input on

the combiner and set the output amplitude of the generator to zero. Adjust

the OUTPUT control on the 14.5 kHz reference oscillator to obtain a nominal

0.5 volt peak-to-peak signal on the oscilloscope.

to 1 kHz and its output to 2.5 volts peak-to-peay.

Set the generator frequency

Adjust the control on the

- 88 -

1191D amplifier to obtain a nominal 3.0 volt peak-to-peak signal at the

COMPOSITE OUTPUT jack on the combiner.

7.4 Discriminators

A detailed description of the discriminator calibration is

given in the manufacturer's handbook (Airpax, 1966). Briefly, it involves

supplying band-centre and band-edge frequencies to each of the discriminators

and adjusting the ZERO and OUT controls to achieve the desired output

voltages.

On the reference discriminator set the tape speed compensa­

tion (TSC) to off. Connect the signal generator to COMPOSITE B input on

the discriminator rear panel; set the amplitude to 0.1 volt rms and the

frequency to the centre frequency of Channell. On Channell discriminator

monitor the output voltage with the Dm~ and adjust the ZERO control to obtain

a reading of 0 volt ±0.025 volt. Change the oscillator frequency to the

upper-band-edge frequency of Channel 1 and adjust the OUT control to obtain

an output of +4.50 volts ±0.025 volt.

Repeat the procedure for the remaining discriminators. In

the case of the reference discriminator the only possible adjustment is ZERO.

This adjustment should be made with an input frequency of 14.500 kHz ± 2 hertz.

8. CONCLUSION

The telemetry system described in this report has been and will con­

tinue to be subject to minor modifications and changes as dictated by the

types of experiments and measurements undertaken by users. For example,

although the rate of evaporation from the ocean is an important parameter,

the present system does not include a humidity sensor. Future plans call

for interfacing such a sensor to the system. In addition, some experiments

have been conducted using a sonic anemometer in place of the thrust anemo­

meter. The use of practically any new sensor requires some modification to

the telemetry system. These modifications are usually temporary and are

documented in AOL File 6040-10 at Bedford Institute of Oceanography.

•

•

•

•

- 89-

9. ACKNOWLEDGEMENTS

The original telemetry system, which was lost in December 1969, was

developed by J.A. Dimmers and G.E. Awalt. The assistance received from

G.E. Awalt during the design of the replacement system is gratefully acknow­

ledged. The initial breadboarding, evaluation and testing of many of the

circuits for the system were carried out with considerable input by R. Cassivi.

Liaison with R.G. Mills, responsible for the stable platform installation,

proved beneficial in instrumenting the tower with strain gauges and

accelerometers.

I would like to acknm-Tledge the fruitful discussions with S.D. Smith

and C.S. Mason during the design stage of the project and the assistance of

S.B. MacPhee and S.D. Smith during the preparation of this report.

10. REFERENCES

AIRPAX ELECTRONICS INC. 1967. FM Discriminator System, Instruction Manual,

Seminole Division, Fort Lauderdale, Florida.

ASTRO COt~JICATIONS LABORATORY INC. 1969. VHF/UHF Telemetry Receiver,

Type TR-I09, Instruction 1~nual. Gaithersburg, Maryland;

seven sections.

BENDELL, E.A. 1970. Turbulence Thermometer Manual. Atlantic Oceanographic

Laboratory, File No. 5420-10, Dartmouth, Nova Scotia.

BRUSH INSTRUMENTS DIVISION. 1968. Mark 260 Recorder Operating Instructions,

Gould-Clevite Corp., Cleveland Ohio, 79 pp.

CROWN INTERNATIONAL. 1969. Operating and Service Manual, Series PRo-800

Model IM-8 Recorder/Reproducer. Elkhart, Indiana, 34 pp.

DOE, L.A.E. 1963. A Three-Component Thrust AneIl"oI'leter for Studies of

Vertical Transports Above the Sea Surface. Bedford Institute

Report 63-1, 87 pp.

GRUENBURG, E.L., editor. 1967. Handbook of Telemetry and Remote Control.

McGraw Hill Book Co., New York.

- 90 -

JASIK, H., editor. 1961. Antenna Engineering Handbook. McGraw Hill Book Co.,

New York.

MILLS, R. G. 1972. Design and Installation of the Atlantic Oceanographic

Laboratory Stable Platform, Bedford Institute of Oceanography Report

Series BI-R-72-4.

NAUTICAL ELECTRONICS LABORATORIES LTD. 1969. VHF FM Telemetry Transmitter

Handbook. Hackett's Cove, Nova Scotia. (held in Systems Engineering

Section, BIO.)

SINCLAIR RADIO LABORATORIES LTD. 1969. General Catalogue. Maple, Ontario.

SMITH, S.D. 1969. A Sensor System for Wind Stress Measurements. Bedford

Institute Report 1969-4, 64 pp.

SMITH, S.D. 1970. Thrust Anemometer Heasurements of Wind Turbulence,

Reynolds Stress and Drag Coefficient Over the Sea. J. Geophys. Res.

75: 6758-6770.

SMITH, S.D., L.A.E. DOE, and R.G. STEPHENS. 1969. Thrust Anemometer

Measurements of Reynolds Stress over the Sea off Chebucto Head,

N.S., Bedford Institute Report 1969-5, 12 pp.

TAIANI, P.M. 1971. Nova Scotia Research Foundation, Drawing E-l-l,

Flexible Wave Sensor, Dartmouth, Nova Scotia.

TAIANI, P.l1. 1970. Nova Scotia Research Foundation, Series of Drawings

on Thrust Anemometer Cover, Dartmouth, Nova Scotia. (Copies held

in Systems Engineering Section BIO.)

THORBURN, J.P., and D.F. DINN. 1971. On-Line Analog-to-Digital Hardware

at the BI Computing Centre. Atlantic Oceanographic Laboratory

Report 1971-3, 17 pp. (unpublished).

VINE, R.N. 1970. Bedford Institute of Oceanography, Drawing No. D-B-18-Al.

Details of submersible gland for RF connector.

•

•

•

- 91 -

APPENDIX A

Additional System Information

Included in this appendix is a complete list of drawings for the

telemetry system, wiring diagrams pertinent to the remote equipment, and a

discussion on expected battery life. The drawings are held in Systems

Engineering Laboratory at Bedford Institute of Oceanography. Drawings in

the list which have been used in this report are indicated by inclusion of

the appropriate figure number.

Drawing No.

E-B-17-Al

E-B-17-2

D-B-1'7-SA3

C-B-17-4

E-B-17-5

D-B-17-5A6

D-B-17-7

c-B-1'7-8

D'-B-1'7 - SA9

C-B-17-10

C-B-17-11

D-B-17-SAl2

E-B-17-13

C-B-17-14

D-B-17-SA15

D-B-17-16

C-B-17-17

D-B-17-SA18

D-B-17-19

C-B-17-20

TABLE 4

AIR-SEA INTERACTION TELEMETRY SYSTEM

Drawing List

Title

General Assembly

Schematic, Interdeck wiring

Deck 1 Assembly, cover

Schematic, Deck 1

Deck 1 Chassis, cover

Subassembly Deck 2

Schematic, Deck 2

Chassis, Deck 2

Subassembly, Deck 3

Schematic, Deck 3

Chassis, Deck 3

Subassembly, Deck 4

Schematic, Deck 4

Chas sis, Deck 4

Subassembly, Deck 5

Schematic, Deck 5

Chassis, Deck 5

Subassembly, Deck 6

Schematic, Deck 6

Chassis, Deck 6

Figure No.

39

38

22

23

26

19

Appendix A

Drawing No.

C-B-17-2l

B-B-17-22

C-B-17-23

B-B-17-24

B-B-17-25

C-B-17-26

B-B-17-27

B-B-17-28

D-B-17-29

E-B-17-30

B-B-17-3l

C-B-17-SA32

B-B-17-33

C-B-17-SA34

C-B-17-35

C-B-17-SA36

C-B-17-37

C-B-17-SA38

D-B-17-39

C-B-17-SA40

C-B-17-~1

C-B-17-SA42

C-B-17-43

C-B-17-SA44

B-B-17-45

B-B-17-SA46

C-B-17-47

C-B-17-SA48

E-B-17-49

B-B-17-50

B-B-17-51

- 92 -

Title

Standard plate

Retainer bolt

Spacer rod

Spacer

Spacer tapped

Circuit card bracket

Cable support rod

Cable support bracket

Mounting base

Container

Schematic, Command decoder

Subassembly, Command decoder

Schematic, Turn-on decoder

Subassembly, Turn-on decoder

Schematic, Relay control

Subassembly, Relay control

Schematic, Amplifiers

Subassembly, Amplifiers

Schematic, Regulators

Subassembly, Regulators

Schematic, Deck 5 components

Subassembly, Deck 5 components

Figure No.

21

20

24

10

38

9

34

Schematic, Deck 4 components

Subassembly, Deck 4 components

Schematic, Master regulators

Subassembly, Master regulators

Schematic, Wave staff electronics 14

Subassembly, Wave staff electronics 37

8,15

36

7

Schematic, Readout unit

Schematic, Test unit

Schematic, VCO input limiters

33

27

18

•

•

Appendix A

Drawing List continued

Drawing No .

B-B-17-52

C-B-17-53

C-B-17-54

B-B-17-55

B-B-17-56

C-B-17-57

B-B-17-58

B-B-17-59

B-B-17-60

B-B-17-61

B-D-56-1A

B-D-56-2A

B-B-17-62

- 93 -

Title

MPX data/14. 5 kHz combiner

External cable diagram

External cable diagram

Thrust anemometer cover wiring

Air-Sea Telemetry system (block diagram)

Air-Sea Telemetry system (block diagram)

Schematic, Command encoder

Aerovane and control circuit

Subassembly, veo limiters

Shore Equipment, Interconnection diagram

Air Sea Interaction, Thermistor Thermometer, Schematic

Air Sea Interaction, Thermistor Thermometer, Wiring diagram

Schematic, Audio Panel

Figure No.

31

40

41

12

3

6

29

16

28

17(a)

30

A

-

B

~

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IJ~ BII.TTERY

1

IJ1 TE~T

ACCESS

'2~·I[B'&'.'2'1 yyyyyyyy

~I~I~I! G } • ~ !1!ljlll~I~lm . ~

I z " " ~ Z

.. i

% 0

~ « ~ " ~e )- 0 0 ~

"It I-r I III n , ~ ~ L ~ ~ B 0 1 J

!( 6 ~ J , -~

~ ~ r '" ~ o ~ ~ u • S P t ~

~ ~ ) ) n i ) r> .. ~~ u" ~ 0 ~ ~ a~ "' .. + " III~ .. , <J + " +

11 2 ~,. e,"16g'01l,tl

TB 3

I

3 I 4

IJS IJb IJ8 AE~IIE WA'IE SPARE

~EN50R

I 2 " .. I 2 S 4 43 t. I

Ji..:

~I ~1~ls ~ 3 • ~ il ~I 01: Hn il~lil~

I I I I

66 U 9 IQ 1\ It

TB ~

3 I

IlEDfCflll ..... ," u, ~ -.-rnt --- _A lamA

11M AIR-SEI>. INTERI'.CTION TELEMETRY 5YSTEM

e.CHEHATIC , O~CK I

---' 5c .... LE wo .... e

DAft 5 M ... RCW 1970

__ .. C-B-11-4

4

FIGURE 38: Remote Equipment: Wiring Diagram, Deck 1

•

A

B

r \0 +="" I

IC

I-

o

A

-

B

c

o

• • •

OPEN~

CLOSE I~ :

VULCANIZED RUBBER SPLICE

BLACK 1- --, BLACK

WHITE I WHITE

RED -! RED

2

COVER ,--E C

D

3

VULCANIZED RUBBER SPLICE

I

{

I BLACK 1--, BLACK

THERMISTER 2 WHITE WHITE

4

TEMPERATURE PROBE

F\ r---AI B

E

COMMON~

ELECTRO OCEANICS 51F4M-1

GREEN I GREEN A

SHIELD 3 RED

4 D

COMP I RETURN

COMP 2 RETURN

COMP 3 RETURN

+6.00V RETURN

""-LB;L~EN 8407 CABLE

~ B L--

ITT CANNON MS3106E 14S-5S(C)

(5 PIN FEMALE)

ELECTRO OCEANICS BELDEN 51F4M-1 8407 CABLE

~ Ie C

-c F' l...---

BENDIX 10-72614-6S

(6 PIN FEMALE)

COVER CONTROL CABLE (OVERALL LENGTH 30 FT )

TEMPERATURE PROBE CABLE (OVERALL LENGTH 30 FT )

ELECTRO OCEANICS 51F8M-1

ANEMOMETER r--. .---

A BLACK

WHITE I I Ie H RED B

GREEN J ORANGE C

BLUE K

BROWN F YELLOW Yt

BENDIX 10 -72622-14S (19 PIN FEMALE)

THRUST ANEMOMETER CABLE (OVERALL LENGTH 30FT)

2

AMPHENOL UG-94IB/U

CABLE CONNECTOR WITH B I AMPHENOL

D-B-18AI (ISS 2) UG-94IB/U SUBMERSIBLE GLAND OR EQUIVALENT

"0 ~ 0 ~ BELDEN #8214 ~

50 OHM COAXIAL CABLE OR EQUIVALENT

TRANSMITTING ANTENNA CABLE (OVERALL LENGTH 30 FT)

RECEIVING ANTENNA CABLE (SAME AS ABOVE EXCEPT OVERALL LENGTH 25FT)

3

mu

BEDFORD INSTITUTE DAIITIIOUTH --- NOVA sconA

EXTERNAL CABLE DIAGRAMS

- Vi.A. COLLINS' : h~ . __ ... ,. l5ZE>I7. _ .... N. C-8-17-53

4

FIGURE 40: Remote Equipment: Sensor Cables

fA

B

c

I-

o

\0 ~

A

B

c

D

2

VULCANIZED RUBBER SPLICE WAVESTAFF

3

TAPED SPLICE

4

DRIVE I I RETURN 2

BLACK r - -, r - , BLACK

WHITE I I I

RED I • I

GREEN I :

I • ~

3

4 '----J

ELECTRO OCEANICS 51F4M-1

--B~LDEN

ELECTRO OCEANICS 51F2F -I

BLACK'-"" (+)RED 1 IA

~ - WH ITE I BANANA PLUG POWER

RED I I (_) BLACK SUPPLY

3 GREEN I I BA~JA:NA PLUG 4 • L_...J

8407 CABLE

WAVESTAFF CABLE (OVERALL LENGTH 25 FT)

VULCANIZED RUBBER SPLICE ANEMOMETER

ELECTRO OCEANICS

51F4F-1

SINE~ .. , BLACK i-:- ~ BLACK ,c A

tTC I U/UITC" WH" '- WHITE +36V(A)

COSINE 3

COMMON 2

4

ELECTRO OCEANICS 51F4M-1

RED

GREEN

RED B C

D

... E

... F

+36V(B)

OV(A)

OV(B)

ELECTRO OCEANICS 51F4F-1

BENDIX 10-72614-6S

(6 PIN FEMALE)

AEROVANE ANEMOMETER CABLE (OVERALL LENGTH 25FT)

2

BATTERY TEST CABLE (OVERALL LENGTH AS REQUIRED)

USS "TIGER" BRAND CABLE 4 CONDUCTORS

NEOPRENE JACKET (TYPE SO) OR OTHER SUITABLE TYPE ,

~ VULCANIZED ~ T RUBBER SPLICE J

BATTERY CABLE (OVERALL LENGTH AS REQUIRED)

BATTERY

ELECTRO OCEANICS 51F2M-1

BEDFORD INSTITUTE

3

1IT1..E DAImIOIITH --- NOVA SCOTIA

EXTERNAL CABLE DIAGRAMS

- W. A. COLLINS I l ?1 . .. ,. 16/6/11

.......... C-B-17-54 4

FIGURE 41: Remote Equipment: Sensor Cables

B

c

D

\0 ex>

•

•

•

- 99 -

Appendix A

EXPECTED BATTERY LIFE FOR AIR-SEA TELEMETRY EQUIPMENT

The following table shows the expected battery life in relation to

the average number of operating hours per day. The table is based on the

equation:

battery life (days) = _.---;2::;.;0:...;0'--_ 1. 5 + 0. 75t

where 200 is a conservative figur'e for the ampere-hour capacity of the

batteries which are rated at 270 Ah. 1.5 is the number of ampere-hours con­

sumed per day in the standby mode, 0.75 is the difference in operating and

standby battery currents (amperes), and t is the average number of operating

hours per day. The nominal operating current, 0.81 amperes, includes the

approximately 0.25 ampere required by the strain gauge electronics used in

the 1970 field season. If the signal conditioning electronics for the

external signals indicated in Figure 6 requires less than 0.25 ampere from

the battery then an increase in battery life will result. The new lifetime

can be calculated from the given equation if the 0.75 in the denominator

is reduced by an. amount equal to the decrease in battery current (ampere).

TABLE 5

Battery Life

Average No. of Operating Hours

per day

Expected Battery Life

0.00 0.25 0.50 0.75 1.00 1.25 1.50 1. 75 2.00 2.25 2.50 2.75 3.00 3.25 24.0

(days)

133 119 107

97 89 82 76 71 67 63 59 56 53 51 10

- 100 -

APPENDIX B

Telemetry System - Pin Listings

..

- 101 -

Appendix B

AIR-SEA TELEMEtRY SYSTEM

DECK #1 •

TB 1

•

PIN TO WIRE ALSO TO WIRE DESIGNATION

1 IJ3-1 #18 BLACK 2Pl-8 #26 WHITE THERMISTOR LEAD #1

2 IJ3-2 #18 WHITE 2Pl-9 #26 WHITE THERMISTOR LEAD #2

3 IJ3-3 #18 RED 2PI-I0 #22 BLACK SHIELD

4 IJ3-4 #18 GREEN

5 IJ4-1 #18 BLACK 6Pl-9 #26 WHITE STRAIN GAUGE SIGNAL #1

6 IJ4-2 #18 WHITE 6Pl-l1 #26 WHITE STRAIN GAUGE SIGNAL #2

7 IJ4-3 #18 RED 6Pl-13 #26 WHITE STRAIN GAUGE SIGNAL #3

8 IJ4-4 #18 GREEN bPl-15 #26 WHITE STRAIN GAUGE SIGNAL #4

9 IJ4-5 #18 ORAlWE 4P3-22 #22 RED +27 VOLTS SWITCHED

10 IJ4-6 #18 BLUE 6P2-21 #22 BLACK o VOLT RETURN

11 IJ4-7 #18 WHITE/BLACK 6P2-8 #22 VIOLET -20 VOLTS

12 IJ4-8 #18 RED/BLACK

•

- 102 -

Appendix B

AIR-SEA TELEMETRY SYSTEM

DECK #1

TB 2 •

PIN TO WIRE ALSO TO WIRE DESIGNATION

1 1J1-1 #lB BLACK 5Pl-19 #26 WHITE THRUST AN. SIGNAL #1

2 1Jl-2 #lB WHITE 5P1-1B #22 BLACK SIGNAL #1 RETURN

3 1Jl-3 #lB RED 5P2-7 #26 WHITE THRUST AN. SIGNAL #2

4 1Jl-4 #lB GREEN 5P2-6 #22 BLACK SIGNAL #2 RETURN

5 1Jl-5 #lB ORANGE 5P2-20 #26 WHITE THRUST AN. SIGNAL #3

6 1Jl-6 #lB BLUE 5P2-19 #22 BLACK SIGNAL #3 RETURN

7 1Jl-7 #18 WHITE/BLACK 6P2-5 #22 GREEN +6 VOLTS D.C.

B 1J1-B #18 RED/BLACK 6P2-22 #22 BLACK o VOLTS RETURN

9 1J2-1 #lB BLACK 4P2-1B #22 WHITE COVER "OPEN" SIGNAL

10 1J2-2 #lB WHITE

11 1J2-3 #lB RED 4P2-19 #22 WHITE COVER "CLOSE" SIGNAL

12 1J2-4 #lB GREEN 3P3-13 #22 BLACK o VOLT RETURN (COVER)

- 103 -

Appendix B

AIR-SEA TELE~lliTRY SYSTEM

• DECK #1

TB 3

•

PIN TO WIRE ALSO TO WIRE DESIGNATION

.1 IJ9-1 #18 BLACK 3P3-11 #22 YELLOW +36 VOLT BATTERY

2 IJ9-2 #18 WHITE 3P3-10 #22 YELLOW/WHITE +36 VOLT COVER BATTERY

3 IJ9-3 #18 RED 3P3-12 #22 BLACK COVER BATTERY RETURN

4 IJ9-4 #18 GREEN 3P3-18 #22 BLACK BATTERY RETURN

5 IJ7-8 #18 RED/BLACK 6P2-7 #22 BLACK SIGNAL RETURN

6 IJ7-7 #18 WHITE/BLACK 6P2-6 #26 WHITE VCO MULTIPLEXED TONES

7 IJ7-6 #18 BLUE 3P3-7 #26 WHITE TURN-ON COMMAND ..

8 IJ7-5 #18 ORA.NGE 6P2-16 #22 BLUE -15 VOLTS REGULATED

9 IJ7-4 #18 GREEN 3P3-6 #26 WHITE COMMAND INPUT

10 IJ7-3 #18 RED 6P2-10 #22 ORANGE +15 VOLTS REGULATED

11 IJ7-2 #18 WHITE 3P3-20 #22 WHITE RECEIVER OUTPUT

12 IJ7-1 #18 BLACK 3P3-8 #22 YELLOW +27 VOLTS

•

- 104 -

Appendix B

AIR-SEA TELEMETRY SYSTEM

DECK #1

TB 4 •

PIN TO WIRE ALSO TO WIRE DESIGNATION

1 IJ5-1 #18 BLACK 4P3-6 #26 WHITE AEROVANE SINE SIGNAL

2 IJ5-2 #18 WHITE 6Pl-2 #22 BLACK SIGNAL RETURN AND SHIELD

3 IJ5-3 #18 RED 4P3-5 #26 WHITE AEROVANE COSINE SIGNAL

4 IJ5-4 #18 GREEN

5 IJ6-1 #18 BLACK 3P3-15 #26 WHITE WAVE STAFF SIGNAL

6 IJ6-2 #18 WHITE 6Pl-16 #22 BLACK SIGNAL RETURN

7 IJ6-3 #18 RED SPARE '"

8 IJ6-4 #18 GREEN SPARE

9 IJ8-4 #18 GREEN SPARE

10 IJ8-3 #18 RED SPARE

11 IJ8-2 #18 WHITE SPARE

12 IJ8-1 #18 BLACK SPARE

•

•

•

Appendix B

AIR-SEA TELEMETRY SYSTEM

DECK #1

- 105 -

lPl0 50 n COAXIAL N TYPE CONNECTOR, AMPHENOL PART NO. 82-5379

TO WIRE DESIGNATION

6P3 RG58/u TRANSMITTER OUTPUT

Appendix B

AIR-SEA TELEMETRY SYSTEM

DECK #1

- 106 -

1P11 50 n COAXIAL BNC CONNECTOR, AMPHENOL PART NO. 31-242

TO WIRE DESIGNATION

3P1 RG174ju INPUT RECEIVER

•

..

- 107 -

Appendix B

AIR-SEA TELEMETRY SYSTEM

DECK #2 •

2P1

• PIN TO WIRE ALSO TO WIRE DESIGNATION

1 6P2-14 #22 ORANGE +15 VOLTS REGULATED

2 6P2-20 #22 BLur -15 VOLTS REGULAT:CD

3 6Pl-20 #22 BLACK o VOLT RETUPJI

4 4P3-25 #22 RED +27 VOLTS SWITCHED

5 6P2-9 - #'22 VIOLET -20 VOLTS

6 6P1-1B #22 BLACK o VOL'IS RET1.JR1~

7 6Pl-17 #26 WHITE TEMPEPP_,="URE OUT?"CT

• 8 TB1-1 #26 lomITE THERMISTOR IHPUT 1

9 TBl-2 #26 I-mI'EE THERMISTOR INPUT 2

10 TBl-3 #22 BLACK SHIELD

11 4P2-16 #26 WHITE COMMAND 51

12 lfP2-17 #26 WHI'l'E COMMAND 50

•

•

Appendix B

AIR-SEA TELEMETRY SYSTEM

DECK #3

108

3Pl 50 Q COAXIAL SUBMINIATURE CONNECTOR FEMALE

TO WIRE

IPll RG174/u

•

DESIGNATION

INPUT RECEIVER

..

•

•

o

- 109 -

Appendix B

AIR-SEA TELEMETRY SYSTEM

DECK #3

3P2

PIN TO WIRE ALSO TO

1 3J3-5 #22 YELLOW TOTD-4

2

3 TOTD-2 #22 BLACK CTD-2

4

5

6

7 TOTD-1 #26 WHITE CTD-1

NOTE: TOTD - Turn-On TONE DETECTOR, CTD - Command TONE DETECTOR.

WIRE DESIGNATION

#22 YELLOW +27 VOLTS

#22 BLACK o VOLT RETURN

#26 WHITE RECEIVER OUTPUT

- 110 -

Appendix B

AIR-SEA TELEMETRY SYSTEM

DECK #3

3P3

•

PIN TO WIRE ALSO TO WIRE DESIGNATION

1 4P3-24 #22 RED +27 VOLTS SWITCHED

2 4P3-18 #26 WHITE #26 WHITE COMMAND OUTPUT

3 6Pl-24 #22 BLACK o VOLT RETURN

4 4P3-14 #26 WHITE TURN-ON COMMAND

5 4P3-15 #22 YELLOW +27 VOLTS

6 TB3-9 #26 WHITE COMMAND INPUT

7 TB3-7 #26 WHITE TURN-ON COMMAND ..

8 TB3-12 #22 YELLOW +27 VOLTS

9 4P3-17 #22 YELLOW/WHITE +27 VOLTS COVER .'"

10 TB3-2 #22 YELLOW/WHITE +36 VOLTS COVER

11 TB3-1 #22 YELLOW +36 VOLTS

12 TB3-3 #22 BLACK COVER BATTERY RETURN

13 TB2-12 #22 BLACK o VOLT RETURN (COVER)

14 3P3-14 #22 RED/WHITE +25.5 VOLTS REGULATED

15 TB4-5 #26 WHITE WAVE STAFF SIGNAL

16 4P3-1 #26 WHITE WAVE HEIGHT OUTPUT

17 4P3-16 #22 YELLOW +36 VOLTS

18 TB3-4 #22 BLACK BATTERY RETURN

19 6Pl-4 #22 BLACK o VOLT RETURN

20 TB3-11 #22 WHITE RECEIVER OUTPUT ..

- III -

Appendix B

AIR-SEA TELEMETRY SYSTEM

DECK #4 •

4Pl

• PIN TO ,.aRE ALSO TO WIRE DESIGNATION

1 5Pl-8 #26 WHITE COMMAND 11

2 5Pl-9 #26 WHITE COMMAND 12

3 5PI-I0 #26 WHITE COMMAND 13

4 5Pl-11 #26WHITE COMMAND 14

5 5Pl-12 #26 WHITE COMMAND 15

6 5Pl-13 #26 WHITE COMMAND 16

7 5Pl-14 #26 WHITE COMMAND 17

8 5Pl-15 #26 WHITE Cm-1MAND 18

• 9 5Pl-16 #26 WHITE CO~1AND 19

10 5Pl-17 #26 WHITE RESET BANK #1

11

12

13

14

15

16 5P1-21 #26 WHITE COMMAND 21

17 5Pl-22 #26 WHITE CO!-11'1AND 22

18 5Pl-23 #26 WHITE COMMAND 23

19 5Pl-24 #26 WHITE COMMAND 24

20 5Pl-25 #26 WHITE COMMAND 25

21 5P2-1 #26 WHITE COMMAND 26 0

22 5P2-2 #26 WHITE COMMAND 27

23 5P2-3 #26 WHITE COMMAND 28

24 5P2-4 #26 WHITE COMMAND 29

25 5P2-5 #26 WHITE RESET BANK #2

- 112 -

Appendix B

AIR-SEA TELEMETRY SYSTEM

DECK #4

4P2 •

PIN TO WIRE ALSO TO WIRE DESIGNATION

1 5P2-9 #26 WHITE COMMAND 31

2 5P2-10 #26 WHITE COMMAND 32

3 5P2-11 #26 WHITE COMMAND 33

4 5P2-12 #26 WHITE COMMAND 34

5 5P2-13 #26 WHITE COMMAND 35

6 5P2-14 #26 WHITE COMMAND 36

7 5P2-15 #26 WHITE COMMAND 37

8 5P2-16 #26 WHITE COMMAND 38

9 5P2-17 #26 WHITE COMMAND 39

10 5P2-18 #26 WHITE RESET BANK #3

11 5P2-23 #26 WHITE COMMAND 41

12 5P2-24 #26 WHITE COMMAND 42

13 5P2-25 #26 WHITE COMMAND 43

14 5P2-22 #26 WHITE COMMAND 40

15

16 2P1-11 #?6 WHITE COMMAND 51

17 2PI-12 #26 WHITE COMMA...lIJ"D 50

18 TB2-9 #22 WHITE "OPEN" COVER SIGNAL

19 TB2-19 #22 WHITE "CLOSE" COVER SIGNAL

20 OUTPUT BATTERY MONITOR

21 6P2-18 #22 BLUE -15 VOLTS REGULATED

22 6P2-12 #22 ORANGE +15 VOLTS REGULATED

23 6PI-7 #26 WHITE WAVE HEIGHT SIGNAL

24

25

- 113 -

Appendix B

AIR-SEA TELEMETRY SYSTEM

• DECK #4

4P3

• PIN TO WIRE ALSO T,O WIRE DESIGNATION

1 3P3-16 #26 WHITE WAVE HEIGHT INPUT

2 6Pl-14 #22 BLACK o VOLT RETURN

3 6PI-5 #26 WHITE OUTPUT BATTERY MONITOR

4 6PI-6 #22 BLACK o VOLT RETURN

5 TB4-3 #26 WHITE COS INPUT SI GNAL

6 TB4-1 #26 WHITE SINE INPUT SIGNAL

7 6Pl-l #26 WHITE SINE OUTPUT SIGNAL

B 6PI-3 #26 WHITE COS OUTPUT SIGNAL

9 6P2-13 #22 ORANGE +15 VOLTS REGULATED

10 6P2-19 #22 BLUE -15 VOLTS REGULATED ~

11 6P2-2 #26 WHITE VCO CAL COMMAND

12 6P2-1 #26 WHITE VCO CAL VOLTAGE

13 6PI-25 #26 WHITE COMMAND RETRANSMIT

14 3P3-4 #26 WHITE WRN-ON COMMAND

15 3P3-5 #22 YELLOW +27 VOLTS

16 3P3-17 #22 YELLOW +36 VOLTS BATTERY

17 3P3-B #22 YELLOW/WHITE +27 VOLTS COVER SUPPLY

IB 3P3-2 #26 WHITE COMl1AND INPUT

19 6P2-25 #22 BLACK o VOLT RETURN (STEPPER)

20 6PI-I0 #22 BLACK o VOLT RETURN

• 21 6PI-12 #22 BLACK o VOLT RETURN

22 TBI-9 #22 RED +27 VOLTS SWITCHED

23 6P2-3 #22 RED +27 VOLTS SWITCHED

24 3P3-1 #22 RED +27 VOLTS SWITCHED

25 2PI-4 #22 RED +27 VOLTS SWITCHED

- 114 -

Appendix B

AIR-SEA TELEMETRY SYSTEM

DECK #5 • 5P1

PIN TO WIRE ALSO TO WIRE DESIGNATION

1

2

3

4 6Pl-22 #22 BLACK o VOLTS RETURN

5 6P2-11 #22 ORANGE +15 VOLTS

6 6P2-17 #22 BLUE -15 VOLTS

7 6P2-::'4 #22 BLACK o VOLT RETURN

8 4P1-1 #26 WHITE COMMAND 11

9 4Pl-2 #26 WHITE COMMAND 12

10 4Pl-3 #26 WHITE COMMAND 13 .'

11 4Pl-4 #26 WHITE COMMAND 14

12 4Pl-5 #26 WHITE COMMAND 15

13 4Pl-6 #26 WHITE COMMAND 16

14 4Pl-7 #26 WHITE COMMAND 17

15 4Pl-8 #26 WHITE COMMAND 18

16 4Pl-9 #26 WHITE COMMAND 19

17 4P1-10 #26 WHITE RESET BANK #1

18 TB2-2 #26 WHITE T.A. SIGNAL #1 o/p LOW

19 TB2-1 #26 WHITE T.A. SIGNAL #1 o/p HIGH

20 6Pl-19 #26 WHITE OUTPUT T.A. AMP #1

21 4Pl-16 #26 WHITE COMMAND 21

22 4Pl-17 #26 WHITE COMMAND 22

23 4Pl-18 #26 WHITE COMMAND 23

24 4Pl-19 #26 WHITE COMMAND 24

25 4Pl-20 #26 vlHITE COMMAND 25

- 115 -

Appendix B

AIR-SEA TELEMETRY SYSTEM

DECK #5

5P2

PIN TO WIRE ALSO TO WIRE DESIGNATION

1 4Pl-21 #26 WHITE COMMAND 26

2 4Pl-22 #26 WHITE COMMAND 27

3 4Pl-23 #26 WHITE COMMAND 28

4 4Pl-24 #26 WHITE COMMAND 29

5 4Pl-25 #26 WHITE RESET BANK #2

6 TB2-4 #26 WHITE o/p T.A. SIGNAL #2 LOW

7 TB2-3 #26 WHITE o/p T.A. SIGNAL #2 HIGH

8 6Pl-21 #26 WHITE O/p T.A. AMP #2

9 4P2-1 #26 WHITE COMMAND 31

10 4P2-2 #26 WHITE COMMAND 32

11 4P2-3 #26 WHITE COMMAND 33

12 4P2-4 #26 WHITE COMMAND 34

13 4P2-5 #26 WHITE COMMAND 35

14 4P2-6 #26 WHITE COMMAND 36

15 4P2-7 #26 WHITE COMMAND 37

16 4P2-8 #26 WHITE COMMAND 38

17 4P2-9 #26 WHITE COMMAND 39

18 4P2-10 #26 WHITE RESET BANK #3

19 TB2-6 #26 WHITE O/p T.A. SIGNAL #3 LOW

20 TB2-5 #26 WHITE Olp T.A. SIGNAL #3 HIGH

21 6Pl-23 #26 WHITE OUTPUT T.A. AMP #3 "

22 4P2-14 #26 WHITE COMMAND 40

23 4P2-11 #26 WHITE COMMAND 41

24 4P2-12 #26 WHITE COMMAND 42

25 4P2-13 #26 WHITE COMMAND 43

- 116 -

Appendix B

AIR-SEA TELEMETRY SYSTEM

DECK #6

6Pl

PIN TO WIRE ALSO TO WIRE DESIGNATION

1 4P3-7 #26 vlHITE INPUT SINE SIGNAL

2 TB4-2 #22 BLACK o VOLT RETURN

3 4P3-8 #26 WHITE INPUT COS SIGNAL

4 3P3-19 #22 BLACK o VOLT RETURN

5 4P3-3 #26 WHITE OUTPUT BATTERY MONITOR

6 4P3-4 #22 BLACK o VOLT RETURN

7 4P2-23 #26 WHITE SPARE WAVE HEIGHT SIGNAL

8

9 TBI-5 #26 WHITE INPUT STRAIN GAUGE #1 v

10 4P3-20 #22 BLACK o VOLT REI'URN

11 TBI-6 #26 WHITE INPUT STRAIN GAUGE #2

12 4P3-21 #22 BLACK o VOLT RETURN

13 TBI-7 #26 WHITE INPUT STRAIN GAUGE #3

14 4P3-2 #22 BLACK o VOLT RETURN

15 TBI-8 #26 WHITE INPUT STRAIN GAUGE #4

16 TB4-6 #23 BLACK o VOLT RETURN

17 2PI-7 #26 WHITE TEMPERATURE

18 2PI-6 #.22 BLACK o VOLT RETURN

19 5PI-20 #26 WHITE lip FROM T.A. AMP #1

20 2PI-3 #22 BLACK o VOLT RETURN

21 5P2-8 #26 WHITE lip FROM T.A. AMP #2

22 5PI-4 #22 BLACK o VOLT RETURN

23 5P2-21 #26 WHITE liP FROM T.A. AMP #3

24 3P3-3 #22 BLACK o VOLT RETURN

25 4P3-31 #26 WHITE COMMAND RETRANSMIT

-; 117-

AEpendix B

AIR-SEA TELEMETRY SYSTEM

DECK #6

6P2

PIN TO WIRE ALSO TO WIRE DESIGNATION

1 4P3-12 #26 WHITE CAL VOLT INPUT

2 4P3-11 #26 WHITE CAL COMMAND

3 4P3-23 #22 RED +27 VOLTS SWITCHED

4 SPARE

5 TB2-7 #22 GREEN +6 VOLTS REGULATED

6 TB3-6 #26 WHITE MULTIPLEXED TONES

7 TB3-5 #22 BLACK o VOLT RETURN

8 TEl-II #22 VIOLET -20 VOLTS

9 2Pl-5 #22 VIOLET -20 VOLTS

10 TB3-10 #22 ORANGE +15 VOLTS REGULATED

11 5Pl-5 #22 ORANGE +15 VOLTS REGULATED

12 4P2-22 #22 ORANGE +15 VOLTS REGULATED

13 4P3-9 #22 ORANGE +15 VOLTS REGULATED

k4 2Pl-l #22 ORAliGE +15 VOLTS REGULATED

15 3P3-14 #22 RED/WHITE +25.5 VOLTS REGULATED

16 TB3-8 #22 BLUE -15 VOLTS REGULATED

17 5Pl-6 #22 BLUE -15 VOLTS REGULATED

18 4P2-21 #22 BLUE -15 VOLTS REGULATED

19 4P3-10 #22 BLUE -15 VOLTS REGULATED

20 2Pl-2 #22 BLUE -15 VOLTS REGULATED

21 TBI-IO #22 BLACK 0 VOLTS RETURN

22 TB2-8 #22 BLACK 0 VOLTS RETURN

23 SPARE

24 5Pl-7 #22 BLACK o VOLTS RETURN

25 4P3-19 #22 BLACK o VOLTS RETURN

Appendix B

AIR-SEA TELEMETRY SYS'I'EN

DECK #6

- 118 -

6P3 50 n COAXIAL CONNECTOR BNC MALE

TO WIRE

1P10 RG58ju

DESIGNATION

TRANSMITTER OUTPUT

}