AD-AO16 937

RADIO SET AN/PRC-70 ()

C. A. Bucher

Cincinnati Electronics Corporation

Prepared for:

Army Electronics Command

August 1975I

DISTRIBUTED BY: "1

National Technical Information ServiceU. S. DEPARTMENT OF COMMERCE

I l l I I II ll l i I I I l I

DISCLAIMER NOTICE

THIS DOCUMENT IS BEST QUALITYPRACTICABLE. THE COPY FURNISHEDTO DTIC CONTAINED A SIGNIFICANTNUMBER OF PAGES WHICH DO NOTREPRODUCE LEGIBLY. "

318106

80045-PRC41/875

LAD

"RESEARCH AND DEVELOPMENT

,- TECHNICAL REPORT"LW • ECOM-0319-9

RADIO SET AN/PRC-70 H

"NINTH QUARTERLY REPORT

0 1

: ~~~AUGUST 1975, .;

Approved for p)ublic release;

60

i C,/OMU.$. ARMY ELECTRONICS COMMAND. FORT MONMOU'TH, N.J.CONTRAcTr OAASO7-71.-C-O31g

CINCINNATI ELECTRONICS II ' ", r ........- r'0f v -doll. (Fl3UCI fll

CO krO RATIO N ,•,,, •,•,•,,,,,[,,.,,

NATIONAL TECHNICALINFORMATION SERVICE

us tinarltmamn of Comm""tc

SV

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U NC LA SSIFIFIE)______

DOCUMENT CONTROL DATA -R L D

I 011IQ4aA TINI4 ACIVu? Y (Calpabfle oulftee) 9l, PIRPORI ItCUJft1 TV CLA66UIVICATION

Cincinnati Electronics CorporationI r-2630 Glendaile-Mfiford Rond . "IP

Clininai.Ohio 454

Radio Set AN./PRC-7O(4. OgICRIP, iVWy Noa O VE S ( typ rfeport sold IMctullve doesl)

Ninth Quarterly Report - 1 January 1975 to 31 March 1975I A U THORlaI a (Filts nlame, M111014 in#ifoal, Alat memo)

C. A. B~ucher*- Npa"O? *ATa is. TOTAL No. OF PAGESI 76 No. op maps

Auus 1975I& COTRAS oft omPttN7 P40 ORIGINATON'a mAtROA NUMOCRIMia

DAAJ3O7-71-C-0319 805PI4/7I, NjKCT NO 04-ai4/7

186-67401-D-533-01 S 'UmPN OS ~yol~ sh, a * ea.ee

ECQM-0319-9

Approved for public release; distribution unlimitedIISUPPLCMIENTANY NOTEG I SPONSORINS MILITARY A'CTIViTY-

U. S. Army Electronics CommandIFt. Monmouth, Now Jersey 07703jA MSEL- NL- E-4

This report covers the quarterly interval from 1 Jamnury 1,975 through 31 March 1975,The effort expended during this period was mainly directed toward the QualificationTests of the equipments.

DD I NV $14 73 UNCLASSIFIEDsecuPltv clafleiriation

UNCLASSIFIED. ecurit nle llefleiel

'4 KEhY "*No LINK A LaNK CNEly W@lOWUC ,,,- -

Ai "06m NOl" W6

HF/VHF fladio Tuner, SynthesizerPower Amplifier

st

UNCLASSIFIEDkci.'IW Ctla.elf.los.o

TR- ECOM-0319-9 Reports Control SymbolAugust 1975 OSD-1366

RADIO SETAN/PRC-70

NINTH QUARTERLY REPORT1 Janmary 1975 to 31 March 1975

CONTRACT NO. DAABOV-71-C-0319

DA PROJECT NO.IS6-674701-D-636-01

DISTRIBUTION STATEMENT

Approved for public release;distribution unlimited

Prepared byC. A. Bucher

Cincinnati Electronics CorporationCincinnati, Ohio 45241

Successor by Purchnaseof the nwertnle Operation

of the Avco/Electronic s Division

FOR

U.S. ARMY ELECTRONICS COMMAND, FORT MONMOUTH, N.J.

ABSTRACT

This report covers the quarterly interval from 1 January 1975 through 31 March 1975.The effort expended during this period was mainly directed toward the QualiflcatlonTests of the equipments.

K'.ti P

-,11

'II

TABLE OF CONTENTS

Section Title Page

1.0 SYSTEM STATUS . ... .. . . ......... ... .....1.1 SYSTEM TESTS ....... .......... 11.1.1 Input Power ...... ........................1.1.2 Power Output .......... . .... . .... 1I1.1 3 Sensitivity .. . . . . .. . . . .

1.1.4 Antenna Matching .... ...................... .. .. .33

1.1.5 Desensitization ........... ........ .I . . . I ... . I .. 331.1.6 Wideband Delay . . . . . . .... . .. ... ....... .. 33

1.1.7 GRA-71 Operation ... . . .. .... ...... .... 4.01 .1.8 CW Mode Operation ............................. 402.0 SYSTEM TESTS (ENVIRONMENTAL) ................. 402, 1 TEMPERATURE TESTS ...... ... . . . ... . . 402)2 FUNGUS9) 402.3 HUMIDITY .. . . . . . . . . . . e # s . a e 402.4 SALT FOG .... ..... . .... 592.5 VEHICULAR BOUNCE .............. .s 592. 6 DROP TEST .......... ..... ....... s .. . 59

MEC AN CA ........ . . . . . . . .... . . . . . .. 5

4,0 MODULE STATUS ..... ... .. ..... .. . . . 59

4.1 ANCILLARY ITEMS .................... s 60

LIST OF ILLUSTRATIONS

Figure, Title Page

1. Input Curront vs. Frequoncy - PRC-70 S/N 1 ......... 22. Input Current vs. Frequency - PR-70 SN 2 ....... 33. InpuL Current vs. Frequency - PRC-70 S/N 3.. ...... 44. Input Current vs. Frequency - PRC-70 S/N 4 ............ 55. Input Current vs. Frequency - PRC-70 S/N 5. 66. Input Current vs. Frequency - PRC-70 S/N 6 . .... .... 77. Transmit Power (Out) vs. Frequency S/N 1 ..... 88. Transmit Power (Cut) vs. Frequency S/N 2 .... .......... 99. Transmit Power (Out) vi. Frequency S/N 3 .............. 10

10. Transmit Power (Out) vs. Frequency S/N 4 ........... 11

Iii

LIST OF ILLUSTRATIONS - C(ONT

Figure Tith. Page

11. Transmit Power (Out) vs. Frequency S/N 5 ............. 1212. Transmit Power (Out) vs. Frequency S /N ............... 1313. Sensitivity vs. Frteluency S/N 1 (SSB, CW, FSK, AME, FM) . . 1.414. Sensitivity vs. Frequency S/N 2 (SSB, CW, FbK, AME, FM) . 1515. Sensitivity vs. Frequency S/N 3 (SSB, CW, FSK, AME, FM) ... 1616. SensitivitN vs. Frequency S/N 4 (SSB, CW, FSK, AME, FM) . . . 1.717. Sensitivity vs. Frequency S/N 5 (SSB, CW, FSK, AME, FM) . . . 1818. Sensitivity vs. Frequency S/N (i (SSB, CW, FSK, AME, FM) . . . 1919. Sensitivity vs. Frequency S/N H and 9 (SSB, CW, FSK)

2 to 10 MJHz ........ ....... ........ * * 2020. Sensitivity vs. Frequency S/N 8 and 9 (SSB, CW, FSK)

10 to 20 MHz .......... ........ . , . . . t . # . . . . . 21

21. Sensitivity vs. Frequency S/N 9 and 9 (SSB, CW, FSK)20 to 30 M lfz . ....... .. .. .. 6 * 4 . . . .......... .. 22

22. Sensitivity vs. Frequency S /N 9 and 9 (8813, CW, FSK):10 to 40 M~tz ... . . . . . . . . . .... . ... .. . 23

23. Sensitivity vs. Frequency S/N 8 and 9 (SSB, CW, FSK)40 to 50 MHz . . ................... ....... 24

24. Sensitivity vs. Frequency S/N 8 and 9 (SSB, CW, FSK)60 to 60 M H z . . . . . .... . . . . . . . . . . . 25

25. Sensitivity vs. Frequency S/N 8 anl 9 (SSB, CW, FSK)60 to 70 MHz ......... ...................... 20

26. Sensitivity vs. Frequency S/N 8 and 9 (SSB, CW, FSK)70 to 76 i t Hz .. . . .. .. . ... ...r.. 0t.0... ...... 27

27. Sensitivity vs. Frequency S/N 8 and 9 (FM) 30 to 40 MRz. . . . . 2828. Sensitivity vs. Frequency S/N 8 and 9 (FM) 40 to 50 Mlz. . . . . 2929. Sensitivity vs. Frequency S/N 8 and 9 (FM) 50 to 70 M1z. . . . . 30.30. Sensitivity vs. Freqjuency SIN 8 and 9 (FM) 60 to 70 Milz. ..... 31

31. Sensitivity vs. Frequency S/N 8 and 9 (FM) 70 to 70 MiHz...... 3232. AN/PRC-70 Desensitization Data ... . .. of 1 . . 4 . 363•3. Absolute Delay vs. Modulating Frequency ............ . 3734. Transmit Power (Out) vs. Frequency S/N 13 at -50'C, S/N 5

at ambient 5'C, S/N 5 at -65^C ,........... . . . 0 . . . . . . 4435. Transmit Power (Out) vs. Frequency SSB Hitgh Power ........ 4536. Transmit Power (Ouit) vs. Tomperature - 2.051 MHz &

26.428 MHz .............. .......... . .. .. .. 4(037. Transmit Power (Out) vs. Frequency - DC Inputs of 20V, 24V

& 32V at -65"C . . . . . . . . . . . . . . . .. 47

38. Transmit Power (Out) vs. Frequency - S/N 5 at -409F, 24V . . .. 4839. Transmit Power (Out) vs. Frequency - Hot (160 0F) . . . ....... 4940. Transmit Power (Out) vs. Frequency - S/N 1, +24 VDC, -50 ,F. 50

iv

LIS'i OF ILLUSTRATIONS - CONT

Figure Title Page

41. Transmit Power (Out) vs Frequency - S/N 5, *24 VDC, -500F. . . 51

42. Transmit Power (Out) vs. Frequency - +24 VDC, 160'F ........ 52

43. Transmit Power (Out) vs. Frequency - S/N 13, +24 VDC,-50'F ..... ................................... 53

44. Transmit Power (Out) vs. Frequency - S/N 12, +24 VDC,-50 "'F . . . . . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54

45. Transmit Power (Out) vs. Frequency - S/N 10, +24 VDC ....... 56

46. Transmit Power (Out) vs. Temperature .............. 56

47. Sensitivity vs. Frequency tt 4160F .................... . 57

48. Sensitivity vs. Temperature .......................... 58

LIST OF TABLES

Table Title Page

1. Antennn Matching (Whip Antennas) ..................... 34

2. System Response vs. Pulse Repetitinn Rate ....... # I . 4 . .... . 38

3. Operation of the GRA-71 Between Two AN/PRC-70 Radio Sets.... 41

v/(vi blank)

1.0 SYSTEM STATUS

The ET/ST Systems have been fabricated and Acceptance Testing hasbeen completed. While the Acceptance Test units are being rtfurbishcd,the Reliability Automatic Test Set is being debugged.

1.1 SYSTEM TESTS

The following data has been accummulated on the 21 ET/ST Systems.The data was taken according to the Acceptance Test procedure at rourmtemperature. Although much more data has been accumulated duringthis period, only the more significant or improved data is being indicated,

1.1,1 Input Power

Figures 1 through 61 are graphs showing the input current required versusfrequency for the various systems and modes of operation and for thenomenclatured systems. All data was taken at +24 VDC. The power datais the current required to deliver approximately 30 watts of RF power toa 50 ohm load. The lower power mode (3 watts) and the receiver datawas taken in CW mode. Maximum input power required is 160 wattsIn CV mode at the low end of the frequency range (2 - 4 MHz) where theoutput RF power is close to 40 watts, The typical power required is130 watts.

1. 1.2 Power Output

Figures 7 through 12 show the transmit power output for the indicatedmodos of operation. In general, the power output averages very closeto 30 watts with maximum power at the lower end of the frequency rangeand minimum power at 35 MHz. The variation in power is due primarilyto two factors: 1) the gain of the ALC loop and, 2) the presence or lackof losses in the antenna coupler. As indicated on the charts, the AMEpower is low due to the set-up in the ALC module for AME mode. Theproblem has been resolved and the units now run identical to SSB 2-toneoperation,

1.1.3 Sensitivity

Figures 13 through 31 show the output S + N + D/ N + D for input signalsas shown below:

SSB, CW, FSK - .5 1V (2 - 20 MHz)-- 375 (20 - '76 MHz)

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32

AME 2.51LV (2 - 20 MHz)1.95 I.V (20 - 76 MHz)(30% mod. at 1 kHz)

FM 0 .6 V (30 - 76 MHz)(8 kHz dev. at 1 kHz)

These plots indicate that the sensitivity is marginal below 3. 0 MHz. Thisproblem is due to power supply spurious being injected into the antennacoupler input.

During the quarter, effort was made in this area and, by minor changes inthe egg-crate/case grounding techniques, the problem has been almosteliminated. This correction has been incorporated into all systems.

1.1.4 Antenna Matching

During this quarter, much effort was directed toward solving problemsin the remaining antenna match areas. These were, in particular, theinability of the system to tune a 15-foot whip below 3. 0 MHz, and variousfrequency "holes" when using the long wire. Modifications were madewith the addition of a transformer to use with the long wire antenna whichlinks the impedance to 1000 ohms, and a logic change to the 15-foot whip.These changes have been incorporated Into all systems. Table 1 showsthe matching capability of the 21 ET/ST systems as measured in actualantennas. These measurements were made approximately 300 feet fromary large building at Cincinnati Electronics with the equipment set onthe ground.

1.1.5 Desensitization

Figure 32 shows the typical desensitization of the A N/PRC-70 Radio Set,The measurement was made by obtaining a 26 db signal-to-noise ratio at

the desired signal and increasing the interfering signal until this outputsignal-to-noise was degraded by 6 dB.

1.1.6 Wtdeband Delay

Figure 33 shows the absolute delay of a total system operating in widebttndmode (one AN/PRC-70 transmitting and one AN/PRC-70 receivivhg), Thephotos in Table 2 show the response of the system at various repetitionrates,

33

TABILE 1. AYF'rlNNA MATICII1ING

F, e(jtuflicY Long Wirt'(OM l1z) 6 Foot Whip (1 Foot Whipl 15 Foot Whip Doublet Ant 30O Foot

:3. 0 Y y

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TABLE 1. ANTENNA MATCHING - CONT

Frequency Long Wire(MHz) 6 Foot Whip 9 Foot Whip 15 Foot Whip Doublet Ant 300 Foot

38.0 Y Y39.0 Y Y40.0 Y Y41.0 Y Y,42.0 Y Y43.0 Y Y44.0 Y Y45.0 Y Y46.0 Y Y47.0 Y Y48.0 Y Y49.0 Y Y50.0 Y Y51.0 Y Y52.0 Y Y53.0 Y Y54.0o Y Y55.0 Y Y56.0 Y Y57.0 Y Y58.0 Y Y59.0 Y Y60.0 Y Y61.0 Y Y62.0 Y Y63.0 Y Y64.0 Y Y65.0 Y Y66. 0 Y Y67.0 Y Y68.0 Y Y67.0 Y Y70.0 Y Y71.0 Y Y72.0 Y Y

73.0 Y Y74.0 Y Y75.0 Y Y76.0 Y Y

35

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1.1.7 GRA-71 Operation

The photos in Table 3 show the operation of the GRA-71 between two AN/PRC-70 radio equipments, The key line is the output of the GRA-71 enter-ing Radio A; the RF output Is that of Radio A which enters Radio B antennaport; the audio output is that of Radio B which enters the decode device orthe GSH-6.

Tests were also conducted to verify the operation of the GRA-71 in con-junction with the GSH-6.

1.1.8 CW Mode Operation

During this quarter, a problem was uncovered in the turn-around time ofthe AN/PRC-70 when operating in CW mode. The problem was that thefirst character may not be transmitted when starting a message, Thiswas due to a receive-to-transmit turn-around of 100 milliseconds. Uponinvestigation it was found that a transient was getting into the transmitaudio section and shutting off an operational amplifier for this period.Filtering was added to the power line plus a minor revision of the switch-ing to alleviate this problem. The turn-around time is now being mea-sured at less than 5 milliseconds which is more than sufficient to meetthe operational requiremenit.

2.0 SYSTEM TESTS (ENVIRONMENTAL)

The following environmental tests have been completed.

2.1 TEMPERATURE TESTS

Figures 34 to 48 show the typical power output and sensitivity being sohi.eyed while operating over temperature extremes.

2.2 FUNGUS

Fungus testing has been completed. The only identifiable growth wasnoted on the rubber protective caps tised on the 2-wire antenna input con-nector. No corrective action is planned.

2.3 HUMIDITY

Humidity testing has been completed, The unit performed satisfactorilyduring this test. A problem developed where excessive pitting of the con-formal coating was observed on all modules. Investigation has shown thatthis phenomenon occurs when proper cleaning is not accomplished be-fore coating. Corrective action will be taken on all future systems.

40

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2.4 SALT FOG

The Salt Fog Test has been completed with no detrimental effects.

2.5 VEHICULAR BOUNCE

Two units have been subjected to and have passed the Vehicular BounceTest.

2.6 DROP TEST

Unit No, 6 has been subjected to the Drop Test. The system failed inthe following areas:

1. Extensive movement and banding of the "egg-crate".2. Coils broken in the power supply.3. Coils br,,)1 en in the antenna coupler.

Corrective action was taken on Serial No. 7. These corrective actionsconsisted of:

1. Additional fasteners added to hold egg-crate to the case and

top cover.

2. Tie downs added to the power supply coils.

3. Change in material of the screws holding the antenna couplerin place.

The above corrective actions were incorporated into Unit No, 7 whichwas again subjected to the Drop Test.

The corrective actions are considered adequate to enable compliancewith the Drop Test requirement,

3.0 MECHANICAL

The weight reduction effort has been completed, All drawings have beenupdated for the procurement package.

4.0 MODULE STATUS

All modules have been completud. The only changes added were to cor-

rect MIL-STD-275 deficiencies.

59

4.1 ANCILLARY ITEMS

All Aneillnrv Itenms are in-house and being rendied for shipment.

(60