8/12/2019 A 10 Dollar Phone Patch

1/2

l Danzer NI I I

Dawn Road

CT 06857

10

Phone

Pa

u don't have to spend shown, no effect from rf tion shown by the dotted

40 to 90 for a phone

feedback has been experi-

line.

to match new

ate performance with

s purchased at your lo-

Radio Shack. For a cost

10 and one eve-

that wil l work with a

tube-tvpe transceiver.

enced, even when used k i t h

a kilowatt.

S 1 i s

a four-pole, two-po-

sition switch (Radio Shack

275-1 384 or equi valent)

used to switch the patch on

and of f. The fourth section

of this switch (Sld) is used

to switch the patch in to the

circuit in place of the usual

S is a DPDT toggle or

lever switch. I t allows you

to select XMlT (transmit) or

RCV (receive) from the

front panel of the patch,

rather than fumbling with

the microphone PTT switch,

telephone handset, and re-

ceiver audio gain control

all at once.

is circuit idr variations of station microphone. If your 52 i s wired in such a way

has been in use by sever- rig has a phone patch input, as to permit operation wi th

hams in this area for a you can leave the mike con-

many types of solid-state

er o f years (see Fig. 1).

nected to its usual jack and

rigs. These rigs often have

th the bypass capacitors use the alternate connec- the novel li tt le problem

OFF

S I C

TO

S I A f O F F

S I B

M I C R O P H O N E

5 0 0 0

T O P H O N E

o X M I T

> T O P T T

THROUGH M IKE

JACK ON RIG1

Fig. 1 Inexpensive phone patch uses readily available components.

8 73 Magazine February, 1981

that the receiver audio is

not cut completely off

while in the transmit mode.

During normal operation

this is not a problem. How-

ever, with many of the usu-

al phone patches, an audio

oscillation will result, with

the phone patch acting as

the oscillator coupling ele-

ment. Switch S2 discon-

nects the receiver audio

from the patch when in the

transmit mode, thus elimi-

nating the prob lem.

The second section of

this switch (S2b) grounds

the PTT line when you wish

to transmit. On a few of the

new rigs, this line is called

MOX rather than PTT. MOX

stands for Manually Oper-

ated Xmit, similar to VOX

-

for Vo ice Operated Xmit.

Impedance matching

IS

provided by TI and 72,

which are den tical 8-Ohm-

to -1000-Ohm (cen te r -

tapped) a u d ~ oransformers

Rad~oShack lists this Itern

as 275-1384 They are not

critical, and any 8-Ohm-to-

1000-Ohm or 8-Ohm-to-500- I

Ohm aud~ oransformer wil l

do Good performance has i

been obta~ned ven w ~ t h

palr of 12-volt f~iament

transformers The 12-volt

secondary IS connected In

place of the 8-Ohm w~nd ing

and the 5-volt primary in

8/12/2019 A 10 Dollar Phone Patch

2/2

e o f t h e 5 0 0- o r

The transmit level is set

ed t o T2. Bypass capac-

put leads t o prevent

A

metal enclo-

fo r the patch is recom-

To use the patch, set

S1

h and

S2

to RCV and

tone) by dialing

in the telephone hand-

nds comfo rtab le in your

set, i t probably is ac-

Next, pu t S2 in the XMlT

the te lephone handset.

Set the 500-Ohm pot so that

the meter on the final in

your rig swings into its nor-

mal area as though you

were using the station mi-

crophone.

There is no provision for

VOX operation. Most hams

prefer manual RX/TX since

it both prevents an opera-

tor's acc identa l sneeze or

cough from turning on the

transmitter and allows you

to c ut of f the speaker if he

or she attempts t o say

something inappropr iate

for transmission over your

station.

One tip on phone patch

use- fo r some reason,

when you tell someone on

the telephone t o talk loud-

er, they w il l do so for a few

minutes and then lapse

back to their orginal vol-

ume. However, if you turn

the audio gain contro l

down so that they hear the

other station more softly,

they w i l l au tomat ica l l y

speak up as though to com-

pensate..

just like adding

a

10-watt amp

to your 2-meter hand-held

...

True a wave gain antenna

Dram atically boosts reception as well

as transmit range

@ individually tuned m atching network

e Base spring/tuned coil protects radio as

well as antenna from accidents

Extends to

47 ,

elescopes to only

8

B N C connector fits most current hand-

held and portable radios

Better than

1.5:l

VSWR across the

entire 144-148

MHz

band

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Ask about our

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1

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For those who wtsh to mount the encoder in a hand held un t the PC board

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ACCUK~VE~KIT) Tn S ACCuKEYER IS

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CLOCK CASE

Available

and

will

fit any one of the above clocks Reguiar

Prlce

6 50 But

Only 14.50

when

bouxht with

clock

YX-DIGIT ALARM CLOCK KIT fo r home, camper, RV , or fi eld- day use Oper ate s

on 12-volt AC or DC, and h as 11sown 60-Hz tlme base on the board Complete

with all

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slze

4 x

3

Complete wlth speaker and sw~t che s t operated on DC, there 1s

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PllCED AT .......................

................................

16.95

Twelve-volt AC llne cord lor those who w ~ s ho operate the clock from 110-volt

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SHIPPING INFORMATION

ORDERS OVER

7 0 0

WILL BE SHIPPED POSTPAID EXCEPT ON ITEMS

WHERE ADDITIONAL CHARGES ARE REQUESTED

ON ORDERS LESS THAN

$2000 PLEASE INCLUDE ADDITIONAL $1 50 FOR HANDL ING AND MA ILI NG

CHARGES SEND SASE FOR FREE FLYER

rn

\\

P. BOX 1101

SOUTHGATE,

MlCH

48195

HAmD C, NOWLAND

PHONE

(313)

285.1

782

Reader Service-see pa ge

146

73 agazine e

February, 1981

69