Military Surplus rigs AN-PRC-6 Service guide

DEPARTMENT

OF

THE

ARMY

TECHNICAL

MANUAL

RADIO

SET

AN/PRC-6

OPERATION

ORGANIZATIONAL

MAINTENANCE

AND

.

DEPARTMENT

AGO 1426A-

Sept

OF THE

ARMY

• SEPTEMBER

1955

CONDENSED

OR

RADIO

SET

OPERATING

AN/PRC-6

INSTRUCTIONS

(HANDlE-

TALKIE)

VOLUME

knob

VALVE

TO

RECEIVE

1.

2.

3. Turn switch

4,

TO

SEND

5 Before sending, listen

6.

7,

a.

TO

USE

9.

10.

Screw

antenna into connector

Open

AIR

Hoi

d handie-tolkie

VOLUME
noise decreases

· p

ss

PUSH-

re

Handie-talkie
Keep

your

own

voice (sidetone)

When

you

VALVE

to

are

(turn

marked
get hissing noise

TO-TALK

is

lips close

through

to

EXT.-OFF-INT.

with

earphone

when

voice signals

to
button

now

in

"sen " con

to

in

earphone.

talking, release

make

microphone;

HANDSET

Plug handset cord into

Follow operating instructions t

o.

In

step 3 turn switch

Use

b.

handset push-to-to

connelto\

on

top

left). . .

d

of case.

to

INT.

and

to

your

in

sure

on

handie-talk1e

rkoudg

mar

1 k · h h d t earphone

sw1tc 1 an

ear (see illustration above). Adjust

earphone. Handie·talkie

ore

received.

no

one.

d'

.

1t1on.

t'alk

PUSH-TO-TALK

on

ta~die-talki:·

EX'T

e

walt a

I

e se

and

in

normal

eOxcFeFpi:NT t EXT

••

• • • o

se

m1nute

• .. h • "

IS

o~

hold

1t

tone.

button and 1sten

1

for

tubes

is

now

in

t. e

01r..

. •

m.

H1ss1ng

While

talking,

•

1

..

and

handset microphone.

to

warm

up.

knob

"receive"

noise

you

f . . 1

or

condition;

will

stop.

will

hear

onswerang

marked

your

s1gno

s.

TO

AGO 1426A

TURN

11. Turn ha1die-talkie switch

12. Close

SET

AIR

VALVE

OFF

(turn

marked

to

Condensed Ope1·ating Inst1·uctions

right).

EXT

.-OFF-INT •

to

OFF.

TM

296·201

*

TM

11-296

TECHNICAL MANUAL }

No. 11-296

CHAPTER

Section

CHAPTER

Section

CHAPTER

•

This mnnunl super

RADIO

1.

2.

3.

I.

II.

4.

I.

II.

III.

SET

DESCRIPTION
Scope _______________________________________________________________________ _

Description
U se of radio
Operating

Packaging

of

Table
Additional equipm

Auxiliary

Nomenclature and common names _____________________________________

PREPARATION

Unpacking
Controls

Tuning
OPERATION

Procedure of
Installation

To receive and to send (handie-talkie)
To receive
Removal and in
U se

Field
Siting

Operation
Antijamming

PREVENTIVE
Preventiv
Gene

Ech

Operator's pr
Operator's maint

Operator's precautions ________________________________________________________ _
Use

Org
Organizational

Preventive

5.

TROUBLESHOOTING
General

Equipment
Tube replacemenL

Organizational

Visual

Res
Operational

6.

LIMITED

Limit
Demolition to pre

compon e

and

Radio

of

adjustab

ope

ration

and

ral

-----------------------------------------

€lons

of

preventive maint

anizational

--------------------------------------

inspection _____________________________________________________________ _

istance check at

ed s

sedes

TM

DEPARTMENT

AN/PRC-6,

AND

DATA

of

Radio

Set

seL

----

-----

characteristics

data

_________________

nts

for

ent

r€quired _________

equipment_ _____

FOR

USE

and

checking equipment_

their

uses ______________________________ _________________________ _

Set

AN /PRC-6 using

WASHINGTON

OPERATION AND ORGANIZATIONAL MAINTENANCE

AN

/PRC-6

------------------------

------------------------------------------------------·

Radio

·--------------

----------------

____

____________

Set

AN /PRC-6

____

------------------

____

______________

Channel Alinement

---

-----

___

__________________________ _

----------------------------------

____________________________________ _

___

Indicator

25,

D.

-----

-------

-----------

------------------------

-

-------------------

______________________ _

ID-292/PRC-6

operation.

of

whip

anwnna

and

to send

stallation
le s

traP

procedur€s.

camouflage ___________

in arctic, tropical,

procedure _________

from

(handset)

of

Battery

------

---------------

and

(and

return

ed to) stored position _______________ _

-----------

-----

------------------------

-----------------------------------------------­BA-270/U

____

__________________________________________ _

dese

rt

climates

---------

-----------

----

----------------

___

______________________________ _

--------------------

---

-------------------

---------------·

--

---

------------

MAINTENANCE

e ma

intenance

of

preventive

for Radio

maintenance

Set

AN I

PRC-6.

_______________

-

----------------------------

___

__________________________ _

eventive maintenance.

enance check list_ _____________________________________ ________ _

enance

form

____________________________________________ _

preventive
maintenance procedure

mainten

available

---------------------

troubleshooting procedure _______________________________________ _

troubl

eshooting test_ _____________________________________________

STORAGE

torag€

-------------------------------------------------­vent

11-296,

16

maint

€nance.

___

_________________________

ance form __________________________

AT

ORGANIZATIONAL

at

organizationall€veL

LEVEL

----

________

-----------

___

______________________

___

______________________ _

___

-----

---------------------------------------·

battery

plug ______________________

AND

DEMOLITION

TO

PREVENT

___

_______________________ _

ENEMY

USE

enemy us€ _______________________________________________ _

October 1951,

including

C 1,

21

November

1951, C 2,

30

January

OF

THE

C.,

15

Septemb

--

___

______ _

____

---

___________ _

__

--------

-

----------

----

1953. C 4,

ARMY

Pam

--

_

--

_

__

_

--

16

er

1955

grap

h

1 3
2
3
4 4

5 6

6
7
8

9

10

11

12

13
14
15

16
17

18
19
18

21

22

23
24
25

26
27

28

29

30

31
32
33
34

35
36

September

Page

3
4

7
7
8
8

11
11

12

13
13

19
19
22

30
30
30

32
3'2

32
32
32

34
36

37
37
3'7
39
39

39
39

43

43

1954.

AGO 1426A

Figtw

·e

1. Radio Set

AN/PRC-6

TM

296

- 1651

.

2

AGO 1426A

CHAPTER

1

DESCRIPTION

1.

Scope

This technical manual

PRC-6 (fig. 1) contains instructions for opera-

tors and organizational repairmen.

a.

Operator's Instructions. Complete instruc-

tions

for

the

operator

chapters:

(1)

Operation-chapter

(2) Operator's (first echelon) preventive

maintenance-paragraphs

25.

b.

Or·ganizational Maintenance. Instructions

the

in

following chapters

repairmen only :

(1) Description and
(2)

Preparation

(3) Preventive maintenance (second ech-

elon)-paragraphs

( 4) Troubleshooting

-chapter

Not

e.

Field

Maintenance instructions

Radio Set

Set

AN /PRC

AN

/PRC-6

c.

Comments on this publication should be

Field

forwarded directly
The Signal
Monmouth,

Corps PublicaJtions Agency,

N.J.,

5.

- 6 al'€ covered
Maintenance.

to:

ATTN: Standards Branch.

2. Description of Radio Set

(fig. 2)

Radio Set AN I

PRC-6

portable radio set used for voice communic

short

over
the

radio set are Radio Receiver-Transmitter

RT-196

(fig.

distances. The

(*)

I

PRC-6

2).

The radio receiver-transmitter may be

and Handset H-33

operated without the handset. Battery
270

IU is required for operation
component of Radio Set
separately.

Note.

refers

Throughout

to

Handset

this

H-33C/PT

on

Radio Set AN I

are

given in

the

following

3.

21

through

are

for authorized

data-chapt

for use-c

26

at

organizational level

in

TM 11--4069, Radio

hapter

and

27.

and

er

2.

theory

Commanding Officer,

ANIPRC-6

is a 13-tube, low-power,

major

ANI

manual,

or

components of

burt

PRC-6;

Handset

H-33D/PT;

(*)

is not a

it

is issued

H-33

and

1.

Fort

at

I

BA-

C')

Radio

ion

PT

/PT

AND

Receiver-Trans
Radio
196A/
internal
me
organizational
same.

PRC

RT-196

a handie-talki

(fig. 2) and may be held in

DATA

mitter

Receiver-Transmitter

PRC-6. The differenc

differences. The different models

nts

are similar

maintenance

a.

Radio R

- 6 (fig.

(*)

ece

3).

I

PRC-6

e.

RT-196(*)/PRC-6

in

appearance,

iver

-Transmitt

Radio Receiver-Transmitter

is commonly

It

resembles a hand telephone

RT-196/ PRC--6

es

in models

and

the

of

the

equ

ipments

er

RT-196

referred

either

operation

operating. The handie-talkie consists of a re­ceiver-transmitter chassis with vacuum
a cover or shield

for

the

receiver-transmitter

chassis; a microphone and earphone (fig. 2) ; a

flexible steel whip (vertical)

antenna;
two-piece cast-magnesium case held together by
four

lever-type latches (two on each side of
case). The receiver-transmitter chassis,
microphone and earphone, and

battery
case. All operating controls of

of

are mounted

are contained within

on

the
the antenna is being used,
connector on the outside
antenna is not in use,
case (A,
tached to
can use
or

sling for carrying

fig.

14). An adjustable

the

outside of the case. The operator

the

adjustable

outside of the case . When

it

strap
the

the

space for

the

the

handie-talkie

it

is mounted to a

of'

the

case. When

is wrapped around

strap

as a shoulder

handie-talkie on his
back (fig. 1) or for additional hand
when operating

b.

Handset

ta

lkie may be operated without the handset;

handset pel'mits

the

H-33

the

handie-talkie (fig. 22).

(*)

I

PT

(fig.

2).

The handie-

operator to use the radio

set when the handie-talkie is carried

1).

(fig.
and an
plastic case;
the end. When
connected to a connector on

The handset consists of a microphone

earphom• contained within a molded

and· a 5-foot cable with a plug on

the

handset is use

the

d,

case of

han die-talkie.

of

refers

are

the

or

minor

equip-

are

to

to

RT-

and

the

(*) 1

as

hand when

tubes;

and a

the
the
the

magnes ium

the
the

is at-

strap

support

the

on

his back

the plug is

the

AGO 1426A

3

· EARPHONE

3.

Use

(fig. 4)

of

Radio

Fig~we

Set

2. Radio Set

Radio Set AN / PRC-6 is used for voice

munication over short dista

is designed to

se

nd (transmit) or receive fre-

nces. The radio set

quency-modulated (fm) radio signals
one of

within the frequency
cycl
used for

4

43

operating frequencies (channels)

range of

es

(me). The same operating frequency is

transmitting

and receiving. Figure 4

47

to 55.4 mega-

on

com-

any

RADIO
REC

ElVER-

RT-196(*)(PRC-6

AN

/PRC-6,

TRANSI\HTTER

majo1· components.

TM

296-10

lists radio equipments and the operating fre-

that

quencies

system with Radio

4.

Operating

Di

stance range _

Type of radio set_

can be used in a communication

Set AN / PRC-6.

Characteristics

___

Approximately 1 mile.

__ Fm.

Type of communi- Voice.

cation.

Antenna __________ 2-foot flexible steel whip

antenna.

.:.j

9

AGO 1426A

WHIP

ANTENNA

(SHOWN

CON.NECTED)

CHASSIS
SHIELD

Figtwe

8.

Rctdio Receive?·-T?·ansmitte?'

Frequency
Operating fre- Any one of

range

__

47

to 55.4 me.

43

operating

quency. frequencies or channels

(figs. 4 and 12) can

used

for

transmitting

and receiving. Only one

operating frequency can

Crystals required

sed at

be u

__

.A crystal located

a time.

on

ceiver-transmitter chas-

crystal

used to control

AGO 1426A

sis (operating
fig.

10),

is

be

re-

RT-196(*)

TM

296-118

/PRC-6

.

operating frequency of
radio set.
on

43

For

channels,
tals (one for each chan­nel of radio set) are re­quired (par. 7b).
one crystal can be used
a time.

Note. When shipped from

factory, Radio

is tuned

quency
erating

of

frequency is changed,

for

an

51

me. When

Set

operation

43

AN /PRC-6

operating

the

crys-

Only

at

fre-

op-

5

RADIO

SETS

THAT CAN

COMMUNICATE

WITH RADIO

SET

AN/PRC-6

SCR-300

AN/FRC-15
AN/GRC-3
AN/GRC

- 4
AN/GRC­AN/GRC-6

AN/GRC-7
AN/GRC- 8
AN/PRC-10
AN/PRC-16
AN/TRC-22
AN/VRC
AN/VRC­AN/VRC-7
AN/VRC-10
AN/VRC-15
AN/VRC­AN/VRC-22
AN/VRQ-3

5

- 3

6

18

OPERATING FREQUENCY (MC)

IJftlltt.~rtttt.

rtttrrrrttttttf.irrtHrfffrrftif

OR

CHANNEL NUMBER

OF

RADIO

SET

AN/PRC

- 6

"

'

Battery required

Battery

life

_______ Approximately

THE

RADIO
CAN COMMUNICATE WITH RADIO
ON

BLOCKS

EXAMPLE:

SETS

THE

FREQUENCIES

.

RADIO

SET

SCR -

300

6,

4 7.8, AND 48.0 MC.

4 7.

Firture 4. Rad

the 51-mc .

moved

crystal required

erating
mu
new opera

12) . The
tuned
pairman.

___

Battery BA-270 / U (par.

and

frequency;

st

be

only by an a

NOTE:

LISTED

AN/PRC-6

ON

io

crysta

r€placed with the

tuned (alined) to

tin

g f1·equency

rad

IN

THE FIRST COLUMN

INDICATED

ORERATING FREQUENCI

CAN COMMUNICATE WITH RADIO

sets that can co•rnmunicate

l must be re-

for the new op-

the

radio

io s€t mu

uthorized

7a).

10

operat-

ing hours. More

battery
power is used for trans­mitting
ing.
prolonged

than

for receiv-

Batt

ery life can be

if

transmis­sion time is kept to mini­mum.

SET

(par.

st

AN/PRC-6

BY

THE

SHADED

ES

Weig

OF

wit

ht

47.0, 47.

h Radio

of radio

2,

SET

47.4,

Set

AN

I PRC-6.

Approximately 71/2
set (including
batt

set

the

be

re-

tic or oversea shipment . When packaged
domestic shipm ent, the components of the radio

set

a corrugated

ery) .

5.

Packaging

Radio

Data

Set

AN/PRC-6

are adequately cushion

fiberbo

is packaged for domes-

ed

and placed within

ard box. The box is sealed
with paper tape. When packaged
shipm ent, the

adequately cushion

co

mponents of the radio set are

ed

and placed within a

water-resistant corrugated fiberboard box. The

ed

box is seal
contents of the box are

with water-resistant tape. The

li

sted in
The packaged radio set is approximate ly
inches high by

1014

inches wide by

deep.

TM296-IOI

pounds.

for

for

oversea

paragraph 6.

151;2

5%

inches

6

AGO l426A

6. Table of

Components

for Radio

AN/PRC-6

(fig. 5)

'g

.

!:::

6

Dim

l.!

nsi

ons

(in.)

1%x8

%x314

1014x%x

six 5678 tubes, lhr
one
of

3B4

tube. One

the mdio

7%

Crystal Kit

operating frequency

is required when

any

RT-

- 6

re

) I

ht

tube

~z

p::

1

1

set

1

2

(lb)

s consists

tub

e, and

tub

es (13)

14%,x4%,x414

of

Component

Radio Receiver-

Tr

ans

mitt

er

196( *) I

Hand

PT

Complete

spa

Technical ma

n

two
provid

PRC

set H-33(':'

set

of

re tubes"

nual

Total

weig

The set

of

ed

for

each of the

spa

5676 tubes, one 2G21

7. Additional Equipment Required

Battery

of

Radio
is required only when
other
Indicator
radio

BA-270/ U is required

Set AN/

than

PRC-6.

51

me is used. Channel Alignment

ID-292/PRC-6

set is

tuned

(alined) to

an

set

for

Set

I

298

.

...,

"'~

~.:

::~·~

~:0

og

r=

~

I

3%

1

l

lA,

·

A,

;>

42

I 5

ee 5672

tube

spa

re

tube

operation

CK-6/ U

the

of its

43

operating

the

condition of

Note

is changed,
ating

only by an

a.

provic;les

operation of Radio
ages,
at

the

ter

y is used,

loc

ated on

17) is plugg ed into

b.

frequencies;

.

When

the

frequency

a~~th01·ized

Batt

ery

the

+1.5,

-4.5,

battery

the

C1

·ystal

the

battery

the

operating

radio

set

must

(par.

12).

?'e

pai?'"'lnan.

BA-270/

necess

ary

Set AN/

+45,

socket (fig.

the

battery

receiver-transmitter

the

Kit CK- 6/ U (fig.
CK-6/ U consists of 42 crystals
CR-23/ U) in a m

s,
is

ing frequency of
The crystal required

51

me is shipped with,

of

eta

l box: one

the

for

Set AN/ PRC-6. The crystals
two frequencies:
the radio

set

and

the

the
operating frequency is
crystal,
the top of

and

the

the

crystal frequency is

crystal (fig.

it

may

be used to check

(par.

12c).

frequency

be

Th

e radio

U.

Battery

tuned

of

the

to its

set

must

BA-270/ U

new

voltages required

PRC-6;

and

+90,

17).

plug (on

these volt-

are

When

battery

available

chassis .(fig.

battery

socket.

6).

Crystal Kit

(Crystal

for

each operat-

radio

set

an

operating

and

is
are

operating

except

frequency

part

of, Radio

marked

frequency

crystal frequency.

marked

on

the

side

marked

6).

The crystal

radio

oper

be tune d

the

bat-

cable)

Unit

51

me.

with

The

of

fre-

set

-

fo~

of

the

on

AGO

1426A

RAD

IO RECEIVER-TRANSMITTER

RT-196(*)/PRC-6

Figtwe 5.

Rad

io

Set

AN I PRC-6,

J

components.

SPARE
TUBES

TM

296-1

02

7

quency and the operating frequency differ by

4.3 me.

c.

Channel

PRC-6

(fig.

ID-292/PRC-6

Alignment

7).

Channel Alignment Indicator

consists of a meter

Indicator

with

ID-292/

a con-

necting cable and plug and a screw driver. When

the

the radio set is being tuned,

the

test

into
chassis (fig.

socket on

11).
instructions of
given

in

TM 11-5059, Channel Alignment Indi-

ID-292/PRC-6.

cator

8.

Auxiliary Equipment

the

The theory and maintenance

the

alignment indicator

plug is inserted

receiver-transmitter

are

(fig. 8)

Antenna AT-249/GRD is

tenna

used with Radio Set AN

an

auxiliary an-

/PRC-6.

It

is

commonly
antenna
direction of a radio
ing

at
instructions
packed
is used,
nected to
handie-talkie, and

referred

enables

the

same frequency

for

with

the

the

loop

the

loop

to as a loop antenna. This

the

operator

transmitter

the

antenna. When

antenna

antenna

the

screwed into the whip

15).

9.

Nomenclature

To avoid

of

Common

the

repetition of lengthy nomen­clature, common names
the

nomenclature of

to determine

that

as

his radio set. The

use of

the

antenna

the

plug (fig. 8) is con-

connector on

shorting

antenna

are

the

cap (fig. 8) is
connector (fig.

Names

sometimes used

equipments in

the

is operat-

are

antenna

the

for

this

Figttre

8

6.

Crystal

Kit

CK-6/U.

AGO 1426A

Figu1·e 7. Channel

Alig

nment

Indi

cato1·

ID-292/

PRC-6.

manual. The nomenclature and the common

are

as

names used

Nomenclature

Hand

set H-33(*) /
Battery
Radio Set

BA-

AN /PRC-6

with Batte

270/U

ry

follows :

PT

BA-270/U

Hands

Ba

ttery

Radio

Co

mmon name

et

set

Nomenc1ature

Radio Receiv€

ter

RT-196(*)/PRC-6

r-Transmit-

Channel Alignment Indi-

cator

ID-292/PRC-6

Crys

tal

Unit

CR-23/U

Common

Radio

receiver-transmitter

or

han<He-talkie

Alinement

indicator

Crystal

name

AGO 1426A

9

LOOP

PLUG

ANTENNA

Figw·e

8.

Ant

enna AT-2

49/GRD .

TM

:>Cl~-104

10

AGO 1426A

CHAPTER

2

PREPARATION

Note.

Instructions

10. Unpacking and Checking Equipment

a.

Open

the

AN /PRC-6.
manuals,
material
be stored

b.

If

the

dition,

and

for

(par

Inspect

the

equipment is

fill

out

of Damaged

the

to

11. Controls and Their

EXT.-OFF-INT

instructions on

a.

Operating

Control

switch:

EXT.

(ex

ternal)

OFF

INT.

(internal)

in

this

package

Remove

spare

chapter

that

the

tubes. Save all packaging

are

for

contains Radio Set

radio set, technical

possible use when equipment is to

. 35).

equipment

and

forward

or

Improp

not

for

possible damage.

received in proper con-

DD

Form

er

Shipment, according

the

form

6,

Uses

Cont?'"ols.

.

The switch is

handset is used

talkie.
earphone
hanclie-talkie

When

handie-talkie
be used
signa
phone
handie-talkie
the

talk swit

be pushed in.

When

radio set

The switch

handie-talkie is used

hand
handset

When

handi
be used
si
phone

(fig.

9).

Function or u

set

In

the

and

the

switch is

as a receiver;

ls

can

be

of

the

EXT.

position,

ch of

the

switch is set to

is

turn

is set to

set.

In

the

cannot

the

switch is set to INT.,

e-ta

lkie is

as

gna

ls

can

be h

of the handie-talkie. To

se

to

EXT.

with

EXT.

microphone of

cannot

set

is

turned

heard

handset . To use

as a transmitter,

the

ed

off.

INT.

INT.

be used.

turned

a receive

eard

the

position,

be use

to EXT.,

on

in

the

handset

without the

position,

on and can

r;

in

authorized

Report

when

the

han

die-

the
the

d.

the

and

can
received
the ear-

the

in

push-to-

must

OFF,

the

when

the

the

the

received

the

ear-

FOR

USE

repairmen

VOLUME

PUSH-TO-TALK

Push-to-talk

AIR

Fr

Loop

Handset

only.

Control

control

button

(handie-

talki

e)

switch

(handset)

VALVE

equency
desig·nation
str

ip

antenna

connector

(fig. 15)

conne

ctor

Function

use the handie-talkie

mitter, in

PUSH-TO-TALK

hancl

ie-talkie

The

VOLUME
loudness
heard
ea

rphon

the

The

PUSH-TO-TALK
handie-talkie is used only
the
the
position, to

on the

PUSH-TO-TALK
handie-talkie

The pu s

set is used only
OFF-INT. switch
talkie is
the EXT.
set
push-to-talk switch
mu

The

opening
talkie
pr

ess

the

internal air

handie-talkie from
erly

The

the
the

When

8),
is connected to
conne

When

set
the
handie-talkie.

of

in the e

e of the

handset

EXT.-OFF-INT.

INT.

ai1·

h-to-talk

in

position, to

on the

st

be pressed.

AIR

VALVE
in

to

prevent

ures from

case

durin

.

operating frequency

radio

set
frequency
the

loop

the

loop

ctor

the

hand

plug

(fig. 16) is connected

handset

or

use

the

INT.

button

must

be pushed in.

control

the sound

arphone

handie-talkie

, whichever is us

button

position.

put

as a

must

the

ai1·

as a transmitter,

the

pressures

is

antenna

antenna

on

the

set is used,

In the

the

handie-talkie

transmitter,

button

be pressed.

switch

when

of

EXT.

put

of

provid

case

of

high

building

g operation.

operating

tuned

designation s

is used

plug

the

loop

handie-talki

connector on

as a trans-

position,

of

adjusts

or

voice

(eith

er the

ed).
of

the

when

switch

of

is
INT.

the

of

the

the

hand-

the

EXT.-

the

handie-

position.

the

radio

the

the

hand

es

an

the

handie-

internal

up inside

High

prevent

is shown on

the

prop-

to which

trip.

(par.

(fig.

antenna

e.

the

hand-

the

the
the

the

or

in

In

set

air

air

8)

to

AGO 1426A

11

RADIO

.

RECEIVER-TRANSMITTER

(HANDlE-TALKIE)

12

HANDSET

CONNECTOR

FREQUENCY

DESIGNATION
STRIP

Figur e

9.

Radio

Set

AIR

VALVE

AN

/PRC-6, ope?·ating

cont?·o·ls.

TM

296-106

AGO 142GA

SPARE

CR

YSTAL

COUNTER 5

COUNTER I

AGO 142GA

COUNTER 3

COUN

Figu1·e

TER 4'

10

. Radio Set

C

OUNTE

AN

R 7

/PR C-

6,

tuning c

ont1

·ols.

TM

296-

OZ

13

b.

Tuning Controls (fig.

Control

Fi1ament

Seven cou

with

Frequency

Jumper

dials

bration

(fig. 12)

plug

switch

nt

ers

cali-

chart

7-1

10).

Function or u

Thi

s switch is us ed when the

set is being

th

e sw

th

e receiver
is decreased to
of

the
used
scale.

Th

e seven counters
when the radio
When
turn

the
an
tuning,
dials
cated on
ch

art

frequency des

The

chart,

(fig.
seven counters
channels.

Jump

er

tuned

(par. 12).

itch

is pulled up (opened),

gain

or

prevent

meter

during tuning from

the count

ed,

the

counter dial is changed.

approximate adjustme

the

are

the freq

(fig. 12)

mounted on inside of case

3), lists

plug

(ID-292/PRC-6)

set

is being

er

adju

number

numb

ers

set to

the

uency calib

for

ired

.

the

settings

for

7-1 is plugged between

se

radio

When

amplification

the

pointer

going

off

are adju

or r eading on

on the counter
numb

the

each of

tun

st sha

ft

nt

ers

indi-

ration

operating

of
the

sted

ed.

For

the

Control

Pu

sh-

to-talk

microswitch

is

or

12. Tuning Radio Set
Alinement Indicator ID-

(figs. 11, 12,

Note.

The radio

repairman.

ized

A crystal

43

controlli
set.

ng

For

operation on

of different frequencies

Wh

set

(Crystal

the

operating

Function

holes 7
Wh
jum
the
dicator ID-292/PRC-6
in

the
located on
cha
PUSH-TO-TALK
PUSH-TO-TALK
be used because
outer

the

and 1 of

en

the

per plug 7-1

plug

of

to

the

test

en the

radio

push-to-ta

ssis, is

case which is

radio

AN/PRC

or u

the

radio

set

is

is

Channel Alignment

socket.

set is

lk

the

recei

ver-trans

pressed

set

rather

button

it

is

mounted

is being

removed

- 6 Using Channel
292/PRC-6

and

13)

must

be

tuned

only

Unit

CR-23/

U)

frequency of

43

channels,

are

required

se

test

soc

being

tuned,

removed

is inse

rted

being

tuned,

microswitch,

mitter

than

button.

cannot

on

whe

tuned.

by

an

author

is used

the

radio

43

crystals

. Only one

ket.

and

In-

the

The

the

n

-

fo:r

14

Figu1·e

11.

Channel

Alin

ement Indicatm· ID

Receive?·-Transmitt~?;?·

-292/PRC-6

RT-196(* )/PRC-6.

connected

to

Radio

TM29Fi-

AGO

5

1426A

i;!o:

z

...

z~

~::::>

uz

47.0
47

.2 42.9

47

.4

47

.6

47

.8

48

.0

48

.2 43.9

48

.4 44.1

48

.6

48

.8

49.0
49

.2 44.9

49

.4 45.1

49

.6

49

.8

50

.0 45.7

50

.2 45.9

50

.4

50

.6 46.3

50

.8

51.0

51.2

51.4

51.6

51.8 47.5
52

.0

52

.2

52

.4

52

.6

52

.8

53

.0

53.2
53

.4

53.6
53

.8 49.5

54

.0

54

.2

54

.4 50.1

5·4

.6

54

.8 50.5

55.0 50.7
55

.2

55.4

Figu?·e 12.

crystal

can be used
When shipped
PRC-6
quency
othBr
be replaced

CK-6

be placed in

is

of

than

/ U

tuned

51

51

with

(par.

the

--'

<(

t-O

Vl

>-o:

0:"-

u

42

43

43.3
43
43

44.3

44

44

45

45.5

46.1

46.5
46

46.9
47

47

4 7.7

47.9

46.1

48

48.5
48

46

49.1
49

49.7

49.9

50.3

50.9

51.1

COUNTER NUMBER

•

I

...

.7

.1

.5
.7

.5

.7

.3

.7

.1

.3

.3

.7
.9

.3

2 3 4

1ST

XTL

osc

RF

77

77 77 78
75 76 76
74 75
73

74

72

72

71 71 71

70

70

69

68
67

67
66 66 66
65

65

64

64

63

63
62

62

61 6 1

59

60

59

59
58

58

57

57
56

56
55

55

54

54 54
53

53

52

52

51

51

49

50
48 49 48 48
47

48

46 46

45 45
43

44

42

43

42

4 1
40

41

38

40

37

39

36

38

34

36

'

33

35

32

33

30

32

29

30

26

29

2ND

RF

74

73

72

70
69 69

67

65

64
63

62

61
60
59
58
57
56
55

52

51
50
49

46
45
44
43

42

41
39
36

37

36

34

33

3 1

30

29

26

PWR
AMP

77
75
74 74
73
72
70

68
67
66
64
63
62

6 1
60
59
58 58

57
56
55
54
53'
52
50
49

47
46
45
44 44
43
42

41
40
38

37

36

35

33

32

30

29

TM4069-28

F?·eq~Lency

from

(alined)

me.

me is used,

calibmtion

in

the

radio set

the

factory, Radio Set AN I

for

an

If

an

operating frequency

the

51-mc crystal

a crystal from Crystal

7b).

The

51-rue crystal shou ld

spare

crystal holder located on

7

6

5

XTR

74

73

71
70
69
68
67
66
65
64
63
62

6 1
60
59
58
57
56
55

54
53

51.5

4 7.5

45

45

43

4.2
41
40
39

37
36
3,5
34

ANT
LOG

77

76
75

.74

73
72

70
69
68
67
66
64
63

62

61
60
59
58
57
56
55
54
52

51
50

49

.5

48

.5

47

46
45

.5

44

43

42
41

40
39

38
37

36
35

34
33
32

XTR

osc DBL

78 76
77 75
75

73
72
70
69

68

67
66
65
64

63

61

60

59

57
56

55

54
53

52 52.,5
50
49 50.5
48 49
47 46

46

45 46.5

43
42 44

41

40
39
38

37
35 36

34

33
32

31

clw?·t.

at

a time.

operating fre-

must

Kit

the receiver-transmitter chassis (fig.

the

operating frequency of

changed,

the

radio

set

must

operating frequency. To

the

be tuned to

tune

the

proceed as follows:

a.

Prepare Radio

(1) Open

side) of
and

open (pull

the

Set

jo1·

Alinement.

four

latches (two on each

the

case of the handie-talkie

apart)

the

case.

(2) Install

(3) Remove

the

battery

the

receiver-transmitter chas-

(par.

sis shield (fig. 3) by pulling

ward.

( 4) Remove

test

the

jumper

plug

socket (fig. 10)

and
alignment indicator plug into the
soc

ket

(fig. 11) .

(5)

Plug

the

crystal to be used into

crystal socket. (See operating crystal

10

in figure

Note.

changed, remove the

erat

ing

op
cry

stal to
frequency.
mark

ed on

c

rystal frequency

the crystal

(6) Set each counter dial

.)

When the op

crystal

frequency

be used

The operating

the

(fig.

side

6).

and

for

of

is

erating frequency

used

replace

the

the crys

marked

to
indicated in the frequency calibration
chart

(fig.

12). The number on
counter dial (fig. 10) is changed when
the counter

adjust

shaft

is

a screw driver.

Example:

quency

of

the

If

the

radio

operating

set

is 53.6,

counter dials as follows :

Co

unter

Dial

1

2'

3

4

5

6
7

b.

Turn

on Radio

Set

.

Turn

the

INT. switch to INT.

c.

Check Condition

(1) Set

the

alinement indicator to

of

Battr;ry.

selector switch (fig. 13) 0f

FIL.

10).

When

radio

set

the

new

radio set,

two-piece

16).

it

7-1

from

insert

test

for

the

it

with

new

operating

frequency

tal,

and

on

the

top

the

number

turned;

use

fre-

set

the

number

40
41
39
41
41
43
41

EXT.-OFF-

the

Press

.the

is

up-

the
the

the

is

old

the

is

the

of

the

AGO .1426A

15

CALIBRATION
LINE

Figu1·e

18.

Channel

Alin

SCREW DRIVER
CONTROL

eme

nt

Indicato?

· ID-29

SELECTOR
SWITCH

2/

PRC-6, [1·

ont pane-

TM

l.

5059-4

push-to-talk microswitch (fig. 10) on
the

receiver-transmitter chassis and
observe
dicator.
to
scale, replace

(2)

Set

ment

the

meter

If

the

the

left, of

the

the

selector switch of

indicator to

meter
the

to-talk microswitch and observe
meter
the

of
the

the
ment

14, step 6)
it

d.

Calibrate Alinement Indicator.

battery

has

switch (fig.

Set

the

selector switch of

tor

to

CAL.

screw

(fig.

driver

13),
switch, until
bration

of

the

radio set by pushing

of

the

alinement indicator.

meter

the

pointer is

red

part

of the B scale, replace

battery.

Not

e.

When

the

battery

cannot

the

of

(accurately)

alinement

test

must

be checked

indicator. The hissing noise

is

a good

be used to determine

battery

the

unless

to

its

indicator

condition

operating

of

been checked, open

10) of

Turn

the

radio set by pulling

(with a screw driver) the

control of the alinement indicator

located

at

the

the

meter pointer is

(CAL.) line. Close

of

the

alinement in-

pointer is on, or

red

part

battery

B+.

radio

can

(par.

Press

on,

or

to

set

is being
with

operational

the

the

radio

frequency. The

always be used to

the

battery.

the

the

alinement indica-

center of

the

it

the

at

the

filament switch

down.

of

16).

the

the

the

the

test

test,
condition

set

is

After

filament

selector

red cali-

(It

the

A

aline­push-

the

If

left,

tum~d,

aline-

(par.

but

tuned

the

it

up.

is not

necessary to calibrate

the

meter

before check-

ing the battery.)

e.

Adjust

adjusting
through
set

to

calibration chart,

Seven Counte1·

the

seven counters

k below. When

s.

The procedure

the

counter dials

the numbers indicated on

the

radio

set

is

are

the

approximate
tuned to its operating frequency .
necessary to

adjust

each counter individually,
using the alignment indicator, to
mum (best) results. When
ers,

do

not

turn

the

more

than

a small distance to

or

to

the

wise)

should
just

more

If,

after

not

be necessary to

than

the

left

one-half

radio set

ber on a counter dial is

number indicated

(for
quency calibration chart,
for calibration by a field

adjusting

counter

adjust

the

(counterclockwise) .

turn

the

turn

in

either

has

been tuned,

not

within 8 of

that

counter) on

turn

in

maintenance

man.

Example: The

radio set is 53.6 me.

the number on

not

should

be more
number indicated on
chart

is

40

for

operating

After

the

counter dial

than

the

counter 1

frequency

tuning

48

or

less

frequency

at

an

quency of 53.6 me.

f.

Counter 1

switch of

the

Adjustment

alinement

.

Set

indicator

given

in

frequency

It

is only

obtain

the

count-

(fig.

right

(clock-

counter

direction.

the

num-

the

the

radio

repair-

of

the

radio

for

counter

than

32.

calibration

operating

the

selector

to

IN

J. Turn

for

are

ly

opti-

10)

It

ad-

the

fre-

set

the

set

The

fre-

f

'

1

16

AGO

1426A

'

counter 1

adjust

slowly to

a peak (maximum)

the

meter
oounter 1
quarter

proximately 80

g.

pointer

adjust

turn

(the

Co~mte?"

3,

to

percent

2,

selector switch of

Turn

to

LIM.

ju

st

for counters

a maximum

h.

Counte?" 5 Adjustment

ment

switch of

(1)

the

3,

meter

the

Set

the

selector switch of

ment

indicator to LIM.
to-talk microswitch on
transmitter
counter 5
meter

meter
the
adjust

meter
this

reading

Caution:

pointer

right.

beyond

first goes off

adjustment,
sho uld be
ing

or

off

(2) Set

ment

the

selector switch of

indicator

pointer will be

bration
not
turn

at

lin

the

the
or left, until
red

c-alibration line. Counter 5 is now
adjusted.
follows:

(a)

Turn

counter 5 adjust

right;

the

right

reading

is obtained. With

at a maximum

the

left

approximately one-

meter

and 4

right

radio

reading

of

maximum).

Adjustments.

the

alinement indicator to

or left,

2,

and

reading

the

4,

in

that

is obtained.

. Pull up

set.

Press

chassis and slowly

adjust

until a maximum

is obtained.

In

some equipments

will go off

Do

not

turn

the

the

point

the

the

meter pointer

at a maximum

the

scale to

at

e.

If

reel

calibration line, slowly

counter 5

the

Check

the

to

DISC. The meter

or

near

the

meter

adjust

meter

pointer is

the

adjustment

slightly

the

meter

pointer should

or l

eft

until

reading,

turn

should be ap-

Set

the

counter ad­order, until

the

fila-

the

align-

the

push-

the

receiver-

turn

the

the

scale to

counter 5

where

scal

e.

the

After

(peak) read-

right.

the

aline-

the

reel

cali-

pointer is

to the

right

at

the

as

to

the

move to

the

tion line.

Turn

(b)

counter 5

left; the

to

the

left.

the

to

calibration line

meter

Return

justment.

i. Counter 6

switch to

the

Adjustment.

P.A.G. position.

to-talk microswitch and

until a maximum

f.

Final

Counte?" 4 Adjustm

tor

switch
microswitch and
minimum

k.

switch to
the

antenna

reading

Counte?"

P.A

meter

to

P.A.P.

turn

counter 4

is obtained.

7 Ad.fustment.

.P. Connect

connector (fig.
to-talk microswitch and
until a maximum

(Do

this

step in a clear

from

the

antenna.)

Note.

Repeat

l. R

eturn

Radio Set to
tion.

(1) Remove

from
plug 7-1, into

Push

(2)
( 3) Replace

the

case.

Check

( 4)

with

meter

the

steps

the

the test

down

the

the

another

area

in j

alinement indicator plug

socket, and

the

the

chassis shield

tuning

set
quency. Sidetone should be clear
undistorted

if

properly alined.

Turn

the

(5)

EXT.-OFF-INT.

OFF.

right

of

the

red

adjust

slightly to

pointer shou

the

meter
after

Set

the

Press

turn

counter 6

reading

Press

is reached.

ent.

Set

the

push-to-talk

adjust

Set

the

the

whip

antenna

15).

Press

turn

counter 7

reading

is obtained.

and keep body

and

k above.

Its Opem

ting

insert

test

socket.

filament switch.

and

by communicating

tuned to

the

the

radio set

switch

calibra-

ld

move

pointer

this

selector

the

push-

adjust

the

selec-

until

selector

the

push-

adjust

away

Condi-

jumper

close

same

has

the

ad-

a

to

fre-

and

been

to

AGO 1426A

17

Secti

on

I.

CHAPTER

OPERATION

PROCEDURE

3

OF

OPERATION

13. Installation
Returned t

(fig. 14)

Before

the

radio set can be operated,

ible steel whip

the

whip

antenna
handie-talkie. To
is held to
move

being used,
the
tenna

its

stored position.

a,. Insta,

the

case by a nylon cord.

the

nylon cord. When

it

is wrapped around

handie-talkie. Do

when

it

is removed from or

lling Whip Antenna, from Sto1·ed Posi-

tion.

(1) Remove

antenna

(2) Place

ten

(3) Hold

the

na (B, fig. 14) and pull

the

antenna

the
antenna
the

antenna

that

the

( 4) Screw the base of

into

the

fig. 14) .

b.

Returning Antenna,

(1) Unscrew

from
Push

(2)

latches

(3) Place the

antenna

14.

To

Receive and

(fig. 15)

Operation

To receive

of

Whip

o)

Stored Position

Antenna from (and

the

antenna must be connected

connector on

prevent

not

the

its loss,

the

kink

or

case of

the

antenna

Do

antenna

the

twist

not re-

is not

case of

the

returned

the

tip

of the

holding clip (A,

finger u

through

antenna

(C,

near

fig.

14) and pull

through

antenna

whip

the

the

the

4,

tip

whip
tip of

3,

is free of

antenna

to

Stored Position.

base of

antenna

the

and

2.

of

the antenna under

holding cli

To

Send

1. Screw

antenna

1

the

connec

antenna

nder

latch 2.

latches 3 and 4

the

the

antenna

p.

(Handie-Talkie)

Procedur

antenna

tor

from

fig.

14).

the

whip an-

the

tip

the

base of the

the

tip

the

case.

whip

antenna

connector (D,

whip antenna

connector.

through

e

into

the

.

flex-

to

the

an-

the

whip

to

of

of
so

the

To se

Operation

nd

Proccdu1·c

2.

Turn

the

AIR

tum

to

the left

.

3.

Turn

on

the

handi

ing

the

EXT.-OFF-INT.

INT.

4. Wait a
get

5.

Place

ear.

6.
trol

ssing

hi

grou
phone.

?'eceive condition.

Note.

batt
(voice) is
weaker
the
noi

7. Listen
else is on

8.
ton

ing

hissing
when
pre
for

the
to
a
pre

few

warm.

the

Adjust

or

turn

to

the

right

noise (called

nd

noise) is h
The

radio

Th

e hissing noi

ery

is in good condition.

receiv

or disa

PUSH-TO-TALK

se

or

a.

If

not
check to see
plug

socket (fig.

b.

If

not
battery

tery
16a) and ins

c.

If

Pre

and

ssed,

Note.

PUSH-TO-TALK

speak. The

ir

ssed

ppear entirely.

voice w ill not

the

hissing noise

be heard

fits

the

hi ssing noise

be

heard

from

(par.

16b) .

the hissing· noise

not

be h

battery,

new
set

for

to
the

ss

the

wait

noise

must

noise does

the

PUSH-TO-TALK

turn

repair.

There

until

the

and the hiss

seconds to l

earp

ed,

snug

plug, remove

eard

repair.

make sure

air.
PUSH-TO-TALK

a few seconds. The hiss-

is a

transmitter will

PUSH-TO-TALK

VALVE

e-ta

lkie

switch to

et

hone

against

the

VOLUME

(clockwise)

tube

eard

in

set

is now

se

indicates that

lhe hiss

18).

the

in

tendency

When

ing

noise

button

tall

ing

Do

or

be hea

rd.

or

in

the

that

the

ly

in

the

or

after checking

radio

a n

ew

or

after

ins

turn

in

that

disamJ

ea?'.

not

the handie-talki

to

forget

butt

on be

noi

se dis

one-half

by

turn-

the

tubes

the

con-

until

a

or

back-

the

ear-

in

the

the

a si

gnal

will

get

not

pt·ess

the hissing

voice

can-

earp

hone,
battery
battery

voice

can-

the

the

bat-

set

(par.

battery

voice

can-

talling

the

radio

no one

but-

If

the

disappear

button

to

press

fore starting

not

be

on

button

appears.

a

is

e

the

is

18

AGO 142GA

Operation

To

turn

off

radio

set

15.

To

Receive

(fig. 16)

Not

e. The

handie-talkie
erated

without
the earpho
not
switch
the

is

in

To receive

ne a

be used. To use

of

the

handset

good workin

Op

erat

ion

Pt

·oce

dure

9.

When

the

hiss

ing

noise

disappears,

talk

into

the microphone.
clearly
the
When talking,
his

and

in a

normal

lips close

to

the

the

operator

own voice (called sidetone) in
earphone. Sidetone will
when

the
air.
(h

andie-ta

10.
rel

ease

and

If

sidetone is

After

the

wait

transmitter

lkie)

calling

PUSH-TO-TALK

for

a voice s

not

for

the dis

is

heard,

repair.

ignal
other station. No received
be

heard

when

the

PUSH-TO-TALK

button

is pressed.

Not

e. Do

nec

essary

transmitting

the transmission time to a minimum, the

operator
battery

11. Turn
to

OFF

12.

Turn

right

Note. Do

s

witch

the

equi
power
EXT. or

and

hand

set

permits

not trans

. More battery

than when receiving .

will

greatly

.

the

.

the

until

it

not leave

in the

pment

is used

INT

. pos

To

Send

the

mit

any

power

prolong the

EXT.-OFF-INT. switch

AIR

VALVE

is finge

rtight.

INT.

up

the

ot·

EXT.

is

actually

when the switch is

ition.

in us

(Handset)

operator

EXT.-OFF-INT

Speak

tone

with

microphone.

will

hear

not

be

heard

not

on the

turn

tant

station,

button

from

signal

will

longer

than

is used

when

By

keeping

life

of

to

position

unle

e.

Buttery

in

to

carry

on his back. The handie-talkie can be op-

the

hand

set

nd

microphone

handi

e-talkie

is used,

g·

order.

1.

hand
handie-talkie
The
connector
plug
down on
to

2.
antenna

3.
to

. When

the

hand set,

must

mak

e sure

Plug

the

set

connector (fig. 9) on

plug

in

the

the plug

the

right.

Screw

connector.

Turn

the

the

left

the

hand

set

of

the

handi

e-talkie

the

EXT.-OFF-INT.

be

set

to

EXT.

that

the

handie-ta

Proc

dur

e

hand

set

plug

into

. Do

not

force

the

will fit correctly into

in

only one way. Lock

the

connector

anten

AIR

and

turning

na into

VALVE

by

the

pressing

.

is

used,

can

Before

lkie

plug.

sli

ght

whi p

lh

turn

the

in

the

the

the

ss

the

the

the
the

the
the

ly

.

-

Ope

ration

To send

turn

To

16

off

l'adio

set

. Removal

270/U

(figs. 17 and 18)

a. Removal.

( 1) Remove

position.

Open

(2)

side) of

Open

( 3)

( 4) Pull

and

the

and

open (pull

case.

the

In

the

arm

locks

out

battery

Procedure

4.

Turn

on

the

radio

the EXT.-OFF-INT.

5.

Wait a few

tubes get

6.

Adju

st

trol

to

the right

is

heard

set.

The radio

or

in

seconds to

warm.

turn the

until

the earphone of

set

is now

ceive condition.

7.

Listen

in

earphone

make

sure

that

no

one else is on the

air.

8.

Pre

ss

the

push-to-talk switch

the

handset.

hissing

9.

When

talk

into the microphone

set.

Speak

tone

with

Wait a few

noise will di s

the

hissing

clearly

the

lips

close to the

noise

and

phone.

10.

After

re

lease

the

hands

signal

radio

set

heard

when

of

the

handset

Not

e.

handie-talk

to op

erate

If

this condition

11.

Turn

calling

the

from

. No received

If

the

ie is defective,

the

EXT.-OFF-INT.

the

push-to-talk

et

and

wait

the

other

the

push-to-talk switch

is

pressed.

earphone

handie-talkie with the

exists,

or

notify

OFF.

12.

Turn

AIR

VALVE

until

it

is fingertight.

Installation of Battery

the

antenna

four

the

case of

reta

ining

closed position,

the

battery

the

battery

socket (B,

from

latches (two on each

the

handie-talkie;

apart)

the

arm

the

plug in place.

plug from

fig.

18).

set

by

turning

swi tch

to

EXT.

let

the

VOLUME

con-

a hi ssing noise

the

head-

in

the

?'e-

of

hand

set

second

s; the

appear.

disappear

of

the

hand

in a normal

micr

distant

station,

switch

for

the

voice

station

signal

will be

microphone of

it

may

the repairman.

be

possible

handset.

the

switch to

to

the

right

BA-

the

stored

two-piece

(A, fig. 17) .

retaining

the

to

of

s,

o-

of

or

AGO 1426A

19

B

TIP

OF

ANTENNA

(

L

TCH

I

20

WHIP

ANTENNA

CONNECTOR

Figu1·e 14.

Rad

D

io Set

AN I PRC-6,

installation

of

antenna.

·---~-----™ 296-15~

AGO

1426A

. .

RADIO

RECEIVER-:

(HANDlE-

TRANSMITTER

TALKIE)

:...---

WHIP

ANTENNA

CONNECTOR

OO

P

L

·ANTENN A .
CONNECTO

EARPHONE

R

AIR
VALVE '

~---EXT.

SWITCH

-OFF·

I NT.

HANDSET

CONNECTOR

TM

296-108

.__

__

_

AGO 1426A

F'

igtwe 15. Radio S et

AN /PRC-6, con

t1·ols

and conne

cto1·s

.

21

HANDSET

Fig~we

16. Handset H-33

(*)/PT.

TM

296-110

( 5) Pull up on

fig. 18) until

b. Installation.

Caution:

that

EXT

.-OFF-INT. switch is in the

tion.

(1) Unpack

tainer.
swelling.
shows leakage or swelling.

(2) Line up

battery

( 3) Place

against

( 4)

Push

disc (B,

battery

(5)

Fit

battery
battery
socket.

( 6) Hold

hand, and slowly close,
hand ( C,
that

plug does

the

rear

of the

it

comes out of the case.

battery ( C,

Before installing battery, be sure

OFF

posi-

the

new

battery

Inspect

Do

the

plug (A,

the

socket end of the

the

the

battery

fig.

it

not use a

battery

fig.

retainer

18) until the r·

drops into

the

battery

plug carefully into

socket. Make sure

plug fits snugly in the

the

battery

fig.

18),

it

locks

the

battery

Caution:

Make

not

turn

from the con-

for

leakage and

battery

that

socket with the

18).
battery

disc (B,

against

the

case.

the

ear

fig.

18).

retainer

of

the

the

that

the

battery

plug with the left

with

the

right

the

retaining

arm

plug in place.

sure

that

the

battery

when

the

retaining

arm

is closed since

tery

plug will break.

(7) Replace the cover

17.

Use

of Adjustable Strap

The adjustable

strap

the handie-talkie consists of

straps:

19).

The

the

inner

inner

strap

and

hold the handie-talkie in his

ing (fig. 22). The outer
operator as a shoulder sling to

on

talkie
straps

a.

Making

his back (fig.

function independently

(1)

Shoulder

Place
the

the

operator

Sling

the

case of

PUSH-TO-TALK

on top (A, fig.

(2) Remove the loop end of

from

the

outer movable buckle (B, fig.

19) .
Place

the

so

(3)

the

the

and

left of

outer

D,

fig.

loop end of

strap

now be used as a shoulder s

and

attached

the

outer

is used

strap

1).

The

(Using Oute1·

the

and

the

19).

strap

guide

as

19).

The

the

pins of

close

the

to
two

the

latches.

the

separ

straps

by

the

operator

hand

while operat-

is used by

carry

the

inner

and

of

each other.

handie-talkie

button

adjustable strap

the

outer

the

outer

1,

and pull up

far

as

it

will go (C

outer

strap

ling

bat-

case of

ate

(A, fig.

to

the

handie-

outer

Stmp).

with

facing

strap

strap

can

.

to

22

AGO 1426A

( 4)

b.

Retuming

(1) Place

(2) Pull

(3) Move

( 4)

If a larger
desired, move

the

to

justing
gether
outer

strap

the

the

PUSH-TO-TALK
the operator
on top (A, fig.

the

through
loop end of

of

strap
outer
strap

strap
guide 1 in B, figure 20.)
the

right

on

the

buckle

20) , until
the

to
Pull

right

the

through

shoulder sling or loop is

the

left

on

the

the

buckle and

(E,

fig.

(F,

Outer

Stmp

case of

and

20).

loop end of

strap

the

guide 1

outer

guide 1. (The loop end of

is shown to

outer

movable buckle to

the

outer

and

strap

the

outer

of

the

loop end of

strap

guide 1 (C, fig.

outer movable buckle

outer

strap

by ad-

the

strap

19).

Pull up on

fig. 19).

to

Stored Position.

the

handie-talkie

button

the

adjustable

the

outer

and

strap

place

to

the

with

facing

strap

strap

the

left

the

the

left

the

strap

by

adjusting

together

(B, fig.

movable buckle is

strap

holder.

the

outer

strap

20).

to-

the

of

(5) Place the loop end of

in

the

outer movable buckle (D, fig.

19).

Note. Remove

adjusting

(6) The

the

outer

adjustab

le

stored position.

c.

Adjustm

(1) Place

ent

of

Inn

the

case of

the

PUSH-TO-TALK

the

operator

e1·

and

on top.

(2) Remove

from

the

loop end of

the

outer movable buckle (A, fig.

21).

(3)

Pull away

the

(B, fig. 21).

( 4) Move

( 5) Place

left to

the

right

fig.

21).

in

the

the

inner

tighten

the

to loosen

the

loop end

outer movable buckle (D, fig.

21).

the

outer

the

slack,

if

necessary,

movable buckle.

strap

is now in

Stmp.

the

handie-talkie

button

the

adjustable

the

outer

outer

strap from

movable buckle to

inner
the

of

strap,

inner

the

and

strap

outer

strap

by

the

with

facing

strap

strap

case

the

to

(C,

strap

AGO 1426A

23

BATTERY

24

Figwre 17. Rernoval

of

Batt

e1·y BA-270/ U.

TM

Z96-150

AGO 142GA

BATTERY

RETAINER DISC

PLUG

CHASSIS

SHIELD

RETAINING ARM

t

I

A

BATTERY
PLUG

B

RETAINER

DISC

AGO

H26A

Figw·

e

18

. Installation

of

BMte1·y

BA-

270/U.

25

c

B

LOOP

END· OF

OUTER STRAP

26

Figu1·e 19. Making a shoulde1·

stmp.

OUTER
MOVABLE

BUCKLE

AGO 1426A

A

OUTER MOVABLE

BUCKLE

LOOP
OUTER

END

STRAP

- OUTER
MOVABLE

BUCKLE

OF

Figt~1·

e

2

0. Retunting

B

D-

ottt e

?· stHt1J

GUIDE 1

LOOP END
OUTER STRAP

to sto1·ed position.

OF

T~

296-

15

~

AGO 1426A

27

STRAP

28

Figu1·e

21

.

Adj~tstment

of

(

inne1·

st1

J M ~ 96-155

·ap.

AGO 1426A

F

ig~t7'e

22. Use

of

inne1·

by h

st?'a7J

an

d.

to

stt1JPO?'t

TM

?'adio

296

-II

set

AGO

1426A

29

18.

a.

place

Siting

and

Camouflage

For

the best reception

or

locate

the

Section

radio sets

II.

and

transmission,

so

that

FIELD

there

are
no obstacles (such as hills and buildings) in the
paths

over which communication is desired.

possible, locate

or

stay

other

away

23)

to
hospitals,

b.

In

addition to locating

the

high place.

from ste

or

power units.

equipment on a hilltop (fig.

It

is also import

ant

el bridges, power line

the

equipment

where good communication is possible, conceal-

ment

from

the

enemy is important. Any camou-

materials

flage
moist

19.

materials

Operation

Climates

Rad

io

Set
tic, tropical, and
certain
not

precautions must be taken which

normally necessa

a. A1·ctic Climates. Subzero

will affect
dry

batteries,

in

the

form of
solidify)
Battery

Radio

This

(also

in

BA-2270/ U, is made

Set

battery

in
performance
are

no differences

batterie

two
and

removed exactly like Ba

(par.

16).

b. T1·opica

problem in tropical climates. Keep
ment

dry.

not

using

or

paper.

that

are

used

must

be dry since

will ground out the antenna.

in

Arctic,

AN /PRC-6

desert

Tropical,

and

can be operated in arc-

climates. However,

ry

in milder climates.

temperatures

the

efficiency of

BA-270/U

past

subzero weather.

AN /PRC-6

the

battery

contains

. Like all

an

electrolyte

e which will freeze (or

An

arctic ba

for

use

in subzero temperatures.

contains a different electrolyte

paste

form)

in subzero

in

s.

Battery

which will give

temperature

s.

appearance between the

BA-2270/ U is installed

tter

y BA-270/ U

l Climates. Moistur e is a spe cial

the

Do

not

leave

it

on

the

ground. When

the

radio set,

wrap

it

in dry cloth

Desert

are

ttery

with

better

Ther

equip-

OPERATION

lem in de
than

PROCEDURES

c.

Desert Climates. Sand is

sert

regions, causing more difficulty

dust and di

rt.

When changing

the

be careful when opening the case of
set

so

that

If

opening
dry
in the edges of

s,

no sand

the

case, wipe

cloth. Open

the

the

enters

the

case,

rubber

the

inside. Before

radio

set

and

remove all sand

gasket

that
two-piece case. Before closing the case, shake
the

radio

set

carefully to remove

sa

nd

that

might

have fall
radio set is not being used,
in clean dry cloth

20.

Antijamming

When

it

or

paper

Procedure

is first noticed

en

it

.

that

any

inside. When

should be wrapped

the
being jammed by radio interference,
ator

should notify his immediate superior

cer.

Do

not stop operating

reduce

the
is received
ence, use

the

effects of

with

jamming

the least amount

following procedure, in

the

radio set. To

so

that

given:

a. Slowly

that

the

tical to a horizontal position. Listen

,

position
done. Keep

turn

the

radio set in

antenna

of

position changes from a ver-

best reception while
the rad

io

set in

the

this

position

reception.

b.

If

the

e

place the radio

around to

c.

If

signal still cannot be understood,

s·

et

the

possibl

close to

point of best reception.

e,

change

the

body

the

location until best

reception is obtained.

d.

If

the

jamming

that

communication is imposs ible,
immediate superi or officer. Keep
above procedure until

interference is so

repeating

an

int

elligib

received.

special prob-

the

battery,

the

rad

io

with

a clean

seals

the

grains

of

the

radio

set

is

the

oper-

offi-

the signa

of

int

erfer-

the

order

the

hand

so

for

the

is being

of

best

and

turn

stro

ng

notify your

the

le

signa

l is

l

30

AGO 1426A

I

SITING

.

AGO

1426A

Figu1·e

23.

Siting Radio

Set

AN!PRC-6

COUNTRY

.

31

CHAPTER

4

PREVENTIVE

Section

21.

General

a.

Preventive maintenance is work per­formed on the radio set to keep
ing order. Preventive maintenance differs from

trouble shooting or

prevent
co1

condition,

troubles from occurring

··rect troubles

b.

To keep

the

it

should be checked
tervals, depending on how often the radio set
is used. When in field us
necessary to in
neglected or abused and

Note .

The

ope

16).

If

parts

rator

are

suspected

I.

that

PREVENTIVE

repair

since its object is to

exi

st

in

it

the

MAINTENANCE

in good work-

rather

than

radio set.

radio set in good operating

at

regular

e,

day-by-day care is

sure

that

the

radio set is not

that

it

is kept cleaned.

Section

should

of

not

being

II.

OPERATOR'S

attempt

to

defective,

make

notify

to

in-

any

an

MAINTENANCE

FOR

RADIO

22.

Echelons

For

Radio Set AN /

tenance is done by both first

maintenance men.

is performed by

ec

second

helon maintenance is
organizational
ator

must

not
maintenance because more
result.

Seconcl echelon

1Jerfonnecl only by

PREVENTIVE

repairs

autho1·izecl

MAINTENANCE

or

rep

lace

repairman.

SET

of

Preventive

the

repairman

attempt

any

parts other

AN/PRC-6

Maintenance

PRC-6,

and

First

echelon maintenance

operator

(par

to

perform

harm

maintenanc

an

c~'uthorizecl

than

preventive main-

second echelon

(par

. 23) ; and

performed

by

the

. 26) . The oper-

second echelon

than

good can

re

pai?"man.

the

battery

e 1nust

be

(par.

23. Operator's Maintenance

It

is the

operator's

a.

The radio set has a battery, whip antenna,

and

a handset.

b.

Dirt

and moisture

case, antenna,

handset

responsibility to see

Checklist

are

removed from the

connector, and

connector.

Not

e. Since

the

operator must keep the

c.

with

The

be done

VOLUME control,
of

the

radio receiver-transmitter and the push-

to-talk switch of the

cl.

The

of

the

radio

e. The

6).

step

f.

The

dirt

may

a cl

ean

dry

EXT.-OFF

four

latches on

set

open

battery

handset

is in good condition (par. 14,

cord and

cause

failure of the

radio

set clean.

cloth.

-INT. switch, AIR VALVE,

and

PUSH-TO-TALK button

handset

and

close easily.

operate freely.

the

sides of

antenna

signs of kinks.

g.

The

adjustab

le

strap

is not

torn

antenna

radio

Thi

the

do

not

show

or frayed.

that:

set,

s can

case

h.

The radio set is

quency by communicating

tuned

with

the same operating frequency.

24.

Operator's

The operator

a.

Drop or handle set roughly.

b.

Tinker with the inside of set.

c.

Attempt

cl.

Attempt

Precautions

must

not:

to replace tubes.

to replace

any

battery.

e. Remove the operating or

f.

Write

on the card

ing (fig. 3) ;

25.

Use

of

Preventive

a.

DA

Form

used by

the

maintenance.

mo

st

to

radio equipments.

this

11-238 (fig. 24) is a check

operator in

It

is a general form which

on

the

is used by

Maintenance

performing

Instructions

to

the

a radio

part

other

spare

inside of

the

repairman.

assigned fre-

set

of

than

the

crysta

l.

the

hous-

Form

list

preventive

app

lies

for

the

32

AGO 1426A

~~-,

EQU

L

EGE

'

NO

. I

c.:

2

IJ

~

1(2,

IU-

NO.

1(.2;

8

IPM

ENT

N.OM

ND

FOR MARKING

COMPLETENESS

microphone

LOCATI

ON

C

LEAN

DIRT

CARRYING

IN

SPECT SEATING

VI,

BRATORS

I

NSPECT

CON

AC

T lO

ll.

CHECK FOR

CLEAN

AND

t.!

OUN

TS, SH

LINE

S,

WAVE GUI

INSPECT

CASES

METAL SURFA

OPERATOR

ENC LATU

FIRST

RE

CONDITIONS:

AND GENERAL

s ,

tu

~cs,

AND INSTALLATION SUIT

AND

MOI

BAGS, CO

, PLUG-IN COILS AND

TROLS

NORMAL

T I

GHTEN

OCK

1-!

0UtJTS, ANTENNA MOUtiTS, COAXIAL

DES, AND CABLE

,

~

CES, FOR

s

pare parts, tec

STURE

MPONENT

OF

READ

FOR

BI NDitW,

OPERATION

EXTERIOR

OUN

TINGS,

RUS't

COND

ITI

FROM ANTENNA

PANELS.

ILV

ACCESSIBLE

RESISTORS

.

I

TEM

OF COMPONENTS AND

MJTENNAS,

,

CORROSION, AtiO

ECHELON

RADIO

COHHUN

Sat is! ac t ory;

"'

ON

OF

EQUIPMEN

hni

ABLE

FOR

,

MI

" PLUCK-OUT"
.

SCRAP

IIlG,

CONNECTIONS

TOWERS,

MA

-l

NTENANC

I CAT I ON,

INSTRUCT

X

NOTE:

St

rike

IT

EM

T (rec

manual s a

OPERATION

CASES,

TRANSMISS

AND

EX POSEr

STURE

.

eive
nd

ITEMS: T

LOOSENESS, WORtl

RACK

PAR. 23d

cLJ/

NORMAL

CROPHONE, HEADSETS,

EXCESSIVE

.

MOI

E

CHECK

Dl

RECTI

IONS:

Adjustment,

o

ut

i t

DAILY

r , t rltnsmitte

BCCI!!ll

sori

,

CHESTSETS,

UBES

WEEKLY

~~

e~

ION

ON

Fl

Se e

other :sicle

EQUIPMENT SER

repair

erns

ne t

r, carryin

es)

.

, LAMPS,

OR CHI

110

r!J..

IN

TROLVTE

14

CL

.WitlDO

LIST

MDI

applicable.

KEYS, JACKS, PLUGS

CRYS

PPED

SPECT STORAGE

EAN

SIGNAL

FOR

NG,

CARRIER,

IAL NO,

or rep lacement

A

CBBCS

,

TALS,

FUSES

,

GEARS, MI

SALIGNMEtiT

B~TTERIES

L

EVEL AND

AIR FILTERS, BRASS tiAME

WS,

JEWEL ASSEMIHIES

CORPS

RADAR

wire

a

nd

TELEPHONES

,

CONNECTORS,

SPECIF I C

req

uiredj

cab

PAR.

PAR

POS

,

PAR.

PAR. 23h

I

TEl~

FOR DIRT

GRAV

.

EQUIPMENT

®

l e ,

23

0

,

.

23b

ITI

VE

2 3C

LOOSE

,

AND DAM

ITY,

PLATES

, DI

Detect

corrected

COND

TER

AGED

"

~IH

T

MLS

CASES

IT I

,

s

PAR.

t..ND

M

ETER

AL

ON

w T F

ELEC

-

.

23

::;;:

e

.

s

'

~~

i0

IN

SPECT CORD, CABLE, WIR

BREAKS,

FRAY

itlG,

10

IN

SPECT ANTENNA FOR

DAMAGED INSULAT

ORS

@

INSPECT CAi

TEARS, AND

12

IN

KNOBS, JACKS, CONNECTORS, ELEC

S

ERA TORS, AND

19

IF

lVAS ITEMS

FRA

VI NG.

SPECT FOR LOOSENESS

TAT

S, R

ELAY

S, SELSVNS, MOT

PI

LOT

DEF

ICI

ENCIES

E,

DETERIORATION

NOTED

AND

ECC

EtlTRI CI

AND

REFLECTO

,

L

EATHER, AND

OF ACCESSIBLE ITEMS:

ORS, BLOWERS, CAPACITORS, GE

L1 G HT

ASSE

' .

ARE

NOT

SHOCK MOUNTS

, KI

NKS, AND STRA

TIE

S,

CORROSION, LOOSE FIT,

RS.

CABLING

TRICAL T

RANSFORMERS

MO

ll ES.

COR

RECTED

FOR

CUTS,

IN.

FOR

MILDEW,

SWITCHES

,

DURING INSPE

EPLACES

R

Fig

u1·e

PAR. 23

PAR.

,

PO

WER-

N-

CT ION

OA

24 .

15

f

16

17

23g

18

NDICA

TE

I

,

FORM U 91··1 DEC

DA Form

IN

SPECT ME

TERS

I

NSPECT SHELTERS AND

PROOF lUG.

CHECK

ANTEtiNA

CHECK

TER.INAL

GASKETS

, 0 IRT

ACT

ION TA

KEN FOR

.~0,

V/HICH

11-

238.

FOR DAM

GUY WIRES

BOX

COVERS

AND

GREASE.

CORRECTION

I S OBSOLETE.

AGED GLASS

FOR

COVERS

FOR

FOR

.

AND

AOEQUAG-V-OF

LOOSENESS

CRACKS

,

CASES

.

WEATHER

AND PROPER

LEAKS,

-

TEllS ION

DAMAGED

TM296-160

.

AGO 1426A

33

use of
the

form.

b.

The items of

Set

AN/

the

PRC-6

form

appear

the

are

on

the

reverse side of

form

that

apply to Radio

shown circled in figure 24.

Paragraph

to

the

the

information which applies to Radio Set

AN

/ PRC-6.

refer

ences in

paragraphs in

the

thi

s manual

ITEM column are

that

contain

Not

e 1.

The

case

of the handie-talkie.

pairman.

re

Note

2. Org

repa

irm

an.

Section

organizational

The

anizational

Ill. ORGANIZATIONAL

maint

enance

receiver-transmitt

level preve

man

ntive maint

PREVENTIVE

must

not

remove the rece

er chassis must be r emoved only by

enance (second echelon) must be pe

MAINTENANCE

iver-transmitt

er chassis (fig. 3)

an

authori

zed field mainte nance

rform

ed only by an

from the

authorized

T\JBE GUARD
FOR

TUBES
THRU V7
(SHOWN

26. Organizational Maintenance Procedure

a.

Perform

nance

move

(par.

b.

Open

the

c.

Check to see

chassis is free

d.

Check

on tubes.

the

23).

the

case of

chassis shield by pulling

from

for

broken tubes or cracked glass

If

it

is necessary to replace tubes,

follow instructions given in

34

VI

ON

TUBES)

Fig~t?·e

25. Th

operator's preventive mainte-

the

handie-talkie and re-

it

upward.

that

the

receiver-transmitter

dirt

and

moisture.

paragraph 30.

e gua?·d

1·e1noved

.

e. Check to see

their

sockets. The firmness of tubes is deter-

mined by pressing down

f.

Check to see

are

on

the

tubes.

g.

Check to see

its

snugly in

socket.

h. Check to see

rly

prope

plugged into the

i. Check to see

10) is pushed down as

TUBE GUARD
FOR

TUBES VB,

VIO, V

II,

V12,V9

(SHOWN REMOVED)

that the tubes fit snugly in

the

tubes in

that the tube

that

the operating crystal fits

that

the

jumper

test

that

the

filament switch (fig.

far

as

the

guard

s (fig. 25)

plug

socket (fig.

it

will go.

sockets.

7-1

10).

AGO 1426A

is

SECOMD

AND THIRD

EQUIPMENT

NOMENCLATURE

LBGBHD

POR

HARliNG

CONDITIONS:

HO

...,

COIIPLETEN(S$

h.obo1, opere,.,,,, tedwllcol ••mJ•l•

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CLEAN
CtiEST5£fS ,
Ca.IPONENT

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AND

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S.

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SEATING

OF

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CRYSTALS, FUSES, CONNCCTORS, VIIIRATORS,

UG-

IN COl LS

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IS

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CONUOLS

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WAVE

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CANVAS

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RUST,

CA!ILE,

WIRE,

OET£RIOAATION,

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IT£16, UATII[R1 A/10

FRAYING,

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DAMAGED

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WIIIDOW

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SPECT

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RADIO

COHHUMICATION

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ITEH

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CONDITION

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ACCESSIBLE

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A~D

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Of

MA I NTE"ANCE

NSTJW

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N()TB:

Strilr:e

(ucelve

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PAR.

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ROPHON(,

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CARRTUiG

8AGS

PAR. 23

OuT•

ITCM

PAR.

PAR.

PAR.

CASES, RACK

IAL

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PAR. 23d

EXPOSED

STURE.

FOR

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STRA

IN.

PAR. 23f

I"OR

MILDEW,

PAR

SWITCHES, KNOfiS

I"OWERST

ATS,

GENERATORS

TERMINALS,

DAMAGED

CASES.

PAR. 23e

AND METER

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,

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LEAK$,

,.

GASKETS, DIRT

IF

DEFICIENCIES

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GREASE

NOTED

ARE

.

NOT

CORRECTED

OURIN(i

DAMAGED

PAR.

INSPECTION

26

, I ND

C

CHECK

FINDING,

See

oth~

I

EQUIPMENT

stmu

t,

items

aot

NO.

~

19

[L[CTROH

~

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CLEMf DU

0

TYPE TUBES.

"

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FOR

26

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RELAY
READILYACCESS

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29

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SETTINGS

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®

SOCKET

SPRING

PARTS,

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KS1 BULGfS, AND

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DIRT, MOISTUR

INSULATORS, FOR

AND MOIS

TURE.

CAPACITORS

AUD

TS.

CA81NETS

CONNECTIONS,·CRA

.

WITH

APPLICABlE

ORDER

.

Of

CONWUTATOR,

MOUNTINGS

FOR

TS,

BATTERIES.

SCREEN

SPO

CELL&

.

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NT

PAR'26. d,e,f,g

TENSIOH

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TENSION; BIHO-

E,

MISALIGII-

CRACKS

,

RESISTORS

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CK$

PAR.

26

BRUSH

WeAR

TRANSFORMERS

P

AR

26m

TS.

!

~·

;

-

n

,

REPLACES

D.\

••

FORM

~9, 1 9~C

,o,

WHICH

IS

OBSOLETE

DA

1NA:-o~

11-239

~

TM296-161

Figu1

·e

2

6.

DA

Fo?'"tn

11-289.

A

GO

1426A

35

..

j.

Compare

to

the

number
bration
counter
indicated in

(fig.

12).

the

indicated in

chart

(fig.

dial should be

the

Refer

to

12e.

k. Place

the

chassis shield in place over

receiver-transmitter

l. Remove

the

battery
compartment
screws (fig.

the

battery

card

on

by loosening

28).

m. Check to see

minal

strip

are

tight.

n. Check

leading to
or

the

Not

e.

use a

hot

to

the

handset

If

it

is

sol

dering

see

that

terminal

connector (fig. 28) .

necessary

iron. Do

number

3).

on each counter dial

the

frequency cali-

The

number

within 8 of

the

on each

frequency calibration

the

example in

paragraph

chassis.

the

that

there

(par. 16),

bottom of

the

the

screws on

are

and

the

two

battery

the

no broken wires

strip, volume control,

to

solder

any

broken

not

drop

sold er

in

the

number

chart

the

remove
battery

card

ter-

wires,

radio

set. Make a good soldered
soldered connection is

of

trouble.

o.

that
and

that

any

breaks

p. Close

27.

Preventive

DA

Install
the

battery

the

the

Form

the

battery

battery

or

kinks.

case of

Maintenance

11-239 (fig. 26) is provided
maintenance check list
repairman.
to

most radio equipments. Ins

use of

the

It

is a general

form

are

joint

very

difficult t o

(par.

plug fits snugly in

plug and cable

the

handi

for

on

the

form. Circled items in figure

to

Radio

Set AN/

in

the

ITEM

this

manual

applies to Radio

column

that

Set

PRC-6.

are

contain

AN/

Paragraph

to

the

PRC-6.

or conn

ect

ion. A

locate

16).

Check

the

do

e-talkie.

Form

the

organizational

form

which

tructions

reverse side

26

are

applicable

references

the

paragraphs

information

poorly

as a

source

to

socket

not

applies
for

of

which

see

have

as

a

the
the

in

3

~

AGO 142BA

CHAPTER

5

TROUBLESHOOTING

Not

e.

Instructions in

28. General

Troubleshooting

be

performed
Troubleshooting
placing tubes

many

ever,
at

this

level.

these

faults

29. Equipment
Level

a.

Tool Equipment TE-41. This equipment

contains
izational
iron, solder,

b.

Multimeter

maintenance
meter,

although
mining
by

an

organizational

paired

by

structions

c.

Electron Test Tube

tional
this

maintenance

tube
pecially
tubes

should be discarded. Instructions

are

packed

30.

Tube

a.

Changing Tubes. Tube failures

sponsible
that

occur
whether
operational

and

fau

Preventive

to a minimum.

the

tools

maintenance:

and

can be performed without

whether

a field

for

tester,

in

determining

with

Replacement

for a large

in

the

tube

troubleshooting

(1) To change a tube, remove

guard

the

of
catch;

of

end

this

chapter

at

organizational level mu

by

an

authorized repairman.

at

this

making

are

for

level is limited to re-

minor repairs. How-

lts can be located and

maintenance will keep

Available

that

are

at

Organizational

neces sa

ry

a screwdriver, soldering

diagonal

TS-

its

use will save time

the

maintenance

use

are

cutting

297 /

U.

radio

set

repairman

packed

pliers.

Organizational

can be repaired

or

repairman. In-

with

TV-7 /U.

can

be performed

although its use is helpful, es-

the

tube

whether

tester.

or

not replaced

percentage of the faults

the

radio set. To determine

should be replaced, follow

test

(par.

(fig.

25).

tube

then

the

Press

guard

press

guard

down one end

until

it

is

down on

and

pull away from

authoriz

co1

·rected

for

organ-

in

deter-

must

be re-

the

meter.

Organiza-

without

for

are

34a).

the

free

of

the

AT

ed

st

this

use

re-

the

tube

the

other

ORGANIZATIONAL

repairmen

only.

the chassis. When
in position, place red dot (fig. 27) on
the tube, next to
receiver-transmitter chassis.

down on the tube to make
the tube fits snugly in its socket.
replacing the tube (or
the tube guard.

(2) When replacing a tube, determine

whether or not to keep the old tube

the spares will become full

whose condition is uncertain.

remove more
radio set

pected of being defective, remove
and replace
be good.
condition of the radio
tube was replaced with

the

of

replaced.
set did
replaced, the tube
was probably good. A tube
be used to determine the quality
the tube ( b below) .

(3) There may be variations

of leads of

are

issued

are

issued with

cause confusion. The correct lead

length should be

(fig. 27).
length using diagonal
Do

not pull on the leads while
them. Use sandpaper to remove
or

roughness on ends of leads

cutting the leads.

b.

Tube Checking. A tube

to determine

LEVEL

putting

the

than

one tube

at

a time.

it

with a tube known to

Compare

radio set

If

the

not

change

the

after

condition

after

that

spare

with

tubes. Some tubes

long leads, and others

short

approximately%

Cut the leads to

tester

if

a tube is good. However,

a new tube

red dot on the

tubes),

If

a tube is sus-

operation

set

before

the

the

of

the

was removed

tester

in

leads. This

the

cutting

may

Press

sure

that

After

replace

of

tubes

Do

not

from

the

the
operation
tube

was
the radio
tube

was

may

the

length

can

inch

required

pliers.

cutting

burrs

after

be used

the

or

it

or

of

AGO 1426A

TM29.6-116

results obtained

always conclusive;

tube

a

is tested in a tube checker

with

a tube checker

the

conditions under which

same as those under which
in

the

set.

For

this

reason,

38

are

the

tube operates

the

best

Figu1·e 2

are

not

test

7.

Tube location.

not

the

to

determine
with a tube known to be good.
it

is quicker and more reliable to replace a

in the

rather

rad

than

the

qua

io set

to use

lit

y of a tube is to replace

In

many cases,

with

one known to be good

the

tube checker

it

tube

AGO 1426A

31.

Organizational Troubleshooting Procedure

The organizational

should be followed in the

inspection, resistance check

and

operational

a. Visual Inspection (p

portant
Many

visual in

a
by
check

33).
repairman
be
or
sary.

performed
is
man,

part

of

faults

of

spection.

visual inspection,

at

battery

b.

Resistance Check

This check

decide

turned

whether

in to a field maintenance

further

Organizational troubleshooting can be

without

not

turned

perform

in

the

tro

ubleshooting procedure

troubl

the

the

radio

order

eshooting

ar

. 32

tro

ubleshooting procedure.

set can be located by

If

the

trouble is not located

perform

given: visual

at

the bat

test

).

This is an im-

the

plug.

at

Battery

may

help

the

organizational

whether

the

rad

io set should

troubleshooting is neces-

this

to a

operat

check.

fie

ld maintenance repair-

If

the radio

ional troubleshooting

.

Plug

repairman

test.

c. Operational Test

the

corrective measures to take for a given con­dition
test
corrected,
tenance

32.

holes 7

of

the

radio set. Follow the operational

in

the

order

turn

in

repairman.

Visual Inspection

Check to see

a.

The

and

b.

The

that:

jumper

1 of

filament switch is pushed down (fig.

(par.

34) . This

given.

the

If

radio

the

trouble is

set

to a field main-

pl ug 7-1 is inserted between

the

test

socket (fig. 10).

10).

c.

The

number

of

the

8

number
calibration
amp

le in

paragraph

d.

All tubes

e.

Any

wires

volume control,

on each counter dial is within

chart

indicated on

(fig.

12).

the

Refer to the ex-

12e.

are

firmly seated in

to

the

terminal

and

handset

their

strip

connector

frequency

broken. ·

Caution

make sure

lder

so

f. All

28)

g.

into

are

The

:

If

that

the

the

tight.

battery

it

is

necessary

the

soldering

radio

set.

screws on

plug fits snugly in

to solder
iron

the

terminal

any

is hot.

Do

strip

the

socket.

tery

plug,

resistance

(par.

set

test

gives

not

sockets.

(fig. 28),

are

not

connection,

not

drop

(fig.

battery

33.

Resistance

Check

at

Battery

Plug

(fig.29)

Use Multimeter TS-297

resistance between each pin of

the

and

(fig. 29).

mu

ltimete1'.

receive

r-t

rans

Use

only high resistance scale

Turn

the

/ U to measure

the

battery

mitt

er

chassis ground

EXT.-OFF-INT. sw itch

to INT.

nd.

d.

Normal

I

0 ohm.

Above

1 to 5

ohms.

0 ohm.

If

reading
check
terminal

tight,

terminal
reading

after
turn

If

reading

ohms,
pair

reading

If

ohms,
pair.

If

reading

turn

to see

and

is

checking

in

radio

turn

.

turn

in

radio

Corr

ect

is more

that

strip

no

wires

str

ip

not

less

set

is less

in

radio

g

reat

is

in

radio

is more

set

Test

ion

than

screws

(fig. 28)

leading

are

broken.

than

battery

for

than

set

-er
set

than

for

repair

than

repair.

Measure reading
between on meter

Pin 1 and

chassis
ground.

Pin

5 and

chassis

grou

Pin 4 and

chassis 100,000
gro

und. ohms.

Pin

6 and
chassis
groun

Pin

7 and
chassis
gro

und.

Pin

2 and
chassis
ground.

Pin 3 and

chassis
ground.

34. Operational Troubleshooting

The operational troubleshooting procedure

must

be followed in

a.

Receive1· Trouble. Install a whip

(par

. 13) . Open

EXT.-OFF-INT. switch to INT.

UME control a

the

the

AIR

ll

the way to

order

given:

VALVE,

Turn

the

and

the

right.

antenna

turn

Listen

in earphone of handie-talkie:

(1)

If

background (hissing) noise is

heard,

perform

the

following, in the
order given until a hissing noise is
heard:

(a) Check to see

fits snugly in

that

the

the

battery

battery

socket (fig.

16).

the

plug

of

1 ohm,

on

ar-e

to

If

1 ohm,

strip,

.

100,000

for re-

for

re-

1 ohm,

the

VOL-

not

plug

5

AGO

1426A

39

BATTER'!'
CARD

40

Fig

tt?

·e 28. Tenninal

st1

·ip location.

TM296·14

AGO

'2

1426A

Fi

gu1

•e

29.· ·Methocl

of taking batt

e1·y

JJlug nu;asU?·eme

nts.

TM

296·141

AGO 1426

.1>,

41

(b)

Replace

(c) Replace tubes

V3, V2,
not remove more
a time.
not

heard,
repair
nance

repairman.

( 2)

If

background noise is weak :

(a)

Check

to

is pushed down

(b)

Replace

(c) Tune

the

frequency of

(d)

Replace
V3, V2, V1, V9,
crystal, in
a time, until a loud hissing noise is
heard.
weak,

turn

pairs.

If

(3)

normal background noise is heard,
communicate
is known

tuned

is

the

battery

.

V8, V7, V6, V5, V4,

and

V1, in

If

background noise is still
turn

to

authorized field mainte-

see

that

the

battery.

radio

the

tubes

the

If

background noise is still

in

with

to

be in good condition and

to

the

that

order. Do

than

one tube

in

the

radio

the

filament switch

as

far

as

it

will go.

set

to

the

operating

crystal

(par.

V8, V7, V6, V5, V4,

and

the

operating

order

the

given, one

radio set

a radio set which

same frequency.

set

for

at

for

12).

at

re-

If

voice signals cannot be received,

in

the

radio

set

for

repair.

b.

Transmitter Trouble. When

is

heard

TALK

in

the

button

earphone, press

and

talk

into

the

microphone
your lips close to the microphon
cate

with

a radio

good condition

and

set

is

that

tuned

is known

to

quency.

If

the

( 1)

appear
button is pressed;
heard
into
nals cannot be

(a) Check to see

background noise does

when

in

the

the

microphone; or

the

PUSH-TO-TALK

or

earphone

sent

:

that

the

if

7-1 is connected between holes 7

1 of

the

test

socket (fig.

(b) Replace tubes V10,

V13, in

that

order, until

Vll,

corrected.

(c)

Tune

the

radio

set

(par.

(d)

If

the

radio

set

still

cannot

for

signals,

repair.

to send voice

radio set

hissing

the

PUSH-

e.

Communi-

to

the same

not

sidetone is

when

speaking

if

voice sig-

jumper

10).
V12,

trouble

12).
be used

turn

in

turn

noise

TO-

with

be

in

fre-

dis-

not

plug

and

and

is

the

42

AGO

1426A

CHAPTER

6

LIMITED

35.

Limited

If

the

radio

of

time, pe

a.

(par.

b.

c.

from
tal

(51 me) shipped

the

radio
me
Crystal

d.

stored

e.

(par.

f.

6)

in

until

rform

Perform

26).

Remove the

Remove

the

radio s

set to an opera

(par.

12).

Kit

Place

position

Place

an

17b).

Wrap

dry

the

cloth so

used again.

Storage

set

is to be stored

the

STORAGE

following:

AND

for

any period

a preventive maintenance check

battery

the

et

operating

and

(par.

replace

16).

crys

it

tal

with

(fig. 10)

the crys-

with the radio set. Tune

ting

frequency of

Return

CK-6/ U

the

whip

the

(par.

antenna

removed crystal to

7b).

in

carrying

(par.13).

adjustable

components of

that

strap

in stored position

the

radio set (par.

they

will be kept clean

DEMOLITION

36. Demolition to Prevent Enemy

a.

the radio set is necessary to

from using

olish the equipment only by
manding officer.

b.

51

or

TO

PREVENT

ENEMY

USE

Use

AuthMity for Demolition. Demolition

prevent

or

salvaging

the

equipment. Dem-

order

Methods

(1)

of Destru

ction.

Smash. Smash crystals, tubes, receiv-

er-transmitter

chassis,

of

and

the

enemy

the

handset
by using a heavy object such as
butt

of a rifle,

(2) Burn.

Burn
smashed, including
uals.

Use gasoline

or

a heavy

everything

the

or

rock

that

cannot be

technical man-

kerosene,

available.

(3)

Shoot.

If

necessary, the equipment can
be disabled by carefully directed small­arms

fire.

Bury

or

( 4) Disposal.

parts

in slit trenches, fox holes,

scatter

the

destroyed

nearby streams.

of

com-

the

if

or

AGO

1426A

43

[AG

413.44 ( 1

BY

ORDER

Jul

55)]

OF

THE

SECRETARY OF

THE

ARMY:

OFFICIAL:

JOHN

A.

KLEIN,

Major General, United States

The

DISTRIBUTION:

Active

Army:

CNGB
Tee
Tee

Hq,

CO

NARC
Army
OS
OS

Log
MDW
Armies

Corps

Div
Tng
Ft

& Cp

USMA
Gen &

SigC

Gen

Atlanta
SigC
SigC

POE

OS

SigC
SigC

Mil

Mil
Units

Adjutant

(1)

Svc,

Svc

CONARC

AA
Maj
Base

Comd

(1)

(5)

(2)

(2)

Div

Br

Sch

Depots

Sec, Gen
Depots

(2

')

Sup

Agencies
Fld
Lab

Dist
Msn

organized

5-15R
5-16R
5-17R
5-35R

,

5-37R

5-137R
5-215R
5-218R

5-225R
5-226R
5-227R
5-329R
6-lOOR
6-101R

6-115R
6-116R

DA

Bd

(1)

Bd

Comd

Comd

Comd

(5)

(2)

(2)

(5)

Svc

(25)

(2)

Gen

Maint

(5)
(1)
(5)

(2)
(2)

(2)
(2)

(2)

(2)

(2)

(2)

(2)

(2)
(2)
(2)

(2)

(2)

(2)

(2)

Genera

(1)

(5)

(Incl

(5)

(5)

Sch

except

Depot

Depot

(20)

Shops

under

ea Test

(2)

(

5)

(2)

l.

except

(None)

(10)

(

3)

following

Army,

Sec)

(1)

TOE:

MAXWELL

General, United States

Chief

6-117R
6-125R
6-126R
6-127R
6-135R
6-136R
6-200R
6-201R
6-225R
6-226R
6-227R
6-235R
6-236R
6-300R

6-301R

6-315R
6-316R
6-317R
6-325R
6-326R

6-415R

6-416R
6-435R
6-515R
6-535R

6-537R

6-538R
6-545R
6-546R
6-558R
6-575R
6-576R
6-577R

6-615R
6-616R
7-2R

7-llR

7-15R

7-17R
7-25R
7-26R
7-27R
7-31R
7-35R

(2)
(2)
(2)

(2)

(2)
(2)
(2)
(2)
(2)
(2)
(2)
(2)
(2)
(2)
(2)

(2)

(2)

(2)

(2)

(2)

(2)
(2)

(2)

(2)
(2)

(2)

(2)
(2)

(2)
(2)

(2)

(2)
(2)
(2)
(2)

(2)

(2)

(2)
(2)
(2)
(2)

(2)

(2)

(2)

D.

TAYLOR,

of

Staff.

Army,

44

AGO

1426A

NG:

USAR:

For

explanation

7-37R
7-95R
9-49R

9-500R

10-407R
11-7R
11-16R
11-57R
11-127R
11-128R
11-500R
11-557R

State

None.

AG

(2)

(2)

(2)

(AA

thru

(2)

(2)

(2)
(2)

(2)
(2)
(AA

thru

(2)

(6);

Units-same

of

abbreviations

AC)

AE)

(2)

(2)

as

Active

used, see

Army

SR

320-50-1.

11-587R (2)
11-592R (2)
11-597R (2)
17-2R

(2)

17-25R

17-26R (2)

17-35R
17-36R

17-51R

17-55R
19-27R

19-97R

except allowance is one copy

(2)

(2)

(2)

(2)

(2)

(2)

(2)

to

each

unit.

AGO 14

26A

U .

S.

GOVERNMENT

PRINTING

OF"FICE: 1935-360503

45