Military Surplus rigs AN-PRC-1 Service guide

_..

,

---

--·

ERRATA

TM

11-638

WAR

DEPARTMENT

RADIO

CAUTION:

BEFORE TRANSMITTER TAIN

Page J,

"Headset" should read "Heads "Key" should read "Key J "Technical Manual"

11-638". The following components should be listed:

1 Cord 1 Mounting (for k 1 Cord CD-6

Crystal Case holders

1 Wrench for

l Wrench for 10

Page

5, Pa

"76"

Page

6, Par.

"(5)

Page

6, Par.

., ( 6)

Page

6, Par. 13 c1.; Pc1r. 13

"Cord CD-201 in.".

Pa.ge

:10, Par.

"PLT. .VOL."

Page

12, Par.

This entire paragraph should read "CASE

l 0

co

ntains 47 Crystal Holders FT- 243."

Page

12, Pa

"gr

ound wire and selected

REMOVING

RT

/PRC

THAT THE RECEIVER DIAL READS BELOW

Par.

2.

CD-201- A 18 in. (For Key J-

ey J-37

05

(For

CY-86/T

FT

-243

and crystals.

8-32

-32

r.

·s

r

l.

should be "104".

11

a.

Allen Wrenches, (2) ."

1 L

b.

Spare fu

ses

."

- A" should 'reaJ "Co rd CD-201

23 a.;

should read "PLT. VOLTS".

32

b.

·

r.

33 h. Omit:

OR INSERTING RECEIVER

-1

INTO SUITCASE

et

HS-30".

-3

7".

should read "Technical Manual

37).

).

Headset HS-

RC- 10, including

Allen Head Set

Allen Head Set Screw.

Add:

b.

Par.

23 c.

crys

tal".

30).

Scr

ew.

CY-

SET

BE

CER-

TM

47

crystal

- A 18

86/TRC-

TECHNICAL MANUAL

AN/PRC-1 (

5-3

6.c.

Page 1

During this operation, at certa

nd

5 megac

a

2.

Select the dip at the highest frequency indication. i

nc

orrect dip is used,

will be noticed

Page 16- 40.g.

During this op eration, at and 5 megacycl dip at

th

eli

p

is

used, the high pitched whistle will not

al

the frequency

paragraph

Page 17-4l .f.

During this operation, at and 5 megacycl

ticed.

Select the peaks at the highest frequency indica -

tion.

If

current drain will be noti

41

h.

Page 1

7,

''T

o insure the operator that the transmitter

to

power

against the metal portion of the antenna binding post.

The

neon bulb will glow. The intensity of glow will

increase with incre

Pag

e 20, Par.

"powered iron" should be

Page 20, Pa

"Immediately adjoining Condenser C 4 minal block. There attached nearest the front panel, the receiver with a low impedance headset. the position nearest the condensor C 4

(8).

in

frequencies, between 4

ycles

in the low band, 2 dips

no

minimum plate current drain

as call

ed

for in paragraph 36 C

ce

rtain frequenci

es,

2 dips m

e highest frequency indication.

of

the inserted

40 i.

es

in the low band, 2 peaks

the incorrect peak

Par. 41

i.

Add:

the antenna, hold the base

as

ed power output."

ce

ced

ay

rta

is

as call

in

be notice

cry

stal

frequenci

used,

no

ed for in paragraph

46.

"p

owder~d

r.

48.

Add:

is

a wir

e,

white with blue tracer

to

this block.

When

this wire

is

When

may

If

as called for in

minimum plate

of the neon bulb

iron".

1,

is

connected for use

1,

be

noticed.

If

the

(11).

es, between 4

d.

Select the

th

e incorrect

be

heard

es, between 4

may

be no-

is

delivering

is

a black ter-

in the position

this wire

the receiver is

is

s,

in

.f

' •' a •

connecte metal tag attached should indicate the headset used. The word appears on one side of the tag and the word "LOW" the reverse s

Page

"T minal blo Par.

Page

"400-ohm series resistor" should ca

Page

"Fo r this adjListm S

P

"0.05 seri sistor."

P

The sequen d

"10 ma." should be "21 ma.", "7 ma" should be "15 ma

Page

''Load resistor" should be "Shunt resistor..,

P

"F

d for u

se

with

;L

high impedance headset. The

to

the phone jack on the front panel

id

e.

25, Par. 57

he term 'output impedance

48, immediately above.

25,

Par.

pacitor".

25, Pctr.

WIT

CH in the

age

26, Par.

age

30, Pa

(5), d (1), d (3), d (2) and d (1)

".

31, Pa

age31,Par.62c

our screws" should be "six screws".

a.

Add:

swi

tch' refers

ck

described in this 'Erra ta' under Page 20,

57

b.

be

57 c. Add:

ent set the

CW

position."

57

d.

es

capacitor" should

r.

61

d.

ce

of operations should be:

r.

61

d (6).

(2)(c).

CAL

be "400 ohm sen

"H

to

"0.05 mfd. series

CW.

. Under d

Page 34.

Sec

attach

ed sheets.

Page 35.

C 18, C 13, C 31- Quantity per unit should be

IGH

on

the ter-

PHONE

es

re-

(5)

3.

•

Page

37.

Signal Corps Stock No. 2Z5842-23

"

should

be

"L-20460-B." Signal Corps Stock No. 2Z5842-18 should be

Page

R4 3Z5994A1 Resistor:

R6 3Z5999A1 Resistor: lixed; wire wound; 9.10 ohms

RS

Page

"R34; R35". Quantity per unit should Add

SW4 3Z9826-24.6 Switch: rotary; sing

SW1 3Z9826

SW5- Add: "Meter Switch"; "dwg. No. S1.701.02"

Page

"North American Philips Dwg. No. S1.231.06".

"Cord CD- 201-A: (for Key U

CD

Stock

"L-20460-B."

38.

Add the following items:

.fixed;

±3%

special; North American Philips

dwg. No.

+ 3% specia dwg. No.

3Z5988D4 Resistor: fixed; wire wound; .840 ohms

+2% dwg. No.

39.

Add

to

R29:

the following items:

-24

.7

shou

ld

41,

T5- Add:

-201-

'A

18 in.

No

. "3

El201A

No. "2B8300" shou

S1.264.04 1

Sl.264.05 1

special; North American Philips

S1.264.

be

position; calibrate, c.w. phone switch; North American Philips Dwg. No. Sl.701.02 1

Switch: rotary; 2-section; 2 poSitiOn North American Philips Dwg. No.

1.701.04 1

be Dwg. No. G8.710.14.

(for

Key

'' should

ld

KNOB-dwg.

wire wound; 4.17 ohms

l;

North American Philips

03

1

"3".

band-transmitter switch;

-37

)"

should

J-37)

".

be

"3E7207-2".

be

"2B830U".

le

section, 5

be

No.

"Cord

SECRET

( 2 )

· 3 H

.

·,

-S

-~~-~

~...,

--~-

WAR

DEPARTMENT

UN

Cf.AS.)·c,F

l':c

roc"d . ..

1\v

A,.t~

e,

...

•.. . .

.....

A . p

~.....

RADIO

AN

/PRC-1

TECHNICAL

Q .

Dele

.

?:].

..

CLv,

otAAA.

3.1..()

.-.

f-

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

~'S.~

..

....

~.I)

Y.U.

,

············

··

MANUAL

~

SET

( )

C (\' I

WAR

DEPARTMENT

•

13

OCTOBER

1944

-

..

AUaEUM

WAR

DEPAR

T

MENT

TECHNICAL

";)

MANUAL

TM

11-638

RAI)IO

AN

/PRC-1

~JJJEif

...

~.

·'

' 1

SET

( l

WAR

DEPARTMENT

•

u.

-

~

..

,..

f:~orcdco

By

')~qn

········---~~---··········

Auth

of

....

?~~..f.-

.........

~·-································--'---

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

SCEt Tcchnica Documents

13

...

.3.J..Q

lD

..

~.A.Rt:A.

OCTOBER

~

Dale

·.?:.~

...........

... : ..

f.:

.......

.Ld.

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

.....

Center

-

~:S

..

)1.{~~-

_.

_____

_

1944

•

.,

TM

11-638, Radio Set

[A.

G.

300.7 (21

BY

ORDER OF

June

44).]

THE

SECRETARY OF

AN/PRC-1

(),is

WAR:

WAR

DEPARTMENT,

WASHINGTON

published for the information and guidance of all concerned.

25, D.

G.

C.

C.,

13 October 1944.

MARSHALL,

Chief

of

Staff.

OFFICIAL:

J.

A.

ULIO,

MAjor

DISTRlBUTION:

X.

(For

explanation

General,

The

Adj11tanl

General.

of

symbols see

FM

21-6.)

•

ll

TABLE

OF CONTENTS

SECfiON

I.

Description.

General Radio Range

Frequency Power Power Power

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

Set

AN/PRC-1 ( ) , list of

components

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

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . • • 3

covc:rage

source

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

input . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

Weight . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

Adapters

Antenna

Carrying

Headset

Key

Receiver-Transmitter Rectifier

Controls

LINE

ON

REC. BAND

VOLUME 3 ........................................

CAL. METER

OSC.

LIGHTS

AMP. BAND ANT. SWITCH

ANT.

SEND Miscellaneous

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

case

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

HS-30 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

J-37

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

Power

RT-30( )jPRC-1

Unit PP-36(

)jPRC-1..............................

with

case.. . . . . . . . . . . . . . . . . . . . . 14

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

SWITCH A . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

OFF

B

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

TUNING 1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

SWITC

CW.

H 2 . . . . . . . . . . . • • . • . . • . . . . . . • . . . . • . . . . . . . . . . . . . . .

.

..........

PHONE 4 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

SWITCH 5 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . • . . . .

TUNING

7

6.

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

.........

..

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

TUNING 8 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

SWITCH 9 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

10

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

TUNING

REC

11

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

12

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

markings

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

· 2

11 12

15

18

20 21 22 23 24

25 26

28

29 30

31

1

1 1

1

2 2

4

5

5 5

6 6

6

8

9 9

9 9 9

9

10 10 10

11 11

11

II. Installation and

Initial Installation of

Operation.

procedure

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

receiver-transmitter

and

rectifier

power

unit

...•.••••••••

Installation of antenna . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Additional information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Preparation of set for Operation

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 7

use

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

• •

32

33

34 35

36

12 12

12

14

15

m

,

Use of the receiver . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Precautions in operation of receiver . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39 15

Receiver calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40

Use of the transmitter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41

Summary

III. Functioning of parts.

Receiver R-f amplifier stage Converter stage I-f amplifier stage Second detector stage A-f amplifier stage Beat-frequency oscillator

Transmitter

Power amplifier stage Power supply

Switches

IV. Maintenance.

of

instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42

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

..........

........

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

........

TAB:LE

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

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

........

.. : ..........

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

..

.........

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

.

.....

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

OF

.

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

..

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

.

..........

CONTENTS

.

..........

.....

. .......

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

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

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

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

.....

........

.......

.

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

....

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

.

......

.....

....

...........

Paragraph

. .

..

. .

..

. . . . . .

38

43

44

45

46

47

48 49 50 51 52 53

Page

15

16 16

17

19 19 20 20 20 20 21 21 21 21 22

General Operational inspection Replacement Receiver alignment Procedure in locating trouble

Voltage measurements . . . . . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Point-to-point resistance measurements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60

Servicing the transmitter . . .

Moistureproofing and fungiproofing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62

V. Supplementary data.

Maintenance parts list for Receiver-Transmitter Maintenance parts list for Maintenance parts

........

· · · · · · · · · · · · · · · · · · · · · · · · · · · ..

· · · · · · · · · · · · · · · · · · . . . . . . . . . . . . . . . . . . . . . . . 55

of

tubes, fuses,

....... · ...

Ji

st for Radio Set

and

indicator lamps. . . . . . . . . . . . . . . . . . . . . . 56

· · · · · · · . . . . . . . . . . . . . . . . . . . . . . . . .

.......

..

Rectiifier

· · . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

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

Power Unit

AN/PRC

·...................

RT-

30(

)/PRC-1......

PP-36(

- 1 ( ) miscellaneous. . . . . . . . 65

)/PRC-1.........

54

57

58

59

61

. . 63

64

23 23 23 25 27 30 30 30 31

33 38 39

TV

LIST

OF ILLUSTRATIONS

Pig.

No.

1 Radio Set

2 Line cord adapters

3 Adapters in left-hand compartment ......

4 Antenna 5 Right-hand accessory compartment 6 Headset 7 Key J

8 Rectifier

9 Front panels in open carrying

10 Radio Set AN/ PRC- 1 (

11

Receiving section

12

Transmitter section of front panel of

13

Block diagram of Radio Set AN/ PRC-1 ( ) 14 Block diagram 15

Bottom view of receiver-transmitter chassis, showing location of parts 16 Rear 17

End view of receiver-transmitter chassis, showing location of parts 18 Rear view 19 Bottom view of rectifier power unit showing location of parts

20

Schematic diagram of Radio Set

AN/PRC

on

HS-30

-37

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

Power Unit PP-36(

vi~w

of

- 1 (

),

components

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

reel

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

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

)/PRC-1

case

),

installed for operation

of

front panel of Receiver-Transmitter RT

of

Radio Set

receiver-transmitter chassis, showing location of parts

rectifier power unit showing location of parts

AN/PRC

ANjPRC-1

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

.

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

.... .

and Receiver-Transmitter RT-3

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

Rec

- 1 ( ) set-up for alignment of receiver

Title

.....

...

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

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

.

.........

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

eiver-Transmitter RT-3

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

( )

, . .

...........

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

........

-30

( )/ PRC- 1

0(

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

...

.

.........

· · · · · · · · · · · · · · · · · · · · · · 6

..

0(

)/PRC-1.

..

· · · · · · · · · · · · · · · · · · · · · · 9

· · · · · · · · .. · · · · · · · · · · · · · · ..

)/ PRC-1

..........

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

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

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

...

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

...

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

·.

· · · · · ·

. · · · · · · · · · · · · · · · 5

· · · · · · · · · · · · · · · · · · 5 . · · · · · · · · · · · · · · · 6

...........

· · · · · .. · · · · · · · · · · · · · ·

.......

...........

· · · · · · · . . . . 7

· · · · · · · · · · ·

· · · · · · · · · · · · · · · · 8

· · · · · · · · · · · · · · ..

· · · · · · · · · · ·

· · · · · ·. · · · · 24

· · · · · · · · · · · · · ·

· · · · · · · · · · ·

· · · · · · · · · · · · · ·

· · · · · · · · · · · · · · · · · 28

· · · · · · · · · · · · · · 29

........

· · · · · · 33

·..

Page

vu1

7

13 16 16 19

24 25 26

v

•

DESTRUCTION

WH

Y -

WHEN-

HOW - 1. Smash - Use sledges, axes, handaxes, pickaxes, hammers, crowbars, heavy tools.

WHAT

To

prevent the enemy from using or salvaging this equipment for his

Wh

en ordered

2. Cut - Use axes, handaxes, machetes.

3. Burn -

4. Explosives -

5.

Disposal - Bury in

USE

ANYTHING

-

1.

Smash - Receiver, transmitter, antenna, power transformers, crystals, tubes, head-

2.

Cut - Wiring and line cords.

3.

Burn - Capacitors, c:arrying

4. Bend - Panels, chassis, containers, etc.

by

your comJmander.

Use gasoline, kerosene, oil, flame throwers, incendiary grenades.

Use

.firea!lms,

Scatter.

IMMEJ)IATELY

set, meters,

carrying

cases

Of:

grenades,

slit

trenches, fox holes, other holes. Throw in streams.

THIS

tdegraph

:.

~

NOTICE

bene.fit.

1NT.

AVAILABLE

EQUIPMENT

key, resistors, capacitors, coils, switches, etc.

case,

canvas bags and equjpment receptacles m

.

FOR

DESTRUCTION

THIS

EQUIPMENT DEATH THE

SOURCE

OR

TRANSMITTER

5.

Bury and scatter - Any

SAFE~rY

USES

PAINFUL

.

INJURY.

UNIT

or

DESTROY

DANGEROUSLY

DO

NOT

WHEN

THE

all of the above pieces.

EVERYTHING

NOTICE

HIGH

VOLTAGES, AND

CHANGE

POWER

TUBES

PLUG

IS

CONNECTED

OR

CONTACT

MAKE

MAY C

ADJUSTMENTS

TO

THE

AUSE

POWER

ON

vn

V:lll

Radio

Sel

AN/PRC-1 (

compo1lents.

) ,

SECRET

SECTION

DESCRIPTION

•

1. GENERAL.

Radio Set AN/ PR radio receiver and transmitter system with all auxiliary equipment in one housing. ceiver

is

designed for the reception

modulated signals, as well

code signals. amplifier transmitter sion.

2.

RADIO

ENTS.

See figure 1 for illustration

Quan.

1

4

2

4

2

SET AN/ PRC-1 ( l,

Adapter

l adapter with continental type prongs.

1 adapter with English type prongs.

adapter,

attachment plug body. Antenna. Case. Headset.

Key.

Receiver-Transmitter eluding the following:

Fuses (one in accessory compartment). Lamps, neon, ccssory compartment). Lamps, pilot,

use, two running spares). Tubes use, one runni Tubes in use, one running spare).

Tubes J

in

C-1

( )

is

a complete portable

The

superheterodyne re·

of

voice and tone

as continuous wave (

The

crystal-controlled oscillator power is

designed only for c- w transmis-

LIST

OF

COMPON

s.

Component

s,

set consisting

Ediswan base to American prong.

FU-26, 1-a

in use, three running spares contained

JAN-6}5

ng

JAN-807

AN

-6S

use, one running spare).

of

the following:

RT-30(

mp, 250-v, type 3AG,

Y<~-watt,

0.25-amp, 6·8-v,

(VT-94)

spare).

(VT-100-A)

L7GT

) /

PRC-1, in·

(contained in ac·

V7

(VT-229)

(two

(one

V2

V6

c-w)

111

tn

(one

Quan.

2 Tubes

usc, one running

2 Tubes

use, one

2 Tubes

use, one running spa

2 Tubes

in

use,' one running spare).

-

Rectifier eluding the following:

4 Fus

2 Tubes

Te

2

Power

es,

use, three running spa r

JAN-5R4GY

spare, one in use) .

chnical Manual for Radio

Component

JAN-6V6

JAN

running

JAN-6SA7

JAN

5-amp, 250-v, type 3AG,

-6SK7

-6SG7

Unit

(VT-107)

spare).

(VT

- 117)

spare).

(VT-150)

re).

(VT

-211)

PP-36

es).

(VB)

Set

( ) /

(one

AN

Vl

PRC-1.

( ) .

3. RANGE.

a. Receiver. Because

operating range AN

/ PRC

-1

conditions.

b. Transmitter.

mitter portion

upon various factors, frequency, time

of

the

year. In general, the minimum reliable operating

of

range

tween 2 to 4 me is approximately operating on higher frequencies, the transmitter of

4. FREQUENCY COVERAGE.

variable from 2 to 12 me, covered in two overlapping

bands:

(.1) Low-frequency bancl- 2

(2) High-frequency band- 5 to 12.0 me.

the transmitter operating on any frequency be.

covering distances

a. Receiver.

of

( )

is

of

Radio Set AN/

of

clay,

The

of

its extreme sensitivity,

the

receiver portion

limited only by prevailing reception

The

operating range

PRC-1

the

most important

antenna installation, and season

up

to several thousand miles.

frequency range is continuously

to

5.25 me.

of

( )

is

of

which are:

50 miles.

(one

V5

(one

V4

(one

V3

(one

in.

(one

running

/ PRC-1

the

Radio Set

the

trans-

dependent

When

is

capable

in

/

1

b. Transmitter.

can

be operated on any frequency between 2 to 12.0 inclusive. Operation mental crystal f reguency or its

crystal frequency).

the

The

crystal-controlled transmitter

is

effected on either the funda-

Th<:

second

ran~c

harmonic (twice

is

cove

red

bands:

(1)

Low-frequen

(2)

High-frequen

5.

POWER

cy

band 2

cy

SOURCE.

to 5 me.

hand S to 12.0

me.

Radio Set AN/ PRC-1 ( ) operates through its selfcontained power supply, Rectifier Power Unit /PRC-1, source

6.

justed on and 250. The receiver requires watts, at

connected

of

from

115

POWER

a.

Rectifier Power Unit

any

INPUT

by

means

of

the following voltages: 115,

LlO

volts, 60

to

an

alternatin~

to

250

volts.

current (a-c) power

.

PP-36

( )

jPRC-

a rotary selector switch for operation

approx1m:ately

cycle.

Under key-down condi-

1 can

15?,

PP-36(

200, 220,

tions the power requirement for the transmitter proximately 210 watts at 1 I 0 volts, 60 tinuous operation, it frequency be

bet

ween

is

important that the power-llne

50

and 60

Intermittent operation, however, can

40-cycle

current provided the working penods do not

cycles.

cycles

per second (cps) ·

be

e~ected

For

exceed the following time limits:

1)

Transmitter

(

(2)

Receiver

·······································

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

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

.

10 30

minutes. minmtes.

me,

in

two

)

be

ad.

125

is

ap-

c~n

on

In

order

to

b.

to

age

the power transformer, at least 4 hours must elapse between nating curr

NOTE:

Th~:

An)' attempt supply and might cause irreparable damage transformer. Check carefully power is ac. make this check.

c.

Principal Power Supply Lines in Foreign Coun-

tries. The

light sockets and are shown in Table I. These

chan~ed

general

at

they be maintained for the electri and eguipments

may,

There

feeding

a given area standard lines. The location may

possibly

therefore the

in

paragraph

a

d. Table I

volts,

a-c

prevent overheating and possible dam.

succcs~ive

operations

on

40-cycle alter-

ent.

radio set cannot

to

do

so will

Sec

the

pow

er supp base

any

time

b~:

burn

nmc

in paragraph 33

lies

plu~s

in

du<:

to

wartime cond

operawd

out the

to

on

fuse:

b~:

sure

direct current.

in the to the

normally available from

various foreign countri

valu

es

may vary

should hold true since proper supply must

ca

l devices, transformers,

used

by

a given city, town, or area.

of course,

be

which

supplied

emergency circuits

do not

chosen

by

these emergency circuits,

usc

for the radio set

line voltage checking procedure outlined

33

should

always

be followed.

is

divided into four columns: territory, d.c

volts, and frequency. Where

an

precedes a number it indicates the type of supply and

vo

ltage

predominatin~.

power

the

power

available

on

how

to

es

or be

itions, but in

in

usc

for

the existing

asterisk (

*)

•

TERRITORY

--

NORTH

AMERICA

Alaska

British Honduras

Canada

Costa Rica Cuba Dominican Republic Guatemala Haiti

Hondura~

Mexico Newfoundland Nicaragua Panama (Republic)

Panama (Canal Pucno

Rico

Salvador

Virgin

Islands

2

Zone)

PRINCIPAL

D. C.

L!O

110 110 110, 220 110 220, 125

110,220 110,220

110

110, 220 110,220 110,220

POWER

VOLTS

TABLE

SUPPLY

I

LINES

IN

A.

-

110, 220

*110, 150, 115,230 *110 *110, 220 * 110, 220 *110, 220

110.220 *110,220 *110, 125, 115,220

110, I

*110

110,220 110

*110

FOREIGN

C.

VOl.TS

15

COUNTRIES

,230

-

FREQUENCY

-

60

60, 25 60 60 60

60, 50 60,50 60 60, 50 50,60 60 60, 50 25 60 60

TERRITORY

WEST INDIES

Bahamas I'·

Barbados Bermuda Curacao Jamaica

Martinique Trinidad

SOUTH

AMERICA

Argemina

Bolivia

Brazil Chile Co

lombia Ecuador Paraguay

Peru

Uwguay Ven

ezue

la

EUROPE

Albania

Au

stria

Az

ores

ium

Belg

Bulgaria Cyprus (Br.) Czechoslovakia

Denmark

Eswnia

Finland

Fran

ce Germany Gibraltar Greece

Hungary Iceland Irish Free It

State

aly Latvia Lithuania Malw Monnco Netherlands Norway Poland Portugal Rumania Russia

Spain Sweden

Switzerland

Turkey

United Kingd Yugoslavia

ASIA

Arabia

British Malaya

Fed. Malay Non-Fed. Malay States

om

Su11es

D.

C.

VOLTS

'

110

*220

110

220, 110

*220

220, 110 220

110

,220

220 220, 110, 150

220 220, 110, 120 220, 120

*220

220, 120, 150, 110

220, 110 *220, 110 *120, 220, 110

110, 220, 120, 220, 110, 120, 250

440 *220, 110, 150

220, 110, 120

*220

I

10,

125, 220, 110 220, 110

220 220 220, 110 220, 150, 125

110,105,120

*220,

220, 110, 120, 115, 250

*110, 120,

220, 110, 120, 220, 120, 110, 150 110, 220 230,220,240

110, 120

230

125

15~

220,

11~

105

115, 250

25~

160

.

A. C. VOLTS

-

--

115 11

0 110 127 11

0

* 110

110, 220

*220,

225

*110, 220

127, 120, 220 *220 *110, 220, 150

110

220

*220, 110 *2

20

*110

125, 150

*220, *220, 120, 127, 110

220

*220,

12

7, 110,

11{

*220, 120, 150

110 *220, 110, 115, 127 *220, 120,

220, 127

220,120,115, 110 *110, *220, 127, *110 *127, 110, 220 * 100, 105,

220 *220,

*150, 125,.120, 110, 115, *220, 120 *220

105 110

220, 120, 127 *220, 230, 130, *220, 120, 110

I

*220, 110, 125

120, 220, 110, 115, 105 *120, 110, 220 *120, 125,150, *220,

*120, 220, 145, 150, 110, 120 *220, 110 *230, 240, * 120,

230

12

7

11

5,

120, 125, 220, 230 120, 110

110,2

20,120

?OO

127,110

11

12

7, 110, 125

others

220,00

0. 115,220,

135

120,260

, 120, 150

130

,220,

135

FREQUENCY

60

50

60 50 50 40,60 60

50,60,43

50,60

50,60 60,50

60, 50

50 60, 50

50

60

50

50 50 50,40 50

50

50, 42 50 50 50

25

50,

25

76

50

42, 50

50 50

42, 50,

45

50

100 42

50

50 50

50,42 50,42 50 50 50, 20, 25 50,40 50 5

0,25,4

0

50,42

50

50,60,40

3

TERRITORY

D. C. VOLTS

A.

C. VOLTS FREQUENCY

ASIA-con!"

Ceylon China Hawaii

India Fr.

I ran

Iraq

Japan Manchuria

Palestine Philippine Island s Syria Siam

Turkev

AFRICA

Angola Algeria

Belgian British West Africa British East Africa Canary Islands Egypt Ethiopia (Abyssinia) Italian Africa

Cyrenaica Eritrea Libya

Somali land Morocco Morocco (Spanish) Madagascar Senegal

Tunisia Union

OCEANIA

Australia

New Victoria Queensland South Australia West Tasmania

New

Fiji Islands Society Islands Samoa

d.

Straits Settlements North

Borneo

Ind

o China

(Persia)

(P

ort.)

Congo

(Tripoli)

(Fr.)

of

South Africa

South Wales

Australia

Zealand

*230

220 220, 110

220,110,225,230,250 110, 120, 220, 240 220, 110

*220, 200

100

llO

220,

220

"'220 *220

110

220

150

120 110 200

230

220,230,240,

*240

230 220, 240 200,230,220

*220, 110, 230

230 230 240, 110, 250

110 •

230

110

230

*110, 200, 220

110,220

230, 220, 110, others

*120, 220, 110, 115, 240

220

220,230

* 100, 110

110 220 220

110, 115, 220

100

"'220, 110

110

* 115, 110,

220 230 240

127, 110

*

200, 110, 220, I 220, 250

* 110, 150

127

125, 110, 270

*230

115, 110

127, 110, 115

*

120 120

110 50

*220,230,2-10

*2-10 *230 *240

*200, 230,2-10

250 *240 *230

120

110

127

10

50 60 50,60 50,

60,25 60,25 50,

25

50 50 50 50,60 60,50,25

50

60

50

50 50

50 50 60

50 50 50

50,40

50

50,42,45

50 50 50 50 50

50

50 50

40

50 50

60

50

7. POWER OUTPUT.

a.

Rec

eiver.

25

milliwatt

b.

Transmitter.

mitter is not

2 to

12

me.

The

s.

Jess

than 30 watts

4

power

The

power output

output

of

the receiver is

of

at

any frequency from

the trans-

8.

WEIGHT.

Radio Set AN/P approximately as follows:

a.

The

carrying case with about six

Gel is packed in

RC

1

35 pounds.

a

snug

fitting corrugated case, then in a

()

set

The

up

for

operation, weighs

set is packed

pounds

for

export

of

Silica

CONTINENTAL

Fig:~re

2.

EDISWAN

Linu cord adapters.

vapor·proof foil barrier, then in a

case.

This unit

is

packed

in

having inside dimensions approximately

R~"·

This

overseas

wooden

resistant liner. One Crystal containing a set of 47 packed same we

a large

packed

kit packed

9.

in

a similar manner

wooden

overseas

ighs about 76 pounds.

Every

b.

sixth radio set

wooden

case,

spare parts for

case

measures

for export weighs about 270

ADAPTERS

(fig.

A set of molded l

in

the left-hand The line PP-36( with standard the radio arc

in

usc,

cord

associated

)/PRC-1

American

set

in countries where other el

it

is

necessary

between the line-cord

crystals

is

case.

This

is

packed

with compartments into

five

radio

21Vsn

x 27Ys" x

2).

ine-cord

accessory

plug adapters

compartment (figs. 2 and

with

is

terminated with a

type

prongs. In order to

to

interpose a suitable adapter

plug and the available

~ccond

an

overseas

box also

Case

CY-86/TRC-JO

corrugated

wooden

27Yf

' x 19" x

has a water-

case

individually vapor-proof

also parked

comp

in

lete

overseas

a spare

inside

Farts

unit

kit,

which

sets.

This

spare

parh

28¥<1"

and

when

pounds.

is

supplied

3).

the

R<.-ctifier

Power

plug

Unit

fitted

usc

ectrical

standards

electric:1l

the

arc

outlet.

a.

The adapter with continental

to

the American plug except that the prongs

type

prongs

is

are

similar

round

and slotted.

b. The adapter with English

similar

to

type

prongs

is the continental plug except that the prongs are smaller in

diameter and somewhat longer.

Ed

iswan

base

c. The

type

having radial l

adapter

ock-in

d. The attachment plug

the radio set to standard Edison

is

pins.

body per

of the

mits

base

double-contact

connection

socket

outlets.

of

--~~-l~rl,~&z'

Figure

3.

Adaptur

10. ANTENNA.

The antenna supplied with

in

the left-hand

accessory

ill

left-baud romp.Irtmem.

Radio

Set

AN/PRC-1 ( )

compartment (figs. 4 and

9)

consists of 150 feet of cotton-covered tinned copper

wire, wound on a

is

the wire is

attached to a porcelain antenna insulator. A cotton

line order far

end of the antenna

terminated with a phone tip; the other end

20

feel

long

to

provide a convenient

wooden

is

tied

handreel. One end of

to

the antenna insulator

means

for

to

the support selected.

s<.-curing

the

'

in

5

11

. CARRYING

a.

The

made

of

fabric.covered plywood.

CASE

.

case housing Radio Set

AN/PRC-1

The strongest possible construction consistent duced weight.

aluminum framework and

receiver, transmitter, and

Set AN/ PRC- 1 ( ) (fig. sory compartments are provided. sory compartment (figs. 3 and

1)

Adapters, set.

( (2)

Antenna.

3)

Headset.

( (4)

Key.

b.

The

interior

of

the case is fitted with an

brackets for supporting the

rectifier power unit

8).

In

addition, two a

The

9)

contains:

right-hand accessory compartment (fig.

contains:

1)

Set spare tubes for receiver.

( (2)

Set spare tubes for transmitter.

3)

Spare rectifier tube for rectifier power unit.

(

( 4 J Spare neon bulbs.

5)

Spare dial and panel lamps.

(

c. A complete schematic diagram

ANjPRC

cover

12

a.

to

the

- 1 ( )

of

the case.

. HEADSET

Headset

fit

closely to the

is

affixed to the interior

HS-30

HS-

!fig. 6).

30

is

a light-weight headset designed

ope

rator's head.

headset are fitted with special

The

soft

designed to fit lightly in the operator's e exclude outs ide nois

a headband

made

es. The

of

a thin strip

be shaped to fit the contour

of

headset

the

is

of

steel so

wearer's head. A clip,

( )

case

is

of

the

wit:h

its re-

of

Radio

cce

left-hand acces.

5)

of

Radio Set

of

the

hinged

receivers

of rubber plugs ar

cavities to

provided with

tbat

it

can

a~ed

to

~he

headset cord can be attached to the opera-

is

tors

clothmg to relieve the pull and weight

from the operator's

ears.

the left-hand accessory compartment.

b.

For use with Radio Set AN/ PRC- L ( ) , Headset

~S-30

m_

s.

w1th

13.

~oth

IS

CD

.

1n ca

14. RECEIVER-TRANSMITTER WITH

of in the tro

front

is

supplied with Cord

Plug PL- 55. The impedance

Cord

KEY

a. K

ey. J-37

tens1

CD-605

J-37

on

is

approximately 4000 ohms.

(flg.

7).

is

a standard telegraph

and spacing

mounted on a bakelite base and

- 201-

A.

b.

Cord CD-201- A is 18 inches long and terminates

Plug PL-55. The key, with its mount and cord

rried

in

the left-hand accessory compartment. '

CASE

(flg. 8

1.

a.

Receiver-Transmitter RT-

the

radio chassis and front panel

lugga

ge

fabri

c-c

overed carrying case. All con.

is,

jacks, terminals, and meter are mounted on the

panel.

of

The headset

is

contained in

CD-605 which terminates

of

Headset HS-3

key,

adjustable for

of

the contact arm.

is

fitted with Cord

RT-30( 1/PRC

30(

) / PRC- 1 consists

of

the set mounted

the cord

The

key

- 1

0

is

Fig11re 4.

Antetlll

tl 0

11

reel.

Fig11re

5. Rigbt-b

a11d

aueuory

compartment.

6

( 1)

The

receiver portion

of

the radio

set

consists five-tube superheterodyne receiver designed for performance reception

signals within the frequency range

(2)

The

transmitter portion

of

a two-tube crystal-controlled oscillator power-ampli-

11er

combination designed for c.w transmission

intelligence within

b. Receiver-Transmitter

on

a sin

gle

panel receiver mounted mitter the

and

all

on

the left-hand side

and

its components and controls are mounted

right-band side.

of

amplitude-modulated and c.w

the

frequency range

RT

by

means

of

its components

The

separate chassis are attached

of

2 to 12

of

the radio set consists

of

2 to 12 me.

-30(

)/PRC-1

of

separate

of

the panel; the trans-

chas'sis.

and

controls are

is mounted

to the panel with machine screws.

c.'

The

panel supporting the receiver and transmitter

chassis

is

held

in

place

in

the case by means

screws.

Fig11re

me.

of

6. Headset

of

a

high-

of

The

on

six

HS-30.

d. Receiver-Transmitter with all tub are held

e.

A complete set

lamps

unit is contained

for

es

and dial lights installed.

in

pla

ce

by

the

receiver, transmitter, and rectifier power

in the right-hand accessory compart-

ment.

RT-30(

)PRC

- 1 is shipped The

clips

or

clamps.

of

spare tubes, neon famps, and dial

tubes

Figure 7. Key f- 37

7

Pig

me

s.

Rectifiel'

Potver

Unit PP-36( ) /PRC- 1

(//ld

Receive~·-Trnmmitter

RT-

30(

)/PRC- J .

15.

RECTIFIER

Rectifier Power Unit PPthe power unit and its ce

nter compartment power unit provides a source plate, screen-grid and bias voltage for both the transmitter

and voltage for the transmitter, Full-wave rectification is employed. for operation voltages through All controls, switches, and fuse posts are mounted on

the front panel connection between the power unit

8

POWER

receiver

of

the power

of

UNIT

PP-

36( )/PRC

36(

) / PRC- 1 consists

front

panel mounted

of

the carrying case.

of

filtered, rect1fied

as

well as a source

receiver,

unit

on

the

adjustment

the power unit (fig.

of

- 1.

of

in

the upper-

Th

e. recti tier

a-c

of

a-c filament

and

power unit.

Provision is made

various

a selector sw1tch.

and

a-c

i~put

9).

Inter-

the receiver

. tnd transmitter is made in

a polarized plug which

receptacle on the chassis

1

6.

CONTROL

All

operatinJ.: controls, jacks, indicating meter and

fuse posts are mounted

Transmitter

Unit

PP

when .the

operatmg control knobs associated with the rectifier

power unit bear trol

RT

knobs assoCiated with Receiver-Transmitter

-

30(

S lflg. 9

RT -30(

- 36.( ) h1n

gcd cover

/PRC

letter. designations.

) / PRC 1 bear

by

means

of

a cable ending

fits

into a

of

the receiver-transmitter.

c

orrespondin~

).

on

the front panels

)/ PRC- 1, and the Rectifi

- 1. These items are visible only of

the housing is opened.

(The

1111111ber

designations.)

of

Rec~iver

er

Power

The

operating con-

Pig11rc

9.

Prl?nt

panels

17. LINE

Control knob A, th e line switch, the primary of the power transformer for a.c power sources delivering 115,

SWITCH A.

is

used to adjust

operation on

150, 200, 220, and

250 volts. Counterclockwise rotation of the knob

pr

adjusts the rotary switch to connections at the calibration points indicated pane

l.

The

legend LINE

ly

panel immediate

18. ON

OFF

Control knob

above the control knob.

B.

B,

the

ogressively higher voltag'

SWITCH

ON

OFF

is

switch, is used to con-

painted

on

the the

nect the rectifier power unit and hence the radio transmitter and receiver to its source of primary power.

19. REC

. TUNING 1.

Control knob 1 actuates the tuning dial mechanism

of the receiver. The legend

REC.

TUNING

is painted

on the panel immediately below the control knob. The

dia

l is calibrated directly in terms

of frequency. A

in

open

carrying case.

is

separate calibrated scale

two bands covered

20

. BAND SWITCH 2.

Control knob 2

by

is

operation on either one

provided for each

the receiver.

used to adjust the receiver for

of

the two frequency bands

covered.

21. VOLUME 3.

Control knob 3 is the volume control Clockwise rotation of receiver sensitivity

the

control knob increases the

and

the amplitude of the audio signal

of

the

receiver.

delivered to the headphones.

22 .

CAL.

CW.

PHONE

4.

a. Control knob 4 actuates a rotary selector switch

used to adjust the receiver.

(1)

With

ceiver

the switch in the

is

capable of receiving amplitude-modulated

PHONE

position,

nals only.

of

the

re.

sig.

9

(2)

When coming signal produces phones corresponding to the keyed signal impulses.

(

3) plate·voltage delivered to the receiver is reduced, causing a correspond ing decrease in the sensitivity of the receiver. Calibration recep the transmitter crysta it

with the dial calibration, and adjusting the dial hair-

line,

23. METER

a.

which connects an indicating meter in various circuits of

the transmitter. Inserti

circui

control knob.

b.

LINE nitude un

it by the

may be set on the correct tap.

delivers direct current, this condition by the abnormal behavior

33)

.

c.

PLT. VOL. position, the meter indicates

rectified a-c voltage delivered by Rect

P

P-36( )/PRC-1

PRC-1.

d.

O

SC. drawn by the plate tube in the transmitter portion RT

-30( )/PRC-1. portant of the crystal and the correct adjustment of the plate

tank circuit

e.

AMP. GRID

cu

rrent drawn by the transmitter power ampliifier. meter reading therefore shows the magnitu excitation voltage delivered to the transmitter Class C

power amplifier by the crystal-controlled oscillator. Simultaneousl portant function

the switch is in the CW. position, the in-

an

audible note in the head-

When

ti

if

With

the switch is

on

of a signal of known frequency generated by

necessary

Control knob 5 operates a rotary selector switch

ts

is

(par

SWITCH

shown by the position of the awow on the

AMP. AMP

OS PLT. VOL. LINE

Wi

th the arrow

VOLTS position, the meter indicates the mag-

of

the voltage delivered to the recti

a.c

power source,

the arrow

to Receiver-Transmitt

the arrow

PLT. CUR. position, the meter reads

of

fun<!t:ion

is

to

of

the transmitter oscillator.

the arrow of the control knob pointing to the

CUR

. position, the meter reads the grid

y,

the meter reading pe rforms the im-

of

indicating the correct adjustment

in

the

CAL_.

position, the

of

the receiver is made through

l-

controlled oscillator, comparing

. 40 ) .

5.

on

of

the meter

PLT.

CUR

. GRID

C.

PL

of

the control knob pointing to the

T.

CUR.

VOLTS

so

CUR.

the

If

of

the meter po:inter (par.

of

the control knob pointing

of

the control knob pointing to the

the crystal-controlled oscillator

of

Receiver-Transmitter

A simultaneous and equally im-

indicate the oscillatory condition

in

1the various

.

Jier

power

LINE

SWITCH

the power source

is

m~lde

known

to

tlhe

filtered

i.fier

er

p,ower

R'T

the

tde

Unit

-30(

current

The

of

the

)/

r-f

of

the plate-tank circuit stage.

f.

With

the arrow

AMP. PLT. CUR. position, the meter reads the plate

current drawn by the transmitter Class C power

fier. Simultaneously, the meter reading indicates the correct adjustment of the power-amplifier plate-tank circuit and the optimum degree antenna coupling system.

24.

OSC

. TUNING

Control knob 6 drives the transmitter oscillator plate-

tank capacitor. line on

on the panel provides an approximate indication of the resonant frequency to which the oscillator tank circuit is adjusted. two frequency ranges corresponding to the two quency bands covered by the transmitter. corresponds to the low-frequency band the other scale corresponds to the high-frequency band

( 5 to 12

brations, a certain amount

vided.

25.

A

mitter

2

plate-tank capacitor.

provides an approximate indication

quency to which the power-amplifier plate circuit justed.

frequency ranges corresponding to the two frequency bands covered by the transmitter. to the low-freque correspoq.ds to the high-frequency band (5 to 12 Although not indicated amount

27. BAND

on legend mediately below the control knob.

28

ciated with the antenna-loading system in the transmitter part

wise rotation

tl~e

knob with the dual-calibrated scale painted

The

me).

LIGHTS

Control knob 7

6.

AMP

Control knob 8 drives the transmitter power-amplifier

Control knob 9 adjusts the transmitter for operation

either one

. ANT. SWI

Control knob J o actuates a rotary selector switch asso.

of

7.

and

receiver panel lights.

. TUNING 8.

The

of

frequency overlap is provided.

SWITCH

of

BAND SWI

Receiver-Transmitter

of

the crystal-controlled oscillator

of

the control knob pointing to the

of

its loading by the

6.

The

relative position

dual-calibrated scale

of

is

(2 to 5.0 me) ;

Although not indicated by the dial cali-

of

frequency overlap

is

the pane l light switch for the trans-

The

po~ition

dual-calibrated scale

ncy

band (2 to 5

by

the dial calibration, a certain

9.

the two frequency bands covered.

TCH

is

TCH 10.

of

the control knob

One

painted

RT-30(

from

of

the indicator line

of

the resonant fre-

is

divided into two

scale corresponds

me);

the other scale

on

the panel i

)/PRC-1.

its initial point

ampli-

the indicator

divided into

fre-

One

sca

is

pro-

is

ad-

me).

The

m-

Clock-

le

lO

with the arrow pointing to l dcueases the inductance in series with the antenna, causing crease in the effective electrical length

switch points are provided.

Six SWITCH the control knob.

29.

Control knob 11 drives the variable capacitor asso-

ciated with the antenna-tuning system in the tramsmitter

part Clockwise rotation

point with the indicator line engraved on the skirlt control knob pointing to capacitance in the antenna.tuning circuit.

3

0.

Control knob 12 actuates a switch which turns the transmitter ceiver off when in the

31.

In elements directly associated with the operation Set

AN/PRC-1 the Rectifier panel

a . An extractor fuse post

panel

The

in the primary circuit

is

painted on the panel immediately below

ANT. TUNING

of

the Receiver-Transmitter

SEND REC.

off when

MISCELLANEOUS

addition to the controls mentioned, the folllowing

Power Unil

of

Receiver-Transmitter

of

the Rectifier Power Unit

fuse associated with the extractor post

11.

of

the control knob from its initial

0, results in an increase

12 .

in

the REC. position and the

SEND

MARKINGS.

( ) are located on the front panel of

PP-36(

of

the power transformer. Re.

a corresponding de.

of

the antenna.

The

legend

RT-30(

position.

)/PRC-1

RT-30(

is

provided on the front

PP-36(

)/PRC-1.

otf

and on the

)/PRC-l.

)/lPRC-1.

is

connected

ANT.

of

the

Radio

of

placement

counterclockwise rotation

FUSE, removal

a .new element.

b.

The

Transmitter

jack marked

or

high-impedance output connections are underneath

the receiver chassis.

c.

The

part

of

serted in the keying relay circuit at the jack marked KEY

located on the front panel.

in

re-

d. An extractor fuse post

panel

o( fuse associated with the extractor post the plate circuit fier.

Replacement through counterclockwise rotation marked section

of

e.

A crystal socket Receiver-Transmitter above the legend CRYSTAL painted on the panel. The crystal socket provides

crystal in use, in connection with the crystal-controlled

osciJlator in the transmitter

RT-30(

f.

An are provided on the front panel RT-30( responding legends

a blown fuse

of

the defective fuse, and insertion

audio output

RT-30(

PHONE

key

Receiver-Transmitter

FUSE, removal

)/PRC-1

located on the front panel. Low.

used in conjunction with the transmitter

of

the transmitter class C power ampli-

of

a new element. .

is

RT-30(

)/PRC-1.

antenna binding post and a ground binding post

)/PRC-1

immediately to the

ANT.

is

accomplished through

of

the small knob engraved

of

the receiver part

is

made available

RT-30(

is RT-30(

a blown fuse is accomplished

of

the defective fuse, and

located

)/PRC-1

provided on the

)/PRC-1.

of

the small knob

on

the front panel

a connector receptacle for the

part

of

Receiver-Transmitter

of

Receiver-Transmitter

left

and

GROUND.

of

Receiver-

is

connected

immediately

of

the

at

the

is

in.

front

The

in.

of

cor-

of

in

11

SECTION

II

INSTALLATION

32. INITIAL

Unpack damage compone

a . Radio Set

installed. with the exception in place is

held

b. Five Crystal Holders

upper left.hand compartment, along with the plug adapters, headset, is

· shipped inserted in the crystal.holder socket on the

panel

of

c. The spare tubes, fuses, pilot lights, and neon bulbs

are contained in the upper right-hand compartment.

INSTALLATION

33.

AND

RECTIFIER

The

case housing the transmitter, receiver, and rectifier

power unit may be installed in any convenient position. The most suitable position when the case erably on a desk or table Having selected a suitable location for the the two clasps with the luggage key and of

the

accordance with the following steps:

a.

Make certain that the power supply

switch knob B

b. Set LINE

c. Rotate the METER

LINE VOLTS position.

d. Unwind the line cord from the two brackets pro.

on

vided

-36(

PP

long.

e.

Inspect the power source and select a suitable

adapter for the line cord plug

is other than the U.

used

PROCEDURE

.

the equipment carefully to prevent loss or

of

the components. Check against the list of

nt

s in paragraph

AN/PRC-1

The

tubes in the receiver and the transmitter,

by

clips. The transmitter power-amplifier tube

in

place

by

a clamp.

key,

Receiver.Transmitter RT-

POWER

is

mounted on a horizontal plane, pref.

2.

See

figure

1.

( )

is

shipped with all tubes

of

the power-amplifier tube, are held

FT-243

are contained in the

and antenna reel. A sixth crystal

30(

)/PRC-1.

OF

RECEIVER-TRANSMITTER

UNIT

.

for

operation

of

a height suitable for writing.

is

case,

lift

case.

Proceed with the installation exactly in

is

in the

OFF

position.

SW

ITCH

control knob A to 250.

the front, panel

)/PR

C-1.

The

SWITCH

line cord provided is

S.

control knob 5 to the

of

Rectifier Power Unit

if

the electrical system

standards.

obtained

open

the cover

ON

OFF

25

feet

AND

f. Insert the line.cord

OPERATION

plug

(through the adapter, if

needed) in the power outlet and observe the voltage

by

reading indicated

NOTE:

If

the meter pointer swings to either extreme end

of the meter scale the power source delivers direct current.

funher

As a plug

in

the receptacle. Assuming to

traveled

the polarity

pointer will now travel meter scale. Radio operation on alternating current only.

TEMPI' TO OPERATE

g.

the extreme right

of

Having determined the line voltage through the

procedure given in subparagraph

the meter.

check, reverse

the line-cord

Set

AN/PRC-1

IT

the

polarity

that

end

of

the meter scale before

plug

was reversed, the meter

to

the extreme left

ON

A D-C

of

the line cord

the meter pointer

end

( ) is designed for

DO NOT POJIYER

f above, rotate the

LINE SWITCH control knob A to the position marked

by

with the input voltage indicated

It

is

not probable that the meter reading will correspond exactly to any of the input voltages painted in connection with the

case,

In this

set the switch on the tap nearest the indi.

LINE

SWITCH contro l knob A.

the meter reading.

on

cated voltage.

h.

Remove the headset,

key,

antenna reel, ground wire, and selected crystal from the upper left-hand accessory compartment. Insert the phone cord plug in the jack marked

PHONE;

the key cord plug in

t~e

jack marked

KEY.

34.

INSTALLATION

a.

Optimum performance

lesser extent,

of antenna and ground installations. Ideally, the antenna shou

ld

be located in a horizontal plane, at a height 20 to 40 feet above the surface of

any nearby objects. Further, the plane should be broadside to the direction in which the trans. mitter intelligence be

cut to the following lengths for best transmission and

reception in relation to frequency:

Op

erating frequencies Antenna length

to

2 3 to 7 me

7 to

OF

ANTENNA.

of

the transmitter and, to a

the receiver

is

dependent upon proper

of

is

to be sent.

3 me .................................

...

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

12

me

·····-······

···

···········

··· .. 50 feet

the earth and clear

of

the antenna

The

antenna should

1

~0

feet

.. 1 00

feet

of

the

AT·

LINE.

the panel

of

12

b.

The

length

Figure 10. Rndio Set

of

antenna best suited for optimum

AN/PRC-1

transmitter performance at any frequency within the range covered is that which will result in proper loading of

the plate tank circuit

.tier,

with the arrow the 6 tap, and with the indicator line pointing to the 0 mark

It

is

realized that this condition

dinarily impossible to achieve

of

the transmitter power ampli-

of

the control knob 10 pointing to

of

control knob

of

the linearly calibrated scale.

is

difficult and or-

in

practice, and for this

11

reason the antenna-tuning circuit has been incorporated

in the transmitter part /

PRC-1

in

order to electrically lengthen the antenna.

of

Receiver-Transmitter

RT-30(

c. For best results try to locate the horizontal antenna in such a position that tion

in

which communication is to take place. Avoid

installing the antenna so that

it

will be broadside to

it

points toward tbe de.

the

direc.

( ) iiiJtnlled for oporntion.

of

sired direction

communication. A convenient means to determine the correct orientation antenna

is

to locate

it

for optimum reception from a

transmitter located in the same part

which you wish to transmit.

d.

It

is

realized

stall

an

antenna meeting any of the requirements out-

lined. In such cases,

that

it

will often be impossible

it

is

following expedients be used, bearing in

vantages and disadvantages

)

(

1)

The

antenna wire may be laid upon the ground, provided the ground ment

of

the wire

of

the transmitter is reduced, and

is

relatively

of

is

not wet. In this case, conceal-

load the plate tank circuit amplifier properly.

of

the horizontal

of

the world to

suggested

that

one

mind

each.

easy.

The

potential range

it

may be difficult to

of

the transmitter power

to

in-

of

the

the ad-

13

(2)

If

antenna sibility of ever,

the.

the building is of may

be

instaJled in

concealing the wire

wire

may

be

laid

wooden

side.

upon

Ordmanly,

is

not

the

c?ns~ructio

n

the

very

good. How.

course

of the mold.

ing or other decorative trim. . . . .

(3)

It

may

sometimes antenna or abandoned wire poses. of people accustom e tenna the antenna antenna

This opportunity is good from the

concealment or disguise of the antenna wue,

in

the neighborhood will

ed

to

seeing the antenna. In

ver,

it will

Jead.in

be

is

connected

wire from its point of connect

to

its point of entrance

is

not wire at the antenna supplied with lead-in

(

4)

The antenna wire

Radio

wire.

roof of the building provided the roof

is

of

wood

or other

too,

the potential range of the duced, and conditions power amplifi

(

5) vided event that the

The

that

it

may

in

the plate tank circuit of the transmitter

er.

use

of a vertical antenna IS permissible pro.

it

is kept

equ try to support the building etc.)

whi

by

ch

means should

erties of a vertical antenna are

those of a horizontal antenna. Optimum dir will

be

obtained, however, when the antenna

on

the side of the building

the transmitted intelligence

e.

A great deal of reliance

ity

nod

genu

must be

training of

examined

instnllation that c

f.

If

possible, a ground connection a water pipe, steam pipe, radiator, or s stem

connected

y . I . . d

a good ground will often

Th

g.

esame

an

. d . connected to the binding post

t

recep

1011,

an

tS .

front panel of R immediately to the left ground is

is

used

for both tr

connected to the binding post

Receiver-Transmitter

be

possible

once

to used

have

utd1ze

for other

lon_g

th1s

necessary

in

to determine whether the an.

to a

radio

use,

simply

and

receiver

substitute

in

to

the building.

disconnect the l

the

Set AN/ PRC-1 ( ) , using it

may

be

laid

on the surface of the

is

nonm

eta

lli

c construct

trans~itter

be

difficult

to

obta10

proper

. _ _

clear

of

ipment is to

antenmt

away

nearby

be

objects. located from the si

of a short pole (broom

be

nonmetal!ic. The directive prop-

jrtcin

the

very carefully.

ircumstances

consider

g the direction

is

to

be sent.

must

operator. The possibilities

Select

permit.

be

ably

placed

the

sho

uld

any

to

the

eartl1.

na is

leo

eceiver.Transmttter

of

RT

-30(

This is important

resLut

m tn

crease

used

for both tr

RT-30( ) /PRC-

the legend ANT.

ansmission

and

on

the front panel of

)/PRC-1

immediately

ansm1sston

receptiOn,

an

existing

s~an

dp?inl

since

case,

use.

Follow

ion

at the

If

ead-in

antenna wire

not

wet,

ion.

w

ill

be

loa~wg

In the

in a building,

de

of the

~an~le

,

l

ess

ectiv

is located

in

which

on

the in.

best

antenna

be

made

other m

etal

r~n~e.

on

T~e

the left of the legend GROUND.

,

the

pos-

pur-

smce

been

how.

the

as

and

Here,

_re.

cane,

than

ity

to

lic

since

and

the

same

and

to

35. ADDITIONAL INFORMATION.

a.

In

the

event that operation reception, receiver along the

b. In

for long distance

c.

l

ected,

if n

36.

a.

in

stallation of the set

prepare the set f

(1)

power

a

cated

(2)

the

( 3)

knob B so

( 4) Assuming

was in

g should

(5)

fair performance

with

an

antenna

floor

or dropped out of a window.

many

cases a 40

transmission.

No matter what

arrange it

so

type

that it

ecessary.

PREPARATION OF

Preliminary Preparations. Having completed the

as

or

usc

as

Set

the

UNE

SWITCH control

unit)

to

the corr

by the m

Set

arrow

Set

set

eter reading.

the

METER SWIT

points

the

rectifier

that

the th

to

the

proper

be

appr

lo

the

PLT.

power

arrow points to the

at

the LINE SWIT

input voltage

oximately

Allow the equipment

period of approximately 4 minute

b. Checking Receiver.

(1)

Set

control

(2)

Set

(3)

Set

(

4)

Rotate control

the

until static)

is hea

( 5)

Rotate control

the

eve

nt that the r

(

c-w

) transmitt binations will tuned to heterodyne whistle adjust control

knob

12

control

knob 4 to

control knob 2

knob 3 in

background

rd

in

the head

noise

knob

eceiver

er,

the characteristic dot and dash com.

be

observed.

speech-modulated

wi

ll

knob 4 so

PIIONE position. The h

perm

appear, thus modulated sig

(6)

Repeat steps

2 adjusted so that

itting

nal

s.

(2), (4), and

its arrow points to the 5-12

mark.

1

c.

Checking Transmitter.

( 1) Disconnect the antenna.

(2)

Set cont

(3)

Set control knob 4

rol

knob

12

position. (

4)

Insert a

crys

tal holder

is

concerned only with

can

be

obtained from the

about

10

feet

long, strung

or

50

foot

antenna

is

adequate

of antenna installation

can

be

dismantled quickly,

SET

FOR

USE

.

described

in

paragraph

33

follows:

knob

A (rectifier

ect

input volt

a,ge

tap

as

CH control knob 5

VOL.

position.

unit

ON

OFF switch control

ON

pos

ition.

CH control knob A

tap,

the meter read.

1 ,000

volts.

to

run

through a warm-up

s.

to

the REC.

position.

the CW. position.

to th

e 2-5

MC.

mark.

the

clockwise

direction

(atmospheric and man.made

set.

1 until signals are h

ea

is tuned to a continuou

In the event the r

ece

transmitter, a continuous

be

heard. In the latter

that its arrow points to the

eterody

ne whistle should dis.

reception

to

tl1

to

either the CW or PHONE

in

of the amplitude.

(5)

with control knob

e SEND position.

the

crysta

l holder

is

se.

above,

indi.

so

that

rd. J n

s-wave

iver

is

case,

MC.

socket

14

provided on the front panel

RT

-30(

)/PRC-1.

NOTE:

The

tr~nsmitt

mental crystal fr('quency a 2.3-mc crystal were used, erated

at

either 2.3 me

(

5)

Set control knob 5 to the OSC. PLT. CUR- posi-

tion.

(

6)

Set control knob 9 to either the

MC. point

in

cr

is operated at either

or

•

accordance with frequency of the crystal

of

Receiver-Transmitter

its second h:wnonic.

the

transmitter could be op-

or

4.6 me.

2-5

the

f~tnda

Th~ts,

Me.

or

if

5-12

selected.

(7)

Adjust control knob 6

points to a calibration point close to the

so

that its indicator line

frequel!lcy

of

the selected crystal or its second harmonic.

8)

With

(

the key depressed, rotate control knob 6

quickly in both the clockwise and counterclockwise di-

of

rection over a few degrees dip

of

the meter pointer

that the crystal-controlled oscillator

the arc until a pronounced

is

observed. This indicates

is

operating.

(9) Set control knob 5 to the AMP. PLT. CUR. posi-

tion.

(10)

Adjust contro l knob 8 to a calibration point close

:sec

to the frequency of the selected crystal or its

ond

harmonic.

(11)

With

the key depressed, quickly rotate control

knob 8 in both the clockwise and counterclockwise di-

of

rection over a few degrees

the arc to the point where

the meter pointer indicates minimum plate-current drain.

12)

Hold

(

bottom contact touches the

post marked

a neon lamp by its glass

metal part of the binding

ANT.

If

the transmitter

rectly, the neon bulb will glow showing an

CAUTION:

Do

not attempt any

bulb so that its

is

operating cor-

orange color.

chc.'Ck

on the

transmitter while located in a hostile area unless

it

you

closed.

work

are

on

Ac-

you have tried without success to make during actual operations. Remember

the

air

whenever the transmitter key complish any in

the shortest possible time.

11ecessary

checking

is

of

the transmitter

38.

USE

OF THE RECE

IVER

.

Under normal conditions, the receiver will render its

best performance with the set adjusted

tion (control knob 4 in the

a.

Adjust the VOLUME

c-w

position).

CONTROL

for

knob 3

c-w

recep-

in

clodrwise direction until a rushing noise is heard in the

headset.

b. Tune the receiver

ING

control knob 1 is turned rapidly, the desired station

may

easily be passed over.

SLOWLY.

If

the REC. TIJN-

c. Tune the receiver over the band with the left hand.

Keep the right hand on the volume control knob, ad-

of

justing the volume and hence the sensitivity

the re-

ceiver to an optimum level.

d. K

eep the headset on the

receiver e

e.

ar pieces

fitted into the ears.

Having located the desired station, reduce

hea

d w ith the

rubb

or

er

in-

crease the volume to a level that provides the best intelligibility.

f.

If

the desired station is transmitting speech-modu-

lated or tone-modulated

sign~ls,

phone reception (control knob 4 on

If

the desired station is transmitting·

control knob 4 on the

g.

Always search for the desired station with the set

adjusted for

h.

c-w

In

the event that the station received ts bemg

CW.

reception. . .

jammed either through accident or intentional

sign,

it

is

sometimes possible, through careful

lation

of

the receiver tuning, to attenuate the

adjust the set

PHON~

position.

c-w

stgnals, leave

for

tele-

position).

enemy_

de-

_mam~u

Jailll~tng

signals sufficiently to permit the intelligence trans.llllttecf

by the desired station to be copied. . . .

i.

Copying signals through bad

that can be accomplished by concentrating attenbon

atmo~phencs

~~a

trtck

e_n-

tirely on the signals. Since the signals have a de.fimte

pitch, try to

t1111e

the hearing to hear only sounds

of

_the

signal pitch. In this connection, observe that the pttch

of

c-w

signals can be varied over a

n~rrow

range

through detuning the receiver very slightly from resonance.

a

37

. OPERATION.

Having

in paragraph 36, tual operation the transmitter is

be reduced to

prepared the equipment for use

it

can now be put into operation.

of

the receiver is simple; operation of

a trifle more complicated, but

a series

of

integrated steps provided the

as

outlined

it

Ac-

can

instructions given in this manual are carefully fol!lowed. Memorize each ment a number ditions. Learn maxunum performance be obtained and the chances of being detected will

part

of

the operation. Use the equip-

of

times under simulated service con.

how and

tuhy

the equipment works; the

of

which the set is capable will

be

reduced.

39.

PREC

AUTIONS

IN

OPERATION OF

RECEIVER

a . Tune slowly. b. Keep the volume adjusted to

level without having the signals audtble except

th_e

highest

p~ssible

10

headset.

c. Always search for the desired station with the set

c-w

adjusted for

d.

Do

not try to receive c-w signals with the set ad -

justed

for

e.

Do

not

se

nd

position.

reception.

phone reception.

try

to receive with control

knob

12

.

the

in the

15

Pig11re

11.

Rece

iving

sccJio11

of

from

prmol

of

Receive

Transmillcr

40. RECEIVER

If

the frequency indicated

not correspond

bein~

received,

Lo

the

manner described

CALIBRATION.

the

known

receiver

below

R'J:-30()/PRC

on

the

- l.

receiver

frequency of the station

dial

can

be

_corr~·e~

so

that the dtal wtll mdtcate

the correct frequency. The following calibration

may

also

be

used

if

the receiver

is

to

be

tuned station and left in that position, provided a the transmitted frequency rection

of

this

type The receiver part of Receiver-Transmitter PRC-1 age

is

calibrated against a radio-frequency (:r-f) volt-

of known frequency generated

is available. A

is

known

as

receiver

by

che~

RT-30(

the

r·

dial

does

in_

method

to

one

c:rystal

or

~or

caltbratton.

crystal-~on

trolled oscillator in the transmitter. When the recetver

is

set for the reception of the receiver frequency

the set for ceed

is

adjusted to a zero-beat condition with the

of the transmitter oscillator. Having prepared

use

in

with the calibration of the receiver in the· follow-

c-w

accordance

signals,

the

freg

with paragraph

~

uency

36,

pro-

ing manner:

a. Insert a

frequen

b.

Set

c.

Set

d.

Set MET

PLT.

CUR

e. Adjust control knob

the

band

check

is

f. Adjust control knob 9

band

covering the frequency at

check

is

g.

D

6 for minimum plate-current drain

meter.

crysta

l in the

cy

at which the calibration

cont

rol knob 4 to the

control knob

ER

SWITCH control knob 5 to

.

pos

ition. .

12

crystal

to the

2

so

covering the frequency at

to

be

made.

so

that i

to

be

made.

epress

the transmitter

This condition will

key

be

holder socket

check

CAL.

position.

REC.

position.

is

to

be

tihe

of made.

OSC.

that its arrow P?tnts.

which

the caltbratJon

ts

arrow

poinl~s

to

which

the caltbratton

and adjust control knob

as

indicated

manifested

by

by.

a shght

the

~he

the

dip

in

the

meter

pointer

is

oscillating.

Rotate

iver

the

frequency

slowly

of the

control

is

just audible.

with

the

REC.

frequency

h.

the r

ece

the

receiver

i.

Rotate dicates the

knob

vicinity

pitched whistle will

which

will

rise

and fall and then

is

slowly

turned. The point

peaks

is

zero beat.

dial should indicate the

inserted

crystal.

incorrect, the hairline

screw

adjusting

just

the dial opening

bration

the

frequency.

CA

UTI

ON:

Do

in

a hostile

area Calibration of the transmitter with the by

enemy

direction finding units.

of

4

1.

USE

OF THE

the

)/

art. Detection down mitted

Remember

key

tune-up

that the transmitter

is

closed.

can

process

quickly.

Meaningless

during adjustment attracts

of

lar transmission. A great deal of time can

and

will

indicat

e that the crystal

knob

3 until the background

Do

not attempt

lhc

volume

control turned full on.

TIJNING knob 1until the dial

of the inserted

so

that the dial calibration

of the inserted

be

observed,

At this position the

frequency

If

the dial

must

be

to

the right of the lower edge of

so

that it

is

not attempt

unless it

receiver

conseque

TRANS

M ITTER.

Direction finding

be

avoided

is limited, and

more

crystal.

crystal,

the

rise

again

midway

between the

REC.

as

stamped

cal

ibration

adjusted

in

line with the dial cali-

lo

calibrate the receiver

is

absolutely

involves

is

by

the

nt risk of detection

is

011 tbe

is

a highly

successfully

messages

keying

of the transmitter

attention than a

through preadjustment of the controls to an approximate position

determined

by

past

experience

as

to

Pig11rc

12.

Tr,msmiller

'fr.m

<miua

sectio11

R"f

of

J(l(

/ro111

)IPRC

panel

I

noise

to

calibrate

By

rotating

is

in the

a high-

frequency

as

the

TUNING

on

found to

means

of the

necessary.

use

of the

air

whenever

developed

if

the

are trans-

be

saved

and

observa

of

ReceiviT

in

in-

of

knob

two

the

be

key-

regu-

-

16

•

tion. Before taking this set out on its mission, use it

of

a number phasis cannot be placed upon the need for fanoiliariza. tion with its operation before tactical tual antenna installations in several locations; operate the equipment under the conditions to be expected in service use.

lowing tune-up data sible, memorize it.

Crystal /rcqtl(mcy

Put the transmitter on the air following the procedure given below:

a.

Select a crystal of the desired operating frequency

or

Y:z

the desired operating frequency (fundamental or harmonic operation). Insert the crystal in the crystal holder socket provided on the front panel of Receiver. Transmitter

b. Turn the

position.

c.

Set control knob 4 to the CW. or PI

d. Turn control knob

sired

operating frequency.

e.

Set the METER

AMP.

GRID

times on practice tests. Too much em.

use.

Prepare a transmitter Jog so that the fol-

is

immediately available.

TR

ANSMITTER

a.

fundamental

b. harmonic a.

fundamental

b. harmonic

a.

fundamental

b. harmonic a. fundamental

b. harmonic

a.

f undamcntal

b. harmonic

a. fundamental

b. harmonic

RT-30(

)/PRC-1.

SEND

REC. control knob 12 to

LOG

Approximate dial settings

OSC.

TUNING

AMP.

lONE

9 to the band covering the de.

SWITCH

CUR. position.

control knob

Practice ac.

If

TUNING

the

SEND

position.

~>

to the

f. Depress the transmitter key and rotate control knob

!'i

for maximum grid current as indicated by the meter.

At

this point

the dial calibration.

it

should correspond rather closely with

g.

Set the METER

AMP. PLT. CUR. position.

h. Depress the transmitter key and rotate control knob

8 for minimum plate current drain as indicated by the

meter.

i.

With

the transmitter key depressed

knob

10 adjusted so that its arrow points to No. 1

pos.

the calibrated scale, rotate control knob 11 clockwise from zero position. of

control knob 11 the plate current drawn by the transmitter power-amplifier tube should increase to proximately 75 dicate such a plate-current increase, return knob 11 to 0 and adjust control knob 10 so that its arrow points to

of

No. 2 clockwise again. crease in the plate-current drain, continue the 3,

4,

5,

and 6

knob 11.

proximately current. Repeat these adjustments until the plate current been rotated too far clockwise, the minimum plate cur. rent will begin to decrease that two factors are involved in respect to the antenna tuning process: operating frequency and physical length

of

the antenna. quency, the greater will be the amount needed to load the antenna (control knob either the 1, 2, or 3 position). erly loaded, the plate-current reading should be ap. proximately 75 to

more than properly matched to the output circuit mitter. A mismatch will cause a pronounced decrease in efficiency and may damage the transmitter power out. put tube.

antenna will vary with each installation, adjustment

control knobs 10 the extent that past experience and the probable characteristics

rna.

the calibrated scale, then rotate control knob

tuning process, progressively utilizing taps

of

When

75

ma, retune knob 8 for minimum plate

is

at least 75 to 100

In

100 ma.

Since

SWITCH

At

some point during the rotation

If

the meter reading does not

If

the meter does

knob 10 in connection with the control

plate current has increased to ap.

as

general, the lower the operating fre.

100 ma.

If

it

is probable that the length

and

11

can be approximated only to

control knob 5 to the

not

it

will

rna.

knob 8

The does, the antenna

of

is

retuned.

With

the antenna prop.

meter must

ability

the antenna will allow.

A keying monitor system is provided so that an audio

tone will be heard in the headset when the transmitter

is

depressed provided control knob 4 is adjusted to

key either the

TEMPT

4

IN

42.

a.

the transmitter does not blink the lights rooms and throughout the house

CW. or

TO

THE

CAL.

SUMMARY

Be careful, when sending after dark, that keying

PHONE

position. DO

TRANSMIT JlfiTH CONTROL KNOB

POSITION.

OF

INSTRUCTION

S.

or

building.

and

with control

indicate an in.

be

necessary to

minimum

If

knob 10 has

Noti

of

inductance

10 adjusted to

not

read

is

not

of

the

trans.

of

the

in

judging

NOT AT-

in

adjoining

This

may

of

ap-

in.

ll

ce

of

17

lead

to

detection

blinking

suspend operation until everyone has gone to bed and the building is dark. is

power service. Remember, lights blinking

ing that radio transmission

in

is

the result

will suggest to enemy agents

b.

Do

not

the CAL. position.

Do

not

c.

of

the

equipment.

noticed after a few tentative dashes

This

blinking cannot be cured and

of

a poorly-wired building

is

taking place.

attempt to transmit with control switch 4

attempt to transmit with control switch 12

If

serious light-

or

inadequate

in

a build -

or

enemy personnel

or

dots,

in

the REC. position.

d. Handle the crystals carefully. e.

Make certain that

ANT.

TUNING

limum matching

of

f. Adjust the contact arm

clearance between contacts attendant to keying the transmitter will be much louder

and might result sonnel to your activities.

of

the key are too far apart the clicking

ANT.

SWITCH

knob

11

have been adjusted for op-

the transmitter to the antenna.

of

the key for minimum

knob

it and the other key contact.

in

calling the attention

of

10

and

If

the

noise

enemy per-

18

SECTION Ill

FUNCTIONING OF

43.

RECE

IVER

.

The

receiver uses five lubes, two

in

double-purpose type,

20),

designed for the reception signals (speech within the frequency frequency range (low-frequency band 2

5

to

12

me) suitable positioning hy a control knob located on the front panel

ceiver.

i~

of gear system by a control knob located on the front panel

of through the circuit which means the fier uses two permeability-tuned

Tuning

accomplished through capacitance variation by means

a three.section ganged capacitor driven through a

the receiver. Reception

of

a control knob located on

receiver.

or

is

either

of

in

corporation

is switd1ed into or out

The

a superheterodyne circuit (fig.

tone-modulation) and

range

of

covered in two overlapping bands

to

5.

25

of

which

is

of

a rotary selector switch actuated

the receiver to any desired frequency

of

c.w signals

of

intermediate-frequency

of

which are

of

amplitude-modulated

2 to 12 megacycles.

me, l1igh-frequency band brought into use through

is

accomplished

a beat-frequency oscillator

of

operation

the

front panel

(i.f)

i.f

transformers

c-w

of

signals

The

the re-

by of

ampli.

PARTS

i.f

resonated to the 455-kc,

the

design

attainment selectivity, simplicity undesirable characteristics (image respons tion).

44.

suitable adjustment up antenna coil

18 (high-frequency band) which together with capacitor

Cl7A

fier Tube tively connected in the circuit through the action

receiver band switch trimm high-frequency the

cuits

of

the receiver has been planned to assure

of

high performance reception (sensitivity,

of

R-F

AMPLIFIER

With

switch SW3

by

the

antenna

17

constitute the

JAN-6SG7(V

er

capacitors used

end

r-f amplifier stage will track with

of

the receiver. C1 7 A, which

STAGE

in

of

control knob 12,

is

transferred inductively from the

to coils

input

SW7. C15 and

of

each

channel frequency.

control) and the absence

.

the RECEIVE position through

the

16

(low-frequency

grid circuit

3).

Coils

to

align the

of

16

Cl6

input

the

two bands

is

of and

the

one section

The

the

e,

drift. radia.

signal picked

band)

the r-f ampli.

18

are adjustable

circuit

other

and

are selec.

of

the

at

the

so

that

r.f

cir.

of

the

of

LJ

RECEIVER

r--

R.F:

AMP

-

MIXER

osc

,_.._

I.

F.

AMP

r--

OET

1--

AUDIO

AMP

:)

I

B

FO

./

TRANSMITTER

..__

1--

CRYSTAL

osc

diagrmll

of

Radio

Set

POWER

SUPPLY

TL

AN/PRC

c

15633

- 1 ( ) .

19

R.F.

AMP

Pig11rc 13. Blork

three-gang tuning capacitors,

the REC. circuit which signal

its corresponding plate-current change is coupled into either band), Bias for tube V3 current through resistor R 16 and the variable tiometer control knob means applied to tubes sensitivity needs. quirement for V3 when R14 connection with the screen-grid circuit C19A functions plate V3 and V5.

45.

TUNING

is

resonated to the frequency

is

impressed upon

is

amplified in the tube

19

(high-frequency

depending upon the position

Rl7. Rl7

of

controlling the magnitude of the grid bias

of

Rl3

and R15 serve

of

V3. C19B bypasses the screen-grid circuits of

CONVERTER

control knob so that the input grid

is

obtained through the

is

adjusted by means

3.

The

function

V3

and V5, and therefore to adjust the

the receiver to correspond to prevailing

serves to provide the minimum bias re-

as

a bypass capacitor to ground for the

STAGE.

a. Mixer. Since tuned impedance coupling

r.f

between the

19

(high-frequency) and tively connected together with capacitor C17B serve of

the mixer stage.

grid

of

tube

R18 serves plate current Bowing in tube V 4 is a complex function of

the signal voltage and the voltage derived from the

local oscillator.

b.

Oscillator.

the cathode, oscillator grid, and screen grid plus the frequency-determining constants grid

tank circuit.

prised

of frequency) selectively connected SW7 together with C17C. trimmer capacitors used to align the oscillator at the high-frequency end bands. Coils frequency) are connected in the cathode circuit of tube V 4

so

that the cathode, oscillator grid and screen grid

V4

function

age

of

the oscillator frequen the capacitance variation tronically with the signal voltage. quency,

of the first i.f transformer

or

amplifier stage and the mixer stage, coils

in

the

The

V4

(JAN

as

a grid bias resistor

The

local oscillator is comprised

The

coil

113

(high-frequency) and

111

(high-frequency) or

as

an electron-coupled oscillator. The volt-

i.E

( 455 kc)

is

adjusted by means

of

the desired signal,

the

grid

of

tube V3.

in

the normal fashion and

band)

or

110

(low-frequency

of

switch SW7.

Bow

of

R17

is

to provide a

the

cathode current

a voltage divider network in

LlO

(low-frequency), selec-

circuit through switch SW7,

as

signal is impressed upon the

6SA7) through capacitor C22.

for

oscillator tank circuit

is

of

V3 and V5.

the input circuit

the tube.

of

the oscillator

114

in

the circuit throu

C24

and C25 are adjustable

grid circuit

of

each

of

112

cy,

as

determined through

of

C17C, is combined elec-

The

difference fre.

is

coupled to the primary

T!.

(26

and

(27

The

of cathode

poten-

VOLUME

minimum.

is

used

The

of

tube V 4

is

com-

(low-

gh

of

the

the two

(low-

of

115

are the

of

padding capacitors used in the grid tank circuit oscillator to maintain a constant frequency differential between the oscillator voltage and the signal voltage,

ive

of

irrespect circuit by

46.

1-F

The

signal, after having been frequency ( 455 the first fixed

ceramic capacitor. However, resonance,

determined and adjusted over a narrow range by means

of

a core

is

adjusted, with respect to

The

rod. 116,

the secondary lady shunted condition narrow range by means coaxial position 116,

by a threaded rod. tween the where

it

sultant plate current

i

second

through the

.f

connection

amp

lifi

er

47.

SECOND

The

signal is coupled inductively from

whi

d1

is former trol

(JAN-6SL7)

as

serves as the plate-load resistor for the detector tube

and

48. A-F

_grid

R28 ser bias through the flow

V7 functions as a class A audio ampldier audio component fashion. the output transformer

connected for use with a high-impedance headset, serv

as the plate load

capacitively coupled to the plate circuit.

ceiver is connected for usc with a low-impedance head-

T2.

grid

a grid-leak detector in connection with R24. R27

C38 serves

The

audio component

of

tube V7 (JAN

ves

the amount

Cl7C.

AMPLIFIER

kc),

i.f

transformer

of

powered icon, the toaxial position of which

signal is transferred inductively from L

of

by

a fixed ceramic capacitor.

of

116

is determined and adjusted over a

of

which,

grid

and cathode

is

amplified in the normal fashion.

transformer T2.

flow

of cathode current through R23 in

with

the

resistor

stage.

DETECTOR

the secondary

The

signal is impressed between the con.

and cathode

through capacitor C34. V6A functions

as

an

AMPLIFIER

as

the

grid

of

the signal

The

plate

of

tube V7,

of

capacity inserted

STAGE.

~onverted

is

coupled to

Tl.

115

transformer

of

a core

is

The

is

coupled to primary

The

STAGE.

of

the permeability-tuned trans-

of

V6A one-half

r-f

bypass capacitor to ground.

STAGE

of

the signal

-6]5)

return for V7 whtch recetves tts

of

cathode

V7

is

T4

which, when the recetv

115,

the primary

Coil

115

is

by means

Tl,

which

of

powered icon, the

adjusted with respect to

signal is impressed be-

of

tube V5

bias for V5 is obtained

network

(JAN-6SK7)

utilized in the r.f

.

is

coupled to the

through

is

amplified in

coupled to the

and

~39

curr~nt

t~roug~

the headphones are

When

of

the

in

the

to a new

of

shunted by a

of

11 5

is

of

a threaded

15

to

is

simi.

The

resonant

The

re-

117

of

the

117

to

118

of

tube V6

an~

R~9.

R30.

10

whtch the

th~

normal

prun~ry

~f

er

JS

es

the re.

20

set, the audio output output transformer neath the receiver chassis.

49.

BEAT-FREQUENCY OSCILLATOR.

Tube V6B, one-half of tube transformer The are permeability tuned L19, shunted C35. R25, in connection with C36, functions grid leak bias source for tube V6B. low-impedance bleeder resistor to limit the amplitude

generated

voltage generated

coup led to the capacities

50.

TRANSMITTER.

The

lator

coupled capacitively to a class C power amplifier.

a.

plate type, with the crystal connected between the grid of

tube

capacitance capacitors through the action lower than that slight amount the harmonic operation a grid leak bias resistor. pedance path to ground for the heater circuit of

The

frequency-determining constants

are: the crystal, and variable capacitor

connected

band) and L2 (low.frequency band) through the ac.

of

tion

for the screen grid impedance path to the cathode for the screen grid.

b.

The tank circuit The

output is only slightly decreased when the plate tank circuit is tuned to the second harmonic crystal frequency. Because the circuit affords (isolation between the crystal and output circuit), the oscil!ator is stable and is ceptile to changes in tuning. Provision is selective insertion determine visually the magnitude by

Vl.

voltage since the capacitor provides a low-impedance r.f

T3,

frequency determining constants

r-f

by

the beat-frequency osciltator.

of

tube V6A and

transmitter consists

of

the regenerative type, the output

The

crystal-controlled oscillator stage is of the grid.

Vl

(JAN-6V6)

(L-C)

C2

and

of

in

parallel with coil

SWl.

R3 serves as a voltage-dropping resistor

oscillator supplies high output when the plate

is

resonated to the frequency

C4B is used to protect the meter against r.f

is

laken from the secondary

T4.

These connections are under.

V6

(JAN-6SL7),

functions

bypass to ground. R26

by

i.f

combination comprised

C3, selective

of

positive feedback and thus improve

of

as

a beat-frequency oscillator.

of

the oscillator

by

.fixed

ca.pacitor

C37 functions

serv·es

of

the

r.f

-voltage

The

the beat-frequency oscillator is

system through the interei<ectrode

B.

of

a crystal.controlled oscil.

of

which

and ground.

ly

SWI,

is

tuned to a frequency much

the crystal in order to introduce a

of

the oscillator.

Cl

provides a low

of

Vl.

of

the buffer action which

a meter

in

shunt with R4

The

indu.ctance.

of

RFCl

connected in the· circuit

Rl

serves

tr-f

of

the oscillator

C6

sel•~ctively

Ll

(high.fre.quency

C5

provides a low.

any

r.f potemtial on

of

the crystal.

of

not

made for

s:o

as

of

plate current drawn

of

with

as

as a

r.f

is

and

as

im.

Vl.

the

sus.

to

path to ground. R2 serves to provide minimum bias

for tube

51.

oscillator

tube V2 ates action

a

by

a

quency.determining constants coils L3 and

variable capacitor ClO through the action vision delivered to the grid of connected through the action impedance

tection to the meter. C9A, B, heater, cathode, and screen grid bypass capacitors to ground.

Vl

in its non-oscillating state.

POWER AMPLIFIER STAGE.

a.

The

r.f

voltage generated

is

impressed between the grid and cathode

(JAN

807)

through capacitor C7. V2 opec.

as

a class C amplifier, biased through the grid leak

of

R5

together with the bias voltage developed

the passage

is

a shunt resistor R6 to which the meter

of

cathode current through R

L4

selectively connected in parallel with

made for metering the magnitude

of

r-f

path to ground and thus provides pro.

by

the crystal-controlled

7.

of

the power amplifier are

of

SWl.

of

V2 through the incorporation

is

of

SW5.

CS

offers a low.

and

C are respectively

b. RFC2, wound on a shunt resistor, is a parasitic sup.

pressor included in the plate circuit high-frequency parasitic oscillation tier. Provision nitude nitude incorporation multiplier resistor R9, to which the meter is selectively

connected through the action generated

normal fashion the antenna-loading system comprised

ductor and

(12 the antenna used with the transmitter. porated in the antenna circuit so ure

of cumulating on the antenna with the consequent possible damage to the receiver antenna coil L7.

c.

The

both the oscillator and power amplifier keying relay which connects the negative side high-voltage supply to both stages when the is

depressed.

52.

POWER

The

power supply is used to provide a source

.tied,

filtered, a.c voltage for the plate, screen,

needs

of a.c voltage to heat the filaments and transmitter and energize the keying relay.

is

made for determining visually the mag.

of

the plate current drawn

of

plate voltage delivered to V2 through the

of

a meter shunt resistor R8 and a meter

of

by

the crystal oscillator is amplified

by

V2, and is coupled through

L5

and variable capacitor C12. Together, L5

provide an electrical means for lengthening

protection against charges

transmitter

SUPPLY

the receiver and transmitter.

of

is

keyed in the cathode circuit of

.

the proper magnitude and current rating

of

the tubes used in the receiver

of

V2 to prevent

of

the power ampli.

by

V2 and the mag.

SW5.

The

of

Rll

as

to provide ~ .meas.

of

static electnoty ac.

by

means

It

also supplies

of

The

fre.

Pro.

excitation

selectively

r-f

voltage

in

the

Cll

to

tapped in.

is

incor.

of

the

of

the

key

in

Jl

of

recti.

and

bias

21

a.

The

power supply is comprised

VS

former T5, rectifier tube

ciated circuit elements connected as a full-wave rectifier.

b.

The

primary

ous

line

input

SW9.

c.

The

filter circuit

and

C44

connected brute force filter. R31 and R32 function divider network

quirements

resistor. R36 functions as a voltage-divider resistor in

connection with the B voltage requirements

mitter crystal oscillator. R37 functions divider resistor in connection with the screen-g:rid voltage requirements

of

T5

voltages through suitable positioning

as

in

connection with the B voltage

of

the

receiver. R33 functions as a bleeder

of

the transmitter oscillator.

(JAN-5R4GY)

is

tapped for operation on vari-

is

comprised

a capacitor input, two-section,

of

a power trans.

and

of

C42, CH, C43,

as

a voltage-

of

the trans-

as

a voltage-

asso-

d. R34 and R35 together with the two-se.ction se-

lenium oxide rectifier function connected directly to

of

The

SW5.

S.

line voltage. determined visually by means

selectively connected to the meter rectifier circuit through

the action

53.

SWITCHE

The

following are the functions

in

the

re~eiver,

the

magnitude

transmitter, and power supply.

a. SWl, Transmitter

to adjust the transmitter for operation on the two frequency bands covered. in the high-frequency position, coils

to

connected

the

in

IA

are connected to their associated circuits.

b. SW2,

in

used

their associated circuits.

low-frequency position, capacitor C3, coils

ANT. SWITCH.

connection with

coil 15.

as

a half-wave rectifier

a-c

line

for measuring the

of

the rectified voltage

of

the meter which

of

the various switches

BAND SWITCH.

With

L1

With

SW2

is a rotary

With

the switch selec-

SW'l serves

eithe1r

one

the

switch

and

13

the

switch

12

tap

switch

are

and

tively connected to

of

amount

c.

the SEND REC. switch, the antenna, power-amplifier screen-grid circuit, and keying monitor circuits are

of

nected when the switch

in

the REC. position, these circuits are broken and the

receiver

voltage supply.

re-

is is

d.

in

the CAL. position, the keying monitor circuit and the screen-grid circuit are broken and the receiver beat-frequency oscillator

(BFO)

is

in operative condition and the screen-grid circuit

• transmitter power amplifier switch rendered inoperative and the screen-grid circuit transmitter power amplifier

e.

swit~h

and the transmitter panel light.

inductance

SW3,

SEND

is

connected to the antenna and to its plate-

SW4,

CAL.

is

put

the

CW.

is

in the

SW6, LIGHTS

in connection with both the receiver dial light

f. SW7, Receiver

adjust the receiver for operation on either one two frequency bands covered. high-frequency band position, coils

113

are connected to their associated circuits.

switch

in

the low-frequency position, coils

of

and

114

are connected to their associated circuits.

g.

SW8

, Power Supply

serves to connect the primary

of

source

connected to the various taps provided on the primary of input line voltages.

power.

h. SW9,

transformer T5 to adapt it for operation on various

LINE SWITCH

one

of

the taps, a corresponding

is

placed in series with the antenna.

REC

. Switch. Through the action

is

in the SEND position.

CW

PHONE

of

the

:n its operative condition.

position the receiver BFO

PHONE

.

BAND

Switch.

transmitter power amplifier

is

completed.

position,

is

SW6

SWITCH

the

completed.

serves

as

. SW7 serves to

\'<lith the switch in the

18,

OFF

ON

of

transformer

.

SW9

is

a rotary

con-

When

SW4

When

SW4

is

put

in

of

the

When

BFO circuit is

an

19,

16,

Switch.

ON

111,

With

110,

T5

tap

the

of

the

OFF

of

the

and

the

112,

SW8

to its

switch

of

is

its

22

NO

W.

TE: Uns

0.,

A. G.

SECTION IV

MAINTENANCE

ati

sfa

ctory performanoce of this equipment will

0.

Form No. 4

68.

If

Form No. 4

68

Is

not

be reported

available,

immediately

see

TM

on

38-250.

54. GENERAL.

Adjustment, repairs, or ment should not to service

and suitab the equipment test

equipment for the mainte

this

le

be

type

test

equipment must

can

be

attempted

of equipment. Trained personnel

disassembly

by

tested

for major faults. Adequate

nan

ce

of

personnel not trained

be

available before

and repair

the:

of

equip-

Rad

Set AN/PRC-1 ( ) should include the following items:

a. An r.f standard

b. An a.f output

c. A universal

and d.c voltages, resistance

values

d. A 300-ohm

55 .

OPERATION~l

a. Check the mounting of all

nuts, bolts, and

soldered joint and wiring.

Clean the equipment thoroughly and

sion.

signal

meter.

ana1yzer

necessary

of

all

resistors.

dummy

INSPECTION

screws

generator.

capable of indicating all

direct-current

antenna, transmi!ling

components.

values,

and the

type.

.

Inspect all

for tightness. Inspect all

Remove

all

traces

of

toud1

corro.

scratched paint.

b. Inspect all plugs and

plug contacts

are

clean tight. Check headset and cord, the power-cord plug, and the adapter plugs

knobs.

and that

key

cords.

Make

knob

Check

sure that

setsc1rews

the power

fur-

nished with the equipment.

c. Check the antenna wire

points, and at the antenna

d. Make sure that a

seated

e.

stations

signals and noise-level oscillator and

cl1eck

post.

in their

respective

Operate the

in

ead1

check

in

the

check

the connection of the

ll

receiver equ

band.

the

receiver

for the beat note against the in.

tubes

Select

receiver

for

breaks

and

antem'na

and the

crystal are

sockets.

ipment. Tunc in different

stations providing

sensitivi

and turn

ty.

Check the

on

the beat-frequency

frayed

wire

properly

weak

coming signal.

f. Operate the transmitter equipment. Make the

proper tuning adjustments

while using various

crystals

and both bands. Hold the neon bulb against the an.

to

Check

the

REPLACEMENT

LAMPS

the sensitivity of

produce intermittent operation,

or

may

io

a.c

tenna post is

pressed.

g.

56

.

CATOR

a. Failure of a

reduce may

hum,

or operative. In tubes

in

use

ment

as

operating

located.

b.

Fa

ilure of

cause

reduced

milliameter,

d.c

In

up

mitter.

in

use

from

such

the

operating spares. until the defective lube is located.

all

arc

c. Failure of

wi

ll

cause

both

the

transmitter and the receiver. Substitute a good

tube

from

poor operation or complete inoperalion of

the operating spares supplied with the equip.

men!.

d. The primary fuse

mary

1

circuit of transformer

cause

of

some momentary overload, or line voltage or frequency. Determine and correct the

cause

of the burned-out

fuse

by

unscrewing the fuse-extractor post located near

OFF

the

ON operating spares back

in place

e.

To

repl

ace

c

over

from

the lamp

bulb. Replace it with a bulb

check

the antenna current when the

dial

and panel light bulbs and spares.

OF

TUBE

S,

FUSE

S,

AND

INDI

.

vacuum

cause

such

cases,

from the

spares,

~

vacuum

power output, improper reading

tube in the receiver

the

receiver

to receive

may

the

receiver

tubes

to

be

make

substitutions for the

supplied with the equip-

until the defective lube

tube

in

the transmitter

may

d signals,

cause

noise

completely in.

may

on or complete inoperation of the trans. cases,

make

substitutions for the tubes

tubes

supplied with the equipment

the:

rectifier

FS2

tube

in the power

will burn

T5

out

is

overloaded, either be.

:;uppl)•

when the pri-

defective tube or part in the equipment,

because

fuse.

of the

Repla

use

of an improper

ce

the defective

switch, and place a new fuse from the

in

the holder.

Screw

lbe"

fuse holder

firmly.

the

panel

light,

remov

e the black

base

and unscre\\ thc defcctivl

of

the same voltage and

metal

key

-

is

the

as

23

SIGNAL GENERATOR

OUTPUT

8

ATTENUATORQ

R.F.

GN

RECEIVER-

RT-30

REC

TRANSM

( ) I PRC-1

ITTER

POWER

SUPPLY

..

TO

A.

C.

LINE

Pigur6 14. Block diagram

of

Radi

o Sel

AN/PRC

OUTPUT

METER

...,

I

- 1

()

Jel-up for alignmell/ of ru

TLI~634

TO

A.C.LINE

ciur.

Figurt JJ.

Bouom

view

of

receiver-JraiiJtniller chassis, 1hotv

current rating from the operating spares. Replaoe the metal cover.

f.

To

replace the dial li

moved from the case. Loosen the six captive

ght

the chassis must

be

re-

sCtC'i>vS

in

24

i11g

/oraliO

II

the corners

of

the

front

panel. Slide the chassis out

the case a few inches and,

The

power plug. left

end

of

the chassis. Unscrew the defective bulb and

dial light is now accessible from the

of PartJ.

if

necessary, disengage the

of

Pig11r

e 16. Rear vieu'

of

receiller·lrfii/JIIIiller ch.usis, showing locntion

of

fJar/J.

replace rating re

57

AN

ment procedure should

an Place the output impedance position. Make certain the

(knob quency oscillator will not VOLUME control (knob 3) pos

the receiver

I

provided for both the primary and of screws

Sct the standard signal generator for

with a new

from

the operating

place chassi

.

RECEIVER

If

realignment of the

j PRC-1 ( ) beco

a.

General.

bulb of the

spa

s,

and tighten panel

ALIGNMENT.

receiv

mes

necessary,

be

All

adjustments should

same

voltage

res. Reconnect

screws.

er

section

of

the following align.

followed. Refer

be

output meter connected to the PHONE

switch

in

the low.impedance

CAL.

CW. PHONE

4)

is

in

the PHONE position,

be

in

the

so

operation.

maximum

the beat-fre-

ition.

b. 1-f Alignm ent . The intermediate

is

455

kilocycles.

Tuning adjustments

frequency

secondary

the i-f transformers TJ and T2. The adjusting

slide i

ron

cores

in

and out of the

coil

an output of

and

current

power

cord,

Radio

to

fig.

made

with

jack

switch

Place clockwise

windings

windings.

455

Set

14.

J2.

the

of

are

kilocycles

and connect its high-potential output lead the signal grid of the mixer tube (terminal 5 of V4) through a potenti

metal

400-ohm

al

output

part making direct connection

just the output voltage of the sig

indication of approximately 10 Refer

to

figure

Adjust

the

i.f

L18

Ll7, and indication

consecutive

in coil

is

of transformers

on

the output meter.

peaked properly. signal generator from adjustments, in order to tion at or near

c. Beat-frequency Oscillator Adjustment. The

beat-frequency oscillator should not

except

when

the set

rough treatment or possible after tube V 6

it

is

he

necessary

changed. T in

case

series

resistor. Connect the

lead

from

the signal generator

to

nal

volts

on

15

for loca

adjusting

tion of

screws

i-f

on

the i-f

Tl

and T2, for a

Repeat

order

several

time

ke

times

Readju

to

ep

the

time

to

st the output

output meter indica.

10 volts.

reguire adjustment

has

been

subjected to extremely

following procedure must

to

align the beat-frequency

to

the

chassis. Ad.

generator for

the output meter. adjustipg

coils

screws. L15, maximum

the adjustments

make certain

of

whi

le making the

has

be

followed

oscil

low

L16

each

been

to

.

any

an

,

the

-

25

L9,LIO

Lli,L12,LI3,Ll4

Figlfre

17.

End t'

iew

of

rer&iver·ll't/1/Jmillel;

lator. With the standard signal generator set for

output of 455

scribed in subparagraph

from the PHONE

meter phones. Refer

frequency oscillator adjusting core adjusting until the most pleasing note

is

ment 1,000

cycles

d.

High-freque ncy Oscillator Alignm ent.

kilocycles,

to

screw

figure

connect it

b

jack

15

to

the radio set

above.

Remove

and plug

for location of

screw.

in

Adjust the iron

on the oscillator transformer T3

is

obtained. (This adjust.

not critical. A beat.note frequency

is found

to

be satisfactory

in

most cases.)

the output

the head.

tlhe

of

an

as

de.

beat.

about

Re. alignment of the high-frequency oscillator circuits is se

ldom receiver, is

greatly

being

received.

lowed

necessary

as

in

adjusting the high-frequency oscillator trim.

unless the resonant frequency of the

indicated

error

by

with

the reading

respect

to

the

of

actual

the tuni

The following procedure must be fol.

1ng

dial,

fnequency

26

CI7B

cht~JJit,

thowiug loctllioll

mers.

All adjustments arc

sig~al

gener~tor

senes

capac hand corner of meter

co~necte~

for Joc

atJOn

fer to figure

( 1)

H-F

LOW

FOR

(a) Pl

ace

pos

ition, and set the

(b)

Set the signal generator output

connected

1tor)

the

as _described

of

osc11lator

16.

OSCILLATOR ALIGNMENT PROCEDURE

BAND.

BAND-SWITCH (knob 2)

(c) Adjust trimmer capacitor

of />ttrl!.

made

with the output of the

to

the ANT (through a 0.05

and GND

posts

in

the

upper right-

front panel, and with the output

in

subp.tragmph a

trimmer adjusting

receiver

tuning dial

C25

for

screws

in

the 2-5MC.

at

5.0

me.

at

5.0

me.

maximum out.

put.

(2) H-F

FOR

OSCILLATOR ALIGNMENT PROCEDURE

HIGH

BAND.

(a) Place BAND-SWITCH (knob 2) in the 5-12

I

above.

re-

MC. position, and set the

receiver

tuning di

al at

12.0

me.

(b)

Set the signal generator output at 12.0

(c)

Adjust trimmer capacitor C24 for

me.

maximum

put.

e.

R-f Amplifier Alignment. With the output

to

the

ANT

signal generator connected

of

the receiver, and with the output meter connected

and GND posts

of

above, align the r-f stage in accordance wah the following procedure. For

screws refer

( t ) R

(a)

2-5

the

5.0

me.

(b)

(c)

to

figure 16.

-F

ALIGNMENT FOR LOW BAND.

.Pla

ce

the receiver BAND-SWITCH (knob

MC. position,

Set the signal generator output at 5.0

Adjust trimmer capacitors maximum output. to make certain

(2)

R-F ALIGNMENT FOR HIGH BAND.

(a)

Pla

5-12

the at 12.0

me.

(b)

Set the signal generator output at 12.0

(r)

Adjust trimmer capacitors Cl5 and

each

ce

the receiver BAND-SWITCH (knob 2) in

MC.

position, and set the

maximum output. Repeat to

make certain

each

f. Precautions During Alignment.

that

the· input signa l

low

the point that will cause the receiving tubes

Maintain

an

output indication

!~cation

and

Repeat

coil

coi

l is properly peaked.

from

of

set the receiver tuning dial at

each

adjustment

is

properly peaked.

each

adjustment

signal generator

of

r-f trimmer adjusting

2)

me.

Cl6

and

C21

several

times

receiver

tuning dial

me.

C20

several

times

It

is

essential

be

kept to

block.

10 volts or

less.

Ex.

out-

the

for

be-

cessiv

e signal inputs will cause overload or amplifier circuits and must co

rrect alignment indi

58.

PROCEDURE

a. Systematic Checks . . Speed

in

equipment

has

as

( ailure, the trouble

a

few

been

is

wasted searching for the cause of equipment

minutes are n:quired

be

cati

ons.

IN

LOCATING TROUBLE.

essent·

ial.

Frequently, after much time

is

found to

to

avoided because

be

correct

of

in

locating trouble

so

minor that only

systematic procedure in eliminating possible causes trouble the transmitter

in

thorough-going continui symptom

cation.

in Make certain that the power

source of power, and that all co inspection, units. Daily inspection minimize failures due

in

when

failure

does

of

trouble

Check

the unit, since

occur.

chassis

from the

ty

is

a lack of voltage or current indi.

the power cord, jacks, switches, and

they

are the

check

common

It

of

cord

plugs· are makin? ?ood

ntact in their

sockets

close

or

jacks. After

ly examine the transmitter and receiver

of

the equipment will serve

to

minor faults, such

connecting cords and poor contacts.

b. Trouble Chart for

Ope

rator.

is useless to remove

case

and institute a

the circuits when the

sources

is

connected to the

such

The

below lists a number of typical troubles which

in

this equipment . In

case

of

equipment failure, c the items in the trouble chart before initiating a detailed examination. Note that some caused

by

fai

lure

to

adjust the equipment properly when

use.

setting it up for and

tune-up procedure before operating the equ•pment.

Always

of

these troubles

recheck the

the detector

of

in-

it.

Follow a

of

fuses

of

trouble.

preltmtnary

to

as

breaks

trouble

may

cl1art

occur

h.eck

are

inst~llation

-

Trouble

Receiver dead.

TROUBLE

Line

Probable

cord

not correctly inserted in the power

causes

source. Control knob B in OFF position.

Fuse

FS2

blown.

to

d-e

Equipment connected

Control knob 12 adjusted

power

to

SEND position. Phone plug not correctly inserted jack.

Defective or burned-out

tube.

Defective headset.

Jines.

in

PHONE

CHART

Remedy

Insert correctly, making certain that proper

is

3la)

made.

.

ON

position.

electrical contact Adjust

co

ntrol knob B to

Replace (par. DISCONNECT EQUIPMENT FROM THE

POWER LINES.

Adjust cont

Make

rol

ce

rtain that the

knob

12

Lo

the

PHONE

REC.

plug

position.

is

fully in. serted in the PHONE jack. Replace. Replace.

27

•

Trouble

Weak

receiver. Receiver

Probable

not

tuned properly.

Antenna not connected to antenna binding post.

Poor antenna installation. Defective headset.

or

Defective Misalignment

burned-out tube.

of

cau

receiver.

ses

Re

med

y

Reset dial. Sec paragraph 36b. Recalibration

-------

may

al

so be necessa

Make certain that the antenna wire is making

act wi

cont Improve antenna. See paragraph 34. Replace. Repl Align receiver.

th the antenna binding post.

ac

e tube.

ry.

See paragraph 40.

---

-

Transmitter dead. Line cord

Transmitter weak.

•

not

correctly inserted source. Control knob B Fu

se FS2 blown.

Equipment connected

Control knob

plug

Key

Defective Control knob 4 in the CAL. position.

Defective crystal. Fuse

FSl

Poor antenna installation.

Defe~tive

Mistuned.

Defective tube .

in

OFF

position.

to

d-e

12

adjusted to REC. position.

not

correctly inserted in the key jack

or

burned-out tube.

blown.

crystal.

in

power lines.

the power

Insert correctl electric

al

Adjust control knob B to

Re pl~ce

DISCONNECT POWER Adjust Make' certain that the key plug

in

the key jac

Replace.

Always transmit with control knob

the

CW

Replace.

Replace (par.

Improve antenna. See paragraph 34. Replac

e.

Retune. See paragraph 41.

Replace.

y, making ce

contact is made.

(par. 31a

LINES.

co

ntrol knob 12 to

or

). EQUIPMENT

k.

PHONE

3la).

position.

rtain

ON

position.

SEND

is

FROM

position. fully inserted

that

proper

THE

4 in either

28

Figure 18. Rear view

of

rectifie

r power

unit

showing /oration

of

parts.

. ·---,

FigNrr

19.

Boll

om t•ie

tv

of rectifier

/JOWI!r

uuit showiti

J!. locat

ion

of

part

J.

29

59.

VOLTAGE

The following chart shows

each

indicated tube-socket pin

m<:nts

on

the

cry~tal

1'ubc

VI,

(JAN

MEASUREMENTS

the

to

transmittin~

removed

6V6)

tubes

Vl

(no excitation) and the

Pin No.

3

.

voltages obtained

the

chassis.

and

V2

4

8

V

2,

(JAN

807) 2

4

cap

Vol

ume

control

fully

clockwise

V3,

(JAN

V.1,

(JAN

V5,

(JAN

V6,

(JAN 6SL7)

V7, (JAN

60.

POINT

6SG7)

6SA7)

6SK7)

6]5)

-TO-POINT

3 6

8

3

4

5 5

6

8

2 5 3

8

RESI

STANCE

2.5

85 250 250

60

150

5

70 100

220

45 45

250

8

MEASURE-

MENTS.

The following chart measured chassis.

from

Measurements are

shows

the average resistance values

each

indicated tube-socket pin

made

with

disconnected and the volume control fully

are

Voltage

200

180

10

550

40

BOO

the

power

clockwise.

from

Measure-

made

with

key

closed.

Volume

.

co

ntrol

fully

counter-

clockwise

40

150

300

290

75

150

35

300

45 45

250

8

to

the

cord

61.

SERVICING

WARNING:

THE

TRANSMITTER.

HIGH

VOLTAGE-USE

CAUTION

a.

Pla

ce

the

SEND

REC.

switch

b.

S<:c

that

th<:

dummy

l<:nna

is

c.

Turn on

correctly

the

con

nected.

power

and

operation.

d.

If

th<:

trnnsmitter

ceed

as

follows:

(l)

Place

th<:

METER

VOL.

position

of the

final

normal

(_2)

Plac<:

CUR:

position

ampiJfi<:r

resonance

the

minimum

dip

is

obtained, excitation

is

defect

(3)

Place GRID CUR. the

final than normal, the

tube

d-e

voltmeter

cathode resistor

NOTE:

ma,

the maximum grid current for this rube.

(If)

If

the

to

nrnplilier.

reading

th<:

METER

plate current. Tune the final amplifier

for

the

plate current

ivc.

the

METER SWITCH (knob

position and depress the

amplifier grit! current.

excitation

is

not properly

across

to

Mak<:

certain tho grid current never exceeds

final

plate current dip

(5)

If

grid current for

place

the

METER SWI position and depress the plate current the

oscillator

is

inoperative

SWITCH (knob

check the B voltage in the plate circuit

Compar<:

in

paragraph

SWITCH (knob

and

depress the

current dip

is

Jacking

from

biased.

the

grid resistor and

check

the

bias

amplifier grid current is

not

obtained, check the final amplifier.

the

T([ I in

the

key

to

is

higher than normal, 10

not functioning properly, and requires

in

the SEND position.

.111tcnna

check

or the regular

both

bands for proper

on

this

reading

59.

key,

noting the

with

knob

8,

not

over 100

or the

5)

key

Tf

grid current

the oscillator

Usc

a high-resistance

voltage.

is

final amplifier

the

OSC.

check

for

EXTREME

an-

both bands pro.

5)

in

the

PLT.

with

the

5)

in

the

PLT.

fina

to

making

final

certain

ma.

amplifier

If

no

•

in

the

AMP.

while noting

is

lower

is

Jacking,

across

normal but

is

PLT.

oscillation.

ma

30

lacking,

CUR.

or

more.

or

the

If

l

Vl, V2, V3, V4, V5, V6, V7,

30

Tube

(JAN (JAN (JAN (JAN (JAN (JAN (JAN

•M

tinf

6V6)

807) 6SG7) 6SA7) 6SK7) 6SL7) 6]5)

thousand.

infinity.

0

0.5 0 0 0 0 0 0

300M*

0

--

0.5

lOOM

56M

0

Tube·sock~t

2

3

50M 30M

300

2,500

0 0 l

47M

pin number

60M

inft 0

0.5

3,000

22

meg

inf

~nd

4

r~si,unc~

2,000

330M 5501\f

in

ohms

90M

300 3,500

330

---

60M

3.

inf

500

6

7

8

-

0

0.5

inf

2,500

1

meg

2,500

0

1,000

further investigation. properly the plate current will

(6)

When the defective stage ure the plate voltage from the to

ground. Compare this r<:adiitg (7)

shown in par.tgraph 59.

Measure the cathode voltage and compare these reading:; tages

in paragraph

(8)

If

a circuit

within

10

percent,

(9)

Replace defective components with exact duplicate

replacement parts when

wiring and parts should

stability

( 1

for

and power output.

0)

Repeat tuning

normal

opc.:r:1tion

If

the oscillator

be

has

B-:;ide

re.tdin,g

volta~c

is

functioning approximately 7 been localized,

of the load resistor

with the normal B

and the screen-grid

to

the normal vol-

59.

is

found not having normal voltage

check

the components of that circuit.

possible.

be

duplicated

process

Original placement of

to

maintain original

and ch

eck

the transmitter

on both bands, checking against the

rna.

meas-

specified standards for power output, freguency range, and

accuracy

e.

If

of calibration.

only one { reguency band

was

defective,

check

only the components of that band.

f.

If

operation of the transmitter both bands, make a complete and thorough check parts and wiring. made

to

recur by gently shaking or jarring the transmitter.

g. Dirt, moisture, and insects often

a transmitter. Make ccrt.tin

Many intermittent troubles can

the:

using a soft cloth or compressed air

Moisture cloth and then placing the an Ove

62·. MOISTUREPROOFING AND FUNGIPROOFING.

me humidity are

m.ty

be

removed

by

chassis in the sun or under

elecl ric heater until

it

is

thorou~h

rheat.

a.

General. The operation of Signal Corps equip·

nt

in

tropical areas where temperature and relative

extremely high requires special attention. The following items represent problems which encountered in ope

~

l)

Resistors, capacitors, coils, chokes, transformer wind-

togs,

etc., fail.

(2)

Electrolytic action takes place in resistors, coils,

chokes,

transformer windings, etc., causing eventual

rat

ion:

is

intermittent

cause

transmitter

to

remove

first

drying with a soft

ly

dried out. Do not

trouble

is

clean

the dirt.

may

of

all

be

break-down.

(3)

Hook-up wire and cable insulation break down.

Fungus growth

(

4)

Moisture

b

oards

and insulating strips, causing flash-overs and

accelerates deterioration.

forms

electrical leakage paths on terminal

crosstalk.

b. Treatment. A moistureprooling and fungi proofing

treatment has

been

devised which, if properly applied, provides a reasonable degree of protection against fungus growth, insects, corrosion,

salt spray, and moisture.

treatment involves the use of a moisture- and fungiresistant varnish applied with a spray gun

Refer

to

TB

SIG 13, Moistureproofing and Fungiproofing Signal Corps Equipment, for a detailed descripti

on

of the varnish-spray method of moistureproofing and

fungi

proofing.

CAUTION: Varnish spray

may

have toxic effects if

inhaled. To avoid inhaling the spray, use a

tor if

available,

other cloth over the

c.

Step-by-step Instructions for Treating Radio

Set

AN/PRC-11

( I ) PR

ments

( 2) D T

EP

necessary

SASSEMBL

(a) Open the

otherwise, fasten cheesecloth or some

nose

and mouth .

l.

ARATION. Make a

for proper

ll

repairs and adjust-

opera~ion

of the equipment.

Y.

case

and remove the contents

spare parts compartments.

on

chassis in the

(c)

be

transmitter the

in

by

(d)

from the equipment

(3)

(a) Wafer switches

chass

(b)

ch

ass

(c)

(d)

(e)

(f)

(g)

-(b)

Remove

case.

Clean

MASKING. Mask the following:

is.

Transmitter variable

is.

Rel

Contacts Ceram

Wafer switch

Variable capacitors Contacts of the microphone and phone jacks

the four

case

and remove the unit from the case.

the four

chassis

in

the

all

dirt,

dust, rust, fungus, oil, grease, etc.,

to

be

on

ay contacts

on

of the power pl

ic wafer capacitors

es

on

screws

holding the power unit

screws

case

holding tbe receiver-

and remove the unit from

processed.

top of the

rece

capacitor on

top of the chassi

ug

on top of the chassi

on

top of the ch

the bottom of the chassis.

on

the bottom of the chassis.

(b)

the bottom of the chassis.

(i)

Power unit wafer switch.

(j)

Power plug contacts

(4)

DRYING. Place the equipment in an oven under heat lamps and dry for 2 DO

NOT

EXCEED 160°.

(5)

VARN ISHING.

on

the power unit.

to

3 hours at 160°

(a) Apply three coats of Lacquer, Fungus-resistant

Spec.

No. 71-2202 (stock No. 6G1005 3) or eq 1 ·

a spray gun or a brush.

drying between

eac

h coat of lacquer.

Allow

15

· '

to

The

or

brush.

respira-

of

the

iver-transmitter

top

of

the

s.

assis.

on

or F.

ua,

wtt 1

m·

20

t f

tnu es

or

s.

'

1

)1

(b)

When

the lacquer has dried, remove the masking

tape and brush on lacquer to those portions not touched

the

spray.

by

(c)

Varnish the inside

or

spray for this operation.

(6)

REASSEMBLY.

of

the case, using either brush

(a) Remove all masking tape.

. (b) Clean all contacts with varnish remover and bur·

the contacts.

msh

(c) Reassemble the set and test its operation.

(J)

MARKING.

date of treatmenl.

Example: MFP- 8 June 1944.

Mark the set with "MFP"

and

the

• I

32

TRANSMI

TTE

R

RECEIVER-TRAN

S

MITT

ER RT- 3

0(

)/PRC

- 1

RECEIVER

Ct

C2

C3

C4,A,B,C 0.1

C5

C6

C7

cs

C9,A,B,C 0.1 mf

C10

Cll

C12

C13

Ct4

C15

C16 Ct7,A,B,C

CIS

C19,A,B,C 0.1

C20 C21 C22

C23

C24 C25 C26 3,000mmf

C27

C2S C29 C30,A,B,C

C31

C32

5,000mmf

50mmf

mf

5,000mmf 250 v de

1o-232 mmf 25

mmf 250 v de

1,000 mmf 250 v de

1Q-232

500 mmf

1o-232 mmf KNOB

O.Ql

mf 250 v

0.5

mf

HOmrnf

5-40

mmf

to-261.3

0.01

mf

5-20mmf 5-20mmf

25mmf

50

mrnf

4-30mmf

1,370

mmf

PART PART

0.1

mf

0.1

PART

250

(working)

250 v de

(working)

250vde

(working)

600 v de

(working)

KNOB6

(working)

600 v de

(working)

mmf

KNOBS

250 v de

(working)

(workmg)

400 v de

(working)

mrnf KNOB 1

250 v de

(working)

600v

(working)

250 v de

(working)

250 v de

(working)

250v

(working)

250 v de

(working)

OF

Tl

OF

Tl

600vde

(working)

250 v de

(working)

OF

T2

vdc

C33 C34 lOOmmf

C35 C36

C37

C3S

C39

C40

C41

C42

C43

C44

11

de

ANT BINDING GROUND

CHOKE, FILTER,

CH

4.5

XTAL

1

FS1

5 AMP 250

FS2

de

JACK, SINGLE-CIRCUIT

I J1

JACK, SINGLE-CIRC

J2

COIL,

L1

COIL, OSC,

L2

COIL,

L3

COIL, AMPLR, L- F

L4

ANT LOADING

L5

de

RCVR

L6

RCVR

L7

RCVR

LS

COIL,

L9 LIO

COIL,

Lt1

COIL, OSC Lt2 COI L13 COIL, OSC, 114

COIL, OSC, L15 PART LI6

PART

lEGEND

OFT2

PART

250

(working)

PART

OF

T3

50mmf

5,000

250mmf

1,000mmf 250

5,000mmf 250

0.05 mf 1,000 v de

2mf

BINDING

HE...'-lRYS HOLDER FT-243 & CRYSTAL

M.iP

OSC,

AMPLR,

R-F

COIL, ANT R-F

MIXE~

~UXER,

L,

OSC TICKLER,

OF

T1

OF

Tl

250vde

(working)

mmf 250 v de

(working)

250 v de

(working)

(working )

(working)

1,000 v de

(working)

1,000 v de

(working)

600vde

(working),

POST

at 150

MA

250 v de

(working)

H-F L-F

H-F

COIL

L-F

COIL

COIL,

H-F

L- F

TICKLE~

H-P

L-F

Lt7

PART

LIS PART

v de

Lt9 L20 PART

:

METE~

VOLT CIAL SCALE

METER RECT, SELENIUM-OX-

TION

PANEL LAMP

DIAL

R1 R2 R3 R4 R5 R6

R7 RS R9 RIO Rll R12 R13 R14 Rt5

v de

Rl6 R17

RlS

Rl9

R20

R21

R22 R23

R24 R25 R26

R27

R2S

R29

R30

H-F

R31

L-F

R32

IDE

v de

UIT

R33

R34 R35 R36

OF OF

PART

OF

1,000 OHMS PER

SENSITIVITY, SPE· ISW 1

HALF-WAVE, 2-SEC·ISW 3

LAMP

6-8

100,000 OHMS 470 OHMS S,OOO

OHMS

4.17 OHMS

30,000 OHMS l

9.10 OHMS I

400 OHMS

O.S40

OHMS 1 2 MEGOHMS 1 100,0000HMS 100,000 OHMS 1 150,000 OHMS % 100,0000HMS 1 WATT 22,000 OHMS 1 22,000 OHMS 1 330 OHMS

POTENTIOMEp~R

25,000 OHMS

100,000 OHMS 6S,OOO

OHMS

22,000 OHMS

1,500 OHMS 330 OHMS

I MEGOHM

330,000 OHMS 6S,OOO

OHMS

330,000 OHMS

470,000 OHMS

220,000 OHMS 1,000 OHMS 7,500 OHMS 7,500 OHMS

40,000 OHMS 220,000 OHMS 220,000 OHMS 30,000 OHMS

T2 T2

T3

6-S

V 0.25 AMP

V

0.25AMP

1WATT

1

WATT

lWATT

WATT

tOWATT

WATT

'12

WATT WATT WATT

WATT WATT

'12WATT

V2

WATT

'12

WATT

V2

WATT

V2

WATT

l/2

WATT

lf2WATT %WATT %WATT lhWATT

'12

WATT

lf2WATT

'12

WATT

'lz

WATT 20WATT 20WATT 20WATT

'12

WATT

'12

WATT 20WATT

R37

40,0000HMS

RFC 1 RFC 2 PARASITIC

sw

SW

sw

ISW

sw

SW

T 1

T2 T3 T4

1 T

V l TUBE

R-F

CHOKE

SUPPRESSOR

BAND

SWITCH, XMTR

CONTROL KNOB

2

ANTENNA

CONTROL KNOB 10

SEND/RECEIVE SW.,

CONTROL KNOB

4

CAL. CW. PHONE,

CONTROL KNOB

5

METER

6

LIGHTS

BAND

7

8

OFF/ON

LINE SWITCH,

9

:;

SWITCH,

CONTROL KNOB 5

CONTROL KNOB 7

SWITCH,

CONTROL KNOB 2

CONTROL KNOB B

CONTROL KNOB

1st

1-F

TRANSF.

2d

I-F

TRANSF. BFO. TRANSF. OUTPUT

MER

POWER TRANSFOR·

MER, RECTIFIER UN

IT

JAN

osc

v 2

v 3

v

v 5

V 6A,B TUBE

V 7 TUBE

V 8 TUBE

TUBE

·1

TUBE

JAN

POWER AMPLR

JAN

R-F

AMPLR

JAN

ER/OSC

JAN

AMPLR

JAN

TECTOR & BFO

JAN

M.1PLR

RECTIFIER

20WATT

2.5

SWITCH,

OFF/ON,

455

TRANSFOR·

6V6

S07

6SG7 RCVR

6SA7

6SK7 I

6SL7GT

6J5 AUDIO

JAN

5R4/GY

MH

9

12

4

REC.,

A

455

KC

455

KC KC

XMTR

'XMTR

MIX·

-F

DE·

,---

\

JAN

KEYI REL

VI

6V6

N G

AY

-,

\

~8

A 8

X

L-------~----------------------------------------

+ -

METER

F G H J K

\

j.

------------~----------------------

*

NEW

SW3

\\\\

\

c

SYMBOL

\\\

,,,

\\\\

12 \ \\\

SW 6

REPLACES

sw 7

L 6

ER

Tl

UNIT

VB

JA N 5

R4/

PP-

GY

ANT

\

~

DI

PANEL LA

MP

A L

L AMP

RECTIFIER

POW.

•

FS

LI

NE CORO

PLU

2

G

swa

T5

-----------x

+

R35

Figure 20.

Sch1ma1ic

diagram

of

Radio Set

AN/

PRC-1 ( ) .

•

JAN

C4A

--l

VI

GVG

!--------+

KEYING RELAY

\\

f;b

SWI

\\

\ \

\

I~

....

n J I

_l_KEY

,-

\

TRANSMITTER

\

~B

-,

cwo.o'

cw

RECEIVER-TRANSMITTER

SW3

\

\\\

ANT

\ @

\\\\

L6

RT-30(

sw

7

)/PRC-1

---"-~.,-7

V4

JAN

GSA

7

.-----

I I

RECEIVER

c

41

\\\\

c

12 \ \\\

C40

T4

--0:2

I

HONE

1

CI7B

1

-=-

OUTPUT

PEDANCE

SELECTOR

(SHOWN

NECTED USE

WITH HIGH-IMPEDANCE

HEAD-

SET)

IM-

CON·

FOR

A B

X

L-------~~------------------------------------------------------~---------------------------------.X

D E

F G H J K

\

~

NEW

SYMBOL

SW6

REPLACES

PANEL LAMP

+

DIAL LAMP

•

Figure

LINE

20.

Schematic diagram

CORD

PLUG

of

Radio

Set

AN

FS 2

SWB

/PRC-1 ( ) .

RECTIFIER

T5

POW

•E R UN

JAN

R35

IT

VB

5R4/GY

PP-36

METER

( ) I

PR C -I

RECTIFIER

CH.

R31

R

32

R33

R

36

9

POWER

CABLE

R

37

Tt.

15640

33

63

C:

c

c c

c

SECTIO"N V

SUPPLEMENT/\RY

MAINTEN

Ref

symbol

, C22

'

C3,

C39

C5, 3DA5- 14 CAP

C13

acates

ANCE

PARTS LIST

Signal Corp\

stock No.

2C5130-30

3Z741-

1Z774-7

309025-29

, 3DA10-53 CAP

stock available.

11

309050-50

30 9250-20

30 9500-61

3DA1-50

DA1

370 I

3

3DA3-75

FOR

RECEI

VER-TRANSMITTER RT-

Name

of

pMl

nnd dcKription

RE

CE

:IVER-TRANSMITTER RT-3

IP

RC-1.

ING

BlND

ro

g dw

BIND

fee

a

ss

St

CAP ACITOR:

-+

VO

CAP

vo X 1468.

CAP

VO

CAP

vo X 146

CAP

±

vo

CAP

+

vo

CAP

±

vo

.1::

VO

±

vo

POST:

und post; North American

g. No. Sl.Oll.Ol.

ING POST:

d-thru; antenna post and insulator

embly;

.501.00.

1

O%;

X 1468.

ACITOR:

10%;

ACITOR:

10%; 250

X 1468.

ACITOR:

10

%;

7.

ACITOR:

10%;

X 1467.

ACITOR:

3o/o;

250 v de

X 1467.

ACITOR:

3%;

250 v

X 1467.

ACITOR:

10%;

X 1467.

ACITOR: fixed;

10

%;

X 1467.

push

type;

push

type;

North

250 v de

250 v de (working); Aero.

250 v de

250 v

American Phillips

fixed;

mica;

(working); Aero-

fix

ed;

mica;

(working); Aero-

fixed;

mica;

v

de

(workin

mica;

fixed

;

(working); Aero-

fixed;

mica;

fixed;

mica;

(working:);

fixed; mica;

de

(working); Aero-

fixed;

mica;

(working); Aero.

mica;

de

(workin,g); Aero-

0()

insulated;

Philli

ps

ceramic

25-mmf

50-mmf

250-mmf

g);

Aero-

.

500-mmf

1,000

-mm

f

1,

370-mmf

Aero-

3,000-mmf

5,000-mmf

10>,000-mmf

DATA

30( }/PRC-

Quan

Run-

per

ning

unit

spares

-

I

1

l

2

4

1

2

J

1

4

2

1.

Orgn

stock

-

*

4th

3d

ech ech

-

1-

*

* *

*

* *

*

* *

*

* *

* * *

--

5th

ech

*

Dep

stock

*

-

ot

35

63.

MAINTENANCE

PARTS LIST

FOR RECEIVER-TRANSMITTER RT-301

1/PRC-l

(contd.l.

Ref

symbol

----

Rl7

R16, R23 3RC20AE331K

R

2

R30 3RC20AE102K

R22 3RC20AE152K

R3

R20, R21 3RC20AE223K

Rl4,

R15

R5

R19, R26 3RC20AE683K

Rl O,

R18 3RC20AE104

Rl

, R

ll,

R13

Signal Corps

No.

stock

1

-----

225850-16

225850-17 225850-15 225897

3F6327-2

227228.40

227598-29

227270.

3RC31AE471K

326580-17

3RC31AE223K

326630-38

3RC31AE1041<

--

1'14

1<

-

• lndic•res stock availAble.

Name

of

p~rt

and

description

--

------

K N 0 B : black wood;

2K733BA North American dwg No. marked

KNO

B: (as above marked KNOB : (as above marked LAMP: pilot; 6-8-v, 0.25-amp; Mazda

46; miniature screw base.

METER:

American Phillips dwg 01;

internal resistance, 100 ohm

North American Phillips dwg No.

De J

All696;

"6").

d-e;

ur

-----------

Syroco

(for

multi-scale per North

No

Amsco No. 5-310-0-1;

Phillips

3-i"

shaft;

"8").

"11").

. SL230.-

±2%;

No.

s L.221.02.

RECEPTACLE: female; 10-contacl; H.

B. Jones

RELAY: keying; DPST; normally

open; contacts rated

rna; #A-16134.

POTENTIOMETER: Singl

25,000-ohm; linear taper; volume con. trol;

RES

ISTOR: fixed; carbon; 330-ohm

±

RESISTOR: fixed;

±10%;

RESISTOR: fixed; carbon; 1,000-ohm

±10%;

RESISTOR: fixed;

±10%;

RES

ISTOR: fixed; carbon; 8,000-ohm

±10%;

RES

ISTOR: fixed; carbon; 22,000-ohm

+10%;

RES

ISTOR: fixed; carbon; 22,000-ohm

±10%;

RESISTOR: fixed; carbon; 30,000-ohm

±10%;

RESISTOR: fixed; carbon; 68,000-

±lOro;

RE

SIS.TOR:

ohm

RESISTOR:

ohm

Co. No. 310AB.

a-c coil 5-7.5;

Globe-Union type

10%;

~-w;

Erie 504.

1-w; Erie 518.

~-w;

Erie 504.

~-w;

Erie 504.

1-w; Erie 518.

~-w;

Erie 504.

1-w; Erie 518.

0-w;

Erie 504.

fixed; carbon; 100,000-

+IO%;

±10%;

~-w;

fixe

d; ca

1-w; Erie 518.

1,000 v

C.

carbon; 470-ohm

carbon; 1,500-ohm

Erie 504.

rb

de

at 50

P. Clare

NF-113

on; 100,000-

e.

Co.

section;

.

ohm

Quan

Run·

per

nin~:

Or~:n

unit spares stock cch cch cch stock

1

2

-----

2

3d ·lth 5th Depot

* * *

*

* * *

*

* * *

*

* * *

~·

1

*

* * *

1

2

* * *

* * * * * *

* * *

2

3

* * * * * *

* * *

*

* *

*

* *

*

* *

*

38

•

63. MAINTENANCE

Ref

symbol

Signal Corps

stock No.

---------

R12

R29

R25, R27

R28

Jh

4

R9

R7

SW2

SW3

SW.5

SW6

SW7

T1

T2

T3

T4

Vl

V2

V3

V4

3RC20AE154K

3RC20AE224K

3RC20A334K

3RC20AE474K

3RC20AE1

3RC3IAE125K

326040-67

329826-24.4

3Z9826-24.3

329826-24.2

329826-24.1

329826- 24.5

329641.137

229641.135

229641.136

229632.343

2J6V6 2}807 2J6SG7 2J6SA7

PARTS LIST

RESISTOR: fixed; carbon; 150,000-

ohm

RESISTOR:

ohm ±

RESISTOR: fixed; carbon; 330,000·

ohm

RESISTOR: fixed; carbon; 470,000-

ohm ±

0.5K

RESISTOR: fixed; carbon; 1-megohm

±

RES

±

RESISTOR:

±10%; (cathode bias for power amplifier).

SWITCH: rotary; 2-section, 6-position;

antenna loading; PhilJips dwg. No. G8.710.09.

SWITCH: rotary; 2-section, 2-position;

send-receive switch; North American

Phillips dwg. No.

SWITCH:

position; North American Phillips

dwg. No. S1.701.02.

SWITCH:

ON-OFF); dwg. No. S1.701.08.

SWITCH:

(receiver BAND

American PhilJipsdwg. No.

TRANSFORMER:

ability tuned) ; North American Phillips dwg. No. G8.230.19.

TRANSFORMER: i-f; output; (per-

meability tuned); North American

Phillips dwg. No. G8.230.20.

TRANSFORMER: BFO; North Amer-

ican Phillips

TRANSFORMER: a-f; output; 2-wind -

ings; 20,000-ohm primary; 250-ohm secondary; North American Phillips

dwg. No. TUBE JAN-6V6: VT-107 TUBE JAN-807: TUBE JAN-6SG7: TUBE

FOR

RECEIVER-TRANSMITTER

Name

of

p1It and description

±10%;

+10%;

10%;

ISTOR: fixed; carbon; 1.2-megohm

10%;

JAN

r:;-w; Eric 504.

.fixed;

carbon; 220,000-

10%;

r:;-w; Erie 504.

10%;

r:;-w; Erie 504.

y;;-w; Erie 504.

1-w; Erie 512.

.fixed;

wire-wound; 400-ohm

10-w; Sprague "Kool-ohm";

North

Sl.701.07.

rotary; single-section,

rotary; SPST; (panel light,

North American Phillips

rotary; 3-section, 2-position,

SWITCH)

i-f; input; (perme-

dwg.

No. G8.230.18.

Sl.231.00.

VT-100-A.

VT-211.

-6SA7: VT-150.

American

; North

S1.70l.03.

.

5-

RT-30!

l/PRC

Quan Run-

per ning Orgn

unit

sp:tres stock ech ech ech stock

1

2

1

-1

!contd.l.

;d

*

4th 5th

* *

*

* *

*

~:

* * * *

* *

.

*

* * *

Dep

ot

*

• Indicates stock available.

39

•

64. MAINTENANCE

Ref

symbol

V5 V6A, V6B

V7

C44

C42

C43,

CH

,

FS2

R35

R34,

R31, R32

R36

R33, R37

SWs

Signal Corps

stock

2J6SK7 2J6SL7GT 2J6J5 3H4698-36

3DB2-27 CAPACITOR:

3DB2.1009-2

3H4698-36/ 1 COIL: a,.[ choke; .filter;

3E7207

3E7142-4

322605.2

323275-1

3H4860-2

3RC21AE224K

325475-9

325610-1

325620.1

329692-1561

PARTS

No.

I

LIST

FOR

RECTIFIER

Name

of

part

TUBE JAN-6SK7: TUBE TUBE JAN-6J5: RECTIFIER

CAPACITOR:

CORD:

CORD: 25' long;

FUSE:

FUSE EXTRACTOR POST: Littelfuse

RECTIFIER:

RESISTOR:

SWITCH:

JAN-6SL7GT:

POWER

PRC-1.

v

de

(working); metal

609.

000 v

Aerovox 1009.

rna; Langevin

Phillips dwg No.

American Phillips dwg No. A12336

(power

receiver-transmitter) .

18AWG;

parallel rubber covered; terminates in

plug, Hubbell No.

1358, type 3AG.

No. 1075A; (holds fuse

enium Corp. BS; voltage).

ohm ±toro;

ohm 2"

ohm ±10%; 2"

ohm

2"

North American Phillips dwg No.

$1.701.08.

de

(working);

d-e

resistance, 210-ohm

#L-674.

18"

long; 8-conductor; North

cable

Underwriter's

5-amp, 250-v; Littelfuse No.

selenium; full-wave;

of

(meter rectifier for reading line

fixed;

fixed; wire-wound; 7,500-

+10%;

T.

fixed;

T.

fixed; wire-wound; 40,000-

±10%;

T.

rotary; SPST on-off power;

POWER UNIT PP-36! )/PRC-1 .

and description

Vf-117.

Vf-229.

VT-94.

UNIT

PP-36()/

.fixed;

paper; 2-mf; 600

case;

Aerovox

fixed; paper; 2-mf; 1,-

metal

case;

4.5

h, 150-

±15%;

North American

S1.211.07.

from rectifier unit

2-conductor No.

Labs.

Inc.,

7002; (line cord).

FS-2).

Sel-

America type EMBY

carbon;

.

~-w;

Erie 504.

20-w; Ward Leonard

wire-wound; 30,000-

20-w; Ward Leonard

220,000-

to

Quan

Running

per

unit

spares stock ech ech

1 1 1

1 1

1

2

1

2

1

2

1

Orgn

1 1

3

.

>I<

*

4th 5th

3d

1-

--

>!<

* * *

>!<

*

>I<

* *

*

"' "'

>!<

* * *

* *

*

"' "'

* * *

*

* *

ech

--

>I<

>!<

*

"'

Depot

stock

- -

*

•

>I<

•

*

• lodka!t$ stock available.

40

64

. MAINTENANCE

Ref

symbol

SW9

T 5

V8

3Z9826-24

2Z9613.378

2J5R4/GY TUBE

PARTS

Signal Corps

stock No.

LIST

FOR

RECTIFIER

Name of part and description per ning

SWITCH:

position; line voltage selector; American Phillips dwg No. G8.710.

01.

TRANSFORMER:

(primary tapped for 115

v,

220 dary No. 1, tap; secondary No. 2, 5 ondary No. Development

v,

JAN

and 250 v

rotary; single

1460

3,

Co

5R4/GY.

POWER UNIT

1-pole,

.filament and plate;

v,

150

ac,

50 cps; secon-

v,

120 rna, center-

v,

3 amp;

6.3

v,

3.2

amp)

. No. A4359-D.

North

v,

200

sec-

; Audio

PP-36(

5·

Quan

unit

I

1

l/PRC-1

Run-

Orgn 3d

spares stock

1

- -

-;---

1

(contd.l.

4th

ech

- -

-

* * * *

* * *

*

5th Depot

ech stock

--

MAINTENANCE

65.

Ref

symbol

PARTS

Signal Corps

stock No.

6Zl11

2Z303-l

2Z303-2

2A276-23

627560-9

2Z1859-ll

3E1201A 3E1605-6.5 CORD

2B8300 HEADSET 2Bl300 INSERT

225884 LAMP:

LIST

FOR

Name of part and description

ADAPTER:

prong adapter;

2089.

ADAPTER:

D. Wood

ADAPTER:

D.

Wood

ANTENNA:

North American Phillips dwg No.

120618.

ATTACHMENT:

Wood Elec. No.

CASE:

CORD CD- 201-A:

KEY

carrying; per

amended.

CD-605:

30-U).

J-37.

testing transmitter) .

RADIO

SET

AN/PRC

Ediswan base to American

C.

D.

Wood

English type prongs;

Elec.

No. 73.

European type prongs;

Elec. No. 2064.

reel assembly, complete;

plug body;

2053.

spec.

(for

key

(for

Headset

HS-

30-U.

M-300.

neon;~

w; GE

T-4-~;

1 ( ) MISCELLANEOUS

-

Quan

per

unit

1-

1

Elec. No.

C.

I

C.

1

C.

D. 1

271-3053,

U-37).

HS-

(for

1

2

1

2

I

Run·

ning

spares

2

Orgn stock

-

"'

4th

3d

ech

--

-

*

* *

*

•

* * * 3Z3437

* * *

5th

ech

- -

--

* *

*

>!<

*

* *

Depot

stock

*

* * *

*

* *

*

• Indicates stock available.

I.JNCLASSIFIF.O

:.~~·lH

...

tl ·-...

Sy

I •

t'-1

c:-f

e~

b

oY

.•

,('\.(\_

~

...

.....

__ ...

.

)..co

.....

........

uu1c

....

4:-

z.

:

z.

....

...... --·

....

.....

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

.

0

.

~.~~.t$.

~

..

·s

,/

.~~

........ .

2262o-P-44-08; 400, lo-1.(_,..(

41

Sl.~t

-

Tc

h · .t:.,

..

meal

COl

u

-

,!:

~c

A,...f:A

!:>o

'

Cllmcnts C

...

p

)

enter

..

.J

/

ERRATA

TM

11-638

WAR

DEPARTMENT

RADIO

CA

UTION:

B

EFORE TRANS TAIN

Pr1ge

"Headsc;t" should read "Headset "Key" "Techni

J l

-638".

The following components should be listed:

1 Cord

l Mounting

1 Cord

1

Cry~tal

holders

1 Wrench for 8 32 Allen Head Set Screw.

l

Wren

Prtge

"76"

l't~ge

"(5)

Page

"(6)

Prlf!,l' 0, P

"Cord CD

in.".

Ptt

,~e

' PLT. VOL." should read "

Pttge

This entire

1 0 contains

Page

''ground wire and selected crystal".

REMOVING

MITTER

THAT

I,

Pt~r.

should read "Key ]

ca

CD

CD-605

ch

5

Pt11.

1

should be " 101".

6,

P

Allen Wrenches,

6, Prtr.

RT

/ PRC- 1 INTO

THE REC

2.

l Manual" should read "Technical Manual TM

201

A 18 in.

(for

key J

(For

Case CY

Ff

-24

3 and crystals.

for 10 32 Allen Head Set Screw.

'8

.t.

r1r.

II

r1.

I 1 b.

OR

EIVER DIAL

-37"

(For

37).

Headset H

86/TRC-10,

Add:

(2)."

Add:

INSERTING

SUITCASE

READS

HS-

30".

.

Key ]

-37)

S-30).

including 47 crystal

Spare fuses."

r/1',

10,

12,

1 ) d.; P

20

Pflr.

P.1r.

p.u.waph

·17

Par.

r1r.

7 3

b.

1

A"

shou

ld

read "Cord

23

tl.j

Par.

2)

c.

PL

T. VOLTS".

l2

b.

should read "CASE

Crystallloldcrs FT-243."

33

h.

Omit:

CD-201-A

CY-86/TRC-

SET AN/

RECEIVER

BE

CER-

BELOW

.

18

TECHNICAL

PRC-1

Page

During this operation, and 5 megacycles in the low band,

2.

Select the dip at the highest frequency indication. incorrect wiJI

be noticed

P

age

During this operation, at certain frequencies, between 4 and 5 megacycles, 2 dips may be noticed. Select the dip

at

dip

is al the frequency paragraph 40 i.

MANUAL

(

15-36.c. (

8)

.

at

certain frequencies, between 4

2 dips may be noticed.

dip

is

used, no minimum plate current drain

as

called for in paragraph 36 C

16-40.g.

the highest frequency indication. used, the high pitched whistle will not be heard

of

the inserted crystal as called for

If

Page 17-41.f.

During this operation, at certain frequencies, between 4 and 5 megacycles in the Jow band, 2 peaks ticed. Select the peaks at the highest frequency indica-

If

tion. current drain will be noticed

41

Page

'

To power to the antenna, hold the against The increase with

Page

"powered iron" should be

Pttge

"Immediately adjoining Condenser C 41,

minal block.

attached to this block.

nearest the front panel, the receiver is connected for use

with a low impedance headset.

the

the incorrect peak

h.

17,

Par

..

fl

i.

Add:

insure the operator that the transmitter is delivering

the

metal portion

neon bulb will glow. The intensity

in

creased power output."

20, P

ar.

46.

20, P

ar.

48. Add:

There

position nearest the condensor C 41, the receiver

is

used, no minimum plate

as called for

base

of

the neon bulb

of

the antenna bin

"powder~d

is

a wire, white with blue tracers

When

this wire

iron".

is

When

If

the

(11)

.

the

incorrect

in

may

be no-

in

paragraph

ding

post.

of

glow will

is

a black ter-

in

the

positiot~

this wire is

in

is

~l

c

1)

~EQ

l

/.

..

CAPACI

exa

Th in

Black Brown

Hcd Orange Yt:llow Green Blue Violet

Gray

White

Go

Sil

TY

MARKI

mpl

e .000

25

<: colors employed to

NG:

mfd. = 250

For

coolin

mrnf.

clesi~nate

the~e

the position required for readinj: of words

,,

Color

/(1//t:l'fl!

0

J

2

3

-1

5

6 7

8

9

ld

ver

No Color

MICA

CAPACITOR

g purposes, capacity

sig

nifi

cant digits

moldc:d

in

Voltr

100 200 300

400

500

600 700 800

900

1000

500

COLOR

in

mmf

C<N:, or

CODE

i'

expr

essed

.1re

li~teJ

br

.urow.

S

in tenw; of micromicrof.uads. For

below.

Code~

"'"

plu:r

'"

10

100

1,000

10

,000

100,000

1,000,000

10,000,000

100,000,000

1,000,000,000

.l

.OJ

are:

re.ld from left to right

l

T

of

10f~

20%

er.mre

1%

2%

3% 4% 5% 6%

7C(,

8%

9%

1-

Dot Color

toleran

ce

is

Code::

20r

(.

1.

The

2.

The second dot indicate' the second digit to cap.Kity.

'\.

The third dot mdicates the numher of zeros which follow after the

EXAMPLE:

Red

R.M.A. Color Code: When

6-Dot

togc:thc:r

On

mu as

with voltage and tolcrance information, it

unih

marked with six doh,

ltiplier indicated

shown

in

sketch.

This is

Green

by

mecl

to

fir~t

dot indicates

the:

indicate capac

the;

Bl

ack

it

i:.

nece,sary to

upper

thre:e

ity

(in mmf.) where

first significant

indic.1t<:

is

desirable: to

dob

arc:

the lower right hand dot. The remaining

the:

working \'Oltage

c.lig•t

of capac

::!5

thrc:e

s•gnific.lnt figures

e:mploy

ity.

nunf.

the 6-Dot Code.

fir~t

of

cap.~eity

s•gnificant figures of capacitr

dot~

arc:

tolerance and

is

500 \ .d.o. and the

two

c.ligib.

.0000::!5

(such

in

mmf. multiplied by the

D.C.

work1ng

mfJ.

:h

.2750

\Oitage rating,

mmf.),

/ e

t

•

(t

,/fJr

Blatk Brown

H<.:d

Or.1ng<:

Ydlow

(,reen

IJI u<:

Vio

let

Gray Whit<:

(~old

~il\'tf

No Color

RMA

Significant

0

2

3

4

5

6

7

8

9

COLO~t

fig"re

CODE

FOR

RESISTORS

D~:l'im

t!

,\IHltiplier

10

100

1.000

10,000

100,000

1,000,000

10,000,000

L 00.000,000

I .000.000.000

0.1

Tolerance

1

1C(;

?C

'

- 0

5%

5'0

10%

20%

cfij~.

ABCD

Band

A indicates the first significant

Bane.!

B indicates the second

Band C indicates the decimal multiplier. Band

1)

indicates the toler:tnce limits about the nominal resistance value.

~ignilicant

figure

t\f:J]=

~

A C B

Axial Type

Leads

of the resistance of the resistor.

Jigure.

Radial Type

Leads

3-

J +.-

~2-

TM

~

.

11-638

c 1

_s-!)-

9

CrrANGES}

No

. 1

T~

l

11 638, 13 October 1944, is changed as follows:

2.

RADIO SET AN/

PRC

-1 (

),

LIST

PONENTS

Sec fif.(urc l for ill ustraLions.

QUOJI·

lily

*

1 1 1

*

2

1 C 1 1 P lo.te K 1

1 W

3.

RANGE

*

Cnsc F /

llcadscL HS

Key J-37. TM 11Cor C

AN

/P RC- 1.

* •

638.

ord

CD 201- A

d CD 6 05

ey

rystn.l

Co.se CY Crystn.l Holders rench

for 8 32

rench for

* *

b.

Transmitter. The opcntting range

approximately 50

8.

WEIGHT

* *

a. Tho

sens cusr.

abo

cu

ut

104 pounds.

rr

ying CllS(' * * * wooden

Th

is compi

('omponcnts

*

30

- U.

18

in.

(fo1·

Mounting (for K

10

32

(for

Heo.dset HS-30- U).

86/

TRC-10, incl

FT

243

Allen

head

Allen

head

*

miles.

*

(•Le

overseas

Key J-3

ey J-3

o.nd crysto.

* * * * *

11.

CARRYING

a. Tho cnso housing

9)

conta

ins:

CASE

* * *

• * * * *

(5) (Added.)

b. The rig hL-Iuwd neccssory

5)

contuins:

• * * * *

(6) (Added.)

Tw

o A

Spare

ll

rn wt·rn

rust'S.

dws.

compartment

* * * *

13.

KEY J-37

a.

Key J-37

The

key is

filled with Coni CD

b.

Cord C

l

'lug

PL-55.

accessory

(Fig.

7)

is n * * *

mountrd

l>

201

.\

Tlw key,

compartment

on a bnkelite base

201

- .

\. (18-inch)

(18-i

nch)

wit

h * * *

.

OF

7).

setscre

*

unit wei

(figs. 3

the

contacL

terminates

COM-

*

7).

udin

g 47

ls.

w.

*

* *

*

ov-er

*

arm

and

.

left-hand

*

-

ghs

~md

(fig.

.

is

in

WAR

WAsm~c·roN

23.

METER

a.

Control knob 5 *

*

SWITCH

*

OSC. PL'l' . OUR.

PLT LINE

*

32.

INITIAL

*

b.

(Superseded.) Cnso

ta

ins 47 Cryslttl llolders li'T-243.

*

PROCEDURE

* *

DEPA

25, D. C., 7

5

*

.

VOLTS

VOLT S

*

CY-86/TRC

RT}.lEN'T

August

tho

control

*

- 10 con-

* * * * *

33.

INSTALLATION

TER

AND

*

h.

RemoYe the headset, key, and

from

the

Insert.

36.

the

PREPARATION

*

c. Checking Transmitter

* * *

upper ll'fl-hand accessory

phone * * * jack

*

* * *

(8) Wit.h atmg.. frequ band

~

t

th mcor ren t drain subp

t~e

D~r

mg

en ci

es

between 4 an

, 2

~ip

s

m

e

hi g~es

rect

aragraph c (11)

dip

~

IS

will

OF

RECEIVER-TRANSMIT-

RECTIFIER

OF

POWER

SET

*

FOR

marked

USE

*

UNIT

antenna

compartment

* *

key

. * * * oscillator is oper-

t

his

operation,

ay

be

noticed

frequ

ency indication.

used,

no

be

notice

below

d 5

mini

d as c

.

at

me

in

. Select

mum

alled

plate cur

* * * * *

37.1. EQUIPMENT

(Added)

a. General.

list

(par. 37 whether properly. The check list gn:es

chcck<'d, the of

corr<'ct opcmtion, and the <·orrecltvo mcn.sw·es

that arc

cbeC"ked

items anu

ilem

.2) will help the operator_ to

Radio

the

opern.tot· cnn

bdore

8 through

17

when stoppmg.

PERFORMANCE

The

equipment performance

Set

AN/PR~-1(

nonMl

indicn.twns

l.nkc..

starting, 1tem 7 wlnle

16

nrc

<:hccked

Hems

CHECK

det~r~e

) ts_ftmctwrung

the

tlems

an~

1.

during operation,

8 through 16

1945

knob

.

*

ree

l

.

KEY

.

*

cer

tai

n

the

low·

the

dip

If

the

-

for

in

LIST

ch~ck

to

be

tolerances

throug~

starltng,

6

002130°-15

1

should

operaLing

ing

bo

continuous

b.

Action

checked

period

opcmLion.

or

Condition.

or

informaLion giv<'n

column and For be

given

tions

that

the

allowable

Tho

operating

between

c~nsidcrcd.

side

troublo.

operator

tive

d. Corrective

urci:l

wiLhouL

is completely corrective

shooting situation

tainrd

37.2.

consists

controls

other

taken

c.

Normal

listed

the

items.

in

lhc

operator

under

items

order

normal

include

In

tolernnces

actual

motor

frcq ucn.cy; however, if the

the

limits

s~Lisfn~Lo

the

ltmtLs

If

Lho

shou

m

easures.

lisLPd

ld

1u·e

Luming

inopornLivc

mcnsures

is

nrcessary.

r~q

uires

and

1f

the

EQUIPMENT

of

it

Ind

ica

Lhc

gwen

indientions n.ro

npp

Meas

thoHc

Lhe

Ll~aL

soL

PERFORMANCE

.......

---------------1

1\oy

,J

~

p::

0

[:-t

<

~

ll<

~

ll<

- -

--

[:-t

e;j

[:-t

rn

I

2

3

4

5

()

Ll

--

ON

7

37.

Headset II

Antenna..

Crouncl.

MWI'KH

N I

•;

H

OF

S-30

fiWTTf'TT

\V

I'I

f•,

Hw ii('IJ

aL

least

once

nL

l

east

in

the

seLl

which

ings

Lhc

rcprcsrnLs

to check tho

indication

tion.

the

visible

will pcrceivr when

case

of

tho

readings

dmiog a normal

four

times a

For

some

action

of

vnrious

item

is

an

action

normal

column

Tb

c

normal

and

mctrr

readings

will

depend

items

or

to

bo

that

indication

.

audible

he

readings,

are

meter

Rpccificd, operation ca.n

ry

..

A m.cter ref!;ding

ts a srgn of 1

Jy Lhe

ures.

LhaL

scL

do

rccommcudcd

Tho

Lhc

in for repairs.

or

if

noL

yield results, trouble

However,

communication

1s

noL

completely

not,

C'Ot·t·ocLivo

operator

lhe

mpendiug

normal, tho

cun

If

recommended

if

the

be

inoperative,

CHECK

-------

Action

Plug

in

lO!:Y jack.

in

PI!OKE

bmdmg

~ro111ad

bu1 d mg. post.

!u LIN

(.o JWopm· voltu.go

c:nl.ed

by

Co

ON

'CIJ

- (

) .

(A).

(II).

l~lug

Co1~ncc:t

Co~ncc:t.

(fl)

,

Rot

Soc.

Hot

day

dur-

the

condition

switches

checked.

must

indica-

signs

checks

the

given.

on

the

reads

be

out-

correc-

mous-

make

the

set

tactical

mnin-

LIST

(Added)

or

condition

jack.

lead-in

wire

to

~

}JOH!Llou.

reading.

·

to

Ground

!IH

post

.

J!;

vour

meter

po~iLiou.

the

operator

as long

e. Items 1 through 7.

be

checked

f.

Items 8 through

show

COITccL

as

iL

must

maintain

is possible

each

Lime

meter

to

do

Hems

the

SPL

12.

J tt•ms 8

rrndings

Lho

so.

is

for tbc

sectionofRccei,•rr-'l'nlnsmittt•rRT

when

the

trnnsmitl<'r is

operation. 'l'ltc

the

SEND

with

Lhe

on

items

g. Items 13 through 15. These

general

Tho

charncLerisLi<"s of the

he

ni;,ing

s

uch

eLc.,

h.

tdt•groph

the

fronL pane•l, nncl

except

operating

operator

m u

sL

usc

chnng<'H

as

relay

when

Llw

Item

16.

when tho cnli

when

it

is ncccssnry

prcdctcnnincd

i. Item

the

indications

tr

ouble

the nrxt

ANT.

incli-

17

soL

is t.nkcn ouL

in

the

cxpe<'tcd

M<'kr

Ul{<l.

aL

meler

HEC.

switch

kc·.Y

item

8.

C'hat'll<'l

must

Lhu

L k

nowll'dg<'

in audible

clicks,

sPL

is noL OJH'I'JtL111g properly.

'l'h

i:~

i I

lmtLion

to

frrqlf('Jtcy.

.

This

of

this

timr

scL

nnd

period of operation.

N

urmnllllfllt•ttluu

r·

t•nclM

Jino ''

proprrly

n'IHiings

in

lhe

pl.uggNI

wtlh

the

C'risl

iC's

be•c·om,t•

sc•t

dunng

ns

und

visible indications,

kcy

i

ng

t.o~lC

c•m

I

H't'd

he pet·

of Utr rc•ceivrr is

srL

Lht•

rec(•ivcr

ite•m

is pc•l'formcd

oprmlion.

nrc

probably

should

be•

oil

-~

soL

in

operat

J

through

put

in

operation

through.

transmttter

30( )/PRC-1

Luned

arc

read

SEND

in

the

l<cy

fnmtltar

normal

ll

KEY

closed for

items

represent

o~

~he

rn.dio set.

wtth . the

operat10n;

hnsis for rocogin

Lhc

formed only

checked,

to

an

whenever

Any

nbnormnl

caused

corrected

ion

7 should

12

and

in

with

position,

jack

all

headset,

or

exact

by

before

.

SECRET

Hom No. Item

-:----l----

8

9 Oscillator plate

10 Amplifier grid 11 12

13

14

15 16 Calibration.

------

Plate

H.EC.

SEKD

(Key

(Key depressed.)

Fint\1 amplifier

rent.

Antenna

depressed.)

Key (o-w operation).

SEND VOLUME control (3) .

----------------1

17 ON

OFF switch

----

--l--------

voltage (SRr{D

switch (J

position).

dopres~cd.)

(Key depressed.)

current,. (Key

REC.

2)

in current. curreut.

pla(.o

O

lll'

(12 switch.

(B).

Action

Set

METER SWI

PL

T.

VOLTS position.

Set

METER

OSC.

Set

-

Set

Hold neon Key

Throw

Rotate

Check rccci \'

PLT

fvlJo:TBR

AMP. GRID

MET

ER i3WJTCH

AMP.

PLT

binding

clockwise dii·•:)ction. outlined in p.aragrnph

post

transmitter

to

REC.

VOLUl\IT

--

Throw

to

OFF

or

condition Normnl indication

--·----------1

TCH

SWITCH

. CUR. pos

SWITCH

CUR

position.

. CUR. posit,ion.

lamp

against

.

position.

~

control in

e•·

cal i

brat

iou

~0.

(5)

it

ion.

(5)

ANT.

n!!

----

-----------l--------------

to

Meter

reads

mately 1,000

to

Meter reads

ma.

Meter r

to

Lamp

n.u~hin~

eads

Me(.er reads 75

mu.

glows brightly.

Keying tone

in

headset.

l1card in headset.

Volume of signal

heads

et

Diu.l cali

-1-----------------1----------------

Set

position.

inoperative.

10

1

noise

increases.

bration

approx

\'olts.

to 20

to

1

to

is

heard

or

signal

correct.

ma

100

i-

.

in

Corrective moosures

Check

line

voltage.

Sec

paragraph Rctuue Sec

Check ANT.

Sec

Check See

oscillator

(Sec par. 61.)

paragraph

li\G

control.

paragraph

hcad~ct

tune receh·er.

paragraph

61.

.

41. TUN-

61.

cable,

58.

40.

RECEIVER

CALIBRATION

* * * * *

.

g.

~

1s .osCJ

tam

l~w

d1p the

cp~·css

llatmg.

freq

band, 2 dips

~t

the

mcorrect

whistle tho

i n

graph

Hul'to<l

i below. ·

*

41. USE OF

the

t1·ansmitlcl' * * *

~uring

uenc1es

between 4 and 5 me

may

high~st

d1p

is used

will

not

be

o1·yatul

•

THE

TRANSMITTER

this

operation,

be

noticed.

frequency

the

heard

us

~t

oo.llotl

*

indication.

the

for

* * * * *

f. D

t•

p•·<·

ss

tho

transm i

rnlihmti

f1•eq uencies band,

peak

If

pinto

for in

allow. the post.

to

The

oront~o

• * •

46

pn.

miuc<.l.

on,

Du

ring thiH

between 4 and 5 me

2 peak::;

a~

the

1nconect

oun-out

:mbp

* * * * *

i.

With

tho transmiLL

Hold

metal

If

the

tho

unt~nna,

intensity

d

power

'l'llE

.

1-F

AMPLIFIER STAGE

'J'h

o sig

citor.

nal,

llowcv

and adju

may

high

peak

drain

arag

mph

the

base

portion

transmitter

of glow

output.

CAL. POSITION.

after

cr,

sted

Llc1·

• • • the din!

oporl\Uon1 ot

bo

noticed.

est

frequency

is

nsod,

will bo

h

cr • • • untcnna will

of

the

* * *

•·csonnn

over

noticed

hol

ow.

the

neon

the

antenna

is

dolivoring power

neon

will

bulb will glow.

inoronse

A l

wy

fix

co

a nruTow

of

crysta

at

c:er-

in

the

Select

the

high-pitched

frequency

in

subpu.:ro.

* *

certa

in

the

as

called

against

binding

with

is

dctcr

of

moans

low

Solect t

indication.

no

minimum

bulb

irtg moHiLo1·

ed

ceramic cn-

L15

ran

ge

he

in-

of a core of

of

whi<"h

of a thrcnded rod.

l

amplifier stage.

48.

A-F

If

Tho audio compouont

chassis.

is a black

of

(white

-

bloclt

the

front

use

with a low-imped

th.

s . e

1

W?Xt

capac1

use

with a high-imp

motol tug attached

in

the

front

tho

headsot

on

one

D PI

<d<' f,ll

.LV,

J\

IAlNT]!;NANU_l<;,

II

W:

NOTE: Failure

used

byd

reporte

e ort rmy

) b A

R

p -'f y R rt)

(u

nsalrs

letter containing

Ouure 20

57.

RECEIVER ALI

...

a. General.

PllONE

powdered

is adjusted, with

AMP

LIFIER

iron, the

rc_spcct

The

s1gnal

STAGE

~o

IS

.*. ';

Immediately adJ

terminal

with

blue

iR

connected

panel, the

is

connected

C41

or

the

• h d t

panel

should

used.

'd

of

Sl

ArmWy

on

aclory

without

the tag

e · SF.('TfON

<'

noff'

undr

or

unsalrs

GDroAunGdOFoF,co~~

. F

1r

or ~ , , .

A

epo the

If

·

data eli

rtptoduel

GNM

*

All

adjustment

jack

J2.

Connect

ommg

block. Wh

tracers

receiver

)

to

tl~e

rece1ver

ance

to

the

rum.~:lng

t~rmmal

1s

head::>et.

ternunal

is

edance

to

tho PIIONE

be

The word

· f 1 y performance

c~s

4ither

~

cited

no

turn

HIGH

and

LOW

•r th<'

oc

co

h<·n~lrng'

ouu suiJ

a4t,s

atJLuL

0

d

Army

Service Forces will

(Unsatisfactory Equipment

A

on

rmy

form

rs

not ava1lable,

L 1 f h •

by

h

re

samp

ple•

o

ltl11

ENT

*

s shou

the

terminal block undornouth the chassis

the

low-impedance

par.

48.)

-

mum

clockwise position.

Mak

output

.

e ccrtnm • 10

.,

terminal.

COtt.'-'ial

* the

capae1tor

LJS

po

sit

ion

~

y

~eans

r-f

.r

eceive

C:41

on tho wu;o

to

this

nearest

connected for

connected

ea

ed

on

A'

rr

fo

tm.

When

nearest

for

Th

se

. e

)

ac~t

on

to

mdicate

appears

the

other

'

o Lbo follow-

of

equipment

F F

orces orm

prepare

e

orm

s o

wn

* *

ld

* * *

lead

on

the

"'

• * .

(S

DlaXl

r

.

be

54

Ill

to ee

-

SECRET

3

b.

1-f

Alignment.

• • *

si

gnal and signal g

uou

tl tho

low-pot

c.

beat-frequency

b ubovo.

the in

most

d. High-frequency alig1m1cnt lator trimmers.

the

tho and of

the

connected For

58.1.

a. Ground more War port, and Lho

Chi

b. "When

Air

Forces occurs

nel

hould

s c

hann

c. contnin!ng sh

own

of

tho

61.

SERV

d. (Supersedecl.)

t.ivo

If

(1)

incr

PJ~1r.

for

oscillation.

thnn

noL funcLioning inv<'SLigttLion. prop

erl

15

ma.

when

OJH'I'Illing frC'quency. . .

(2)

lf

bul

the

final

the

generator

connect its

rid

of

gh a

0.05-mf ent

Beat..frequency Oscillator Adjustment.

CW.

output

ANT

GND

front

locatiou

*

ia.!

Set

position. Remove

cases.)

of

the

of

(t

hrough a 400-ohm

posLs in

pan

as

described

of

*

UNSATISFACTORY

(Added)

When

Dcparim

forwarded

Forces

often

WD

troub than

ent

AGO

ef SignalOfficcr,

trouble

kol

is

normal,

be

els.

H ei

*

on

plnce

OUR.

normal

the

filled out,

ther form

the

111

fi

gure

form.

ICI

NG

* *

both

bands

grid

current

the

position

(21

y,

Lhc

plato cmrenL

and a dip

osc

illator

t,he final

plnLc

current

amplifier

The

intel'lnediato frequency

coil windin!,rs.

for

an

output

high-potentinl

the

mixer

seri

es

* * * n

oscillator

the

CAL

CW.

Oscillator Alignment.

* * * hi

All

adjustments

the

signal

the

el,

* * *

upprr

and

in

Set

of

output

Lube (Lcrminal 5

capacitor.

eo.

r 10 volLs.

* * *

PHONE

the

output

gh-frequency

arc

gencrn.

tor

series

rig

with

subparagraph a auov

to figtu

ht-hand

!.he

·o 16.

* * *

EQUIPMENT

le

in

cqnipnwnt

or

Army

repair

UnsaLisfacLory

Form

Lbrougb channels

in

more

is

data

19.1

THE

If

proceed for

~IETE

and depre

If

tho

ma

properly

If

Lhe

in

Luning con

a.mplifi~r

.

f5cnricc Fol'<·es Otcurs

P<'I-somwl

468,

vVtt

cquipm<'nL

ofLcn

Army

<'li<_~itcd

.Air l•'orc<'s li'orm 54

and

not

available, pr<'paro

w1thout rep

TRANSMITTER

Lho

LmnsmiLter is

as

the

finn!

R

fmTI'C

plate

or

more),

_nnd

oscdl!~tor

w11l

plu.Co eurT

gml

d1p IS

nsed

f<•cl

Equipment

sho

1ild

to Lhc office

shingLon

used

Lhtl.ll repair

forwarded

by

the

roducin

*

follows:

nmpl

il

ss

the

cmTcnt

Lhc

rc9uircs

1s

be

app

en

L.

tro

l

1s

CliJTcn~

no~

obtumcd, check

the

455 kilocycles

lead

subparagrn,p

made

connected

output

be filled

25,

sample

ifi

in

key

osc1llator is

fun~Lioning

roxunaLcly

wrll be

Luncd

4

standard

to

the

of

V4)

Connect

Tb

switch

to

* * *

Rc-

oscil-

with

to

resistor)

corner

meter

0

REPORT

by

Army

is normul.

Re:

out

of

D.

C.

by

Army

person-

through

letter

form

g copies

*

inopera-

er

is lnck-

the

OSC

to

check

i~

higher

ft1rther

no

Led

to

Lhc

Js

normal

(a) Place

A:\lP.

while noLing tho final nmplifier grid eurrenL is lower

the

bia

sed. the check

e

h

(4)

J'L'l'.

tho

tl

l~lplifi

w1Lh

pin lc is oblninNI, excilaLion amplifi<'r is dcfccli\'

(5)

PJ/l

tho

.

this

59. e

(6) When

mcusurc mcL<:r

rcndmg

pumgrnph

(7) i\Lcnsure tho

Yoltagc and voltng<'S in

(8)

percent,

niL.

circ

(0)

du plit llltl pln

dupliC'I~l{'(l

pow<'l' oulpuL.

(10)

tJ·ansllli~lt•r

clkcking PO\.n•J· cnl rlm\

62.

the

GRID

oscillator is wid

Lho

Pla

ce

CUR

fin

al

<

ll'

kuob eurrent

Phtee

'. VOIJL

plnL

J·end

shu!

lf

voltugcs

J{cpln.co Lhc

ttLc

c<'nwnL

Rcpl•llL

output,

Lion.

l\IETER

CUR. position nnd depress

Us<•

a high-resistruH'c d-e

rcsisLor

bias voltage.

t.hc

.l'v!E'l'ER

posiLion aud di'JWt'ss

ampli Aer

to

rcsom~ncc

8, malung

is

the

METER

'S

e circuit,

ing

wiW1

the

the pin

tt

resistor

w1Lh

59. · compare

paragruph

of

normal,

rcphtccmcJtL

to

the

for

ngainst

* *

lacking

and across

noL

position

def

to

the

in

defecLlvo (:ompononts wiLh cxacL

of

mainlniu

normnl

frcqut•ncy

SWITCH

tlum

normnl, <'xcitntion

or

the

Lhc

SWITC

plnLc

ruJnlnt.

for

cerlnm

more

limn

is

O.

SW

l'J'C

Lo

chc<"k

of

the

finnl nmplifier.

Lhe

normnlr

ective

cathode

tlming

slnge

roiLttcYc

normal B rcadrng shown

a.

check

wiring

th<'

from t

to"'

ground.

Yoltn~c

these

r<•nd111g:;

59. circuit

tho

purls

and

originnl

proc<'SS

OJH'J'ulion

:o;

IH'rificd Hlnndn

rnn!!:<',

*

MOISTUREPROOFING

grid curr

tulJ<'

voltmeter

CttLhodc

ll

~h<'

plntt• currt>nt

lhatl

LOO

hu·king

ll

the H voltage

oadi ng in pu.racrntph

hnH l><•cn

It

nro

components

wh(lll

pnrts should

u11d

AND

ING

*

c.

Step-by-step Instructions for Treating

AN/PRC-1(

* *

(2) DISASSEM

*

(c) H0moYc tmnsmiLtcr uni

t,

frorn

*

•

)

BLY.

* *

lh<'

chassis

the

case.

six

*

* *

scr<•w

in

tho

s holding

cttl>O

nnd

* *

(knob

t.

(knob

nnd screen-grid

possible. Ori"'i-

5) the

ent

is

not

properly

rosisLor

5)

ho k

ey,

Tun

c

the

Lhc

minimum

ma

.

If

or

the

5)

Compn

localized,

t•

B-sidc

.Compnre

to

tho normal

noL

wit,hin 10

in

tho

key

.

from

across

i11

Lho

not,in<•

fim.Q

dip

no

clip

fiunl

in

tho

of

t.be

Lhis

of

th.n.t

If

Lo

in re

in

be

stt'l.

hility

and

check

on

both

nccuracy

*

FUNGIPROOF-

*

* *

tho recc

remove

b,mds,

rds

*

Radio

*

SECRET

and

the

for

of

Set

ivcr-

tho

TECHNICAL ftlmVI

FOR

FROM

TO

"0"'""

MAN

0RG

'-"TuRe

V,.ACTURBR

Signal

ANIUTION

175

GUP11niOR

SupplY

Radio

~-123-.A

__!!i!erican

£QUIPMDn'

PART No·

~tk

Df!SCRtfi'TtOH

DATil

DRIE'IP DllBCJUP"TION 011'

WITH

Radio

Set

Sig

No.3EJ.7-2

OP INITI

15

01'

AL

Jan

Capacitor

C I

'"'Luna

TAOUDUI

Operation and

fungiproofing

TRAINING OR

I'OOil

TYPm

NAME.

S~U

l

FA

IR

CAA~

E.A.Wilaon, 175

Signal

I

CHIEF

0"-AOC.,

'rCCHNICAL OORVICif

AND

TO

NAN

~

CC

Corps

Signal

HEADQUARTERS

See,

Transmitter

Radio

Corp

WHI

CH

USED

SCR-456.-A

TYPm

1-mf·

AND

C20

shorts

45

UNUSUAL

in

tropics;

..

l.

0,..

USINO

ANo

oAOANtlATtOU

.,.AnO

N

WAR

DEPARTMENT

UNSATISFACTORY

Reooir

Hq

(f/opplko/}lf)

DEFEaiVE COMPONENT

Capacitor

PltOOA~

1-DtVICII

treatment,

PI:ASONNUL

IOOODI

let

Repair

Co

Fourth

TYPII

Arrtt;f

Sig

Sv

COMPLETE

Ground,

u.

s.

" ·

~co.

No.

Order

1234-Phila-45

in

Tank,

Yedium,

U4

DESCRIPTION

C20;fixed 1 "'""u

500 vdcw American

CAu

• c

(I/

c4tlll*ol

'ItO"

..,

out

CONDITIONS

heavy

due

to

I

TOTAL.

YEARS

- - -

AND

rainfall.

20

RI:COMM£NOAT10HS

Substitute

rtJ~~VItt4,

humid

TIME

IN:r~LL£0

I

MONTHS

ANY

RD.4

Was

Jan

45.

Cl/

operating

1:DIAI.,

capacitor

ORIGINATING

Lt,

Sig

C

Co

fiRST

ENDORSEMENT

EQUIPMENT

lorrATIONAPO

MAJOR

ITEM

vehicular

No.,

••

,.,

......

NO

'"CTun•n

.....

a44itlon41 fPGCI U rrqtdrt4,

A

tut

62rt

of

I••>

YO

ACTION

TAt<

replaced

OFACER

Radio

conditions

TOTAL.

YaA~S

CN

Aesigned

REPORT

liO

""i2345

CAUSE

Corp

PERIOO

,

..

O~H~

and

set

.,.,.

blr

OFl'1Cif

WTATION

MATERIEL

'Moom.

A

Of

TROUB

OP'

OPERATION OI!

I

OA;·

given

l

fl/

/fl'

•'

for

tropical

DATil

1

Feb

45

STATION

APO

102

1'1!

CHNICAL S£RVICII

Signal

Corpa

IOATK5RJ::'45

LE

~;:·

INGTALLEO

en

manufactured

FORII

PAIL.VAE

I

HOUR&

I

MI~

moistureproofing

operation

I

DATa

T

"D:NDS

SECRET

1.

It

1a

lmpen.Uvtttbat th• cbltf

Tbb

form

1 Tbb form

3.

C.

4.

IS.

7.

8.

b dol.f&O«t

wUI

Jmprovtng

IUld

Tbts form wjll oot

replaotmonc.

Rtporuof

It

laty or

Wbtn CMeS arb& wbi'rt

•nthort:.od. Tbta r

Tbfs

lb.rou&Jl

Ntct

wUI

OOfTOC-

OlbN

r

iMity for

msUunctloos

not.

bo

U\'t

Wustrat

orm

wiU bo

oom1naod

re

PrfttliOftMoor

actlou.

tt!!or tbb

to

l•dltcatt

bo

ntNt

tor

n:portln«

oorrnetlog aueb

bo

uJOd

ror

i)A!t

or the

be:oo

and

de~l,.bla

Addhlonel

h·e

mau-rtaJ

It

ts

orm

sbo

uJd

mtl!do

out

ehAno.eb.

f(ln:lw

ot

~«:hakal

RrVIot oonotrned

wth

repor"'

·

~

ma.nurtt.ccurtna.

dl'lfccLJ.

rtponl

nr

ot

parts

a.oclrl~ots

In

ptrtlntoot frtQnotuloo uot l>rovldtd

ara

blgbly

D60MS&t7

be

u-'Od

Jn trltlllcoto

iU

b6do&errnfned

co

llDd

t

or

~

tAOtl.l'eS,

lnvol,

a

dcslrAbSe..

to to

Jn

bnltttd

nnd

C"Qulrn'tDI.

•ln.r •mmunhloo will rotutnuo

ll

COM'S

to

nil

commu.nlcato

oooftrm

roa»rU made by

by

U!ln~e

or

bJ

U~

Figu

re

lnsttu<tlons

bft

advic.-dat

tbro

provldt

•

unUorm

dcosflfl, or Op('rotfonal drftcLS

rt!

C:ODifih•Udluc

mM

..

rl*'l

11

tJors not rtpl&ot

all

bl

ank

~~,ofthnn""~pt)rt.

wifh a

<birl

wvlco

or""rlftatfon.

wlna

or

H'f\!klt

~

0.

mttbod

modJncuUons

dtf\'CLS

or ml1tunct,ons or

Cot

ot

stf'91oe

more

n:Pt(1JUow n'le&tl&

ttoOPI.

WD

AGO

tnrllf''t

« tubmlltlnc

turrtollr

to

hf

wJ,mitltd

ln

lh

o blllok spaces

tn

Two

ordu

ooplta

Form

prstdral

mC'Im~o

cbt

rn

of matfrhll.

tf

rtqatred

mactntl. p...troleum

m::ufrlf'

l

autbot1&ocd

..

,

di~U<I

f)wt,·tr.

th«~

repo

thould

co

asrure

aa!tt7

will

be t

orwardod

468

t

o1

any

eoDI1tUcttooaJ,

data.

toc11.

blbrlc:ul",

m:u

ltlug trom

ttonat

or per1ormaoce

fo

tbt

mano('t

rt

&hould

bo•ubumt.l'<J

to

P\!fi.JOn.otl

dlroct

talr-wt.M".e.otl·tc.ar

bG

t.s

R&

to

opera

with sample

dNI&D, or

Md

presc:rYinr mat.ul&ts

R'l(OC"d•.

.dNnibed

In

odosuroe

tecl)BICAI

entl'ies

AR

u posstblo

to

tho

torVIoo:

.

oomplete l

. more oprt41tJous

lbo

ope,.tloaal

or actlden

t3.1

7.»-10 Ccbaogo lu

order to

rorm.

llb

otognt.phs, a

~

ot

~mmauJeaUOD

ODO

OOP7

ddtet

wtlb

dama,

No.3).

trped

will

tn

mftttrle

•

go

Dor

l~

bo

torwardoct

vie

v

tor tbo

~

kelebes,

are

TL

l.

to

19589A

5

SECTION

V

SUPPLEMENTARY

62.1.

MAINTENANCE

AN/PRC-1(

Tho following

May

1945. The appropriate pamphlets of the

ASlt'

Signal Supply Catalog for Radio Set

PRC

- 1 are :

) (Added)

information

Orga

.nizational Spare Parts

SIG 7-AN/PRC- 1 SIG

7-HS-

PARTS

was

30

FOR

compiled

RADIO SET

on

10

AN

f

For

n.n

Lho

latest ind

SlG 2.

DATA

ind

Fliyher

ex

Ech

elon Spare Parts

SIG 8SIG 8-HS 30 SIG 8-PP- 36/PRG I SIG 8-RT-30/PHC 1

AN /PR

of available catnJog pamphlets,

ex

of ASF Signal Supply Catalog

e- l

sec

6

SECRET

APPENIDIX I (Added)

'

66.

MEANING

PREVENTI

OF

VE

MAI~~TENANCE

PREVENTIVE

MAI~HE

NANCE

Prevr11~ive

of

<?P<'t·utrons

eqUipment,

br

eak-downs,

and

Lo

ke

To

undct:

tena~l

t<',

ventrv<'. The prrrne functron of provonLive mn.inLenn.nee is to

7J~event

repatr.

tr<?u

~lc

ens.hn{J

mamLonn.nce tem forman the

effi~IcnLiy.

radto radio

echelon

nar~cc.

maJOtcnancc.

67.

shooting

of rn.dio

ce of

.air

oporn.tors

soLs

NOTE

:

(organization operators and rcpairmrn) maintc-

Some opcrat.ions in section

DESCRIPTI

NANCE

a.

Gen

in

Radio

prcvcn~ivc

t~n.an

co

kmd

of

maintenance

~ore,

LtOns cannot cont.ains

sonnel

na~co

Ad

the

as follows:

----

some less.

must

be

assigned

operations: Feel,

Jus t, and Lu bricato. Throughout

lctt.ering syst.cm for

1~'-Feel

]T- TighLon C A Adjust.

l

.r

•1

'ho

Lubrlcuto opornUon

mnir\tcnaneo is a

prrformed

whrn

Lurned

unwanted

ep equipmen.t oporn.ting

st.~nd

what

tL

~s

necessa

mamLen~nco,

b1·ealc-downs

On

the

other

defects.

when

properly. (Soc

The

and

The cannot commun

every

set

it

is needed,

Thcl'cforc,

n.nd

operations

ON

OF

at

ofl',

intcrnrptions

is

meant

ry

to

distinguish

troubh• shooting,

and,

therefore, the necdl for

hand, tho

repn.ir is to locale

importance

be

ovot·omphasi~ed

ication depends on

.

It

musL be

iL

is

vitally

repn.ir

men

'1'13

in

seel ion

PREVENTIVE

TECHNIQUES

eral. :

Most

of

t.ho

olcctrical

Set

AN/PRC

maintenance.

varies. Some

be

followed.

applied .

Lhcso

specific

to

Inspect Clean Lubricate*

Is

- 1 ( ) require This

parts

~han

others. Some rcq uirc

l)ofinito

Thi

perform

not npplicnblo to Rndlo Sot

and

Jli

s section of

inskuctions

tho

Inspect,

tho

six

sysLC'mn.tic

rrgular

Lo

by

intervals

elimi•mte

at

Lop

preYentive

bct.w<.'

prime funct.ion of

of

1·eady

and

it

must

imporlnnt ·that

mn.intain

SIG

123.)

II

arc first.

IV

are

higher echelon

preventive

require

specific inst,ruc-

L-or-miss techniques

tho

t.o

six

bn.s1c

Tighten,

this

operations

AN/l'llC-l ( ).

sorics

major

in service

C'fficie:ncy:

main-

en

pre-

and

repair.

n.nd

correcL

prcn~n

.

Lhe

Lo

Live

A sys-

per-

0'0

op~rat.o

their

and

second

MA

I~HE

parts

used

routine

mn.in-

a diil'erent

mam.un.l

~uide

per-

maintc-

Clean,

manua

'vill

TECHNIQUES

The

first two needed. SelecLion of lmowl<•dge count<•rNl

on

t.ravcl filters care

is t weather bent.), excessive dnmpuess, snow, cause

~ithou.L frequen~

equipment break-down

to

blower whethe

ovorhcntcd. Fooling will show

on

cation correction. familin.r wit.h of

reco

soon othct· maintenance

opern.tion observer AlthouO'h these defects

<·orrosion

t1ghtcnmg, clemung,

b.

Feel.

check

motors, and r electrical conpections

or

motors,

gni~c

NOTE:

as

c. Inspect.

interior~

invaluu.blc corrccl<'d break-downs. To a dofccLi, thoroughly functioning. observing their

l

bo

color,

I

nspect

(1) 0

Yer·hcating,

blistering,

the

container; leakage

and

oxidat.ion of

Placement,

(2)

cabling

Clt'nnlincss,

(3) cesses in especially beLwccn

operations

of field

on

dirt

into

akcn

(such

rotating

the. existence of

signs of

It

is importAnt to perform

possible

in

will overlook evidences of

with

Lime

befor

1'o

all

for

the

or

nrc

thr

equipment

t.o

prevent

as

heavy of

inspections :md.

becomes

when

iL

The

feel

machinery,

The

maintenance

tho

normal

transformers,

overheating

after

is

done.

In

spect

preventive

performance

and

e

t.h

oy

be

soL,

make

familiar

Inspection

parts

placement,

following condtttOns: .

as

bulging

metal

by

in

their

by

units

show

if

the

oponttions

needs

. li'or example,

roads

O.'\."POsed

undependable is needed most.

operation

drive

shut-down

ion is.

effort

able with of

indicated

observing

original

carefully

for connecting

dm-ing

no

i

l.

raill followed

surfaces

and

lulmcaLmg

such

motors,

other

operating

and other

. '

and

the

~namt.enanco..

may

not.

can

lead

to

recognize

every

indi~ations

cons1~ts

the

cqmpmcnt!

state . o.f

of

tl.'o

of

msulatmg

contn.ct

positions

accumulation

other

is bnscd on

cross-country

matter

Rapid

is

also

and

the

defects

man

the

of

be

major

how

changes

by

blistering

and

icc

and

the

necel'sary

operations

and

subject

used

most

as

dynamotors

to

deicrmin~

bushing

need

for requiring

mu.~t

tcmperat.urcs

parts

feel operation as

always before

most

important A careless

mmor

at

the

tho

e~tu

snved

tf

and

tho

effort.

by

par~s

smfaces.

Lhn.t

examining

to

of normal

of

cleanhness,

drscolora.tion

or

surface

compounds.

all

leads

.

terminals

four

aro

a

dust

en-

much

in

tend

to

parts.

t~

often

arc

lubri-

become

to

any

t.roublc.

moment,

ipment,

they

aro

costly

signs

of

become

carefully

noticing

etc.

of

'

and

all

re-

of

dust

and

SECRET

7

binding should mn look

(4)

mounting

d.

Lions be necessary

Whenever a loose be applying

parr.~.grnph

fungipt·ooflng.

e: eaLion rotating of a

on

68.

NOTE: shut-cluwu. Scvure

the

a. Inspec

(J)

caps,

of

en

ps,

if

possibk.

(2)

wiLh

Lension wiLh

condition 'l'ho broken (a)

Mn.

in

not

Lhem

tends

sarily

Lbo

(4.)

soekcL,

N

C'ver

nccLions

b.

Lo

t,he Lube

nccLions arc tigh

the

apply

cmC'k

•Tho Lubricate oJ)('ralion is

posts.

lJ

o free

ttcr.

In

for

fungus

Tightness,

which

Tighten1 Clean,

explain

fol l

owed

throughout.

CAUTION:

uot

bo

ened

beyond

designed

mOJstur<'proofed

the

Lubricate. *

of

grease

shafts.

li"'ht

oil

t> •

Lhc

e4UJpment.

VACUUM

Do

envelopes

In

spooL

uml

dirt

and

grid

gxaminc

the

grid

of

wirrs

strands

] n

sp<'cL

ko

tho

inspection

Llle

socke

by

pnrLiul~y

Jrom

to

weaken

spread

tube

sockets

J3C'

cnrcful

especially

j

nr a warm

to

Tight

en

Lrnin

g.

sockets

('XCC'SSiVO the

bushings.

Pnrts,

of

dust,

tropicl•l

growth

by

nppenrs

themselves.

in

performing

Screws,

tightcn0d

the

will

be

conn<'ction is tighL<'ned,

varnish

62

for

det.ails

Lubricntion

or oil

It

rna.y

to

door

hinges

TUBES

not

work

burns mu.y

of

hot

t-uhe!l.

t

(1).

glass

Lube co1mccLor

caps,

should

u.ncl

for

corrosion.

or

the

spring

caps

resulting

wires

be

.

the

firmness

ts

and

witJhdi:aw1ng

s1dc

to

the

conln<:ls

nt

the

envelopes

for

soldered

LcsLUl.g

s~dc..

pms

wh~n

tf

t,u

LlJO

grid

caps

(T).

Tigh

sockets

dirty

Wbcn

to

or

tigh

the

insulnled

prossw·e.

no~

8

cmmections,

corrosion,

and

high-humidity

~nd

tC'sttng and

damaged

and

ou

free

b:y

mildew.

nny

io

be

loos<'.

A~just_..

Sp<•c1f

them tH·e gi

Lb

is

section

bolts,

cnrl'l<•ssly.

pr<'ssmc

with a small

to

rnotol

corrosion

for

or

fungipt·oofcd

of

moisLmcproofing

refers

Lho

bNtrings

ah1o

mean

or

other

the

tuiX:, umnccliatcly

result from

.tube onvclopes

chps

'rubes

should

clips

that

loosrtwss.

to

of

frayed

of

Luhrs in Lheir sockets.

prossing. tbc Lubes

t.hcm

lhc

1\.fovcmcnt of n

11~

LIH•

base nnd unneces-

1n.

lhe

tnnc

ll_t<'

Lub<'s

~·('m.ovmg

1

t ISM

1

)('. \\

,

h1gh-)~O\\

and

other

fon•ign

coru1cctiDn

These

1c

procedures

. and

Fittings

which

broken.

the

sliding

for nccumula

wit,h

make

and

the

m that,

Lubes

sockcL. Inspect,

~

tuhc

n,ys 1 omove

.

opera-

ven

wherever

nuts

should

Lhcy

it

should

again

brush. Sec

to

the

of

motors

applicntion

surfaces

contact

loose pln.te

be

replaced

contacL

for

loss

Check

spring

insulation

position

nne~

ji

nrc

remov~cl.

, It:om

e1

and pln.l o caps. .

Lon

nil

loose

connect

Lo

Lhc Lubes.

co

rro~l

cd,

clrnn Lhcm

l<'lllllg

opplicablc to llodlo Set

loclw~•

l>u

rroo

11lUCh

If

Lhe

Ls

thn l

slllngs, do

pressw·e will

A:>l

/l'RC-1(

before

joints

areas,

or

to

tight-

nrc

by

and

appli-

or

after

with

tube

1

tiou

of

the

clips.

or

clowH

ggling

tube

tls

tube.

con-

tons

con-

hold

n?t

).

c. Clean (I) n.Lccl grid

betiHt:'lC

tcrmina.Js. voltages cttps do

noL

Lub<'s.

(2)

Jtcmovc envelopes proper clNmNI wntpping

rubbing llC?d<'d;

W1po

(3)

When tacts to

romove

69

. CAPACITORS

a. Inspect (1).

(1)

]nspccL

for

insp<'cL !;tn•ws, for

poor insulation,

rot.

If

Lht>

S('(•,

crnekNt

(2)

Thorou

(C).

('lcnn

the

al,

high

<·olm<'clion.s

of

possible

In

and

do

not

permit

with a cl<>an,

core

is

with a piece

tho

the

nor

Lho

cnp

Lube

a.ro

necessiblc, fine srwdpaper

corrosion,

corrosion

the

mountings

studs,

Cut

mva.y fra.ycd

wire

is

thnL

the

ot·

broken gl1ly insp<'cL

fixNt <'npn<'ilor

(:n

lnsp<'cL

dirt,

dust,

or

plnt<'s

would

tuning. panel OJ)<'t·n.Lion

illgs, llN·essarJ. gasl,et.

(I)

laL<'d

or

for

caus<'

Rotate

Luning

b. Tighten

Etnd

c. Clean

C'lrnn I

bushings,

corroclrd.

si~YJ1s

of

connect

Do

(C).

he

con usunlly

<'n>t·,

if

the dC'posit

moisl.

<•n

the

(2) ()l<'all

with

a smn.ll

rlHst

n.nd

li

nt.

70

. RESISTORS

a.

Genera

in

Rndio

to

t.llr

or

soldct·-lug

l.

Set

various

tubes,

voltages

contrasL, tuiH's

not

must

leakage

luwing

if

ncc<'ssnry.

nne!"

lw kt•pt

('xpos<•d

require freq uenL

di..rt

to

accum u

dusL

and

dirL from

li.nt-fr<•t•,

used,

the

grid

of #0000

paper

surface

is

it

with a clean

the

and

or

exposed,

term

for

the

lint.

thrm

control,

the

(T).

cas<'s of fixNI

The

be

cloth

the

brush

Dust,

Various

AN/PRC

type.

nround

. Exc('Sstve

necessary

sockets

terminal~

loose

brackets.

inals

.

lenks,

plates

of

u:JmngP

to

the

lo

dry

nrc

oxidation,

of comwctions.

to

discovN

crncks,

sLrn.n<ls

wmp

of

Lhe

tlw

hul~-!:<'S,

of

vnrin.bl<' cnpaciLors for

Examinr

tou<'h t

moYahl<'

nnd thus

capncilo1·.

Tigh

tc•n

loos<' l<'rminn.ls,

ions

011

not

brrnk

and

all

cnpnC'ilor

cleaned

in

plates·

or

resistors

Lhc

cmln<•diom~

"it

O(

dirt

dry-c-l<•nni11g

of

pipr

if

pn'Sl'II

types

1 (

nrc

Tubes

ilh

I'\

posed

fr<'<'

of

dirt

bel\\

<'I'll.

grid

opcntt.ing

grid

clt•n

ning.

In

to

on low-voltage

the

glass

dry

nnd

plnJc

caps

snn.dpnper

~h<'

cnp

pressure

grip

the

c:ap

<'loth.

c·kn.

nc•d

n.ncl

may

1wd dirL.

Jar~<'

nx<'d

loose

Exnm

inc

nnd

cvid<'nces

on

LIH•

iL

with

ft-icLion

cn.

pucitors

ens<'

of

nnd

discoloration.

lh<'

movnblc

or

misnlig-~1ment

IH·

fix<

•d

plates

platrs

ehcck

tlw

c·npn,ciLors,

husiJing

<'npnC'i

tors,

lhaL

c·ns<'s

und

h

n.

dry

doth.

iS

hnrd to l'eiDOYe,

solvl'nt

vMinblt• capac.:itors

elNti!Pr, r<•moving nll

L,

111ay

cause

of

r<'sistors

).

The

connections

either

of

opcr-

plate

nne!

and

dusL

nud

plntc

at

low

and

plate

However,

or

mctnl

cloth.

mny

and

gently

is

tightly.

the

con-

be

used

capacitors

Carefully

mounting

the

leads

of

dry

insulation.

tape

m·e 11

each

hu·go

set

that

during

using

for

proper

mount-

when

01·

damage

the

insu-

arc

dirty

bushings

llow-

(SD).

arcing

nrc

usC'd

the

pigtail

SECRET

If

be

by

not.

.

0L

of

the

.

b. Inspect

rr~us:rnumcled

ch1ppmg, bodi

<•s coloration, Inspect, lcttds

rosion,

iu

the

all

mountmgs.

with

pig~uil

of

brcn.kmg

Lh

ey enter Lite

cannot

c.

Tight

mountings whetwvcr resistor break

d.

Clean

(1)

Clean

(2)

Tho clean \Vipo dirt

doposiL is

ckauing solv

(:3)

RPsistors

c·

JNtnt•d. Discol

been

overloading

prior

prohahly tLnalysis cedures

71.

FUSES

a. Genera

PRC

- 1 ( )

place

by f

rcmoYed fot· inspoc·ti n.way

when.

b.

Inspect

dence

of

c.

Clean

holder with a clean

72.

RELAYS

The

exterior noL bumccl, pitted, lined

up Lrnvel freely nnd the conncet.ions

insuln.tion is is

sccul·cly

s

igns

of

a. Inspect

(1)

Inspect

may

be

mirro

r.

(2)

Uhcek

make

ct•rLttin

(1).

lnsperL

.

resistors

rspecuttly

of

nil

typos

and

dirL,

dust,

co~uwcting

conncct

tho

be

n•paired.

en

(T).

is nllowed

the

connect,ion

at

of n•sisto

other

indications

all

other

looseness,

win•s.

()o

not

iou

eomwct10ns

body

of

Tighten

Ll1cy

to

remain or

s,. the

(C).

all

carbon

vit

.reous-onamolcd resistors

to

avoid

them

with a dry

unu

ent

wi

Lo

t.ho inspection.

due

and

COITPclion.

arc

described

l.

nrc

use

caps.

Lhoy

(1).

burning,

(C).

with

POOOO

cloth.

keying

is free

overheating.

from

nnd

correctly

not

mounted;

rch~y

resistor:::

INI.k:tg<•

sunlly

(SD).

Lh

discolo1·cd bodies

oration

nnd

ovc•rll<'uting

to

eir<"uit

i~t

Fusrs

function

fmyod

t1sed in

glass

cuse Lype

OJnss

on. blow. Inspect

duuTittg,

Olean

to

ft1

sandpaper;

is consid<'rcd

dirt

or

corrod(ld;

spaced;

tho rehty ltt·

o1·

n.nd

(1).

the rol

examined

tho

n.y for

with

mechn.nieal

that

when

the

con.Ling of

for

signs of

the

ends. rs

comwct1ons for cor-

and broken

Check

aLLt~mpt

bc<"n.usc

at

resistor.

resistor

ar<•

found

loose,

dnmnge

with

belwc•en

cloth.

hard

Lo

iud

it"ntes

The

trouble

Trouble-shooting

section

l~'ust•s

or

in a sMisfactory

tom;

IV.

ensc

should

tho

fuse

and

corrosion.

so ends

dust;

the

e Ligh

the

Lho

field coil

dcft•cLs.

aid

of a flashlight

act,ion

moving

cracks

Examine

for

blist<'l'in()'

of.

ovcrhe~'ting.

the

Lo

move

there

the

point t>uch

connections

loose.

,·ibmliou

the

body.

11.

small

must

the

llowcYt'r, if

remove,

tht~t

nt

sonw

dis(·oloru.tion is

which

Radio

and

arc

fuses

caps

nnd

then

wipe

normal

tlw

contnds

the

conln,cts n.re

moving

t;

relay

1'hc contacts

of

the

n nd

stltliounry

the

viL-

and

the

dis-

stm

nds

sN·urity

1·osistors

is

danger

w ht•re

defects

and

lf

m1~y

brush.

be

k<•pt

tennin11ls.

the

use

tlry-

cannot

Lhcre

Set

fl.t'<'

he

has

lime

requires

pro-

AN/

held

in

easi

ly

be tlu·own

for

evi-

Lhc

Ius!'

them

if

the nre

parts

m:uuwr;

the

wire

nsscmbly

shows

relnys

no

and

to

conLn.cts tact.

b.

and force they

c. Clean

of

(1) RELAY

of

the

clenn. t.

de

mung

or

H.eplnet> (2)

a

clean tt

burnishing

hurnisher,

OH.410G5C),

l

ween tacts blade

~ired

dirty dirt toothpick, dry

using

73.

a. Inspect

(

l)

nnd, rosion

it

will

the Hwitch noting

Hl)l'ing tension.

(2) Exn.mi11c t,he grmgc•d sw_itch.cs

contacts p1·y mrmhers

stationary

the ln Ltcr, n

l

cnws

free.

Dny

b.

swiLclws clenning

come

LogeLher

and

arc

directly

Tighten

mounLing screws,

Lo

hold.

(T).

damage

the

(C).

EXTERIOR.

relay

with a soft

hc

t•xLcrior

solvent

COITOclt'CI,

Clll

RELA.Y

rday

the

contacts

together

hack l't•sults.

to

rcq u i rc I urther·

with

nnd

~ooLhpic.k

a.

donn

SWITC

HES

ln

specL

while

so

on

nil exposed {'Iemen ts.

be

Hrccssfll'Y

switch

is

checked

the

frct'dom

arr

th(•

lc~wrs

shou

nwmbers;

should be Wiping

dirt

at

Clean

(C).

with

solvent

(SD

remove

'(•fully.

CONTACTS.

contacts,

tool (Tool,

WECo

1f

avn.ilahlo. Pineo

with

and

forth

""hen

eurbon

cl(•l\n

or

similar

blade

(1)

.

the

rnccbun ical ncLion

doing,

Yisunlly;

by

clean.

of

ld

sprcnding

Yisible.

act

ion

the

point

Clran

a stifl'

(SD) .

Tighten

screws

with a brush

).

bur·nish

No

of

slight

toinl.C'hlori<LC

with

of

look

to

in

flippi11g

of

lnspectton

the

make

and

of

brush,

74. COILS

a. Inspect

of

the ceram

ing

supports

b.

Tighte~

or

connectiOns

SC

I'C\\'

S.

c.

Clean

a

soft

(1).

Inspect

ic coi 1

form

. . .

(T).

Ttghten

by

reso

ldcrmg

(C).

Cl

ean

brush

.

they

in

line

with

all

but

do

or

brush.

If

connect

Llw

lcitds

with

switchboard,

.

2650,

the

rchty

pressure

n.s

nec<'ssary

contnds

ckn

.ni

n~,

the

mcLorin.l.

the

burnishing

for

signs

examine

others,

the

movrmcnt

s

witch

good

as

the

of

the

Swilch

contncls

contact.

the

rxt~rior

mo1stencd

all

coils for clemllin!'Ss

rmd

securetH'SS

~ny

the

coil

make

positive

t•nch

loose

connect

not

apply

to

break

Brush

If

it is

the

verv

d!ppcd 'in

1ons

und

clc1tu

When

npart.

lo.osc

WJrcs

necessnry

:t

dean

Sig

C'

sto(·k ::\o.

the

and

press

and

to

nre

sufficient!)

remove

a.pplied

flat

side

Again

tool.

of

each

of

dirt

In

some

tll<'

clements

the

nction

control

and

amount

~o

sec

1s YJsuul.

con

st.a Lio!tary

'fh(•

tnct

former

slidc·s

aciJOn usually

sur~nccs

of

colli~lounti

o1·

Lightening

form

and

con-

other.

ions

eno

u"'h

the

p111~ts

exterior

dirty

dry~

lll't'

dirty

theni.

to

blaclc

of

contncL

bla.

do

b(•-

the

con-

move

Lhe

obtain

n•rna.ini of

with t li

shou

w1Lh

with

n.

cl('l\.n

bumish

switch

or

cor-

cascs,

of

knob

nnd

LhaL

the

Do

not

rotnry

into

contnct

ld

rcmov<'s

dry-

moun

coil

"ith

de-

ng

of

tlw

of

e

be

of

L-

g

11

a

SECRET

9

75.

POTENTIOMETERS

a.

Inspect (I) Inspect orneter lh<'

shnft,

bushing

(2)

ln

sPtscl'cws,· and

(:3)

TCxnmino

ometer

(4)

Examine

corrosion.

b.

Tighten

mounting

c. Clean (C).

(l)

Clcltn

potentiometer

nrc

dirty

(2)

ltcmove

en.rbon

(:3)

If

Ll1em

with

(4)

Clean

ing a strip

tho

winding

(5)

Clean

brush

(1).

the

R17

.

The arm

Md

the

which

supports

spect

the

nuts.

the

for

duts,

all

(T).

screws.

the

exposrd

and

or

conoded.

~reuse

LcLraclllol'ido.

the

contact

erocus

the

contact

of

crocus

and

drawing

the

cloth

body

.

or

mechanical

should

shaft

sho11

iL.

nss(•mb

·dirt, mC'tnllie

insulnl

Tighten

the

and

sur

cloth.

surfrwe doth

of

ly

ing

crncks,

ports

contu.ci

connections

dirL from

faces u.rc

the

Llw

nud

76. TERMINAL BLOCKS

a. Inspect

(I)

Jn

dirt

, loo

(2) Unrofully

def

ects,

b. Tighten

mounting

sure

to

not

exert

C'Onncctions.

c. Clean (C).

quired,

doth

moisLe n Thorough bru

sh

77.

CORDS

'fhe

tho J ifc

<'ltbling equipment

to

tl.

o-reaL

a.

Jnspect

doLC'riornted at

tho

improper connections

and

improp

b.

Tighten (T). Tighten Joos<' . cable

coupling rin

c. Cl

ean

they

are

(1)

.

spcct

terminal block

se connection

exmuine

dirt, nnd

(T)

bolts.

select a screw

too

wiLh a

ed

ly

wipe

iL

Lo

remove

AND

cnblcs

liues

conncctin(Y

in

of

ml!st

ill

all

deal

(1).

insulaLwn,

placomo~1t

under stranr. Also

er

supports.

gs,

(C).

dirty

or

s,

n.nd

eonnecLions for

corrosion.

.

Tighten

Wh

<'n

driver

much

Clenn

dry

brush.

with

dry-ckaning

the

blo.ek

auy llnL.

CABLES

Radio

the

cq

uipmcn

be.

closely

]unds.

of

pumshmcnL.

Iu

~p<'ct

nnd

w!

rich

and

cable

Clean

connect1ons

corroded.

loo

loose sc rews, lu!!S a

Lightening

pressure'.

t(•rminlll block,

Wh<•n

Set

,obsCI:\'ed

wcaLher subj

Lhc

frayNI

SllpporLing

coim9ct10ns.

with a cloth

condition

b<'

ld

tum

mounting

body

nnc1 chipp

fo1·

loose

of

the

bC'twcon

cloth

potentiometer

for

<·rncks, brcn,kngc

l4e

moun

of

keyed

Nlsily

of

the potent

dust,

assembly

surfaces

whenever

Lho

parts

corroded,

arm

the

back

Lin()' scr·ew

JnC

scrc~v~

of

conecl

Tighten

nccl'ssary

solvent'

AN /

PRC

-1

L.

Cond

iLion

..

ects

cables

phtces tho

Clean

for

~racked.

o_r

cut

pomts,

watch

on

cables

corroded con-

pot<'nti-

ti~htly

in

to

the

nectors

smf1tce remove individual

78.

with

of

METERS

M<·tPrs

must

he

and

.

Inspect

nl<'ter.

Since

glnss

Ti

ghten

Any

clit·t

m·

(.rehniqu<·

cmck

with a dry

tho

dirty

handled

intcnn.nce.

its

ed

dirt,

by

arm

and

screws,

i-

placc•s.

and

or

of

!lw

they wit.h

clean

·

insert-

and

forth.

wilh

n

little mn.

mrnts

field

a.

of

the

C0Jli11'Ctions.

glass.

dl'licnle,

the through.

b.

Joose.

fOI'

Th

o Lightening

spp~·i11l

cnstly

c. Clean (C). l\Iet<'r

ch•nn<'d dnmp<·n Ci<'nn

in ch·y-cl<'aning solv<'nL pi<'ce of clot,h

d. Adjust

Set

AN/PRU-1( ) should

t.l

1n

0

size

when

and

( )

s:

cltauicttl

nd

be

. ' Do

loose

re-

usc

(SIJ).

then

arc

of

the

a

Opera.t~ng

cabhug

or

~1sulat10n

and

~a?l~~

ior

or

kmk

clamps,

when

s

(•quipmcnt

t.hn

.L I

lw

nwLPr

ease

lightly

help

Lhe

needle which Vt·nts

~·~·st

L1p slotLc·cl

an~

POIIIL<•r

n.gn

u.n

S<

t.he hn.

79.

for

d

(1) Tighten

any dirty

(2) Sc;mw loose

80.

01~ly

w11l ch•an

sometimes

an

otherwise

nt

zero.

of

lhe

!Wrcw hen.d

8/owly

is

in

and

d noL fr

·J·ew

too irspting

DIAL

a . Inspect

loose ln,mps, loose

.

u·L

y,

or corrod

b. Tighten

loo

s<'

or corr

JACKS

,JnC'k

s r

equire

at

infr

be

necessary

the conta

#0000 sandpop<'r.

the

conn<'ctor.

prongs

arc

extremdv

ordinarily

(1).

Inspect

Look

the

movemC'nt

accuracy

is

broken

(T).

Tightru

loose

meter

corrosion

of

Lhe

mci<'r cas<'.

cloth

with

connections

drlicn,to

can

:rully.

Tlwy

cnttnot

thr

for

loost',

for

cmckC'd

wiJJ

nnd d

win•s s

before

nrcter

becnt1se

<'nsc•s

cloth.

dt-y-<'INlning

with

coniH

(SD),

dipped

(A)

with

If

thinnest

Lurn the

n.t

zero.

view

om

fa1·

, b

damn.gcJ. ·

in

thr

.

Normully,

is

tnt'nN

nrPds

n·•tdjw;t.in

Lhc

tip

ol'

to

ovt•rcomc•

exists

n t lh<'

normnl

ndjustnwnt

so.:rc"

drivt•r

located

ltdjusting scr

Lightly

tho m ct

eiLher sidt1.

ecause

rr face n

Lhc nccdl

I oi

Clean

Mnkc

from

cnbl<'

Tht•y

111·e !)I'

be•

lNlds

dirtv,

01'

of

n tn<'ter

b<'

S<'riously

irl

nnd

st

ll

comweLions hould

th(',Y

•et

can•h-ss

cnn

Jf

clc>1ming

n,

smnll

01·

Aolv<'nt.

t.ht• nH

indien.te

l'.

Before

g,

one

fing<'l'.

t.hc

bNtrings

unit

ic;

needed,

nvnilnblc

bdow

Ln.p the

nd

Avoid

t' may

no

instruments

C'c

n•paircd nnd

broken

nrc

ions l'Ntuir(•s a

lrnndiin

soh·ent (SD).

with

'ter

Lap

slight

from

the

ew

point

LAMPS

(1).

lnspret

ed

conn<'C'lit'ns.

(T).

loose

connect

oded, clean them bofon) solde

lamp

AND

PLUG

very

equent

to Lighten

cts,

the dinl ln.mp assembli<'s

motmt.ilw

mounting scr ion

s.

s Lightly inLo

scn•ws, and

!"

ews

lf

the eolmcct.ions n.re

Lbo

S

liLLie

attention,

intervals.

or incr

ease

Occns

the

mounting

t,hc spring tensio

the

atte

plugs.

require

ision

connect

nnd

corroded

is

extrem<'

nffeclcd

wn

ter

he

inspected

LighLonod.

usually

is

difficult,

brnsh

u Rmall

in

zero

deciding

th

e meLI'r

This

fri

and

coming

inserL

into

meter

until

meter

er

turning

be

bent

nnd

resolder

ir

sockets

and

ionnlly

entire

mpt

n.nd

very

instru-

in

the

ions

cover

filter

found

g

GUn

be

dipped

Radio

when

will

ct.

ion

prc-

the

glass

the

cnsc

full

on

Lhe

or

loo

se

ring.

.

then

nut,

n.

to

lv

if

to

1

it

10

SECRET

,

I

Remove rcmoYe cor-rosion wit.h n piN·e followed

·

wlw11

<'fiC'h

connections intact.

telyphone type plugs, (Srgnal Corps stock

remove

tetrac

81.

The

of

fu

bric-C'o\

a.

tlH' ense

<'V<'ry dcllul. Check (he p!lnels, the

ancl

pn

.nel

b.

in,

ttir

c.

holl

82.

'l'hN;c nuxiliary

to

must rn.clio

a.

dirt

Ill'<' tight, and

proprrly.

b.

in

n<·c:ordnnc·<'

Yiously

83.

dirt

with n brush

by

n.

clean

neressnry. Tr·y the

adj

ustmcnt.

doth. Increa

Be sure to keep nil

To

No. 60

all trnccs

hloride. li'inish off with

CASE

Rn.dio Sc•(

with

(O

AND

ells<'

·c•

rpc[

Inspe

ct

t.

horoughly,

tlH

' zoro

:-;

for loose knobs, switclws,

Clean

(C).

a

('INl.ll

blow

OlJ(

Tighten

s.

pnlwl

HEADSET

t

II<'

op

prn.t.

then·forc

itself.

In

spect

11.11tl

cotTosion.

I

Clean

(C).

for·

r<

COUPLING

of

polish remaining with cnrhon

CHASSIS

whieh how

A~/l>HC-

plywood.

(1).

srlling

, allliC:C'U!11U)Il(C'cl

(T).

sc·

rcws, plugs,

AND

ion of

gin

(1).

Lhnl

nspect

•es

lns]wct

p11ying

of

Cle~tll

dry

dolb.

Tighten

KEY

i!.<llllS

Lito

Llwm

Inspc·cL all ext.crnnl surfaces for

Sc•c

plugs and jacks

Lh<'

Cknn a

with (.lw inst

•lnys, <'ords

SHAFTS

ancl

<"nrbon

se spring lensicm,

IL<:I.ion

clcnn dirt v or

usc•

pnsto · nwbtl polish

1516).

n.

the various

1(

) is constructed

Lhc1

outsidr

Rlr

icL

tho

mcLel'.

<'!l.c

h chassis, outside nnd

L'so

dirt

nil

loos

n.nd

c·cmt

of equipm

cat

rn.dio scl. Tile operator

tlw

~nmc

tbn.L

u.

ll

cable

kC'y

for

proper

ll

it,

nms

of

ruC'tions outlinC'd prc-

ja<·ks,

Pte.

AND

KNOBS

Th

e contr·ol of Yarious cllpncitor

resistors, found

t.hi'OughouL

s,

Llw

tcLmcLloridc ·

of crocus clotl;

of the jack n

fL

cr

soldc·r·C<

c·orrodl'<l

AfiN

donning,

clcnn

dry

cloUt.

<'OmpOIH'U(s

and insido of

nLtenLion to

pu

rwl

Inspect the

n.n.d

jneks.

dry

eompn•,-<wd

and

cJust..

(l

mounLing

rol

knobs.

!l.I'C'

<'

c·nrc

<'O

itncctions

fii

logrllwr

OJ>t·r~tl

Llw

Pq

uipu

of

srn'ws,

sscnt.inl

ns

th<•

ion.

wnL

CONTROL

swit('hcs, nnd

set

is t'il'cclcd

through <'Oupling shn.fls

Lo

control knobs

is important. be

kept

l

t.o loosr.

84.

!l.tldio Lmnsformers used in Hn.dio

tight.

tighten t.hcso it.oms

POWER

AND

AUD

Since powct· transformers,

located

that

1~L

all

TRANSFORMERS, FILTER

IO

t.h11t

<'Ormcct.

on the front panels. H

tlwse shn.fts

Limes

. Usc

wb<'llO\'<'l'

TRANSFORMERS

filter

( ) ltre of similar ronsLruclion,

trnnnce

clown, whic:h

·imminent fuilurc ot.lwr

1'4 for abno1·nml normnlly

for nbnorm1ll heating,

filter choko of blistering, bulging, compounds. Inspect for extemnl signs trolytic action

c.

seJ'('\\

st.

I'OYcd.

trn1isformcrs porLn.nL

heavy it

s niounLing in trn,nsil,

i:tble capaeitors, coils,

LimP

d.

choke a, Be

Lcrinl

and

n.

tt'rminals.

for them is similar.

a.

Feel

(F).

As soon as possible

feel

filler eboko

may

indic:ntc nn O\'crlon.ded concliLion, or

due

caus<'S.

Likt•wiRe feel audio t mnsfornw1·

heaLi

Op<'ml

cs

b.

Inspect

Tighten

'S

(1).

In

CH

n.nd

or

conosion.

(T).

'l'ight.cn all

, but not. t.o t.he point

The

securing of such heaYy

and

chokes to

in lH'('\'cnLivo maintt•mmcc. Should a

filter c·hokc

sever a l

Clean

(C).

nd

~u:·o

th1ll

is

prcsonL

t.hren.d

1<-n.kagc

pn

ot·

a.rge

Clcnn pow

nudio trn.nsformcr w1th

no dirt, lint.,

beLw<:rn

n bsorb mo1st.uro w

.th

for high-Yoltng<•s bet

Be>

sure I

CH

for n.bnormal

to

moisture absorption

ng. Power

aL

n warm tmnpomture. Feel

buL

usc

<·nrc

spect, p0\\'

audio transformer

or

lenkagt•

<'1'

of

mounLing bolts

LlmL

tlw

chassis

LmnsfonnN· break loose from

it.

miLY

smash lubt>s, 'll!'-

and

r<'sislors, :trtd

number

of connecLwns.

er

Lr~nsfornlt·t

Lill·t·a~ls,

tcrmJ~tals.

lll

hnL

none nrc pn'sc'nt..

Lhesc

item

11nd

control

tho

All

t.hey nrc found

en

wrenches

knobs

CHOKES,

<'hokes,

SoL

AN/PRC

})!'O\'CilLh'e main-

n.ftet·

Lrattsformer

to tn·oid bul'lls.

transformer

'1'4

tar

or

Lhrc:tds

is

:~

dry

or

fo1·~·ign

Du'L, h!tl

ch

may

W<'l'll

hc1tl

for

ins

ulating

of

ar<'

parts

\'CIT

at

·

,

doLh.

prov1d<·

f.lH'sc•

nncl

shuL-

'['5

s

ign~

cl<'c-

im

the

fill

':1111.-

s

1

ing

or

T5

or

d<'-

1ts

-

<'I'

.,

SECRET

11

APPENDIX

II

(Added)

ITEMIZED

85.

INTR

ODUCTION

li'ot·

<'llSC

and

efficit'ncy of pC'rforrnnnce, preven-

tive

maintrnance

will

be

pcrforrnrd u.ppC'ndix p<'rfornwd

intl't·vnls is itc•ms. application forming pnrLs instructions \Yhen appendix following

with

After on opcratron

ance.

86.

broken

the

The

prcv<'ntive_

arr

discussed m appcnc!Jx

performing

J if

items.

tho

powol'

p1·evontive

a

g~ven

day,

and

(Sec

PREVENTI

at on

broken

of

par.

MATERIALS

Tl~c

for·mmg preventiVe mnmtC'nnnco:

following.

Common

Ol

onn

#0000

Crocus Contacli

Drv-clcnning

Paste

6G1516).

Camcl's-hair Allen

wrench

NOTE:

any

for

as

a

Oil,

dry-cleaning tetrachloride

following cases:

used because of the fire hazard, ami

conlac~

Gasoline

purpose.

clcaniug

Fuel, Diesel,

fluid

solvent

will

including relay contacts, plua.;s, commutators, etc.

on

Hadio

down

difl'rrrnt

preventive

general

arc

more

VE

cloth.

sandpaper

cloth.

metal

~ay

be used

where

into oporntions

the

rn.dio

down

t<'clmiq

the

FITCAL

mnintrn~ncc

not

rcpC'ntcd m

preventive

information

All work is

removed

maintrnnncc

the cquiJ?m

checked for Slttlsfitciory perform-

37.2.)

MAINTENANCE

matC'r_inls

hand

tools.

burnishing

solvent

polish (Signal Corps stock No.

brush. .

will

noL

Dry-cleaning

through

be usect_fo•· clcnnrng

(SD)

as a clcamng

inOammnblc

Srt

Li

mo

maintm1n.nce

set

into

units of

urs

from

cnt

will

.

tool.

(SO).

be used

sol

.vent

establlshcc! s

1s

noL. at, h.nnd.

PREVENTIVE

87.

ITEM PRC-1

AN/

PRO

- I ( )

that

in tcrvn.ls. In this

11.t

spC'c

involvrd

operaf,ions in

~1.1

f.

I

this

maintenance, sec

is

required for

Lo

be

tho equipment.

hil

S

been perfo

~hou

ld

TOOLS

be

needed

as

a

(SD) IS

upply

Otlld

~oh·cnt~

fo1·

clcamng electncal

cnn

work to

ifiPd time

work

called

and

the

per

individual

hC'sP

general

appendix.

put.

the

rmed

into

performed

be

AND

in

per-

clc~ning

purposes

avmlable cl'k'mncls.

q1u

only

cannot.

.fluid

'~hen

bon

m the

be be

-

be

OPJCH.ATIONS:

REMARKS:

all

loo~l'

88. ITEM

OPERATIONS:

89. ITEM

OPgRATIONS:

REi\IARKR: Clenn L

to

the

90.

ITEM

PRC

PRELlMINARYSTEPS:

transmiLtot

OPERATIONS:

MAINTENANCE

1,

EXTERIOR

( )

1'1'()

Cn!:le

and

no

Jacks.

IT

Diallights.

IT

Control

IC

Meter

.

controllmobs.

J C Cables

]

TO

mC'thod prC'scribcd for I'IPnning

With

2,

CABLES

and

3,

HEADSET

Cords

4,

and

RECEIVER-TRANSMITTER

-1

n11it

from

ITO JC I'l'C ITO IC ITO IC JT lTC ITCA

JT

IC ITC

Tubes Power Capacitors.

RcsisLors.

Fuse.

Relay

Switches.

O Coils.

Po

tentiomol.<•r.

Metrr

Diallamp

Jacks.

Terminal

OF

chass

is.

knobs.

an

Allen \\Trnch,

COJmoc

l,ions.

AND

plu~s.

lw

lwy

tho

cnso.

and

soekcts.

receptacle.

.

s.

bloc·k.

RADIO

KEY

C'Onllwts

R<•movc

rdn

RT-30( )/

Lhorccoivcl·-

SET

AN/

tighten

ncC"or<ling

.ys.

12

SECRET

91.

ITEM

( )/

PR

power

OPERATION

PRC

ELIMl

uniL

1

TO

5,

10

lT

O Cttpncit,ors.

ITO

IO IO IT

O Cords and

l!'ITO

RECTIFIER

-1

NARY

from

t.lw

~:

Tube

Pow<'l'

}{.1•sistors.

F11sP.

Switches.

Trnn

ST8PS

Cll!;P.

and

socket.

POWER

: Remove

UNIT

plug.

en.hles.

sformer nnd choke.

Lhe

PP-36-

rectifier

92.

Operstious

0

7.

E

~

1

2

3

4

5

PRE

JTC---

IC-----

JTC

...

lTCA

FITC

VENTIVE

I

-

Exl<'rior

Set.

1(

Cnblrs

Heads Recc

..

mi~ter

/PRC-1.

Rectifier Power

..

pp

l.

MAINTENANCE

Items

--

of Radio

AN/PRC-

).

_____

et.

and key

i v cr-Trans-

RT-30(

30(

)/PRC-

••••

Unit.

--- ---

)

"'

.2

-e

~

0

~

..

1%1

-

-.

--

CHECK

When

"'

.2

e

x

0

~

<

-

---

X

.

t>crlomHld

I

I»

:;;;

>-

.,

:;;

"'

?;

A

--

X

---

X

---

X

--

:c

~

1-

--

>-

c

0

LIST

0

"'

-.;

il

""

--

1st.

1st. 1st.

2d

.

2d

.

NOTE:

pe

rformed.

"X"

indi

cat.es

when operations are

F I T 0 A L*

Feel

Inspect TighLen Clean Adjust

''l'bo

Lubricate opcrotion

Is

not oppliroblo to

Radio

Lubricate

Set

AN/PRC-

to

be

1 ( ).

SECRET

13

APPENDIX

Ill

(Added)

COLOR

CODES

14

SECRET

RES\SlOR

COlOR

RMA

COLOR

FIXED

COMPOSITION

CODES

CODE

FOR

RESISTORS

J

AWS

FIXED

COMPOSITION

COLOR

CODE FOR

RESISTORS

·

SIGNIFICANT

FIRST

IBOOYI

FIRST

SIGNIFICANT

In

sulated fixed composition t•esistors with nxial

leads

a1·e color. Non-insulated axial le colot·.

COLOR

BLACK BROWN RED ORANGE YEllOW GREEN BL

UE VIOLET GRAY WHITE GOLD SILVER

NO

COLOR

desi~natcd

ads

SIGNIFICANT

SEC:~

'~~l'

arr. designated by a

FIGV!!ES

by a natural

fixed composition rcsistot>: with

FIGURE

0

1

2

3

4 10,000

5

6

7

8 100,000,000

9 1,000,

FIGURES

SECOND

MULTIPLIER

blacl<

MULTIPLIER

1

10

100

1000

100

,00

1,000,

000

10,000

,000

000,000

0.1

O.ol

ITIPI

TC?LERANCE

tan

background

·background

T()LERANCE

I

IPE

0

RCENTI

5

10

20

Figure 91.

TOLERANCE

.

The

exterior body color of insulated resistors may

be

any

cp.J~n·

e~ccpt

black.

The tan. The exten with axial leads

exterior body color 1·adial leads may be black

the

.fi1·st

~························

~

f

l

.........

or

body color

may

be

of

sign

ifi

cant

figure of

RMA:

Radio

111anu{actw·ers

AWS:

American

~~:~~~:~~~~~::~.~~~~~~~

usual color

of

uninsulated resistors

either

black'

uninsulated resistors

or

it

may

the

· resistance valut\

..

War

Standard i

is

natural

or

white.

the

colo~;

with

be

··············1

Association :

TLI3416

Tl'le

of

..

~J

SE

CRET

15

RMA

6-DOT

MICA-DIELECTRIC

FIRST

COLOR

SIGNIFICANT FIGURES

SECOND

CODE

CAPACITORS

.

THIRD

FOR

VOLTAGE

RATING

RMA

3-DOT

MICA-DIELECTRIC

SIGNIFICANT

FIRST

Capac

itors

of

so'o

rating

~~~Y~~.ed

r

COLOR

~ACK

~~==~==~====i=====

~ROWN

REO

~

YELLOW G

SIGNIFICANT

FIGURE

-1-

4

O

1

COLOR

FIGURES

SECOND

with

T

CODE

CAPACIT6~R

MULTIPLIER

this

code

have a voltage

RMA

MICA-

CERAMIC-DIELECTRIC

PAPER-DIELEC

===

A=W=S~M~IC~A~-~A~N~D==

1

10

1000

MULTIPLIER

AND

TRIC DI

mum operat"

====

AWS 6-DOT

PAPER-DIELECTRI

THESE

ARE

SILVER

OPERATING

TEMPERATURE

RANGE

.

Tlw

silver

W<lh

clot

shows.

1850F

(brow'~1)

~==A~W:S~CE:R:A:M~IC

ELECTRIC

1

00

1000

CAPACITANCE

TOLERANCE

COL

COCR

DOTS

ALWAYS

clots

. .

~~~rvlcllo

. e

g.

temperature

rdenlify this mnrl<in 1'h

1et·

the

I I

-

VOLTAGE

tVOLTSI

~-

-t~R~ATI~:NG~_J

200

MULTIPLIER

CODE

APACI

capac·r·.

of

FOR

TORS

MULTIPLIER

J

'·

g. e

!•

(black)

1

G7~' ~

hiS

DIELECTRIC!

lAWS

--

C~HA:R~A:C~TE:R:IS~T~IC.

--

a maxi-

MICA

A

8

c

D

E

F

G

or

-

TLI3417·t

-

SECRET

A

WS

6-DOT COlOR

MICA-

THIS

DOT

IS

ALWAYS

BLACK

DIELECTRIC

CODE

FOR

CAPACITORS

A

WS

COLOR

CODE

CERAMIC-DIELECTR

SIGNIFICANT

FIRST

FIGURES

SECOND

FOR

TUBULAR

IC

CAPACITORS

CHARACTERISTIC

The' black CapnC'itors marked volts, except tors

micrornicrofnrads, and A WS type CM 10 capacitors with farad

,

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

dot

with capacitances

s are t·ated

the

capacitanc-es

st'rves

to

irfpntify the A

with this code are rated

following.

of

at

300 volt

AWS

of

6,800. 7,500, and B.200

9,100 a

nd

s.

_..,..,

.........

,..

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

MULTIPLI

I:R

WS

marlking.

at

,

.....

500

type ClVn5 capaci-

10,000 micromicro-

.,

t : t

RMA:

• 4

~

Radio lllmwfcrrturcrs Association :

AWS:

Auu

?riNm

Wor

Slolldm·<i l

f ( 1\ nwncmr Stanclards Association) i

t :

f

NOTE:

Tht>se

color

codes

give

all

• anccs

l 4 A

RMA & AWS

MICA-

in

micromicrofarads. :

AAAAAAAA44A444444AAAAA44444444444A44AAA1

AND

PAPER-

DI

ELECTRIC

IPERCENTI

CAPACITANCE

RMA

CERAMIC-

DI

ElECTRIC

IPERCENTI

caoacit- 4

TOLI:RANCE

AWS

DIElECTRIC

THAN

IPERCENTJ

t'aling

·

rating

CERAMIC-

GREATER

10

MMF

FIRST

SIGNIFICANT

Capacitors marked

of

500 volts.

RMA

COl

OR

CERAMIC-D

CAPACITANCE

T

OLERANC

~

Capacitors

of

E

!

TEMPERATURE

COEFFICIENT

marked

500 volts.

AWS

CERAMIC-

DIElECTRIC

THAN

IMMFI

SECOND.

FIGURES

with

this

code have a voltage

CODE FOR TUBUlAR

IELECTRIC

)

with

LESS

10

MMF

CAPACITORS

SIGNIFICANT

FIRST

tl

this code ha\'e a \'Oltage

FIGURES

SECOND

~I==:;:J

MULTIPLIER

TEMPERATURE

COEFFICIENT

CAPACITANCE

x10

-•

THIRD

OF

MMF/MMF/°C

.

SECRET

10

20

8

9

5

+

Not

0 30 80

150 220 330 470 750

30

spe<ified

TLI3417-2

20

1

2

3 4

5

6

7

6

7

2.5 10

1

2

3 4

5

..

20

1

2

.5

5

10

Figure !8.

2.0

0.25

0.5

1.0

17

[AG

BY

300.7~5

Jun

ORDEn

45)]

OF

'l'HE

SECRETARY

OF

WAn:

OFFICIAL:

EDWARD

.Major

Acting Tlte

DIS'l'RIB

U'l'ION

A.Al•'

(2);

SOS

(2);

Refer

F.

General

Adjutant

:

(5);

AGF

Arm & Sv

Dcp

(2);

T/0

&

Lo

I~

FM

WITSELL

General

(5);

ASF

(2); T of

Bd

(1);

S

P1·o

Dist

ll

- 107 (3)

21 6 for cxp

Div

ASF

11

(2);

i.

11-~27

anatwn

Opn

(5);

(1);

Tech

Gcn & Sp

(3);

~1-!587

of

d1sLnbuLIOn

Dept

Sv

.(3);

(5);

Base

(2); PC&S

Sch

(5);

11

- 592 (3);

formula.

Comd (S);

(l);

Lab

11

pg

(2);

11

597 (3).

G. C.

C'hiej

of

Island

(2);

Comd

Dcp

Rep Shop

MARSHALL

Staff

(5);

Def

11

(2);

Gen

11

(2);

A (5);

Comd

Oversea

CHQ

18

U,

S.

OOYfRNNINT

!IIUNTINO

SECRET

Orti(EIIUS

,

. -

__.

Military Surplus rigs AN-PRC-1 Service guide

Specifications and Main Features

Frequently Asked Questions

User Manual