Hammarlund SP-600-JX User guide

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AN

16-45-221

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/

HANDBOOK

OPERATING INSTRUCTIONS

RADIO

MODEL

(HAMMARlUND MFG.)

RECEIVER

SP-600-JX

-------:,-

0-23

JUl523,200

PUBLISHED

UNDER

-------.,.

AUTHORITYOFTHE

*-------------~

SECRETARYOFTHE

AIR

FORCE

27

JUNE

1952

Reproduction
cation
The
and

is
policy
for

the

not

for

permitted

for

use

Navy

AN

16-45-22'1

non-military

without

of

Classified Publicationsisestablished

in

Navy

use

of

the

specific approval

Regulations,

information

Article

or illustrations c

of

the issuing serv

1509.

for

the

Air

F

;r--------------L1ST

NOTE:

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portionofthe

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LATEST

text

affected by the current

OF

REVISED

REVISED PAGES. DESTROY

PAGES

revision

is indicated by a vertical

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SUPERSEDED

PAGES.

lineinthe

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:1:

The

asterisk

USAF

ACTIVITIES.--In

NAVAL

tions

supply
Calif;
For

listingofavailable

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ACTIVITIES.-Use

point

Seattle,

listed

NAS.

accordance

below:

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COPIES OF THIS PUBLICATION

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Index

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San

publica·

Diego.

A

AN

16-45-221

Section

II

GENERAL

I-

1­1-11.

1-16.

OPERATING
2-

2­2-

2­2­2-

2-

2-

2-

2-10.

2-11.

2-12.

2-13.
2-14.

General

I.

6.

Desc
Operational
Capabilities

SequenceofOperation.

1.

2.

PriortoUse
MCW

3.
orTelegraph

4.

Preliminary

5.

Tuning

6.

Adjustments
Conditions
Adjustments

7.
Weak

8.

Crystal
Unit

9.

Suppressed
CW
Preliminary
Tuning
Adjustments
Conditions
Adjustments
Signal

DESCRIPTION

ription

Operation

Reception--Telegraph

Theory

and

Limitations

PROCEDURES

Reception--Voice,

Signal

.

Requirements.

Procedure.

Under
Suitable

Frequency

Carrier

Requirements.

Procedure.

Under
Suitable

Noisy

Control

Reception

Noisy

to a

to a Weak

TABLE

Music,

Page

OF

CONTENTS

1
1
1
3

5
5

5
5
5

5
6
6

6
6
6
7

7
7

...

Section

III

IV

Page

2-15.
2-16.

2-17.
2-19.
2-41.
2-42.
2-43.
2-46.

OPERATING CHECKS AND ADJUSTMENTS
3-

3-

3-

3­EMERGENCY

4­4­4­4­4­4­4-10.
4-12.
4-13.

Crystal
Unit
During
Following
DescriptionofControls
Presentations
Tuning
Meter
Precautionstobe

General

1.
PriortoOperation

3.

4.

During
Precautionstobe

5.

Other

1.

Antenna

2.
Electron

3.
Replacement

4.
Pilot

5.
Electron

6.
Crystals.
3-amp
3/8-amp

Frequency

Operation

Use.

Use

Presentation.

Readings.

Operation

OPERATION

Than

Normal

System.

Tube

Lamps

Tubes.

Fuse

Fuse

Control

and

Readings

Observed

.

Observed

AND

Operation

Complement

or

Repair

REPAIR

7

B
B

8
11
11
11
11

12
12
12
12

12
12
12
12
12
13
14

14

14

Figure

1-1
1-2

Radio

Receiver,

JX

Rack
Radio
Identification

Mountings

Receiver,

Model
Front

. . . . . . . .

SP-600-

.....

Panel

Table

2-1
4-1

Decibel
Chart
Operation

LIST

OF

ILLUSTRATIONS

Page

ii

2

LISTOFTABLES

Conversion

for

Other

Than

Figure

Chart

Normal

1-3
2-1

2-2

Radio

Receiver,

Identification

Operating

Radio

Receiver,

.

Rear

. . . . . . .

Data

Form

Top

Page

11
13

Apron

. . .

View of

Chassis

Page

4

8

10

Section

AN

I

16-45-221

Figure

ii

1-1.

Radio

Receiver,

Model

SP-600-JX

Rack

Mountings

1-1.

GENERAL.

1-2.

Radio

Receiver,

ings

(See

figure

1-1.),ismanufacturedbythe

lund

Manufacturing
receiverisa
designed
relay
front

1-3.

for

rack.

panel,atop

The

receiver

It

Co.
20-tube
direct

mounting

comprisesachassis

cover,

hasaself-contained
designedtooperate
volt,

50-to60-cps,
former
fused,
in a
voltage
type
11
ceiver

fuse

fuse

and

primary

the

holder

secondary

soldered

chassis

and

primary

locatedohthe

ground.

by a

by a

between

mustberemovedtogetatthe

Maintain

the

fuse

age.

1-4.

To
are

associated

provide

with

for

the
compriseaheadset
quency
teleprinter
used
quire
antenna
top
"PHONES"
front
connecting
figure
outlet
clock
a
suitedtooperate

1-5.
plitude
rier
frequency
may
1-2.),
speaker
(See 3,

shift

or

with

the

the

useofan

input

rear

of

jack

panel,

means
1-3.).
(See 1,

and a "PHONO"

record

The

player

receiver

-modulated,

intelligence

or

be

pluggedinthe

contained

connectedtothe

figure

receiver

tape

recording

receiver.

antenna

connector

the

receiver

(See 1,

all

the

are

The

rear

figure

attachment,

from

provides

keyed,

signals.

low-speed

in

1-3.),
stanceofteleprinter
a

teleprinter

the

received
keyed
transmission
terminals,
ceived

oratape

signal

carrier

line

with

signalisa

signal,

connectedtothe

the

speaker

frequency-shift

Model

SP-600-JX

Inc.,

radio

communications

New

in a

rack

York,

standard

with a

and a

bottom

plate.

power
fromasingle
a-c

source.

secondary

three

three-eighths

the

The

phase,

The

are

each

ampere

rear

apron

transformer

bottom

power

fuse

ampere

plateofthe

pigtail

CAUTION

complementtoprevent

reception,

radio

and/or

converter

auxiliary

receiver.

a loud

These

speaker,

equipment

equipment

All

operational

activities

whichisconnectedtothe

(See 11,

chassis.

figure

receiver

locatedonthe

apron

1-3.),

inlet
the

available

telegraph

"PHONES"

the

front

"AUDIO

on

the

or

high-speed

recorder

is

an

the

figure

1-3.),at

Apart

1-2.),

containedinthe

auxiliary

rear

also

for

(See 2,

for
and
In

containsan"AC"

an

electric
figure

all

of which

a-c

source.

the

receptionofam-

frequency-shift

the

instanceofvoice

signals,aheadset

jack

(See 1,

panel

and/oraloud

OUTPUT"terminals

rear

apron.

telegraph

mustbeused.
amplitude-modulated
recording

equipment

"AUDIO

removed.

When

carrier

AN

16-45-221

SECTION I

GENERAL DESCRIPTION

"IF

OUTPUT"

on

the

mount-

Hammar-

N.

Y.

receiver

The

frequency-shift
versity
ceivers,
stem

19-inch

light

grey

1-6.
1-7.

supply

90to270

trans-

separately

contained

and

the

pigtail

terminal

type

high

re-

fuse.

erodyne
within
frequencies
frequency,
vertedto3,955kcthroughasystemofdouble
heterodyne
continuously
carried
controlled

1-8.
in

the

against

dam-

strength
gainisadjusted
row

components

usually

but

fre-

and/or

may

also

re-

the

from

the

be

volume
presenceofacoustical
ally
reception.

1-9.
of

acceptance
tuned
vides
qualityofthe

component

apron

(See

nals
strength.Anoise
tion

lamp

1-3.),

must

or

for

be

output.
1-10.

desired
uredinrelation
volt.

car-

to

the

­1-11.

figure

1-12.
vide

In

the

in-

signals,

When

or

OUTPUT"

the

re-

signal

the

is

mc

frequency

for

each

is

usedtochange
coil
their
tuning
high
train,

cable

rear

receiving

each

through

apronisconnected

receiver

meansofits

connector

receiver

systems

converter

is

DESCRIPTION.
The

radio

reception

its

0.54to54.0
are

but

conversion.

Qut

receiver

converted

those

variable
at

any

provides

of any

mc

above

The

tuning,

pre-determilled,

frequency.

The

receiver

presence

the

of any

maybedesensitized

of a

strong

wide

variations

carrier

picked uportuned

manually

limits

through

control

use

incorporated

noise,

adjustedtoprovide

The

receiver

band

in,

the

band

optimum

receiver

signal.

may

be

phased

for

prOVides a

widthorselectivitytothe

width

chosen
performance

Also,

out

limiter

noise,

The

carrier

and

similar

receiver

and

pulse

may

the

strengthofthe

toacarrier

The

audio output

standard

reference

may

outputofsix
OPERATIONAL THEORY.
The

six

frequency

for

the

continuous

band

range.

are

coverageofthe

The

contained

bands.

assemblies

respective

condenser

signaltonoise

used

for

for

sections

assures

tuning

each

ratios.

provides

Paragraphs

(See 4,

by

figure

coaxial

1-1to1-12

cable

equipment.Indi-

involving twoormore

Section

cable

connectedtothe

"IF

OUTPUT"

radio

tuning

to

a 455 kc

7.4
receiver

or,

range.

mc

connector.

for

the

frequency

All

intermediate

are

initially

prOVides

operations

superhet

fixed,

for

local

carTier.

protection

To

encountered

in,

and

maintained

ofasystem

in

the

the

audio

comfortable,

within

of

automatic

receiver.

gainismanu-

intelligible

choiceofsix

being

that

which

for

interfering

to

highly

effectively

noise,

be

accurately

the

unwanted

attenuate

eliminates

from

the

tunedtothe

carrier

intensity

be

measuredinrelation

of one

milliwatts.

bandsofthe

receiver

0.54to54.0

four

r-f

coil

in a

The

band

of

receiver

An

rotary

manner

are

the

precise

anti-backlash

for

calibration

assemblies
turret
in which the

placed

sensitivities

adjacent

four-gang

1-3.),

re­sy-

carrier
carrier

con-

super-

for

may

be

crystal

prOVide

in

the

the

r-f

nar-

In

the

degrees

carrier

pro-

existing

sig­their
igni-

audio

meas-

micro-

pro-

which

gear-

accur-

I

to

-

to
at

1

Section

I

AN

16-45-221

1.

"PHONES"

2.

"SEND"

3.

"XTALS"

4.

"LIMITER"

5.

"SELECTIVITY"

6. "A

7.

8.

9.

10.

11.

12.

13.

2

VC"

"AUDIO GAIN"

"RF

"TUNING LOCK"
"BAND CHANGE"
"MEGACYCLES"
"TUNING"
"BEAT

"REC"

"MAN"

GAIN"

OSC"

Figure

jack

control

"OFF"

control

control

control

toggle

toggle

switch

toggle

control

control

control

window

1-2.

switch

switch

Radio

switch

Receiver,

14. "MOD" "cw"

15.

"6.

.

FREQ"

16.

17.

18.

19.

20.

21.

22.

23.

24.

25.

Front

"XTAL
Vernier
Main
"METER"
Meter

"FREQ

Movable
Fixed
Vernier
Plastic

Panel

PHASING"

dial

tuning

"RF"

CONTROL"

pointer

pointer

pointer

chart

Identification

toggle

COI1trol

dial

control

"AF"

switch

toggle

switch

acy

and

completely
abling
stal
the

1-13.
edinthe
stability,
attainable

maximum

filter

receiver.

The

receiver

circuit

being

for

establishes

receiving

a

time

1-14.
dyne

range,

ally

conditions

consuming
The

reception

the

that

developedinthe
useof3,955
high

"image"

benefittobe

crystal

superior

variable

the

communication

receiver

for

overall

kc,

rejection

accurate

resetability,

derived

incorporatedinthe

frequency

resultsinthe

control

to

the

frequency

ultimateinfrequency

practical
tuning.
channel,

are

poor,

without

searchbythe

makes

any

receiver

for

double

ratios

full

signal

selectivity

455 kc

conversion,

above

operator.

useofsuperhetero­within

i-f

further

from

i-f

amplifier

unit

incorporat-

Its

necessitating

its

being

amplifier.

7.4

mc.

AN

the

cry-

precision

use

pre-

even

when

frequency

essenti-

The

maintains

16-45-221

en-

of

ed

frequency,

any

frequency

The

receiver

for

continuous

crystal
within the tuning

is

variable
ationbyturning
1-2.),from
positions
each

of whichisassociated
holder
crystal
dered

crystal

its

designated

locatedatthe top

holder

whose
frequencyofthe
In

ordering,

stal

is
ordered
crystal
for

the
eration
retuning

the

intended,

crystals

holders

same

signal

as

on

of the

Paragraphs

controlled

channel

rangeofthe

switched

from

a condition prOViding

tuningtofixed

the "XTALS"

"YFO"

positiontoone

"1",

control

"2",

"3", "4", "5",or"6",

with a

front

chosenisfitted

frequency

pre-determined

signal

must

may

frequency,
be

be

provided.

frequency

variable

frequency

of the

with a

specification

operational

specified.

usedinanyone

When

the

on fixed

receiverisdesirable.

Section

1-13to1-23

operation

receiver.

frequency

(See 3,

numbered

receiver.

separately

oper-

figure

of

its

other

crystal

The

or-

suits

the

activity.

for

which the

cry-

Anyoneofthe

of

the

six

receiverisused

frequency

op-

operationaslight

I

at

1-15.
vides
high
in
or
to
the
selectivity
for
become
shift

put.
controllable
contained
supply
voltages
frequency

1-16.

1-17.

performance
It

jecttowide

sequenttoa
stability
corporates

its
This
multi-receiver
board

essary

and

cidal

1-18.
tional

switch
tion

sitizes

receiver

the

receptacle

The

r-f

for

intensity

this

double

the

i-f

receiver

partofthe

signal

any

signal

levelinrelationtothe

converted,
sectionofthe

develops

at

the

amplitude-modulated

available

carrier

The

signalstobecome

a-f

section

audio output of

power

voltages

being

supply

usedbythe

regulatedtomaintain

stability.
CAPABILITIES AND LIMITATIONS.
The

radio

receiver

when

maybeused

in fixed

rangesintemperature

15-minute

closely

approaches

advanced

radiation

enables

characteristics
the

receivertomaintain

installations

regulations.

chassis

shock.

It

rigidity

is

varnishtoconditionitfor

The

receiverisadaptabletoa

activity.

(See 2,

when in

the

power

figure

the

receiver

remaining

The
"REC"

switch.Arelay

(See 5,

crophonetoperform
1-19.

edinthe

The

receiver

crystal

section

tunedinto

of

the

become

noise

receiver.

always

proper

as

audio output

The

providing

receiver.

the

i-f

signaltothe

amplification.

or

keyed

signalisthen

The

carrier

and

availableasi-f

provides

develops

the

the

a-f

receiver.

all

receiver,

provides

properly

and/or

optimum

installed

mobile

and

warmupperiod

that

design

of a

and

shieldingtoreduce

toapossible

andtocomply

The

also

receiver

to

withstand

adequately

embodies

severe

treated

tropical

manual

1-2.),

when in

prOVides

position

the

"on"

"SEND"

and
"SEND"
for

both

maybeconnectedtothe

figure

the

switch

frequency

provides

1-3.),

to

enable

function.

control

for

pre-determined,

unit

receiver

availableata

originating

455 kc

i-f

i-f

section

desired

It

provides

signals

for

frequency-

signalasthe

The

the

d-c

and

someofthe

sensitivity

receiver

and

operated.

operations

humidity.

its

frequency

crystal.

minimum.

performance

with

the

vibration

with

use.

two-way

opera-

"REC"

normal

instantly

recep­desen-

posiEon,

positions

"RELAY"

a hand

incorporat-

pro-

single

input

to

out-

self-

a-c
d-c
and

sub­Sub-

It

in-

ship-

nec-

fungi-

toggle

the

mi-

fix-

of

in

of

1-20.
toabalanced
transmission

relative
tenna.
vides
atmospheric
tenna
antenna

The

inputtothe

doublet
line

locationsofthe

A doublet

good

signaltonoise

and ignition

when

usedisconnectedtoone

input

connector

grounded.

1-21.
other
toggle
its
the
tains

its
ter.

in
background
uum

The

receiver

pulse

type

switch

(See 4,
"LIMITER"
audio outputofthe

a 10toone

output

for

sensitivitiesoftwo

This

the

provides

presence

"hiss"

tube

and

prior

reception.

1-22.
figure
three

ranging
the

of
cies,
the

receiver.

restrict

"NON-XTAL"

8.0,

1-23.
by

2.).

mains

The

receiver

1-2.),

providesachoiceofthree

"NON-XTAL"

from

switch

the

the

extent

pulse

"SHARP"to"BROAD",asindicated

dial.

type,

noise

of the

The

the

pass

positions

or

13.0

kc.

The

the

receiver

"AYC" "MAN" toggle

In the "AYC"

constant
putisincreased
use

of avc

precludes
throughacarrier
settingofthe
1-2.),
ing

apart

from

characteristics

receiver

antenna,

used

prOViding

receiver

antennaispreferred

ratioslnthe

noise.Astraight

whose

shielding

noise.

figure

The

minimizes

noise

1-2.),

positiontoby-pass

receiver.

signal-plus-noise

for

optimum

of a weak

noise

circuitry

signal

originatinginthe

does

"SELECTIVITY"

positionsofreceiver

Since

noise,nomatter

wherebyitcomprises

tuned

in with the

overall

selectivity

bandto0.2,

acceptance

switch

0.5or1. 3kcwhile the

restrict

avc

systemisrendered

switch

position

within a 1:4

from

twoto200,000

the

voltage

an audible

relatively

"AUDIO GAIN"

strong

control

compensating

of

the

signal

provides

the

for

100-ohm

flexibilityasto

and

the

doublet

sinceitpro-

presence

terminalofthe

other

terminalisthen

ignition
"LIMITER"
maybeswitched

such

noise

The

receiver

to

noise

microvolts,

receiver

performance

tunedinsince

first

not

interfere

switch

"XTAL"

selectivity,

its

origin,

all

signalispassed,

bandwidthofthe

"XTAL"

the

pass

bandto3.0,

(See 6,

receiver

ratio

output

when

microvolts.

blast

when tuning

comparedtothe

(See 7,

for

the

possible

over

longorshort

coupling

matching

the

an-

wire

an-

and

"OFF"

from

main-

ratio

or

bet-

the

vac-

with

(See 5,

and

frequen-

positions

operative

figure

re-

the

in-

The

figure

fad-

of

to

at

on

is

to

1-

3

Section

I

AN

16-45-221

1.

"AC"

outlet

2.

"PHONO"

3. "AUDIO

4.

"IF

5.

"RELAY"

Figure

4

inlet

OUTPUT"

OUTPUT"

receptacle

1-3.

connector

11.

Radio

terminals

Antenna

Receiver,

Input

Rear

6.

"BFO

7.

"METER

8.

"METER

9.

"SPARE

10.

"FUSE"

Connector

Apron

INJ"

control
ADJ
ADJ

FUSE"

holder

Identification

RF"
AF"

holder

AN

16-45-221

Section

I-II

intervalsoftime.

1-24.
putisapproximately
control
service

"AUDIO GAIN"

The

(See

requires

receiver

7,

figure

control

maximum

two

this
what.
1-25.

.

typeofreceiveracarrier
plicable
sired

to

Since

the

radio

i-f

frequency

carrier

the

455 kcor3,955kci-f

frequency

higherinfrequency

CAUTION

In

an

emergency
pulling
the

2-1.
2-2.

erating
erational

the

a-c

power

SEQUENCE

PRIORTOUSE.

controls

activity
linedtooperate
control
figure

2-3.

and

switch

1-2.).

MCW

RECEPTION--VOICE,

turn

receiver

source.

OF

OPERATION.

The

and

switches

contemplated.

the

receiver

by

its

GRAPH.

2-4.

PRELIMINARY REQUIREMENTS.

a.

Pluginthe

fi~ure

1-

b.

Switch

2. ),orlistentothe

headsetinthe

the

"SEND"

"REC".

c.

Unclamp

counter-c

d.

Turn

"OFF"

knob
"click"
position.
the

receiver.

e.

Switch

"NON-XTAL"

f.

Switch

lockwise.

the

will

indicate

Do

the

the

the

"TUNING LOCK" (9)

"RF

GAIN"

position

that

thisatleast

Note

that

"SE

LECTIVITY"

"3"

kc knob

"MOD"

"MOD".

g.

Switch

the

"AVC"

"AVC".

h.

Set

the

knob

i.

to

j.

k.

its

dial

position.

Switch

the

"VFO"

Determine

Indent

the

"XTAL

PHASING"

frequency

position.

the

signal

"BAND CHANGE"

undistorted

watts

with

1-2.),

full

the

on. No

amountofoutput

is

always

receiver

backed-up

isasuperheterodyne

frequency,

tuned

in,isalso

frequency

the

equipment

power

radio

cord

receiver

adjustedtosuit

The

procedures

identify

front

pane

1

desi~nation

MUSIC,orTELE-

"PHONES"

loud

speaker,

"REC"

control

toggle

(8)

inaclockwise

the

receiver
15
pilot

minutes

lamps

the

switch

dial

position.

"CW"

toggle

"MAN"

toggle

control

control

"XTALS"

frequencytobe

control

spectively
mc.

power

out-

"AUDIO GAIN"

class

of

so

that

the

some-

ceiver
strength
the
voltstoproduce
other
frequency
the
puttothe

twice

the

than

the

converted

applicable

ap­de-

re-

to
at

rejection

SECTION II

OPERATING PROCEDURES

"MEGACYCLES"
cation
signal

1.

clockwise

plug

off by

from

m.

providing

n.
tuning
the

2-5.
nal
paragraph

each

has

its

the

operating

op­op-

out­(See

a.
in
case
At
shouldbewithin
sired

jack

(See

when

switch

used.

(2)

1,
to

b.
c

c.
tion

by

turning

it

2-6.

from

its

dial"
direction.
isinits

"on"

priortousing

light

up.

(5)

to

its

A

To
noisy
follow
graph
graph

a.

1-2.)

switch

(14)

to

inte
which

switch

(6)

to

b.

of

(16)toits

"0"

control
ing

switch

(3),

c.

to

received.

(10)tothe

and

d.

to

signal

This

to

"image"

signal

receiver

produce
600

kc.

for

"ima~e"

the

extent

at

7.4

mcisone

frequency

an

frequencies

would

havetobe

is

tunedto600

antenna

the

same

For

frequencies

ratioiseven

window (11)

the

frequency

frequencies

frequency

that
would havetobe

equal

effectonthe

the

would

havetobe

effectasa one

better.

below

is

rejected

when

the

desired

microvolt,

strength
even
kc,

the

of

more.

a 455 kc

2700

microvolt

other

than

600

tuning

ran~e

bandinwhich

and above

4,000
receiver.

the

frequencyislocated.

Turn

the

"RF

GAIN"

control

(8) to

its

position.

Turn

the

Turn

dial

desired

TUNING

follow

Turn

either

when

resonance

signal

Clamp

loc

kwise,ifdes

Readjust
for

comfortable

"AUDIO GAIN"

for

comfortable

the

"TUNING"

(18)

frequency

signal

PROCEDURE.

the

preliminary

2-4

and

the

"TUNING"

direction

the

meter

the

one
frequency
the

"TUNING LOCK" (9) by

ired.

the

"AUDIO GAIN"

frequencytobe

continueasfollows:

to

(20)

main

quarterofone

tuned

reception.

control

reception.

control

indication

To

requirements

control

resonate

indicationisa

dial

(18)

in.

(7) to a

(12)sothat

corresponds

tuned

in.

tuneinthe

(See 12,

the

figure

signal,

frequency

percentofthe

control

(7)toa

ADJUSTMENTS UNDER NOISY CONDITIONS.

provide

Switch

lligible

for
atmospheric
the

preliminary

2-4

and

2-5,

and
the

to

the

switch

reception

the

best

possible

or

man-made

requirements

the

tuning

procedure

continueasfollows:

"SELECTIVITY"

position

for

which

the

operational

mcw

reception

static

outlinedinpara­outlinedinpara-

switch

(See 5,

provides

engaged.

If

the

its

"SELECTIVITY"

"XTAL"

(16)toa

positions,

position

switch

turn

which

(5)isusedinone

the

"XTAL

phases

outaninterfer-

signal,ifany.

Switch

the

the

"LIMITER"

"LIMITER"

"OFF"

positiontoeliminate

toggle

ignition

others,ifany.

During

"stand-by"

periods

in

the

transmission

by

the

si~nal

strength

micro-

"image"

Also,

when

carrier

microvolts

signal

kc,

this

dial

indi-

the

desired

maximum

position

the

main

mcw

sig-

outlined

1-2.),

asisthe

maximum.

reading

turning

posi-

under

conditions,

figure

the

most

activity

PHASING"

switch

noise,

7.4
re-

of

At

in-

i-f

to

in

de-

it

in

(4)

5

Section
Paragraphs

II

2-7to2-11

AN

16-45-221

when

the

desired

the

"RF

GAIN"
maximum
ceiver

ING"
turn
avoid
trol
signal

intervals
output
output by
some
the

2-7.

noise

e.

Whileinthe

control

the

"RF

receiver

(12)istraversing

transmissions.

f. When

the

the

maybefavoredinrelationtothe

turning

point

operational

ADJUSTMENTS

NAL. When

paragraph
paragraph

sired

signal

readily
ference
by

a.

figure

b.

be

distinguishable

of

using

the

Switch

1-2.)to"CW".

Determine

usedtoaccurately
(13)to455
exactlytoits

c.

Indent

"MEGACYCLES"

cation

for

signal

control

clockwise

output in

processofinitially

(12)

to

GAIN"

noise

output while

signal

level

signal

level

the

most

suited

activity.

the

preliminary

2-4.)

and

2-5.)

do

not

frequency

any

kind,

following

the

"MOD"
some

kc,

which

"0"

knob

the

"BAND

window (11)

the

frequency

positiontocut

such

the

control

positionsatwhich

"RF

SUITABLE

the

duetoit

identify
procedure:

strong

set
dial

CHANGE"

frequencyislocated.

d.

Tuneinthe

"TUNING"

the

signal

(20)ata

e.

audio

f.

accurately

maximum.

Adjust

output,

Indent
"MEGACYCLES"
cation
signal

for

frequencyislocated.

g.

Turn

the

tion,toresonate

low

signal

control

(12)ineither

with

the

"BEAT

and

the

"BAND CHANGE"

OSC"

maintain
window

the

frequency

"TUNING"

the

desired

output.

h.

to

"MOD".

i.

Switch

Clamp

the
the

"MOD"

"TUNING

clockwise,ifdesired.

j.

Readjust
tion

for

2-8.

CRYSTAL
ERATION. When
vide

for
receptionofthe
ary

requirements

the

"AUDIO GAIN"

comfortable

FREQUENCY

the

fixed

signal

reception.

the

operational

frequency

frequency,

outlinedinparagraph

tinueasfollows:

a.

Switch
(See3,figure
or

"6"
signation
which
quency.

crystal

corresponds

carries

The

the

frequency

1-2.)toits

frequency

the

"XT

crystal

ALS"

frequencyis"off

(8) down

somewhat

down on

instances.

setting

desired

signal

(8) down

the

"TUNING"

fluctuates
is

GAIN"

to

the

low,

(fades)sothat

the

control

receiving

receiver

TO A WEAK

requirements

tuning

provide

procedure

for

tuninginthe

being

from

other

signals

the

desired

"CW"

setting

the

toggle

low

"BEAT

may

switch

frequency

not

setting.

control

tuning

range

bandinwhich

frequency

directiontoresonate

the

indicationonthe

control

this

(13)

setting

control

(ll)

tuning

range

bandinwhich

control

"cw"

(12),ineither

signal

toggle

LOCK"

for

switch

(9)

control

CONTROL UNIT

activity

crystal

controlled

follow

control
"1",

position

to

thatofthe

suited

switch

"XT

"2",

whose
to

the

(3)

positionisreadily

the

the

frequency,

somewhat

there

receiver

(8) down

conditions

too

weaktobe

frequency

OSC"

correspond

(10)tothe

dial

the

low

by

turning

for

for

it.
(10)tothe

dial

the

zero

beat

by

turning

(7)toa

istopro-

the

prelimin-

2-4,

ALS"

"3",

"4",

numeral

crystal

signal

air"

from

the

"TUN-

are

signal

(Refer
(Refer

or

inter-

(See

signal

control

signal

meter

zero

desired

direc-

(14)

and

switch

holder

turn

its

re-

to

con-

no

at

noise

to
of

SIG-

to
to

de-

14,

to

indi-

the

beat

indi-

audio

back

posi-

OP-

mcw

con-

"5",

de-

fre-

determined
(25)

alongsideofwhich

by

noting

the

numeralonthe

the

signal

plastic

frequency

is

chart

re-

corded.

b.

Turn

the

"r:,.

tion

on

when

c.

scale

the

indicationonthe

Turn

the
tiontofurther
when

the

d.

indicationonthe

Clamp

the

FREQ"

to

resonate

"TUNING"

resonate

"TUNING LOCK" (9) by

control

the

meter

control

the

signal,

meter

(15) in

signal,

(20)isa
(12) in

(20)

either

asisthe

maximum.

either

as

is

i.3

a

maximum.

direc-

direc-

the

turning

case

case

it

clockwise,ifdesired.

e.

Readjust

tion

for

2-9.

SUPPRESSED

the

modeofoperation

the

receptionofmcw
missions,
the

transmitter,

Thisisdone by prOViding

single

or

pressed

from

the

for

the
sions,
as

outlinedinparagraph

ception,

a.

When
suppressed
linedinparagraphs
so

that

2-5a

provides

b.

When
suppressed
linedinparagraph
procedure
the

carrier

side

band

signal,
tioninturn
proper

the

"AUDIO GAIN"

comfortable

reception.

CARRIER

singleordouble

the

desired

must

double

carrier

buffer

reception

follow

and

side
in

the

stage

of

the

preliminary

continueasfollows:

the

desired

carrier

transmission,

2-5,

the

tuning

the

carrier

for

the

desired

procedure

transmission,

2-5,

outlinedinparagraph

is

reinserted

being

from

received.

the

each

position

approach

tuning

control

RECEPTION.

contemplatedisto

side

signal

bands

associated

suppressed

carrier,

be

reinsertedatthe

for

thecwreception

and

reinserting

formofthe

with

carrier

455 kc

operating

2-11,asapplicable

signalisa double

continue

also

listeningtothe

outlined

most

intelligible

signalisa

single

continue

but

with

regardtothe

2-5a,

at

one

edge

Thus

when

resonantorproper

side,

choosing

for

which

the

(7)toa

posi-

When

provide

band

trans-

suppressed

receiver.

of

the

sup-

i-f

output

the

bfo.

Thus

transmis-

requirements

to cw

side

band

as

out-

signal

in

paragraph

signal.

side

band

as

out-

tuning

remember

of

the

that

single

tuninginthe

tuning

posi-

the

resonant

signalisintel-

for

at

the

re-

or

ligible.
2-10.
2-11.
1,

used.

it

"REC".
counter
"OFF"

will
Do
er.

"NON-XTAL"

CW

RECEPTION--TELEGRAPH.

PRELIMINARY REQUIREMENTS.

a.

Pluginthe

figure

b.

Switch

c.

Unclamp

1-2.),

headsetinthe
or

listen

the

"SEND"

the

"REC"

"TUNING LOCK" (9) by

-clockwise.

d.

Turn

the

"RF

positionina

indicate

that

GAIN"

the

control
clockwise
receiverisin

thisatleast15minutes

Note

that

the

pilot

e.

Switch

f. SWitch

the

the

"3"

"MOD"

lamps

"SELECTIVITY"

kc knob

"CW"

"PHONES"

to

the

loud

.

toggle

(8)

from

direction.

its

priortousing

light

up.

switch

dial

position.

toggle

speaker,

switch

turning

its

"on"

the

(5)

switch

if-ck (See

when

(2)

dial

knob

A

"click"

position.

receiv-

to

(14)

to

it

its

to

"CW".

g.

Switch
"MAN"
to

"AVC"
Remember
nal

indicationinthe

for

for

that

the

"AVC"

low-speed

high-speed

the

meter

"MAN"

telegraph

(20) only

"AVC"

toggle

signal

telegraph

signal

providesanr-f

positionofthe

switch

reception

reception.

switch

(6)

to'

and

sig-

(6).

6

AN

16-45-221

Paragraphs

Section

2-12to2-15

II

h.

Set

the

dial

i.

knob

j.

to

k.

1.

its

position.

Set

the

dial

position.

Switch

the

"VFO"

Determine

Indent

the

"BEAT

"XTAL

OSC"

control

PHASING"

frequency

control

position.

the

signal

frequencytobe

"BAND CHANGE"
"MEGACYCLES" window (11)
cation
signal

position

providing

the
2-12.

nal
paragraph

maximum
to

(18)
one

for

the

frequencyislocated.

m.

Turn

the

below

is

blocked

n.

Turn

off,ifon
the
for

o.

Turn

the

tuning

dial

desired

signal

TUNING

follow

the

2-11

a.

Turn

the

in

either

direction,

indication

procedure

providing

paragraph

frequency

percentofthe

b.

Clamp

frequency
"RF

bandinwhich

GAIN"

thatatwhich

"MAN",
"AUDIO GAIN"
comfortable
"TUNING"

(18)

frequency

reception.

control

indication

frequencytobe

PROCEDURE.

preliminary

and

continueasfollows:

"TUNING"

2-11g.).

reading

control

for

zero

on

the

for

resonating

At

resonance,

shouldbewithin

desired

the

"TUNING LOCK" (9) by

clockwise,ifdesired.

c.

Turn

the

"BEAT

rection

cps.

in

choose

which

d.
signal
for

2-13.

To

noisy

follow

graph
graph

a.

1-2.)tothe

to

get

Reception

one

directionascomparedtothe

positionineither

provides

Readjust

and

the

the

"AUDIO GAIN"

comfortable

ADJUSTMENTS UNDER NOISY CONDITIONS.

provide

for

atmospheric

the

preliminary

2-11

and

2-12,

Switch

and

the

"SELECTIVITY"

"XTAL"

OSC"

tone

output,

maybebetter

direction,

for

the

most

"RF

GAIN"

reception.

the

best

possible

or

man-made

requirements

the

tuning

procedure

continueasfollows:

position

reception.

b.

Turn

the

tion

which

phases

c.

Switch

the

"LIMITER"

and

others,ifany.

d.

Monitor

it

manuallytothat
nal,
position

2-14.

the

and

readjust

for

ADJUSTMENTS SUITABLE
NAL. When
paragraph
paragraph
sired
readily

2-11.)

2-12.)

signal

distinguishable

"XTAL

the

comfortable

the

frequency

PHASING"

01,ltaninterfering

"LIMITER"

"OFF"

positiontoeliminate

"RF

GAIN"
position
the

providing

"AUDIO GAIN"

reception.

preliminary

and

the

tuning

do

not

provide

duetoit

from

(13)toits

control

"XTALS"

control

tuning

control

the

and

receiver

full

control

(8)

on, if on
(7)toa

(12)sothat

tuned

To

tuneinthecwsig-

requirements

(See 12,

beat

meter

(20),

the

signal

frequency

control

(13)ineither

preferably

with

the

other.

no

intelligible

control

control

cw

static

outlinedinpara­outlinedinpara-

switch

which

provides

control

signal,ifany.

toggle

control

TO

requirements

procedure

for

being

other

signals'or

"0"

(16)toits

switch

received.

(10)tothe

range

dial

the

desired

clockwisetoa

noise

"AVC".

position

the

corresponds

in.

outlined

figure

audio

output

either

signal,

the

main

one

quarter

tuned

turning

around

control

turned

In any

matter

the

reception.

(8)

for

(7)toa

cleanest

position

reception

conditions,

(See 5,

the

(16)toa

switch

ignition

(8) by

the

control

noise,

adjusting

cleanest

(7)toa

A WEAK

(Refer
(Refer

tuninginthe

too

weaktobe

knob

"0"

(3),

indi-

output

main

to

in

1-2.),

or
tuning
(Refer

dial

of

in.

di-

1000
case

tone,

under

figure

best

posi-

(4)

sig-

SIG-

de-

inter-

ference

quencybyusing

a.

be

(See 13,
not

b.
"MEGACYCLES"
cation

of any kind,

the

Determine

some

usedtoaccurately

figure

correspond

Indent

1-2.)

exactlytoits

the

"BAND CHANGE"

window (11)

for

the

frequency

identify

following

strong

set

to

455

band

the
procedure:
low

the

"BEAT

kc,

"0"

tuning

in which

desired

frequency

OSC"

which

knob

dial

control

range

the

signal

signal

control

setting

setting.

(10)tothe

dial

low

signal

fre-

to

may

indi-

frequencyislocated.

c.

Switct

the

"AVC"

"MAN"

toggle

switch

(6)

to

"AVC".

d.

Tuneinthe
"TUNING"
the

signal

(20)ata

e.

beat

f.

accurately

maximum.

Adjust

audio

Indent
"MEGACYCLES"
cation

signal
"A VC"

nals

speed

tion,
audio

it

clockwise.
signal

for

2-15.

for

frequencyislocated.

g.

Leave

for

and

switchto"MAN"

telegraph

h.

Turn

the

to

resonate

output.

i.

Clamp

j.

Readjust

and

comfortable

CRYSTAL
ERATION. When
for

the

fixed
of

the

signal
quirements
as

follows:

a.

Switch

(See3,figure

or

"6"
signation
which
quency.

crystal

corresponds

carries

The

determined

(25)

alongside

low

signal

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maintain

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signals.

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reception.

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the

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CONTROL UNIT

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paragraph

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rec~ption.

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2-11g.).

direc-

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turning

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for

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7

Section

Paragraphs

2-16.
optimum
ed

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condition
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stance
13,a,b,c,and

2-17.

a.
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ting

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2-19.

II

2-16to2-27

DURING USE.

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DESCRIPTION

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to

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Paragraphs

Section

2-28to2-39

11

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the

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2-32.
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ceiver

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2-33.
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than

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ure
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the

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CAUTION

Never
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2-36.
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2-37.
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ance
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2-38.
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2-39.

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Section

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AN

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V14.
V15.
V16.
V17.
V18.
V19.
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8.

3.5

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First

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Second
Driver

Beat
Beat

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Cathode

Audio

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regulator

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10

Figure

2-2.

Radio

Receiver,

Top

View of

Chassis

AN

16-45-221

Paragraphs

Section II

2-40to2-47

2-40.tt6 FREQ" "HI",

"2", "3",

15,
the
operation.
arbitrary
from
of

operationisbeing

2-41.
2-42.

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EXAMPLE:
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2-44.

1-2.),

matching

an 8000 ohm

2-45.

microvolts

to

Table

2-1.

Decibel

RF

db

-6
0

+6
+20
+40
+60
+80
+100

Microvolts

0.5
1
2
10
100
1,000
10,000
100,000

"METER"

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the

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(7)

headset

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level

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the phones

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loud

the

audio output

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When

the

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"AUDIO GAIN"

headset.

Table

2-1

may

or

a-f

milliwatts

thedbreadingsofthe

Conversion

db

-10
0

+6
+10

+15

"RF"

"AF"

figure

can

determine

With

operator

1-2.),inits

the

switch

can

with the "AUDIO GAIN"

and/or

speakerare

speaker.

both

availableissufficient

activity.

control

500

milliwattstoa 600 ohm

15

milliwatts

be

usedtodetermine

respectively

meter

r-f

and

Chart

AF

Milliwatts

0.6
6
24
60
190

spring

the

normal

strength

return

"RF"

depressed

determine

the

con-

Even

when

connectedtothe

(See 7,

are

figure

provided

the

r-f

equivalent

a-f

scale

cali-

of

to

to

to

brations.
2-46.
2-47.

at
metal
openings
cores
ment
figure

is

1-3.),
not
without
ance
casion
(See 6,
factory

PRECAUTIONS TO BE OBSERVED.

The

the

operating

receiverisprecisely

factory

buttons

for

optimum

(See 1,

figure

usedtogetatthe

andcapacitor

trimmers.

meansaswellasthe

1-3.),

and the

screw

driver

"METER

meter

controls,

respectively

and

the

should

figure
for

maximum

meter

arisetoreadjust

impairing

scale

1-3.)

whichisscrew

bfo

receiver

2-2.),

various

"METER

ADJ

adjustment

and

cannot

the

calibrations.

the

buffer

aligned

performance.

cover

inductance

These

receiver

ADJ

AF"

be

receiver
"BFO

driver

output

and

adjusted

the

chassis

tuning
align-

RF"

(See 7,

(See 8,

figure
means,
manipulated

perform-

Also,nooc-

INJ"

control

setatthe

injection

volt-

The

are

age.

11

Sections

III - IV

AN

16-45-221

SECTION III

3-1.

GENERAL.

The
denceofmaintenance
that

the

receiver

complete

and
tainedinthe
1-3.),

containedinthe
communication
cerning

the
understood.
made

prior

are

outlined

3-2.

In

instancesoffixed
operations,
be

written

on

the

front

trol

unit,

crystal

contain

the

complementofoperational

thataspare

"SPARE

link,

contemplated

The

operational

to,

and

below.

the

operational

on

the

panelofthe

appropriate

ers.
3-3.

PRIORTOOPERATION.

a.

Switch

periodofat

b.

Check

band

and
mechanically,
cal

use.

c.

Adjust

activity

the

receiver

least15minutes.

both

for

make

sure

while

Refertoparagraphs

the

operating

contemplated.

2-15,asapplicable.

d.

ciated

Establish

transmitter

the

communication

radio

receiver

approval

three

FUSE"

rear

apron.

the

operational

activity

checks

during,

each

channel

signal

plastic

chart

receiver.

holders

(See2,figure

crystals

"on"

cw

and

mcw

each

control

properly

controls

Refertoparagraphs

to

contact

OPERATING

must

for

use.

ampere

holder

(See9,figure

To

instructions

must

and

operational

crystal

frequencies

(See 25,

The

in

the

and

allowawarm

reception

and

switch
performing
2-19

thru

for

the

link,

the

using

remote

CHECKS

show

evi-

Checktosee

spares

fuseiscon-

maintain

con-

be known

adjustments

activity

controlled

must

figure

1-2.),

crystal

2-2.),

correct

on

con-

must

hold-

each

functions

its

electri-

2-40.

operational

2-3

thru

the

asso-

station,

the
and

up

as

AND

ADJUSTMENTS

applicable,

is

3-4.

tored

andtoprovide

the

receiver
crystal
for

fixed

is

also
ceiver
in

strength

established.

the

need
tional
noisy
paragraph
vides
tor

the
3-5.

a.

Consult
signal
of

the

b. Notify

a

new

the

schedule

teriorated

c.

Advise
to

stand-byatintervalsonan

nel

frequency

dependentonthe

DURING

during

OPERATION.

usetomaintain

for

frequency

for

variable

frequency

dependentonthe

signal.

Further,

andinquality

The

qualityofthe

for

monitoring

activity

conditions,

for

receiver

2-6.

cw

reception,

provides

monitor
When

as

optimum

tuning,

operation,

outlinedinparagraph

activity.

the

stability

andiscrystal

frequency

the

receiver

for

the

receiver.

for

the

the

operational

under

The

receiver

communication

reception.

approaches

the

communication

stabilityofthe

signal

the

communication

reception

When

mcw

reception,

receiver

noisy

conditions,

PRECAUTIONS TO BE OBSERVED.

the

time

table,

if any, with

frequencytobe

operational

the

signal

remote

frequencyistobemade,

requirements,

qualityofthe

the

remote

so

used

activity.

station

station,

that

contact

duringaparticular

when

the

or

for

signal

reasonofthe

being

received.

priortoswitch-over,

alternate

may

be

whether

specified

is

moni-

Even though

that

of a

controlled

may

vary

determines

the

opera-

under

as

outlined

activity

pro-

moni-

2-13.

regardtothe

phase

switch-over

due to

chan-

maintained

link

link

re-

link

in

to

de-

in

caseofemergency.

4-1.

OTHER

4-2.

ANTENNA SYSTEM.

be

operated
one
other
ferably

4-3.
tron
each

terminal

tube type

electron

withasingle

terminal

grounded,

ELECTRON

plementofthe
each
tify
the
spare
tube

tube.

the

receiver.

failure,

Figure

locationofeach

electron

12

THAN NORMAL

insulated

of

the

antenna

of

the

antenna

but

need

TUBE

COMPLEMENT.

and

the

tube

reference

comprising

receiverismetal

2-2

maybeusedtorapidly

specific

In

the

instanceofthe

tubes,

table

and

specific

4-1

maybeusedinan

EMERGENCY

OPERATION.

The

radio

wire

input

input

connectorispre-

not

be,inan

symbol

the

electron

stamped

electron

receiver

receiver

connected

connector.

emergency.

The

designation

tube

adjacent

inden-

tube

used

unavailability

electron

emergency

SECTION IV

OPERATION

may

to

The

elec-

of

com-

to
in

of

AND

to

maintain

Turn
Wear
remOVing

4-4.

REPLACEMENT

4-5.

PILOT
2-2.),
lifting
the
ket,
moving
four

areofthe

the

pilot

while

it.

do not

REPAIR

continuityofservice,

when

WARNING

the

receiver

gloves,toprevent

"hot"

LAMPS.

pilot

lamp

lamp

counter-clockwiseinrelationtoits

exerting

Before

light,

tubes.

bayonet

socket

inward

replacing

make

"off"

OR
The

sure

when

changing

severe

REPAIR.

pilot

lamps

type

and

off

its

pressure,

a pilot

a-c

power

applicable.

tubes.

burns,

(See3,figure

are

removed

support,

and

light,

plugisplug-

when

twisting

then

when

by

soc-

re-

all

AN

16-45-221

Paragraphs

Section
4-6to4-9

IV

gedinthe
"on".
figure

replacement,
contained
the

4-6.
or
socket
clamp
be

4-7.
V10,
electron

V20,

ELECTRON

V19

retainer

drawn

To

Vl1,

JAN

Tube

Type

6AL5

With

1-2.),inits

and

electron

clamp

out
remove

tubes

a-c

source

the

in

in the

the

must

out

from

V12, V13, V14, V15, V16, V18,

(See

V14, V15, V20

receiver

"OFF"

turn,
"FUSE"
V19

rp.ctifier

TUBES.

tubes

first
from
its

the

figure

Reference

Symbol

and

that

the

receiver

"RF

GAIN"

switch

replace

holder

(See

be

the

tube
VI,

V2, V5, V6, V7, V8,
2-2.),

positiontomake

the

three

(See 10,

tubes,

(See

To

remove

figure

opened

tube,sothat

socket.

Table

2-2.),

by

the

4-1.

V15

V14

control

respective

Remove

is

(See

ampere
figure

figure

the

V3, V17,

each

spreading

the

tube

or

Chart

turned

the

fuse

1-3.),

2-2.).

tube

the

may

V9,
V20

tube

for

Other

8,

Replace

V14

V15

Than

For

or

or

shieldisfirst
while

exerting

of

the

pin type

appropriate
4

-8.

To

remove

2. ),

loosen

Then

turn
exerting
of

4-9.

receiver
tain
tifies
wise,

V20

V20

inward

the

pin

type

Anyoneofthe

may

the

operational

itself

keeping

Normal

removed

inward

and

are

tube

remover.

the

the

knurled

the

tube

shield

pressure,

andisremoved

electron

require

when

the

Operation

Operation

Limited

any

i-f

immediate

activity.

its

filament

receiver

to

output no

by tWisting

pressure.

preferably

V4

electron

screw,

holding

counter-clockwise,

to

remove

accordingly.

tube

The
does
tuned,

Limited
limiter

non-operative

counter

These

tube

complementofthe

replacementtomain-

defective
not

replace

Effect

avc

tubes

removed

(See

the

tube

it.

The

light

on

Operation

and

meter

-clockwise
are

with

the

figure

shield.

while

tube

tube

iden-

up.

Other-

the

tubes

af,

all

2-

is

6C4

6BA6

6BE6

OA2

5R4GY

6AC7

V4, V8, V13

VI,

V2, V7, V9,

VIO,

Vl1,

V5,

V6

V18

V19
V3

V:12

V14

V4
V8

V13
V8

V7

V12

V6

V18

use
use

and

and

spare*
spare*

V15

V13

V20

V8

or

V13

V4orV13

V4orV8
V4

VI,

V2, V9, any above 7. 4

V10,

Vl1,or

V12

VI,

V2, V7,

V9,

V10,or

Vl1

V5

none any

V19
V3

i-f

fixed
any

mc
AMcw
AMcwbelow

7.4

mc

AM

any
mc

any
any

output

freq

below

mc

cw

below

ose

7. 4

7. 4

limiter,
avc,

non-operative
none
none

none
none

none

none

none

freq

and

instability
none
none

meter

sensitivity

af,

.

12AU7

6V6GT

*The

V16
V17

"use

spare"

presumes

use

spare*

use

spare*

the

availabilityofsaid

V16
V17 any

tubes.

any

none
none

13

Section

IV

Paragraphs

4-10to4-13

AN

16-45-221

in

the

following

reading,inthe

and

V16,
turn,

since

If

the

meter

electron

tubetomake
reading.Ifthe
sence

electron

of audio output,

tubes
replaceinturn
Where
V7,
above

the

electron

7.4
tubes,inturn.
and

the
FFO,
Next,
in
tubes,

V4
replace
try

turn.

(Refertoparagraph
regulator
a faint

4-10.

violet
CRYSTALS.

frequency

knurled
the
the
stal,
kets,

thumb

retainer

crystal

the

numbered
frequency
assembly
top of
thumb

4-11.
was
25,
the
and
The
they

the

screw

Mark

selected,inmegacyclesonthe

figure

"XT

ALS"

canbeerasedtochange

numerals

agree

sequence.Iftht:

absenceofaudio

V14

electron

they

involve the

does

not show a

sure

meter

indicatesareading,

also

used

for

cw,

the

signal

mc

electron

replacing

With

tube

Vl1,

tunedinis

tube,

and

replace

When

operating

tubes,

the

V5

and

theV2and

regardtothe V20

shouldbereplacedifit

glow.

To

control

from

screw

spring

unit (See 4,

(5) on

assembly

the

crystal

crystalisinserted

"1", "2",

control

(6)

crystals

unit (4).

forwardsothat

in

the

(5).

the

signalfrequency

1-2.),provided

control

with

on

the

the

(3).

chart

numerals

panel

meter

shows

tubes

a-f

sectionofthe

reading,

the

output,

(See

meter

replace

figure

change

can

2-2.),
receiver.

the V15
indicate
in the

replace

but

V10,

the

fornometer

and

V9,

electron

V13 and V12,

reading,

below 7.4mcreplace

when

the

the

V3

V8

and

VFO,

in

turn;

electron

signal

tuned

the

V6

electron

replace

when

operating

tubes,inturn.

theV1electron

and

the

V19

4-5.).

The

removeacrystal

figure

topofthe

2-2.),

unit (4) and

(6)tothe
socket.
in one of

To

the

rectifier

V18

voltage

does

not show

from

loosen

rear.

Remove

insertacry-

crystal

"3", "4", "5", "6",onthe

Bring

the

retainer

the

springs

sockets,

for

for

this

Pencil

or

these

shouldbeused

on the

are

over

and

tighten

which

the

plastic

purpose

ink

crystal

chart

alongside

maybeused

figures,ifdesired.

so

crystal

V17,

ab-

tubes.

the

in

the

V5

tubes;

the
the

push

soc-

spring

the
the

(See

that

socket

a

positions,

which

are

also

indicatedbythe

"XT

ALS"

switch.

in

4-12.
located

a

the
fuse
in a
sure
clampedtothe
the

is

spare
fuse
similartothat
these
outlined. When a
than
(9)itis
spare
fuse

3-AMP

FUSE.

in the FUSE

rear

apronofthe

holder

while

turningitapproximately45degrees

counter-clockwise

in

this

position

topofthe

topofthe

3-amp

holder

fuse

fuseislocated

(9) which

outlined

two

fuses

the

spare

that

providedinthe

preferably

fuseisalways

holder

(9).

To

replace

holder

(See 10,

receiver,

direction.

will

release

fuse

holder

may

can

be

above.

procedure

3-amp

"SPARE FUSE" fuse

used

so

availableinthe

the

3-amp

figure

pressinthe

Removing

the

fuse,

holder.

then

The

be pulled

in the "SPARE

removed

To

is

the

in a

replace

reverse

fuseisavailable

that

in an

emergency,

"SPARE FUSE"

fuse,

1-3.),

on

topofthe

the

pres-

spring

fuse

and

apart.

FUSE"

manner

either

to

that

other

holder

A

of

a

CAUTION

sure

that

the

fuse

Make

usedisdesignated

3-amp.

4-13.
tail
the
No.
place.
leads
from
soldering
When the
amp

3/8-AMP

type

fuse,

bottom

10-32

plateisremoved

screws

The

fuseisremovedbyunsoldering

from

terminal11of

chassis

another

receiver

fuse

shouldbechecked

FUSE.

the

To

receiveristurned

which hold

ground.

fuse

The
in the

audio output

replace

the

by

removing

the

power

the

bottom

transformer

fuseisreplaced

placeofthat

goes

"dead",

firsttosee

3/8-amp

pig-

bottom up and

the

seven

cover

its

in

pigtail

and

by

re-

rem.oved.

the

3/8-

whetherithas

blown.

CAUTION

Make

sure

the

is

3/8-amp.

designation

on the

fuse

used

14