Hallicrafters S-38 Manuale utente

•

installation

and

•

operating

• • •

Instructions

for

model

5-38

radio

receiver

· ,

•

AUCUST,1946

94

.

16

2.

A

the hallicrafters

CD

•

••

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CIU

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11

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ON

Ie

I

QUI

'MElIT,

(H

ICA

GO

24

, U. S.

I.

,

.

I.

INSTALLA

TION

AND

OPERATING

I N.STR

UCTIONS

FOR

RADIO

RE

CEI

VER

MODEL

S-38

Figure 1. Radio Re

ceiver

Moclel

5-38,

front

view.

DESC

RIPTION

GENERAL.-

The

Model

S-38 is a table

model,

six tube

superheterodyne

radio

receiver

capable

of

receiving

standard

broadc

ast a

nd

foreign

or

domestic

short

wave

stations

over

four

frequency

ranges

with

continu

ous cove

rage

provided

from

540

kc

(kilocycles)

to

32

mc

(megacycles). A ba

ndswitch

is

provid

ed

for

selecting

the

four

ranges

of

reception

which

are

indicated

on

the

main

tuning

di

al scale.

The

am

ate

ur

ba

nds

are

also

clearly

indicated

on

the

main

tuning

dial

scale as

ref

er

ence

for

the

ra

dio

amateur. A

bandspread

dial

is

pro

-

vided

for

fine

tuning

of

short

wave

st

ations,

the

use

of

which

is

described

later

in

these

in-

structions.

Special features

are

provided

to

improve

reception

such

as

volume

control

and

noise

limiter.

Provision

is

made

for

the

op

tional

use

of

a

headset.

A

beat

fre

quency

oscillator

is

provided

for

rendering

code

sign

als

intelligible,

this feature

being

especially

useful

to

ra

dio

amateurs and

code

enthusiast

s. .

This

receiver

is

designed

to

op

e

rat

e

from

a 11 7-volt a-c/d-c

source

a

nd

requires

30

watts

of

power.

Connection

to

the

power

sou

rce

is

made

by the

two

prong

plug

which

is

attached

to

the

six

foot

lin

e

cord

extending

from

th

e

rear

of

the

cabinet.

A special exte

rnal

re

s

istance

line

cor

d can be

supplied

on

request

for

oper

a

tion

on

220

to

250

·volts a-c

or

doc.

The

complete

receiver

is

12%

inch

es

wide

by 7% i

nches

high

by

8%

inches

deep

and

weighs

10

pounds.

1

The

maximum

audio

output

of

the

receiver

at

the

speaker

is

0.8

watt

with

less

than

10

per

cent distortion.

MECHANICAL

DESCRIPTION.-The

Model

S-38

radio

receiver

is

housed

in

a

well

venti-

lated

sheet

metal

cabinet

to

minimize

electrical

interference

and

provide

mechanical

strength

.

Access

to

tbe

top

of

the

chassis

may be

had

without

removing

the

chassis

from

the

cabinet.

Mixer

and

oscillator

trimmer

adjustments

may

be

made

from

the

bottom

of

the

cabinet

through

the

holes

provided

for

this

purpose

under

the

notice

card.

Two

holes

on

the

bottom

near

the

front

of

the

cabinet

are

provided

for

oscillator

padder

adjustments.

All

controls

for

·

tuning

and

operating

the

receiver

are

located

on

the

front

of

the

receiver.

figure 2. Radio Receiver Model 5-38, b/oclc diagram

showing receiver circuits.

ELECTRICAL

DESCRIPTION.-

The

block

diagram

(Fig.

2)

illustrates

the

function

of

the

receiver

circuits

in

a

simple

manner

which

is

described

as

follows:

Radio

signals

are

picked

up

at

the

antenna

and

fed

to

the

antenna

coil

of

the

mixer

stage

where

the

desired

station

signal

is

selected by a

resonant

circuit

and

fed

to

the

mixer

tube.

At

the

same

time,

the

oscil-

lator

section

of

the

tube

generates

a

local

r-f

signal

which

is

mixed

with

the

incoming

station

signal.

An

intermediate

frequency

signal

of

455

kc

(kilocycles)

is

selected

by

the

first

i-f

transformer

and

fed

to

the

i-f

amplifier tube

where

it

is amplified

and

then

fed

through

the

second

i-f

transformer

to

the

detector-first

audio

amplifier

tube

where

it

is

demodulated.

The

audio

component

of

the

signal

is

then

amplified by

the

triode

section

of

the

tube

and

capacity

coupled

to

the

audio

power

output

tube

where

it

is

further

amplified

and

fed

to

the

speaker.

The

a-v-c circuit

is

a conventional

one

and provides stability

when

listening

to music

or

voice

(phone)

broadcasts.

It

is

in

use

when

the

AM

/

CW

switch

is

in

the

AM

position.

The

beat

frequency

oscillator

stage

operates

in

the

CW

position

of

the

AM

/

CW

switch

and

provides

an

r-f

signal

at

455

kc

(kilocycles)

which

is fed

to

the

detector

stage

to

beat

against

the

i-f

signal,

thereby

rendering

code

signals

intelligible.

The

pitch

of

the

code

signal

can

of

course

be

varied

by

means

of

the

CW

PITCH:

control

which

will

permit

a

variation

from

o

to

1,000

cycles.

A rectifier

stage

provides

a

well

filtered

source

of

high

voltage

to

the

plate

and

screen

circuits

when

the receiver is operated from

an

a-c source.

2

INSTALLA

TION

AND

OPERATION

INSTALLING

THE

RECEIVER.-

1.

As

soon

as

the

receiver

has

been

unpa

cked,

examine

it for any

apparent

damage

which

might

have

occurred

in

shipment.

If

any

da

mages

are

found,

file a

claim

IMMEDIATELY

with

the

transportation

comp

any.

If

pu

rc

hased

"over

the

counter",

ex

amine

thoroughly

for

any

possible

visible

defects,

BEFOR

E ACCE

PTANCE.

2.

This

receiver

is

equipped

with

rubb

er

mounting

feet

for

mounting

on

a

table

or

other

piece

of

furniture.

Do

not

mOllnt

this radio

on

a radiator,

gas

stove

or

other

area

subject

(0

excessive

heat

or

humidity. Metal

surf

aced areas are

not

recommended.

3.

An

external

antenna

should

be

conn

ec

ted

to

the

receiver

as

follows:

On

th

~

rear

apron

of

the

receiver

chassis

is

located

the antenna

connector

strip,

marked

AI

,

A2,

and G.

Select

one

of

the

antenna

systems

de

s

crib

ed

below

and

connect

it

to

this

Strip

as

directed.

An

'

ex~

(ernal

ground

connection

is not e

sse

ntial to this receiver, but

in

some

lo

ca

tions

will

give

better

reception.

If

it is

desired

to

u

se

an

ex

ternal

ground,

always

conn

ect it

to

(he

terminal

on

the

strip

marked

"G";

NEVER

connect

it directly

to

the

receiver

SINGLE

WIRE

ANTENNA INSTALLATION

chassis.

A.

Single

Wire

Antenna.-

When

using

a

single

wire

antenna

installation,

connect

a jumper be-

(wecn

the antenna

terminals

A2

and

G .

Then

connect

a

single

wire

antenna

of

about

50

to

75

feet

(including

lead-in)

to

termi-

nal

AI.

Use

#

14

(A

WG)

or

heavier

wire

for

best

results.

Erect

the

antenna

as

high

and

free

from

surrounding

objects

as

possible.

This

type

of

antenna

works

well

where

the

signal

to

noise

ratio

is relatively

high

and

a

more

elab-

orate

installation

is

nOt

practic

al.

1-

----

50

TO

100 FEET

------j

JUMPER

TO

GROUND CONNECTION

Figure

3.

Single

Wire

Antenna Installation.

B.

Doublet

Antenna.-

The

doubl

et a

ntenna

is

recommended

where

the

receiving

con-

ditions

are

poor

or

where

maximum sensitivity is required ovec a relatively na

rrow

range

of

fre

quencies

.

The

lead-in

wir

es

from the antenna are

th

en

connected

to

terminal

s A1

and

A2.

If

a

concentric

line

with

ground

ed ou

ee

r

conductor

is

used,

connect

the

inner

conductor

to

terminal

A1,

the

outer

conduct

or to A2 a

nd

connect

a

jumper

betw

e

en

te

rminals

A2

and

G.

(1)

.

To

det

e

rmin

e

the

·

pr

op

er

len

gt

h

of

the

doublet

antenna

in

feet:

(a) De

termine

the f

re

qu

ency

ra

nge

to

which

y

ou

wish

to

li

sten.

(b)

Divide

4

68

by the

freq

uency (in

megac

ycles)

of

the

high

frequency

end

of

[he

ran

ge

y

ou

se

lect

ed.

(2)

To

prepare

the

ant

e

nn

a

for

ins

talla

tion:

3

I

J

(a)

Measure

the

wire

to

the

length

determined

in

step

(h)

above

cut exactly

in

half

then

insert

insulator

at

that

point.

(b)

Wrap

and

solder

the

two

wires

of

the

lead·

in

to

each

of

the

quarter~wave

sections

at

the

insulator

as

shown

in

Figure

4.

Keep

in

mind

that

this

type

of

an·

tenna

is

directional

broadside

to

its

length

and

should

be

so

ori·

entated

if

maximum

pick.up

from

a

given

direction

is

desired.

For

reference

to

other

types

of

an·

tennae

refer

to

the

latest

edition

of

the

A.R.R.L.

Radio

Am

a

teur

Handbook.

section

on

a

ntennas

.

HEADSET

RECEPTION.-

·

Phone

tip

jacks

located

at

the

I

DOUBLET ANTENNA INSTALLATION

USING

TWISTED

PA

IR

LEAD-

IN

~(.)

I

I----L

(FEET).

48&

......

·

-----1

FREQUENCY

I

Me)

I

TO

GROUND

CONNECTION

rear

of

the

receiver

chassis

are

Figure 4. Doublet Antenna Installation.

provided

for

he

a

dset

reception.

A

high

impedance

headset

is re

commended

for

use

with

this

receiver.

When

headset

recep·

tion

is

desired,

insert

the

cord

tips

into

the

PHONES

jacks

and

set

the

SPEAKER·PHONES

switch

at

PHONES.

EXPLANATION

OF

THE

RECEIVER

CONTROLS.-Scanning

across

the

front

of

the

reo

ceiver

from

left

to

right

the

controls

and

an

explanation

of

each

is as

follows:

NOTE.

Some

of

the

control

markings

are

in

RED.

This

is

an

added

feature

incorporated

for

the

convenience

of

the

listener

who

is

not

familiar

with

radio

terminology

as

an

aid

in

setting

the

controls

most

used

for

the

reception

of

standard

broadcast

stations.

Reference

to

Figure

5

will

help

in

becoming

familiar

with

the

use

of

the

controls.

IF

HUM

IS

PRESENT

when

operating

the

receiver

from

an

a·c

source

of

power,

reverse

the

line

cord

plug

in

the

power

outlet.

If

rhis

does

not

remove

the

hum

,

then

it is

recomm

e

nded

that

a

good

ground

be

connected

to

rhe

ground

terminal

at

rear

of

rec

eiver.

Rolnto ,,mIlt dinI poinl

e.

Indicat

es

d

eshe

d stll.

lion I,c

que

ncy. W

hen

u

sIng

8A NO

SP

RE

A D

dial

,olnle

unlil

dial

I)o

ln

le'

is

sllgh

lly clOck.

wi

."

P

t>5t

IIcsl.ell s

ta·

tlon I

.eaucncy.

Push

Ul)

to

uSe

s

llea~er

.

Pu

sh

down

when

us

ing

ohones

(head

se

t).

Push

OIl)

lor yolce or

mus

ic recCl)l i

on

Push

down

lor

code

re.

cepl

lon.

I"Uli"llItl

-+-----0

8

PR.UER

"'"

~

o

liOlSa

•

LDUTlDi

l'tI

O!(R

S

'"

P

ush

down

11

stoll

e:

Is

eA

ee

uiye.

Push

UII 1

0'

normal

ro·

cel)llon.

Tu.n

10

lelt or ri

ght

Selll

l

desi.ed

band

10 give del ired 0 1 rllcept

,on

.

p1t

e:

h 0 1

code

Sl

g.

nnl.

.,'''

'''''

~-+--

ST

AlmOT

Sa

l al leyel 0 1 yolo

ume

to

pltUII

111-

tencr.

fjgure

5.

Radio Receiver Model 5-38,

view

showjng use

of

con'rols.

4

Se

l a t

"0

"

when

luning

wl

lh main l

uning

dial.

U

se

1

0'

line

tuning

0 1

Iho.

t

WOYII

stations.

PUlh

UP to

'llce

lye.

Push

down

10.

Itllndby

•

Turn

cloc

kw

I

se

to

lu'n

on

the

recel

yer power.

1.

TUNING.-

This

control

tunes the receiver to the frequency

of

the

desired

station

which

is

read

directly

on

the

main

tuning

dial scale,

locat

ed to the

right

of

the

control,

and

is

in·

dicated by the RED

pointer

when

the

bandspread

pointer

is set at

"0".

2. SPEAKER·

PHONES

switch.-

This

switch

connects

the Output

of

the

receiver

to

the

speaker

or

a

headset

depending

on

which

one

is used.

3.

AM

/

CW

switch.-

This

switch

is used

to

connect

the beat frequency

oscillator

into

the

detector circuit for the

reception

of

code

s

ignals

and to

connect

the automatic

volume

con-

trol

circuits

for

the

reception

of

broad

cast

and

phone

stations.

4.

NOISE

LIMITER

switch.-

This

switch

connects a circuit

which

clip

s

the

noise

voltage

peaks

generated

by electrical

disturb

ances,

there

by

providing

intelligible

rec

e

ption

in

cases

where

reception

would

normall

y

be

imposs

ible.

This

fe

ature

will

not

totally

remove

the

noise

but

will

do

a

good

job

of

limitin

g it to

reasonable

levels.

5.

CW

PITCH

control.-

This

control

varies the

inductance

of

the

beat frequency

oscillator

coil

thereby

providing

a means

of

varying the

pitch

of

the

code

sigoals

from

0

to

1,000

cycles

depending

00

the

listen

er's

dis

cretio

n.

6.

BAND

SELECTOR

switch.-

This

switc

h selects

one

of

the

four

bands

or

frequency

ranges

availahle to

the

listener

.

The

fr

eq

uencies covered by each

band

switch

position

are

read

directly from the

main

tuning

dial scale.

7.

VOLUME

control.-

This

control

regulates

the

audio

signal level at

the

speaker

or

head·

set

and

should

be

set to a

position

which

will

provide

a level

of

volume

most

pleasing

to

the

listener

.

Ganged

to

this

control

is the receiver

power

switch

which

connects

the

power

to

the receiver

when

the

control

is

turned

clockwise.

8. RECEIVER·

STANDBY

switch

.-

This

switch

disconnects

the

d·c

volta

ge

from

the

reo

ceiver

while

'

leaving

the tube heaters at

ope

rating temperature, thus

leaving

the receiver in

condition

for instant usc.

This

switch

is used

by

the radio amateur "ham" to put the receiver

in a

standb

y

condition

when

tr

ans

mittin

g.

For

the

general

listener

it

p

ro

vides a

means

of

putting the receiver in an operative

condition

ready for instant usc.

9.

BAND

SPREAD

control.-

This

control

is used

indep

e

ndeot

of

the

main

tuning

control

to

provide

for

fine

tuning

of

short

wave sta

ti

ons

. See Figure 5

for

illustr

a

tion

on

use

of

the

contro

ls. Also

following

paragraph

on

band

spreading.

BANDS

PREA

D

TUNING

FOR

THE

AMATEUR.-

To

use

the

bandspread

di

al,

set

the

dial

pointer

at

"0",

set

the

main

tuning

dial

pointer

at

the

high

frequency

end

of

the

range

to

be

covered

and

tune

in

the

stations

with

the

BANDSPREAD

contro!'

Example:-Assume

you

wish

to

listen

in

on

the

20

meter

band.

Set

th

e

BAND

SELECTOR

switch

as

position

#3,

the

main

tuning

dial

pointer

at

14.4

me

(

megacycles),

the

high

frequency

end

of

that

band,

and

then

set

the

band

spread

di

al

pointer

at

"0".

You

can

now

listen

on

the

20

meter

band

by

cuning

with

the

BANDSPREAD

cuning

contro!'

The

above

example

holds

true

for

any

of

the

frequenc

y

ranges,

altho

the

higher

in

frequency

is

the

range

of

cuning

on

the

main

tuning

dial

scale,

the

narrower

will

be

the

range

of

cuning

on

the

bandspread

tuning

dial

scale.

B

ands

pread

cuning

is

not

necessary

on

the

broad.

cast

band

(Position

# 1

of

the

BAND

SELECTOR

switch)

.

5

FOR

THE

SHORT

WAVE

LISTENER.-

To

tune

in

short

wave

broadcast

radio

stations

with

the

bands

pre

ad

dial,

set

the

bandspread

dial

pointer

at

"0",

set

the

main

tuning

dial

pointer

slightly

clockwise

past

the

frequency

of

the

station

you

wish

to

tune

in

and

then

tune

in

the

station

with

the

BANDSPREAD

tuning

control.

IMPORTANT.-

The

calihrations

on

the

main

tuning

dial

scale

are

only

correct

when

BAND

SPREAD

dial

pointer

is

set

at

"0".

OWNER'S

MAINTENANCE

PREVENTIVE

MAINTENANCE

.

-Keep

the

various

parts

of

the

receiver

clean,

especially

the

tuning

capacitors.

Dust

and

dirt

should

be

blown

out

with

dry

air

or

brushed

out

carefully

without

bending

the

capacitors

plates

in

the

slightest.

Noisy

reception

may

be

als',' caused

by

dirty

condensers

wipers,

faulty volume

controls,

switches

and

tubes,

etc.,

in

the

receiver.

Check

switch

contacts

and

controls

and

make

sure

that

all

tubes

are

always

in

their

sockets.

c

@)

GT;\;

~ ~

GT GT

IT]

8

SP

KR

.

soc

W

@

@g

GT

IG e 8

@

~

@ S

"-

Jl

A

Figure

6. Radio Receiver Model 5-38,

view

showing tube locatio

ns.

REPLACING

THE

TUBES

AND

DIAL

LAMP.-It

will

be

necessary

to

remove

the

fiber

back

cover

of

the

receiver

in

order

to

replace tubes

and

dial

lamp.

This

can

be

accomplished

by

removing

the

twO

rear

screws

on

the bottom plate and then

removing

the four

screws

which

hold

the

cover

to

tbe

cabinet.

When

replacing

tubes

,

cbeck

tbe

tube

type carefully

and

replace

with

the correct type. Refer to the top

view

of

the receiver chassis, Fig. 6, to determine the

location

of

each tube.

The

receiver

employs

one

dial

lamp

with

bayonet

type

socket

to

illumi-

nate

the

two

dial scales.

Replace

this

lamp

with

smaller

type,

6.8

volt,

150

rna.

"brown

bead"

G.E.

#4

7

or

equivalent.

The

color

code

referred

to

is

the

color

of

the

glass

bead

above

the

glass

stem

inside

tbe

envelope

of

the

lamp.

PERIODIC

ADJUSTMENTS.-

This

receiver

has

been

carefully

aligned

at

tbe

factory

and

should

nOt

require realignment until it requires

new

tubes in the

mixer-oscillator

stage

or

shows

signs

of

loss

in sensitivity, off frequency calibration

or

requires service

work

on

this

stage.

Alignment

should

nO!

be a((empted by

inexperienced

persons

as

maximum

perform-

ance is

obtained

only

by

intelligent

alignment.

.

6

ii1l)erre

nt~

The

Hal/i

eTaJlers

Co

mpatly

W4r

r

41J1J

each

lIew

radio product mOllu,-

Jactured

by

it

to he f ree

from

defective

material

and

workmanship

alld

agrees

/0

remed

y

nlly

INch defect

or

10 jurl1;sh a

new

pari

in

e::cchallge

Jor

4ny

pari

of

Imy

utlit

oj

its

manufactur

e

which

und

er

normal j'lslallati

olJ,

use

aud

servi

ce

disc/ous such

dljec/,

pr

ovi

ded

the

IIl1it

is

delivered

by

the

ow

ner 10

ollr

authorized radio

dealer

or

wholesaler

fr

0111

whom

pur

chaJed,

i,,'a

CI, for our

exam;natiOll

with

all

transportati

on

charges prepaif/ within ninefy days

from

the

date

of

sale

10

origitull

pur

chou,.

mu

l

pr

ovi

ded

Ihal

such examination dis-

closes

i"

our

judgm

e

nl

thai

it

is

Ihm

defective.

This

warrallly

dot!S

not

extend

/0

(111Y

0/

o

ur

radi

o products which

have been subjected to

mi

suse, lIeglut, accident, ;'Icorrect wir;,zg

IIOt

our

OWI/,

impr

o

per

imt

a

ll

dtioll, or 10 use

i"

violati

oll

oj

i11Slruclio,u

jurnished

by us,

1I0r

extend

to uttits

flJhich

have been repaired or

altered

outside

oj

our authorized

fa

cilities,

tl

or to cases whert! Ihe

serial

number

th

ereof has been removed,

defaced

or c

hang

ed,

1I

0r to

accessories

used

ther

ew

it

h

110t

of

oll

r

OW"

manufacture.

AllYpa

rt

of

a

u"il

approvedfor remedy or exchange hereunder

will

be re

medied

or exchallged by the authoriz

ed

radi

o dealer or whole-

sal

er

without charge to the owner.

This

warrattty is ill lieu

of

other warrattties ex

pr

essed or

implied

alld

no

represellta

ti

ve or persoll is authorized to assume

for

us allY

other

liability;',

comuctioll with the sale

of

our

radi

o

pr

oducts.

the

co.

SERVICE

BULLETIN

No.2

FOR

MODEL

5-38

GENERAL

:

Model

5-38

is a 6

tube

AC

jDC

superbeterodyne

table

model,

radio

receiver,

incorporating

4.

bands

of

AM

/

CW

reception,

as

follows:

band

#1,

540

kc

to

1650

kc;

band

11

2,

1650

kc

to

5.0

me;

band

#

3.

5.0

me

ro

14.5

mc

;

band

#

4.

,

13.5

me

to

32.0

me.

Provision

for

A

ve

,

noise

limiting

,

BFO

pitch

,

headset

reception

,

standby

operation,

and

bandspreading

are

provided.

REAR

PANEL

CONNECTIONS

:

Consist

of

line

cord

with

plug,

antenna

and

ground

connector

sui

p.

and

headset

con-

nector

plug

strip.

POWER

SUPPLY

DATA:

10

5

to

125

volts

AC

jDC

lin

e

vo

lta

ge.

Power

drain

is

30

watts.

TUBE

TYPES

AND

FUNCTION:

12SA7

-mixer-oscill

a

tor

;

12SK7-IF

amplifier;

12SQ

7

GT

-det

e

ClOc

,

AVe

,

audio

ampli-

fier; 3

5L6GT

-audio

power

amplifier

;

12SQ

7

GT

-BFO

and

ANL;

35ZSGT

-

power

rectifier

AC

operation

.

.-Fig.

1.

Fron,

view

of

r

eceive

' .#towing control locations.

If

FREQUENCY

455

kc

REF

.

NO.

(in

NAME

Fig.

I)

If

SELECTIVITY

7

kc

wide

at

6

db

down

65

kc

wide

at

60

db

down

(for

50

milliwatt

output)

DETAILED

SERVICE

INFORMATION

IMAGE

RATIO

2.7:1

at

30

me

6:1

al

14

me

10:1

at 5

me

35:1

at

1500

kc

SENSITIV

IT

Y

12

microvolt

at

600

kc

12

miccovoh

at 5

me

11

microvolt

at

14

me

23

microvolt

at

30

me

(for

50

milliwatt

output)

AUDIO

OUTPUT

675

r:nilliwan

with

less

than

10

%

distortion

at

400

c

ycl

~s

CONTROL

SETTINGS FOR

PRELIMINARY

reST

OPE

RA

TION

(Br

o

adcast

Band)

REF.

NO.

FUNCTION

SETf

ING

(in

NAME

FUNCTION

SETTING

Fig.

I )

STANDBY

/

Receiver

temporary

At "RECEIVE'" 5

SPEAKER

!

Output

selector

At

"SPEAKER'"

RECEIVE

standby

PHONES

swi

tch

2

VOLUME

Audio

gain

co

nt

rOl

Half

clockwise;

adj. 6

CW

/ AM BFO

on

/

olT

switch

At

"

AM"

(AVe

on)

and

receiver

on

/

olf

as

necessary

A

VC

on

/

off

swi

t

ch

switch

7

NO

I

SE

Noi

se

peak

At "

OFF"

3

BAND

Operating

band

Clockwi

se

to

"

1"

LIMITER

limitin

g

SELECTOR s

elector

8

TUNING

Main

tuning

To

local

station

freq

.

4

PITCH

CW

beat

note

Any

position

control

on

main

dial

scale

CONTROL

pitch

se

l

ector

(not

in

us

e)

9

BAND

SPREAD

Shon

wave

To

"

0"

on

sma

ll

band

spreading

dial

scale

HOW

TO

RESTRING

DIAL

CORDS

To

restring

the

main

tuning

dial

cord,

cut

a 14"

length

of

30

lb.

test

dial

cord

and

tie

one

end

to

the

tension

spring

of

the

main

tuning

capacitor

drive

pulley

at

position

.•

I"

on

the

diagram

.

Following

the

numbers

I

through

15

.

wind

the

cord

on

the

pulley

and

knob

drive

shaft.

At

position

,.

15,"

stretch

the

tension

spring

and

tie

the

cord

secure

ly.

Cut

off

the

excess

cord.

Note

that

two

complete

turns

are

wound

on

the

knob

drive

~ haft.

To

restring

the

bandspread

tuning

dial

cord,

C

ut

a

16

"

length

of

dia

l

cord

and

follow

the

procedure

as

explained

above

.

except

sta

rt

:\1

position

"

N'

on

the

diagram

and

proceed

through

position

" S."

Note

that

the

knob

drive

shaft

has

twO

complete

turns.

13,9,5

-.

MAIN

TUNING

1-----'

I

I 3 I

I.-

_____

J

BANDSPREAD

TUNING

CAPACITOR

FULLY

CLOSED

(BOTH

SECTIONS)_

FRONT

VIEW

Fig.

2.

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