Rcavictor Ar-88.lf User manual

..

I

1

~.

-,,',

i

) i

!

i-

I '

\ ,

.

~

(,

I

••

J..

l'

i

COMMUNICATIONS,

RECEIVER

.

~

.....

"

..

-,

'.

':.~.

c •

. .'

"~'

..

::\~~

•

~,,,:..;.:.:lI~

.....

--

',-,

MODEL AR-88.LF

"

.•

_.~IN$TRUCTIONS_

"'"

n'U

f"

c t U

red

by

.

~

....

:..-.,.

~

.~

';":'-~_r-"'"

"-.:~'-

.

.... .

.'

RCA Victor

'Company,

Limited

M 0 n t

rea

I.

Can

a d a

,

'\

t .

..

:.(

-

,--

",'

",

:~=

PRINTED

IN

CANADA

1137'15·1

-

.

..

.•

_._'-"C.-:'-,.

',:1

~"'.~-~'"

~~~_~,..:.....

-

..

,'

.....

...,..--:;

....

.

:,,:,.

•

_~~,~~,~~,E-.,

..

:~

~.~

,',

..

'

--

<~:-:

'-~~

";:

,:

....

--';

..

".

~

.~,

......

,......

. .

*--

'.'"

. ".,-,' ,.• ::

~

'.

~

..

,.,0.

.f"

.

.....

'" -

..

.'

~

..

~,'

,

.)

• p -

.'

-~

•

".---.-

~

J-

~~,

•

-.

.

•.

>'

•

~

'~

..:

••

":~.J_,,.,

.•.

"',".-;';,-.

c;.·

-......-

".·c

.-

:,-.;:.:~"",

:,~~

..

:

..

~.,...

:-~

.•

-~~

..

,::",,;.--. :

""

';

.:-'

.

..

••

•

Figure

]

.~General

Purpose

Communication

Receit1er-Front

Vietc.

•

'-,"-"

)

..

.Figure

2.-GcTlcral

Purpose

Communications

Recciver-Loud.speaker.

[2J

\

-;

,

....

. .,..,-'

GENERAL

PURPOSE

COMMUNICATIONS

RECEIVER

INSTRUCTIONS

1. GENERAL

1.1 Thi!t

n~cei\."cr

has be(;fl designed for general pur-

pOSt!

cummunication.

It

is.

designed

to

withstanJ

scvert! climatic

and

line \'oltage variations.'

without

appreciable:

impairment

in performanc-:..

1.2

The

following> features

hayc

been

incorpurateJ

into

the

design

of

this

unit.

(a)

Mechanical

Band

Spread, }"ith Single

Con·

trol for ease

of

tuning

a previousl)' logged

station.

(b)

Automatic

Noise Limiter

which

automa-

tically limits

interference

to a percentage

of

modulation. .

(c)

Noise

Limiter

Switch for switching Noise

.

Limiter

on

or

off.

(d)

Continuously

variable

High

Frcquenc)'

Tone

Control.

(c)

Panel

Antenna.

Trimmer

ft.)r

circuit align·

~t

ment.

(f)

Variable

selectivit)"

with

expansion

of

the

normal selectivity characteristic for stand-

br,

and

a crystal filter for

ultra

sharp

selec·

tivity

when

required.

The

crystal filter circuit

is

adjusted

at

the

factory to give selectivity

characteristics as

shown

in

Figure 12.

(g)

Temperature

compensated oscillator circuits

on

all bands.

(h)

Regulation

of

the

anode voltage

of

the

oscillator,

giving

good

oscillator stability

through

normal

variations in line voltage.

(i)

Four·ganged

Condenser

gi"ing

high image

ratio,

and

very

low oscillator radiation

on

all. bands.

(j)

Special screening

d"'ices

have

been

built

around

the

gang

condenser,

the

master aScii,

iatur'section, anti the r.t. amplifier secti

..

}n

ir.

orJer

to

minimi:c

.9::..:i!lawr radiatiun

u:'i

0:1.11

bands,

(k)

Tuning

lock

for

sance

under

extreme::

con-

ditions

o'f

\ribration.

1.3

Frequency

Range:-

Band

1

73

to :!05

KC

Band

2 195

to

550

KC

Band

3 1480

to

4400

KC

Band

4

4250

to 12150

KC

Band

5 11900

to

19500

KC

Band

6 19000

to

30500

KC

1.4

Sensitivity:-Better

than

15

microvolts

for

20

dh

signal to noise ratio,

for

MC\V'

(

..

\·1)

reception

and

better

than

5 microvolts for

CW

(A·

1) reception (see

tahle

No.

1).

1.5

Radiation:-Lcss

than

40 mkro-mkrowat::s.

of

power

radiated,

as

dissipated in resistance .:on·

neeted frum

Antenna

input

terminal

to

grouno.

Value

of

resistance is sueh as to cause m:'ximum

power

to

he

radiated

(scc Section l

helow).

1.6

Output

Power:-(Maximum

undistorted)-2

.

.5

Watts

when

loudspeaker

used.

When

lo\.\.-

im-

pedance

headphones

are used,

maximum

output

fed

to

the

phones

is

lOO

milliwatts

approximate'

ly.

1.7

Pow...

Supply

Requirements:

-

11

5

or

1,0

.

"bIts,

15/60

cycle, 100

Watts

or

6

volt.

D.C.,

11

amps

when

external

power

supply

MI·22213

is

used.

(Note-external

power

supply

MI-:!:!:!15

is

only

supplied

wh'en specially

ordered.)

1.8

Output

Load:-

-This

receiver

has

pro\'ision in

the

output

circuit

to

take loads

of

'2.5

ohm:s. :!o

ohms,

and

also

low

impedance

headphones.

1.9

Mechanical

Specifications:-Overall

Dime~-ioru

-19t

inches

wide

x

11

inches

high

x

19!-

inohe3

deep.

Weight

--·100

Pounds

(unpacked).

2.

TECHNICAL DETAILS

2.1

Circuit

Details

and

Features:-

The

schematic

diagram

of

this

receiver

is

shown

in

Figure

11.

It

consists

of

two

stages

of

R.F. amplification.

first detector, first

heterodyne

oscillator;

three

of

LP. amplification, second

detector

and

A.V.C.,

noise limiter, second.

heterodyne

oscil-

lator; A.F. amplifier stage,

output

power

stage,

and

power

supply

system.

2.2

Input

Coupling:-

The

antenna

coupling system

is de:;igned to

provide

optimum

coupling from

a .200

ohm

trans,?ission line,

but

equivalent per-

formance is realized

with

a

straight

line

antenna

·'It,

\:l

,

.-~

'.

[4]

(see Section

4.4)

with

a

conventional

lead·in

v.rire.

The

first

tuned

circuit is provided 't\dth a

trimmer

condenser

adjustable

from

the

front

panel.

This

insures

the

proper

tuning

of

this

circuit

with

any

antenna

system.

For

all

bands,

conventional

antenna

and

ground

connections

may

also

be

used.

The

antenna

.terminal

board

is

pro,~ded

with

three

terminals (see Figures 3

and

7),

rn'o

of

which

may

be

joined

together

with

a link.

\Vhcn

a

sin~le

",';rc

antenna

is used,

the

link

should

be

closed

and

the

antenna

connected

to

"A".

If

a

ground

is

used,

it

should be

connected

to

·~G"".

!

•

..

,

(

..

"

..

,

·

-.'

•

-.

.-..ci

..

If

a transmission line

or

balanced

input

is used,

the

link should

re

opcned

and

the

line con-

Ih;..:t..::J to t":[I111nal ".i\"

and

the

c~lller

tcrmilld.l.

Protectioll

against

damage

Ju('

tl)

high

yoltagcs

acrOS$

the

antenna.

coil

primarics

is

provided by

a gas gap

protector

(Type

991

Valve).

This

protector

will

brc3.k

down

with

an

applied

potential

of

approximately

.50

Volts

R.M.S.

1.3

R.F.

Amplifier:-

The

R·F

Amplifier

is

designed

to

provide

ample selectivity

ahead

of

the

tirst

detector

for

minimizing cross

modulation

and

blocking effects from

strong

interfering

signals:

and

for

obtaining

a

high

degree

of

image

signal

suppression.'

The

amplification

is

-adjusted

to

provide

optimum

signal-to-noise

ratio

by

making

noise

contributions

of

circuits following

the

first

valve negligible

in

comparison

with

the

noise

contributed

by

the

first R-F arid

cir~uitj

that

is,

each

tuned

circuit

in

the

r~ceiver

contribut~s

some noise

"(:'oltage,

but

by

making

the

gain

of

the

first valve as high as practicable,

the

noise

contributed

by

succeeding circuits

is

unimportant.

2.4

Band

Spread:-

Tho

mechanical

band

spread

with

single control knob enables

the

operator

to

tune

quickly

to

a previously

Jog~£ed

station.

The

log scale

on

the

main dial and

the

separate

ver~

nier

dial

provide

for

exact

logging

and

tunina'.

1.

.5

First

Heterodyne

Oscillator:-

The

first

he:te~o'

dyne

oscillator

is

alig1"!eu

to track

with

the

R

..

F

Amplifier

at

735 kc higher.

than

the

signal fre·

.

quenq",

thus

producing

-a 735 kc

intermediate

frequency

in

the

first'

detector

plate

circuit

which

is amplified

further

in

the

I·F

stages.

The

oscillator voltage is regulated by

the

Type

VR·

150

regulator

valve to

provide

maximum

ft.e-

quency

stability

under

con.dit~ons

of

variations

in

power

supply

voltage.'

2.6

Intermediate

Frequency

Crystal

Filter:-

The

first

detector

plate

~ircuit

is

tuned

to

the

intermediate

frequency

and

a balanced

link

circuit

is used

to

couple

the

first

detector

pla.te and first I·F grid

circuits. A

735

kc crystal is

connected

in

onc

arm

of

the

link circuit

by

the

selectivity

s'W-itch

and

a

neutralizing

capacitor is

connected

in

the

other.

The

impendance

of

the

coils

in

the

link

drcuit

are

designed

so

that

the

crystal selectivity

characteristic is

not

impractically sharp_

The

b:tnd

width

at

two

times

resonant

input

may

be

ad-

Justed

to

550 cycles, 2000 cycles, 4,000 cycles,

SOOO

cycles,

or

16,000 cycle,.

For

this adJustment

sc~

"Operation".

2.7

Intermediate

Frequency

Amplifier: -

Three

stages

of

I·F

amplification are used;

Type

65G7

yah-es

are

used in all stages

and

a

Type

6l:i6

nh"e

is

used

for

A

VC

and

second detector.

The

first I-F

transformer

has its

primary

and

secondary

tuned.

and

is

coupled

through

the

crystal filter link.

The

second and

third

I·F

[5]

'.-.~.:

.'-'.':'p"qfi'---

transformers

are

composed

of

four

tuned

cir-

cuit~

each. Thc:,c circuits arc varied in coupling

by

th..:

s,,;k,,:u\"l[Y

swit..:h.

The

fourth

I-F Trans·

furma

hit!:

t\.\"()

tuncJ

circuits.

Th~

third

I-F

stage

is.

not

connected

to

the

A

VC

nor

to

the

manual

volume

control

50

that

a good A

VC

characteristic

\\·ith little overload

distortiun

is

obtained.

This._also permits tht:

C\V

o~cillator

to

he

courkJ

to

the

grid circuit

of

this stage,

2.8

Second

Heterodyne

Oscillator:

-

The

se.:ond

hcterodyno

(CW)

os<illator

is

a

triode

Type

GJ5

valve

which

is electrostatically coupled

to

the

final.

I-F

stage.

.A

panel control is pro\-ided

by

means

of

which

the

frequency

of

the

hetero-

dyne

oscillator

and

resultant

audio·

beat

note

may

be

·varied.

Particular

care

has

been

taken in

the

design

of

the

circuit

constants

to

minimi:e

oscillator

harmonics.

2.9

Automatic

Volume

Control:-·-

The

AVC

voltage

is

obtained

from

the

second detector, a

Type

6H6

....

ah-~.

l\

'yariable delay

is

obtained

dcrentl·

ing

on

the

setting

of

the

R,F gain control.

The

second

heterodyne

(CW)

oscillator

ex'

citation

,.-oltage is

just

lower

than

the

A

VC

diode bias

....

oltage

so

that

it does

not

decrease

thl! sensiti\"ity

of

the

receiver.

2.10

Manual

Volume

Control:-Two

manual

vol~

ume controls

arc

pro

....

ided:

an

audio gain

con'

trol

which

is

emplored

when

the

AVe

is

in

use,

to

obtain

the

desired

output

le\-ei, and'

an

R·F

gain control.

2.11

Noise

Limiter:--

The

noise

limiur

cin.:uit utili:.es

a

Type

6H6

valve

and

limits

the

noise inter-

ference

to

100fo

modulation

and

to continuously

lower

percentages

dO\"'n

to

any modulation

whatsoever,

determined

by

the

setting

of

the

noise limiter cuntrol.

A noise limiter

switch

in

conjunction

~'ith

A

VC

provides

for

use

or

the

noise limiter

on

C\V

or

on

modulated

reception

when

interference

is

present.

2.12

Output

Valve:

-

The

Type

6V6GT(G

output

valve is resistanc.:;

coupled

from

the

A·F

ampli~

fier, a

Type

65]7

vah'c,

and

operates

into

an

output

transformer.

which has

tap!

for

mat~hing

into

a 2.5

ohm

load,

or

headphones.

Terminals

are provid.:d

on

the

rear

apron

for

each

of

thc...~

load impedances.

The

output

from

the

2.5

ohm

tap is fed directly to

the

~.5

ohm

output

ter-

minal, while

the

outrut

from

the

~o

ohm

tap is

fed

to

the

~O

ohm

outpUt

terminal

and

alSt)

to

a

jack

mounted

on

the

panel.

With

the

rhone

plug

inserted

into

the

jack,

the

phones

arC

across

the

20

ohm

output

and

a load resistor.

R-56,

pro\;des

corre..:t

matching

for

the

valve

and reduces

output

5upplied

to

the

headphonc:;.

:-.

-,:: . "

"

.'

.'.

r

\

...

':.

-----._.

-w

_'

..

---

-.

.•

2.13

Power

Pack:--The

power

pa..:k

mounted

on

the

r('~.:i\·I.~r

~h;\~~i5

~on5i5t5

of

a

power

rran:;:funner,

r..:~::h..:r

YJ,h-·.:

Typ..:

~Y:l~T,

(; J.EJ

tiI:,;,;

.•

\

tVb~l.:

~wit,;h

i~

I'f()YidcJ

on

rh.: rc.lr

arror.

f"r

chaI1>!"

ing

the

power

transformer

yoltagc

rar

to citht:'r

115

or

2~O

Volts.

The

instrument

may

also

h~

operated

from

6V.

"A"

and

c50 to

:00

V.

"B"

battaies.

(See

Section

1-4).

2.14

Vibrator

Power

Unit:-

The

M.r.-22'216

Vibrator

Pov.:er

Unit

is

designed

for

us~

with

this

Re-

ceiver

to

supply

the:

DC

yo!tage necessary

from

6 \'olt

DC

battery.

It

is a

separate

ass<mbly

and

is

tined

with

a

plug

to

attach

it

to

the

receiver

•

by

means

of

Socket

J-l

on

the

rear

apTtJn.

(Note.

---ThIS

Vihrator

Powa

Unit

is

only

supplied

\\;--...

;1

sp":":ld.liy

unl..:reJ.)

It

(,~)n5i::t::

of

non·syn..:hrnnou5 'Vir-raroT used

i~

LonJunction

with

a

step-up

tra.nsfonner. Rc.:tifi-

cation

is

obtaincJ

by

the

use

of

;1

typ~

OZ.;.A

\'alvc:

(SI?C

Section 7

below.)

2.15

Shielding:-Interstagc

shielding IS

pro\-idcd

to

insure sta

..

biliry

under

all

operating

condition~

and

to minimi::.e

oscillator

radiation.

Complet~

external

shielding

pre\'cnts

coupling

to

a.ny

par·

tion

of

the

circuit except·

through

the

antenna

circuit.

3.

PERFORMANCE

3.1

The

performance

data

belo":'

and

the

data

for

the

various

curves,

(Figuus

12, 13, 14)

arc

approximate

values

taken

on

a sample receiver.

Variations

in

these

values

a.re

to be

expected

because:

of

practical

manufacturing

to1erances.

The

data

were

taken

with

an

artificial

antenna

of

700 mmf. capacity

for

hand

I

and

c

and

"00

ohms resistance for

bands:';

to

6 inclusi"·e.

The

output

was

measured

across a resistan_ce

of

2.5

rhms

connected

in

place

of

the

speaker

"'oice coil.

The

selectivity switch

was

placed

in

position

:!

unless

otherwise

stated.

Figures

are

for

MC\\"

(A.-:?) rc('epti-on, unless

otherv.;se

stated.

'-

3.2

Performance

Data:-Approximate

values

only-

Taken

on

Sample

Recci\'er.

(See

Ta~k

I.)

TABLE No. I

Band

1

2

"

:J

4

5

6

f Frequency

I in

Ko.

I

i 140

I 195

;

I 205

I 375

I 500

I

,

I

1,600 I

i 3,000

! 4.250

4,+00 I

; 7,500

I

I 11.900

! 12,100 I

i 15,500

19.000

19,500

~'7.500

30.000

Input

in microvoits

for

10

db

s. to n.

C\\'?(A·l)

re<:eptton

..

3.1

2.8

1.8

2.6

3.7

2.6

1.9

1.8

3.7

2.0

1.8

1.7

2.9

-

2.'

1 •

_.,

3.0

".8

I

.,

,

I

i

;

,

!

I

Inpl.:t in micro\'oits

fo:

10

db

s.

to

n.

1"0

_.

12.5

10.5

6.0

8.0

9.8

8.0

6.5

0.0

9.5

'1.9

. 7.0

7.0

8.2

7.0

7.5

7.9

7.7

,

!

I

,

:

i

I

Image

Ratio

I . I •R.adiatlon

.

I.F.

Rejection Ratio fron:.

Qs.cillilor

I in micro·.a::icro

....

.ltt!

t

th

1

000000

grea er

an

t

th

1

000000

1

lC3S

than

05

grea er

an

..

I

..

~

I .05

..

1,000,000 .

..

" .05

..

1,000,000

..

.05

..

1,000,000

..

.05

1,000.000 I 37,000

..

.05

,

1.000.000

greater

than

1,000,0001 .05

.1

100,000 ,

,.

..

~

.03

,

c5,OOO

..

.05

600.000

..

.05

11.000 ,

..

.05

6,000 !

..

.. ..

.05

,

15,000 ,

..

.03

5,000 ,

..

I

.09

.

>,100 .05

4.000 .05

600 .135

375 .300

• R"d:.l.leJ

J."O"'er

musured

IS

that

JJSUP3t",..l

In

a

re5uto~

c.1nnecltU from Am::::n:u

f'USI

t

...

,.:wun..l.

V.due

of

reSJstur

IS

thJ.t

"'hKn

ren:H.

::::.

="XI:.".";;'

~ll"'-er

bc::'I":

.r~di.ued.

[6]

--

•

(

•

(

~

•

\

'.

,

....

3.3 . Oscillator

Stability:-

(a)

Oscillator frequency

",,,1.

within

O,OOI],c

for

line

\"oltJ.gc YJ.riatinl1

rf

:::

5~(-.

(b)

Oscillator frequency stable

within

0.000%

for tempcratur.:: chang\,' nf 1

::c.

(c)

Oscillator

frequency

stabl~

within

0,1)01:"(

for

total

variatiun

of

both

.the audio

and

R.F. gain controls.

(d)

Resetting

of

ranc:c switch from either

din~c'

tion

does

not

\:ary

the

frt:quency

of

the

oscillator

on

any

hand

more

than

1 kc.

3.4 Dial

Resetability-bttter

than

2 kc.

when

the

dial

is

reset from

either

direction,

at

any

frequency.

.3.,)

Dial

Calihrati"n:-C;di~ration

of

tht: dial is

accu'

rate

to

within

O.5

c

(-.

3.6 A

VC

Chara('tcris~ics:--Thc

A

VC

..

-ir,,::ulc

holds

th~

auJio

output

k\·e\

to

12

db

wh("n thi:

MeW

(A·2)

input

IS varied between 10

and

100,000

·microvoir.::

at

any

fr~'-lucncy,

with a.ny

modula-

tion percentage frum

11)

to

90,

and

\\;th

any

modulation

fx:.~qu(;ncy

from

~00

to

400')

cy..::les.

(Sce Figure

H.)

:--~

.,

4.

INSTALLATION

4.1

Power

Supply:-The

power

,upply

circuit

is

integral

with

the

receiver. Determine line volt-

age

and

frequency and check

with

the

rating

of

the

receiver.

The

power

transformer

primary

may

be

connected

for

either

113

or

230 volts

23/60

cycle

by

means

of

the

toggle switch

on

the

rear

apron.

This

toggle

~

switch is protected

by

a

protector

plate.

To

alter

the

conne.:tion

of

the

primary, remove

the

protector

plate,

throw

the

switch,

and

replace

the

prot..:ctor

plau,

'\vith

the

reverse face out.

4.2

For

Battery

Or

Other

Supply

O,Peration:-For

connections see S'Chematic Diagram Figure 1t.

It

is only necessary

to

remove

the

plug

from

the

socket

on

the

.rear

of

the

recei

....

er,

and

connect

the

batteries

to

the

proper

terminals as indi-

cated

by

the

schematic diagram. A

battery

cable

terminating

in

9-n

octal male plug

is

neces'

sary

for

this

purpose.

If

the

Vibrator

Power

Unit

MI·22216

is

used,

remO\'e

the

plug from

the

socket

on

the

rear

of

the

receiver.

and

plug

in

the

cable from

the

Vi·

brator.

Power

Unit.

Connect

the

6 volts D.C.

input

to

the

power

unit

with

heavy, low resist-

ance leads. See Section 7. for

more

detailed

information

concerning

the

Po\ver Unit.

4.3

~ah'es:-Inspect

the

chassi::

before

applying

LIN£

VOl.'Au£

AO./VSTM£NT

SWITCh'

o

POVE.~

OMS

CO,ep

TO

,el'lNSl'1lTTCe

.eE;l..AY

roe

8ATT£e

y

opeRATION

eTC.

R£MOV£

PLV<U

CO/'fNE.fT

8I1TT£,eV

TO

SOCK€T(O/-I

.

power

to

see

that

all

val~'es

are firmly seated in

their

respecth-e sockets.

._

4.4

Antenna:-

The

input

impedance

at

the

an-teMa

terminals

is

designed to

match

a 100 to

~oo

qhm

transmission line

or

a

straight

wire capacity,

type

antenna.

For

general use

it

is recommended

that

a

straight

wire

antenna

between 25 and

50

feet

long

be

used

for

bands 3 to 6 inclusive,

and

a.

........

wire

of

200 feet

or

more

for

bands

1 and 2.

4.5

Spe-aker:-

Terminals

for connection

of

a

loud·

sp..:aker

arc

inJkat.:J

in

Figur~3

?-

and 7.

The

output

transformer

is

designed to match a

p.m.

dynamic

speaker

having

2.5 ohms impedance.

4.6

Headphones:-A

jack

is

pro\;ded

on

the

left

of

the

front

panel

for

plugging in a

pair

of

head·

phones.

If

additional phones are required.

the)'

ma),

be

conn.:..:tcd to

the

20

ohm

output

ter-

minals on

the

rear

apron

of

the

receiver.

Phones

ha'\"ing

an

impedance in

the:

range

of

11::

..

)

to

600

ohms

should

be

used.

4.7

Mounting:-

The

instrument

may be placed on

a

table

or

mounted

on

Cl-

rack.

For

rack

mount-

ing

loosen

the

panel mounting screws·

and

re-

mo'\'e

the

front

panel

and chassis compiete

from

the

cabinet.

Then

mount

on rack by

r:lean~

of

the

slots at

the

sides

of

the

panel.

ANTCNNI'I

COIL

INOt/CTANe£

.€CA

-

/lOO!}7

AO./VSTM£NTS

FOJ?

I'Il-L

IJANpS

61/5

U"lP

PROT£CTO.e

WAVC

T.eAP

'"

T8.

(

'\

ANT-GNP

TC.eH.

8D.

Figure

3.-General

Purpose

Communicatiuns

Rcccieer-Rear

Apron

[7]

EZJC)

:.

..

'.

5,

OPERATIO~

5.1

Bci,)rc

attcmring

to

orerate

the

rccei\"a.

the

information contained in this section should be

thoroughly

understood

by

the

operator.

Tn<!

symhols

on

panel u5cd

to

desIgnate

the

various

controls

as

shu\vn in Figure

1,

should be learned

with respect

to

function, as described

h~r~in.

5.2 The-

Antenna

T

rimmer:-

The

center

knob

on

the left is

the

Antenna. Trimmer. Before tuning

on

any

frequenc)' range, it should

be

adjusted

for maximum performance on

the

band.

This

control

may

be

adjusted

-by

tuning

for

maximum

background

noise.

Occasionally

it

is desired

to

test

a.

signal

that

seems

out

of

place, to see

whether

or

not

it

is

a

fundamental signal

or

an

..image

....

Wlfen

doing

this, if

the

maximum signal

point

coincides v·:ith

the

point

of

maximum

background

noise,

the

signal is a fundamental.

If

the

control

doe,

not

affect

the

signal strength,

or

if

it

is

'a maximum

at some

other

point, it

is

an

"image",

5.3

The

Main

Tuning

Dial

is

on

the

left and con-

sists

of

Cl

disc

with

SC\'en

scales, one for

eac~

of

the

six

bands

and

a log scale.

The

twe

lo\\' fre·

quenc)'

bands

are calibrated in kilocycles

and

the

other

four

bands in megacycles.

5.4

The

Vernier

Tuning

Dial is

in

the

center

and

has a scale

with

arbitrary

calibrations

for

exact

tuning

and

log records

of

particular

communica-

tion stations.

It

is used

in'

COn

junction

with

the

log scale on

the

main

tuning

dial to give addi·

tional figures

for

logging.

5.5 Power-

Transmit-Receiver

Switch:

-

This

is

a

four-positiop switch:

Starting

from fully coun·

ten:lockwise these positions are:

1.

Power

off.

~

Transmit

position

which

gives energi:.ecl

tube

filaments,.

open

plate

circuits, and

shorted

terminals

(for

transmitter

relay)

on

the

speaker

terminal

board

on

the

back

of

the

chassis. (3.

fi

4.

on

T.B.·Z.).

Connect

rday

to

these two terminals for transmitter

operation. (See Figure 3.)

.

'.

Normal

reception.

4.

CW

reception -Beat

frequency

oscillator

switched

on.

5.6 Selectivity

Switch:

-

This

is

a five-posinon

switch and

the

band

widths

and

control

of

selectivity are illustrated in

the

curves

of

Fi:;urc

11.

The

five positions are:

1.

I·F

band

width

for

High

Fidelity, modu·

lated reception, -

for

"Stand·by"

use.

o

I.F

band

width

for

normal

modul"teJ

reception.

>.

Crystal

Filter in -for

CW

telegraph

or

sharp

modulated signal reception.

'

..

[8}

Cryst..d Filter

in

- -

for

!-harf'Lr

CV".,

tele-

graph

reception.

...

Crystal

Filta

in -for snarr\:.5t

C\V

tele·

graph

reception.

5.7 Noise

Limiter-A

VC

Switch:-

This

is

a four·

position switch

and

starti~g

from

the

fullr

counterclockwise- position thc.x: are:

1.

A

VC

and

NL

out

_.

Manual

gain only -

for

CW

-

n'o

interference.

o

NL

on, A

VC

out

-

Manual

gain -for

CW

\vith interference.

,.

Nt;. and A

VC

on

-for

Modulated

Recep'

tion

with

interference.

4.

A

VC

on,

NL

out

--

for

ModulateJ

Re<ep·

ticn

-no interference.

S.B

RaF

Gain

Control:-

This

continuously variable

sensitivity control is

for

use.in conjunction

with

the

audio

gain

(Volume)

control for all manual

gain operation.

With

A

VC

on, it

should

as a

rull!

be

set to its fully clockwise position

or

may

ht::

turned

to

eliminate interfercn;:c-.

For

re..:ep-

tio!1

of

strong

CW

signCils,

it

mu::

he

retarded

somewhat.

5.9 Noise Limiter

Control:-

This

control sets

the

instrument

for

operation

at

the

required per-

centage

~'alue

of

Noise

Limitation.

The

fully

clockwise position limits

the

noise

interference

to

1007c modulation.

As

the

knob

is

turned

counterclockwise,

the

noise interference is

lim~

ited to continuously lower percentages

of

modu#

lation so

that

in

the

fully counterdock\.

....

-ise

posi#

tion

the

Noise Limiter

is

operati\.·c

on

ani'

modulation \vhatsoever. Normally.

the

fully

clockwise position will be used,

rut

under

ex"

treme conditions

of

interference

a t-alance point

should

be

found

for

maximum inte!lig:ibilitv

of

signal

with

best modulation

and

lel~t

~oise.

~

5.10

Tone

Control:-This

is a continuously variable

control for reducing

HF

response.

In

the

fully

clo.:kwise position

the

fulI

tonc

is

obtained

and

as

turned

counterdoch,-ise.

high tones arl!

lessened. Set

it

to

suit

the

particular tona.l con·

ditions

for

the

signal

being

received.

5.11 Beat Frequency Oscillator

Control:-

This

con'

trol

is

normally used for

C\V

code signals.

It

should

be

adjusted

to

give

the

desired audio

pitch

after

the signal has heen accurately tuned.

5.12

Tuning:-For

functions

of

controls sce

the

foregoing paragraphs.

1.

Turn

receh-er

on

and

set

the

Powcr#

Transmit·Receive

Switch for

the

requireJ

type

of

operation.

1.

Set

Range

Switch

for

band

required.

3.

Set

Antenna

Trimmer

for

maximum back-

ground

noise.

"

•

-

•

..

(

'.

...

~ .

_

.....

_-

....

_-

.....

_-

4.

Set Selectivity Switch

for

the

required

operating

conditions

-Sec

Selectivity

Cun:\:s

-

Figure

1:::.

5.

Set

Noise

Limiter-AVC

S\yitch for

the

required

operating

conJitions.

6.

Set

R·F

Gain

Control

fully clockwise.

7.

Set

Audio

Gain

Control

about

halfway.

8.

Tune

in

the

station.

9. Reset

Audio

Gain

Control

to give dcsirc:J

volume.

10. Reset Selectivity

and

Sensitivity

(R·F

Gain)

Controls and

Noise

Limitcr

Control

in accordance

with requirements

due

to in-

terference, station transmission,

and

other

.-

......

:..

canditions. •

11.

Set

Tone

Control

for

preferred

tone.

12.

On

CW

(A-I)

operation set

Power·Trans·

mit-Receive Switch to ·'Rec.

CW"

(position

4)

and

set

BFO

Control

to

give desired

pitch.

When

a

strong

CW

signal

is

being

received,

it

is

necessary

to

retard

the

R.F.

Gain

Control

to

reduce

the

volume.

, :

.....

-.:...:.---

..

-.~

..

-

...

13.

If

the

re":CIya

is

5uhJc(t

tt..) nt--r.lth'J'i.

ch..:

tuning

may

be locked

by

turning

c1od,wi~

tht.:

knurled screw directly

heneath

the

tun

l

ing

knob.

Turning

the

screw moderatel}'

tight

will lock

the

tuning

.

S.13 Diversity

Reception:

-Provision

is

made

to

operate

two'

or

three

of

these receivers

together

for "diversity" reception

..

For

this

typ~

of

r-ecep-

tion

the

A.V.C. circuits

of

the

receivers are tied

together.

The

receivers are

operat~d

on

separa(l"!

antennas,

and

the

receiver receiving

the

strongc.5t

signal,

thus

generating

the

greatest

A.V.C.

volt-

age. dominates

the

other

receivers.

If

the

separ

l

ate

antennas

are

f~es!.

.~.o

~t_he

.incoming signal

at

different angles,

the

good reception \virh mini·

mum fading results.

Refer

to

Figure

3:

Connect

togt::ther

the

ter-

minals, marked '"Diversity"

of

the

receh·ers.

and

equip eaeh receiver

with

a separate

antenna.

Tune

each receiver

to

the

same station

as

ex-

plained in Section 5.12 above.

6.

l\IAINTE.NAc~CE

6.1

This

receiver sh'ould maintain its correct fac-

tory

adjustments

over

a reasonably long period

of

time. Causes

of

trouble

and

the

probable

.sequence

of

their development. are outlined in

the

follOwing paragraphs:

. 6.2

Valves:-A

noticeable decrease

in

the

sensitivity

TABLE

No.

11

of

the

receiver usually indicates

worn

out

valves.

If

the

sensitivity is low, remove

and

check

the

valves in a reliable valve tester or' substitute

new

\'alves one

at

a time. See Schematic' Diagram,

Figure

11.

Valve

socket voltage.s are

gi\Oen

in

Table

11.

V

AL

VE

SOCKET

VOLT

AGES

Plate Screen Cathode Plate

Scre-en

Cathode

Valve Symbol Volt. Volt. Volt. Valve. Symbol Volt. Volt.

VoIL

Type

6SG7

Type

6H6

1st R-F Amplifier

0'-

-"

150 0

2nd

Det. <;

AVC.

S

Type

6SC7

Type6H6

2nd

R-F Amplifier 2 235 150 0

Noise

Limiter 9

Type

6J5

Type

6SJ7

Oscillator 3 110 0 1st

Audio

Amplifier

10

83

34

0

Type6SA7·

Type

6V6GT/G

1

st

Detector

4 235 50 2

Power

output

11

256

240 0

Type

6SG7

Type

6J5

1st I-F

~plifier

5 235 150 7 B.F.O.

12

40 0

Type6SG7

Type

VR-150

2nd

I·F

Amplifier 6 235 150 1.3 Voltage

Regulator

13

150 0

Type

6SG7

Type

5Y3GT/G

3rd

I-F Amplifier 7 235 150

3.1

Rectifier 14 300

NOTE-These

voltages all measured to chassis.

Measured

with

a 1000

ohm

per

volt meter. Variations

of

==

20%

may

be

expected due to resistance tolerances, etc.

[9]

•

..

kill'.

a.

..

_SJ;;"A4

3.

ilsr.

£

-:

•...

6.3

Range

Switch:-A

switch may operate defec·

tively

on

certain positions

after

long periods

of

inct',,:ratifln.

U5U;J.1!y

rotating

the

~wjt..:h

hack

and

forth several times will clean

the

contacts

and

operation will h:.:omc normai.

A

bad

range-switch

contact

is likely to cause a

change

in

the

sensitivity

of

the

receiver,

or

the

frequency

of

a received· signal, as

the

switch is

moved

back

and

forth

.::lightly

in

a

certain

fre-

quenc)'

hand

position. A

further

check

is

to

turn

the

5v.ritch off

and

on

at.

onc

particular

fre-

quency

band

several times

and

note

the

apparent

sensitivity

of

the

receiver

each

time

the

switch

comes into position.

The

sensitivity should be

the

same each time

and

may be aclequaely judged

for

this

test

by

listening

to

the

receiver back-

ground

noise.

6.4 Circuit

Alignment:

WARNING:-The

Circuit

Ali9nment

of

this

receiver

has

been'

done

very

carefully

at

the

factory,

and

re-

ali9nment

should

not

be

attempted

unless

it

has

been definitely

ascer-

tained

that

the

Circuits

are

out

of

ali9nment.

It

should be'

attempted

only

by

skilled

personnel.

It

must

be

performed

in

a

test

laboratory

where

proper

test

equipment

is

available.

All

adjustments

must

be

done

very

carefully

and

the

exact

procedure

as

outlined

below

must

b.

followed.

6"';·1

Alignment

Tools:-Spe:cid.!

tooL~

fa:

align'

ment

of

RJF

and

I·F

circuit5

are

prm:ided.

The)·

are

mounted

in

fuse clips on

either

side

of

the

gang condenser coyer, and

are

a\'aila~lc

after

removing the large

R,P

unit

CQ\'Cr.

Tbe

shorter

onc

of

the

two

is

for

adjustment

of

all

R·F

and

I·F

coils.

and

the

longer

one

is

for adjustment of

the

plunger

type trimmers.

One

end

of

this

tool is for

turning

the

lock

nut

on

the

-trimmers

and

the

other

end

has a hook for

engaging in

the

hole

in

the

end

of

the

plungers.

After

adjustment,

the

lock

nut

should be

sectreIy'

tightened

..

6.4·2

I·F

Alignment:-

The

intermediate

fre·

quenc), is 735 kc.

The

only satisfactory

method

of

I·F

alignment

is

by

means

of

a

sweep oscillator and cathode ray oscillo·

graph.

The

I.F. cir:uits must be ali£ned

at

exactl),

7,5

kc, and

the

frequency-of

the

sweep

os...-il1ator

carrier must

be

checked

against a 735 kc. crystal oscillator.

Make

connections as in

Table

III

(a),

and follow

the sequence as in

Table

III

(b).

TABLE

No. m

(a)

I.F. ALIGNMEI'<'T

CONNECTIONS

Oscillograph Connections .Vertical

"HI"

to

Terminal

C

on

last

I·F

Transformer

(L'47, L-48), Vertical

"LO"

to chassis.

Dummy

Antenna

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

..

...

.Insert

in

series

with

g~nerator

output, 0.01 mfd.

Connection

of

Generator

Output

Lead

...

Connection

of

Generator

Ground

Lead

..

Position

of

Range

Switch .......................

See

Chart

below.

..

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

.To

Chassis.

.

...

Band

No.

I

Position

of

Power-Transmit-Receive Switch ... Position 3 (Rec.

Mod.)

Position

of

R-F

Gain

ControL

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

..

.........FuU)'

cloch,;;c.

Position

of

Selectivity

Switch.

..

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

..

..........Position 2.

Position

of

Noise Limiter

and

AVC

Switch

..

Position 4

(AVC).

Steps

1

2

3

4

TABLE

No.

m

(b)

I.F.

ALIGNMENT

AD]USTMEr-.'TS

(Alignment

Frequency

is

7H

Kc)

Generator

Connections

6SG7·

3rd

I-F

Grid

6SG7 •

2nd

I-F

Grid

6SG

7 - 1st I-F

Grid

6SA

7 - 1st Det.

Grid

Slug

Adjustments

(See Fig. 4)

L·47, L·48

L-4I, L·42, L-43, 1.-44

L·35, 1.-36, L·37, L·38

L-32, L-33

Trimmer

Function

4th

I·F

Transformer

3rd I-F

Transformer

2nd

I·F

Transformer

1st

!-F

Transformer

6.4-3

Align

each

transformer

to

give a symme-

trical flat·topped curve

on

the

oscillograph.

Before performing

step·4

above, set crystal

phasing control C·75

at

approximately

one'

half

of

its maximum capacity.

This

is

ap'

proximately its final setting

and

changing

it

appreciably will slightly

detune

the first

I·F

transformer.

.

[10]

\Vith

Selectivity Switch

in

Position 2

the

I·F

band

"

..

idth

is normal

without

over·

•

..

(

,

•

coupling in

the

transformers.

\Vith

Selec-

tivity

Switch

in

Position

1,

the

second

and

durJ

l·F

TrJ.nsfQrn~..::rs

ar..:

,;

.....

p;:;.nJ\,;":

<LllJ

\..1\".::r-couplcu.

It

i~

\\'dl

in g'oing th:-ough

tht

a.lignment

steps

outlined abO\:e to check

the

I·P curves

on

the

oscillograph s.:reen

with

switch

in

Position

1

to

see

that

the

cun-c5

expand

symmetrically.

6.4-4

Adjustment

of

Crystal

Phasing

C~:mtrol:

This

adjustment

is

best made

by

means

of

a signal

generator

and

a

high

resistance

sensitive

DC

voltmeter. Place Selectivity

Switch in Position

3.

Connect

the

gener-

ator

to

the

grid

of

the

6SA

i first det.,

and

the

Voltmeter

to Terminal C

on

last

l·F

transformer

(L-47, L-48).

Tune

the gen·

aator

to

about

7 k.c. off

l,F

resonance

and adjust

the

crystal phasing control C·7S

for

minimum

response.

If

C~75

is adjusted

much from its position as

{n

Section 6.4-':"

check alignment

of

first I.F.

transform~r.

6.4·5

Adjustment'

of

Crystal

Load

Circuit:·-

Mako connections

as

listed in

Table

HI

(a).

(a) Place Selectivity switch

"in

Position 3.

Rock

the

signal

generator

frequency

back

and

forth

across

the

I~F

resonant

frequency

and

adjust

th.: crystal

loa.d

circuit

trimmer

L·~4

or

srmme~

trical

round~top

curve.

(b)

Place

the

Selectivity

,witch

in Posi-

tion

4,

Rock

the

signal

generator

frequency and adjust

trimmer

C·S

I for

symmetrical

curye.

(c) Place

the

Selectivity

,witch

in Posi-

tion

5.

Adjust

trimmer

C·~O

ro..::king

the

signal

generator

as

for

(a) amI

(b)

above.

The

above

three

adjustments

are

very

critical

and

must be

made

carefully to ob-

tain

symmetrical

curyes.

6.4-6

Adjustment

of

Wave

Trap:-A

wave

trap

is connected across

the

No.

3

band,

first

R.F. primary

to

increase

the

rejection

of

I-F signal frequencies.

With

the

range

sv.itch

on

Position

3,

apply a modulated

I-F signal

to

the

antenna

and

grounJ

terminals.

Adjust

the

wave

trap

trimmer

L-57 (See Fig. 3)

for

minimum output.

The

wave

trap

should

be

adiusted

beior.;

the

final R-F alignment on

N;'.

3 band,

or

the

R.F. coil

alignment

mar

be

affected.

6.4a7

R·F

Alignrnent:-·A

signal

generatqr

cm!-

ering· a range from 70

to

350 kc and

1.5

to 30 megacycles,

and

an

output

volt-

[ll}

..

_._.-----

.:

..:.

.........

;~.

meter, are required.

It

is

d.:sirabk

to con·

nect

a speaker across

the

output

terminals.

Tl-•

.:::

0Utput

\'oltmctcr

should thc-n

be

con-

nc.:tcd across

the

srcakcr

\·oi..:-.:

.:oil. The-

outFut

Impedance is 2.5 ohms.

Rcmo\'e

the

CQ\'er

from

over

the

R·F

unit

by

loosenin~

th~

four

knurled scre'\vs

and

lifting

olf.

Reier

to

Figures

~

~nJ

4.

l-.1ake

connections

as per

Table

IV

(a),

Align

the

R.F. circuits

carefully', follo\ving"

the

procedure

as in-

dicated in

Table

IV

(b).

Always

align

for

maximum

output.

A correctly aligned re-

ceiver should

ha

....

e

performance

equivalent

to

that

described in Section

3.

Replace

CO\'er

.

after

alignment

is

completed.

6A-8

Adjustment

of

Beat

Frequency

Oscil-

lator:-Tune

in a signal

either

R·F

or

I·F

to

exact resonance

with

Power-

Transmit-

Receive

Switch

at

"Ree.

Mod"

(Fig.

I.).

Turn

on

heat

frequency

oscillator

by

turn-

ing

switch to

"Rcc.

CW".

If

:ero

beat

does

not fall

"ithin

the

range

of

the

BFO

con·

trol.

adjust

BFO

Trimmer

L·1:

(see Fig.

4)

until

::ero

beat

occurs at the

mid~point

setting

of

the

BFO

control.

6.5

lvlechanical

Construction:-

6.5·1

The

rccei,'cr

has

been

designed

to

be

very

rugged

so

that

it

-will

_stand

up

under

severe conditions

of

use,.

and

ye~

have

all

parts available

for

easy ·replacement.

All

component

parts

such as transformer.::.

chokes, filter

and

by·pass capacitors, etc.,

are

mounted

with

scrc'ws

and

nuts

rather

than

with

rivets.

All

wiring

other

than

that

invoking

high

frequency

circuits

is

made

up

in

the

form

of

a laced cable so

that

no

loose leads

art::

left floating which

might

cause damage

or

change

capacity

to

yariou5 portions

of

the

circuit. Thl;:

tuning

condenser

is

mounted

50

as

to

be

rigiJ

with

respect

to

the

tuning

unit,

and

yet

is

flexible

with

respect

to

the

chassis.

This

prevents

distortion

of

the

chassis from

having

anr

appreciable effect

on

the

sta·

bility

of

the

oscillator.

6.5·2

The

R~F

unit

which

consists

of

the

tun-

ing condenser,

tuning

unit,

range

switch.

and

all

of

the

R-F

and

oscillator coils

and

trimmers.

is

mounted

on a

separate

base

which bolts

to

the

main base.

The

various

coils

and

trimmers

on

this base. may

be

easily replaced

by

means

of

a single

nut

\vhich scre

.......

·s

on

the

individual

mountin~

bushings.

However

if

a ma.jor

repair

is

tu

(Con!1l1uc-d

on

ptlge

1-4)

".

•

.'

•

'.

.,

..

TABLE No.

IV

(a)

R.F. ALlGNME!,;T CONNECTIO:"'S

~

_,17

Output

Meter

Conncctioi15

Dummr

Antenna

Generator

Modulation

Position

uf

Tone

Control

Position of

Antenna

Trimmer

Position

of

PowerlTransmit~Receive

Switch

..

,

Position

of

Range

Switch ...

~

...

..

Position

of

R·F

Gain Control .........

Position

of

Audio Gain Control

Position

of

Noise Limiter and A

VC

&Witch

Position

of

Selectivity Switch

(..:

-.I"

l!Iorro_)

L.-J~

C,t.-.I.r

4()rrt:lH)

L.

-~"

Cl.-3i!

""""""""')

,,-"'s-

I

L-~tO

•

."

#AA'P

.UIS'

A:'C'.

L,'3

',~(I

-#

......

,0

.(r~'c

~.13

,

~·~I

•

..f_"~

.:tr<J,,'C".

C-7S"

("'JI'JrAL

,,*_J/N#"

C"t:M'T~t:

~-'J'

~

~-'4"

.t!'

.....

""

"".r,t:".

Acruss

I spea.ker

voke

coil

"

r:o-",

.......

4AH~

v.

~t:lg.rr.

c-~_

-.:14"""".17

"fI,.?fd

K'C

L-<!"7"

L-.?'~

-_4A",";

"!

#-(7"

c..,t:~

..

.,..,-.",

/./.

""(7

~C.

c-."

•

...

IAN.:>

~

.i'fd"~

o!-/7

.,.

t:~/4

...

."...""

,-"<1O'C'.

C"-4"

4""

4_~

//..:Jt)~

.rc.

Sce Table

IV

(b) below

.

30~~

at

-wo

cyCles

...

Fully clockwise

See Table

IV

(b)

below

Positi<;n 3 (Ree.· Mod.)

Sec Table

IV

(b) below

Retard to reduce noise

Fully clockwi..::

..

Position 1 (Manual)

... Position 2

~·s_

._

4_~

-er;

.!'sa

,r-c.

~_J"

-.:r'-'-b

Po

JJOD

~C.

C-~?

-r

~p

"'.

fa"

.re

L-.s-~

--~

8A_,::1

/',

ODO"yCo

C"~.4t!'

-to

4_';

jO,

$"oorC"

L-~J~~·~.

..

/,,~~

""~~

~L~.:IO

.$

__

':;;

A<';/J"t7

,~

C".~G

-..1"

4A.Y~

/3,

""0-,",<

Figure

4.-Gener.a1

Purpose

Communications

Receiver-Alignment

Layout

.

[1~]

:

..

' .

.'

•

'.

,.

p . _ . . .

..;.

1·-

.

~.-.-

._--

-----.-_

. ;

.•

"'--_

...

·r!;.·

______

-=

__

.

.-

.:,:""",

Oper'

atlon

No.

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

21

22

23

24

*25

26

27

28

29

.

30

*31

32

33

34

35

36

TABLE No.

IV

(b)

R.F. ALIGNMENT ADJUSTMENTS

Range

Switch

Posi-

tion

Po~ition

of Dial.

and Generator

Frequency Dumm}'

Antenna

1

74

700 mmf

1 200 700 mmf

P05itioa of

Antenna

Trimmer

T:i.=lm.::r

Ad;wt-

r:.<!ots

for

Mu.

Peak Output

(See

figu:oes

1

and

4)

Lo51

C·16

Trimmer

Function

Low

end

OSC.

High

end

osc.

Repeat 1 and 2 until end frequencies are as indicated.

1 195 700 mmf Max.

output

1

80.

700 mmf

Untouched

Repeat

...

and 5 until circuits remain

"in

alignment over the band.

C37,

C59

1st &

2nd

R·P

L.2, L·14, L·24

·Ant.

& 1st and

2nd

RjF

. .

2 200 700

mmf

2 545 700

mmf

Lo52

C·19

Low

end

osc.

High

end

osc. .

Repeat 7 and 8 until

end

frequencieS' are

a.

indicated.

2 500 700

mmf

Ma:<.

output

C·

38,

060

1st &

2nd

R·F

2 205 700 mmf Untouched

L'4,

L·16, L·26

Ant.

& 1st and

Repeat

10

and

11

until circuits remain in alignment over

the

band. 2nd

R·F.

3 1,500 200 ohms

3 4,350 200 ohms

Repeat

13

and

14

until

end

frequencies are as indicated.

3 4,250 200

ohm.

Max.

output

3 1,600 200 ohms Untouched

Repeat

16

and

17

until circuits remain in alignment oyer the band.

4 4,300 200 ohms

4 12,100 200 ohms

L·53

C-2:!

C41,

C·64.

L·6, L·19, L·29

L·54

C25

Repeat

19

and

20 until

end

frequencies are as indicated.

4 11,900 200 ohms Max.

output

C·39, C·62

4 4,400 200 ohms Untouched L·8. L·18, L·28

Repea.t 22 and

23

until circuits remain

in

alignment over the band.

5 12,000 200 ohms

5 19,400 200 ohms L·5S

"C27

Low

end

osc.

High

end OSC.

1st &

2nd

R·P

Ant.

& 1st and

2nd R·F.

Low

end

osc.

High

end

osc.

1st & 2nd

R·F

Ant.

& 1st and

2nd R·P.

Low·end osc.

High

end

osc.

Repeat

25

and 26 until

end

frequencies are as indicated.

S

19,0"00

200 ohms Max. output

C·4:,

C·66

1st <i 2nd

R·F

S 12,150 200 ohms Untouched L·10, L·20, L·30

Ant.

<i 1st

and

Repeat 28 and 29 until circuits remain

in

alignment over

the

band.

2nd·R·F

.

6 19,100 200 ohms

6 30,400 200 ohms

Lo56

c·n Low

end

osc.

High

end

osc.

Repeat

31

and

32

until

end

frequencies are as indicated.

6 30,000 . 200 ohms Max.

output

C45,

068

1st &

2nd

R·P

6 19,500 200 ohms

Untouched.

L·12, L·21, L·31

Ant.

& 1st

and

Repeat

34

and

35

until circuits remain in alignment over

the

band.

2nd

R·F.

*NOTE:

On

all coils, except

Nos.

5

and

6 band

oscillator coils (L'55,

and

L·56) turning

the

core clockwise increases

the

induct·

ance.

On

the

above two mentioned

coils,

turning

the

core clockwise de·

creases the inductance.

.....

'.-

On

all bands

the

oscillator tracks above

the

sig'

nal frequency.

If

more

than

one

peak is obtainable

on

oscillator,

use

the

higher

frequency peak.

[Il]

'~.-..

.

.....

.,"'"

..

"

...

'--<..

......

,.

.......

~."J'.

6.5

Mechanical

Construction(Conllllued

from·

page

J

J)

b..;

ma.Jc

su..:h as

r.:pla..:...:nh.:nt

uf

the

rang

....

s\\.·itch,

it

is

necessary

fir::t

to

remove thL

complete R·F unit from the recei\'er. To

do this the following procedure should be

observed:

(a.)

Remove the chassis and panel

from.

the cabinet

by

removing the four

panel mounting screws and sliding

the chassis forward out

of

th"

cabinet.

(b)

Remove the knobs

by

means

of

th"

small wrench held in

the

spring clip

on

the

right

hand

side

of

the chassis.

This

wrench fits the set screws in

all

knobs except

the

main tuning

kno~.

For this knob use an ordinary small

screw driver.

(c) Remove

the

panel

by

remo,·ing the

eight nuts with which

it

is

held

to

the support brackets.

(d) Remove the large

co.er

from

the

top

of

the

R-F unit, by removing

the

four

knurled nuts with

which

it

is

sup'

ported.

(e) Remove the small cover from the tun-

ing conpenser.

by

removing

the:

eight knurled nuts

with

which it

is

supported.

(f)

Remove the dial light sockets where

they are clipped on to the tuning unit.

(g) Remove the antenna trimmer shaft

extension by loosening set

s..:re\\.'

in

coupling with same wrench

as

used

above for knobs.

(h)

Remo,·e support bracket from

fly-

wh"ei tuning shaft.

(i) Remove main dial, vernier dial. and

[14]

flywheel by loosening set

5crC\"'s

with

same wrench

as

used for knobs.

(j) 'Disconnect the eight leads which con-

nect the R·F unit to the main hase.

These

leads

arc as

follows:-

(if

Two

on the antenna terminal

board--(blue and black).

(ii)

Onc

on number 7 pin

oj

the

6V6GT

IG

output

valve

(brown).

(iii)

One

on tcrminal E

of

the

crystal load cireuit (yellow).

(iv)

One

on terminal E

of

the

first

I-F Transformer

(red).

(v)

One

on terminal F

of

the first

. I-F Transformer (blue).

._.(vi)

One

on pin 6

of

the

second l-F

valve (green).

(vii)

One

on

7

of

the

second I·F

valve (brown)_

In

addition,

the

by-pass condenser

wrueh grounds

to

the

R-F

unit

near

the

second I-F valve must ·be dis-

connected.

(k) Remove eleven screws which hold

R-F

unit

to main base.

Three

of

the>e

arc on under side

of

chassis

along

the

front edge.

The

other

eight ar< re-

moved from

the

top

..

(1)

The

R-F unit may now he rcmo,·eu

from

the

bottom by lifting

ur

first

th"

rcar

of

the R-F

unit

and sliding it

hack

out

of

the

opening.

After

the

unit has been repaired it may

be

r~·

assembled

by

follovdnl! the above

procedure

in

reverse order.

..

(

...

-

',.

•

,-

•

Schematic

Reference

A·l

C·l

C·2

"'C-3

C-4

C·5

·C-6

C·9

C·ll

C·12

.~:-

-

TABLE

NUMBER

V

PARTS

LIST

C;ENERAL PURPOSE

COMMUNICATION

RECEIVER

Nomen.

DESCRIPTION

RCA

Victor

:

~t:;,:l'

R.C.A.F.

__

d_atu_r_e

___________

---,-_:_------------------

__

M:...;,.f,:";.'

.:.N;,;o.:..--,I

Spu.s

;

__

R_o1_._N_O_'-j

Crystal

735

KC

Cryst.1

&

C.....

MI.19454.2!

1 i

10Xln5

Condenser

4700

mmfd.

:!:

10~,

500V,

(mica)

102899·507

I 3 '

10C:8102

~~~:~::~

~02!1~m~~~.

p~~~.~

..

~~~~nn~

..

~.~~.~.~~

...........,

..

,

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

, .

253132·2

( 1

lOC/8121

Condenser

220

mmfd.

:!:. 10'l'(,

SOOV,

Temp.

Coeff. -

.00075

mmf./mmf.rC:

90581·341

:2

10C:SQ86

Condenser

Same

as

C-4. .

~~~:~::~

~08~~

·i()~;;:'·si)OV~'·T~~p:·C~fi··=·:ooo·jS"·~j~~fJ.;CI

Condenser

Same

as

Cl

..

Condenser

56

mmfd.

±

10(,""(",

SOOV,

Temp.

Coeff. -

.00075

mmf.!mmf.rC

Condenser

U

ondenser

Condenser

(mdenser

:

Condenser

I

Condenser

(ine.

in

L-5"1). ............ .................,.'

Same

as

c.4..

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

Same

as

C-4...............

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

47

mmfd.

±

5~",.

SOOV,

Temp.

Coeft'. -

.00015

mmf./mmf.rC

Air

trimmer

2.20

mmfd...

. .

....

,.......

68

mmfd.

:::

S'7c,

SOOV.

(mica)

..............,.......................................

39

mmfd

.....

Sf;'I-,

500V,

Temp.

Coe:l.

-

.00012

mmf./mmf./~C

Air

trimmer

2-12

mmfd......

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

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

.

240

mmfd.

±

50/0,

SOOY,

(mica)..

.

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

.

15

mmfd.

±

So/c,

500V,

Temp.

Coeff. -

.00047

mroiJrnmf.rC.

Air

Trimmer

-

Same

aa

C·19

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

.

1000

mmfd.

±

51/",

37SY,

(mica)

2500

mmfd.

±

So/c,

SOOY,

(mica)

I

Air

Trimmer

-

Same

as

C·19

.

Same

as

C~21....

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

"1

Air

Trimmer

2~2'5

mmfd.

.....

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

.

3000

mmfd.

::t:

5%,

500V.

(mica)

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

.

30

mmfd.

±

S~1(,

SO(fV,

Temp.

Coef!'. -

.00047

mmf./mmf./cC

3900

mmfd.

:1:

S~.

SOOV.

(mica)

I

39

mmfd.

:!:

5~(.

SOOV;

Temp.

CoeH. -

.00041

mmf

..

:mmf./cC

i

905S1·309

1

90581·327

90577·225

1

95534·502

2

72053B·39

I

90574·223

1

95534-503

1

720538·32

1

905S0·213

1

721133-4

1

721133·24

1

95534·501

2

721133·12

1

90580·220

1

720538-46

I

1.

90580·223

.• 1

lOC/80S7

10C/S093

10C/SllS

10C/8ll1

toC/B092

IOC/8ll9

10C/8105

10C/8094

IOC/8ll4

10C/8116

10C/8120

toC/8llS

IOC/8099

10C/8112

10C/809S

C·l3

C·14

C·15

C·16

C·17

C·18

C·19

C·20

C·21

C22

C·23

C·24

C·25

C·26

C·27

C2B

C·29

C.30

C·31

C32

C·33

C34

·C·35

C36

C·37

C3B

C·39

C:C-40

I

Condenser

-

-'-1

1

Condenser

I

Condenser

i

Condenser

~~~r!:C.e{.~.~.~~.~

..

~~.~~~~.::

................,....,

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

,.,....... :

..

1

ll;l§:~iii£~~i~.~~ie~).·

...

·.·

..

···

..

·

...

·

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

I 9B041·1 I

lOC/8100

C-41

C-43

C·44

C-45

C-46

C-47

C-48

·C-49

·C·50

C51

C52

C53

C54

C·55

C.S6

C57

C58

C59

C-60

C-61

C-62

C-63

C·64

C-66

C-6i

C-68

C-69

·C·70

C-71

cn

C.73

C.7S

C·76

\

Condenser

I

Condenser

1

Condenser

j

Condenser

,

Condenser

.\

Condenser

•

Condenser

I

Air

Trimmer

-

Same

as

C~16..

..... I

Air

Trimmer

-

Same

as

C·16

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

8·128

mmfd...

. .... .......... '. i

Air

Trimmer

-

Same

as

C~16..

.... .............. . I

Air

Trimmer

-

Same

as

C·27

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

I

6.8

mrofd.

==

10(,(,

SOOY.

Temp.

Coeff. -

.00075

mmf.!mmf.rCI

Air

Trimmer

-

Same

as

C-27..

. . . .................... . \

~:::

:5

5

c:i~.~·

.

:::

'.:::::

.:::::

.....

:::::::::

:::'.::::

::.'.::~:

...

:::::::

'.'.:

'.:'::::

,I

.05

mfd.,

400V,

(oil

filled)

(C·48,

C·109,

C-UO.

in

one

assembly):

~O:~~Om::!Id.

.

..

·

..

·....·..1

Same

as

C·l..

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

Same

as

C-l..

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

Same

as

C-44

..... .

Same

as

C-l

......,......... ...... .....,...................................

390

mmfd.

±

Slfi-.

SOOV,

(mica)

(included

in

T~3)

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

.01

mid.,

400V.

(oil

filled)

(C-56,

C~76.

C-93,

in

one

as.sembly)

....

Same

as

C4

...............................................,.................................,........

Same

as

C-36..... .......................

Air

Trinuner

-

Same

as

C-16... .............. ................. ....................

.1,

Air

Trimmer

-

Same

as

C-16........ . .................

Same

as

C-9

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

Air

Trimmer

-

Same

as

C-16

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

..

Same

as C·I.................................... . ..................

Air

Trimmer

-

Same

as

C·16

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

Air

Trimmer

-

Same

as

C-21................................. ..............

22

mmfd.

==

10'li-,

SOOV,

Temp.

Coeff. -

.00015

nunf./mmf./:C.

Air

Trimmer

-

Same

as

C-27

....."...............................

Same

as

C46....

..............,..........................................

8·12S

mmfd.

...

......

...

..

......._................

..

U.l

mfd.,

400V,

(oil

filled)

(C-71,

C-95,

C-I02,

in

one

assembly)

I'

Same

as

C-SS

(included

in

T·3)

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

100

mmfd.

±

5'70.

500V.

(ine1uded

in

T-4)

(mica)

..

3-15

mmfd.

Crystal

Pha!l~g

Trimmer

.01 mId.

400V

(lee

C·56)

. .

[17]

905S1·305

1

98034·1

86079·505

98034-4

90581·317

98034-2

86034-522

253132-6

1

10C.·8088

10C'S083

10C/80S4

lOC.·8090

IOC/S085

IOC'8123

.-

SchematiC

Rlderenee

'::C·7i

C-78

C-79

C·SO

C·81

C·82

C-83

C·84

C·85

C·86

C-S7

C-88

C·89

C·90

C-91

C·92

C·93

C-94

C·95

C·96

C·97

C-98

C·99

C-IOO

C·IOI

C-I02

C-I03

C·I04

C·I05

C·I06

C·I07

C·IOS

C-I09

C-110

C-lll

C·1l2

C-1l3

C·1l4

C-II5

C-1I6

C·II7

C-llS

C·1l9

C·121

C·122

C·123

C·124

C·125

C·126

C-127

C-128

C·129

C-130

.,

NOTE:

F-1

J.I

J.2

L-1

L-2

L·3

L-4

L-5

L-6

L-7

L-8

L-9

L-IO

L-II

L·12

L-13

L-14

L·15

L-16

TABLE NUMBER V - PARTS LIST

rContinuedl

Nomen-

DESCRIPTION

ReA

Victor

~h"

of

clature

Mf!!:;.

No.

s

......

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

---==::.-.:..:.:;-

-~~

Condenser

Ccndenser

Condenser

10·370

mmtd.

Same

as

C-SS

(included

in

T.5).

0.1

mid

..

400V,

(oil

filled)

(C-79,

C-84.

C-92,

in

one

assembly)

Air

Trimmer

-

Same

as

C-16

._._

.... ",., ".

_"

..

,.,

.__

""

..

Air

Trimmer

-

Same

as

C-16

.

56

mmfd.

::::

5'"

SOOV,

(mica,)

(included

in

T-IO)

Same

as

Col

0.1

mfd

..

400V,

(See

C-79).

330

rnmfd.

::t:

20';,

SOOV,

(mica)

(included

in

T-IO)

3-15

mmfd.

B.F.Osc.

Panel

Trimmer.

1500

mmfd.:!:

10(;"

SOOV.

(mica)

(included

in

T-IO).

Same

35

C-82

(included

in

T-IO)

Same

as C-5S

(iniluded

in

T

-5)

,.

Same

as

C·S5

(included

in

T

-6J.

Same

as C-5S

(included

in

T

-6)

0.1

mfd.,

400V,

(See

C-79).

0.1

mid.,

400V,

(S

..

C-56)

Same

as

C-S5

(included

in

T-7)

..

0.1

mfd

.•

400V,

(See

C-71)

..

.~'

..

.

.. ..

I

.

····1

....

1

.

..........

I

.....

.......

i

Condenser

4

mfd.,

+

20~;'i:

-107c,

Dry

Electrolytic

(C-96,C-97,C-98

in

one

assembly)

...i

Condenser

4

mfd

..

+

20

f

;.

-10'7;',

Dry

Electrolytic:

(See

C-96)

.

I "

Condenser

. 4

mfd.,

-:-

20~'~

-10'7<,

Dry

Eleetrolytic

(See

C.96)

. I

Condenser

.25

mfd.,

400V.

(oil

filled)

(C-99.

C·U2,

C-113,

in

one

assembly)

I

Condenser

Same

as

C·S5

(included

in

T-7).

..... ......... . !

Condenser

Same

as

C·SS

(included

in

T

-8).

Condenser

0.1

mfd

..

400V,

(See

C·7!") ........... ..... ......... .

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

.

Condenser

.05

mid

..

400V,

(oil

filled)

{C-ID3,

C-ID6,

C-ID7,

in

One

assembly

Condenser

Same

as

C-55

(ineluded

in

T

-8)

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

Condenser

560

mmfd.

±

10r(.

SOOV,.

(mica)

.....

Condenser

.05

mid

..

400V,

(See

C-I03)

Condenser

.05

mid.,

400V,

(See

C-I03)

Condenser

Same

as

C·73

(included

in

T-9)

...

Condenser

.05

mid.,

400V.

(See

C-48).

Condenser

.OS

mid.,

400V,

(See

C-48)

'''1

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

,

Condenser

2700

mmfd.

± 10'-"

SODV.

(mica)

Condenser

.25

mfd

..

400V.

(S~

C-99)

Condenser

.25

mfd

..

400V"JSee

C-99)

Condenser

Same

as

C-73

(inl:luded

in

T-9)

..

Conden!oer

180

mmfd.

± 5r

;.,

500V,

(mica)

(included

in

T-9)

Condenser

Same

as

C-Ill

Condenser

Same

as

C-l..

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

Conqenser

Same

as

Col

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

.

Condenser

.003

mfd.

--

10',.

1000V,

(.oil filled)

Condenser

Same

as

Col

Condenser

Same

as

C-l

Condenser

Same

as

C-4

Condenser

150

mmfd.

=

10'~.

SOOV,

Temp.

Coeff. -

.00075

mmf./mmf./°C

Condenser

650

mrnfd.

±

10'

(,

300V.

(mica)..

.

Condenser

Same

as

C-12S

Condenser

Same

as

C~20

Condenser

285

mmfd.

=5'.1,

500V,

(mica)

Ccndenser

Same

as

C-9

Condenser

Same

as

C-ID5

... .

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

.

C·l,

C.6,

C·lS,

C·40, C·44.

C·SO,

C·70,

C-77,

all

part.

.f

Fuse

Socket

Jack

Coil

(V~~~aa~~.;O~d~~si:r

A~'~::I.y

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

..

"1

1

Connection.

for

battery

operations

............... ................... "'1

Jack,

phone

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

..

..........1

Antenna

Prim.

73-205

KC

(L-l

&:

L-2

on

same

coil

form)

"

Antenna

Sec.

73-205

KC

(See

L-l).

..

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

·.1

Antenna

Prim.

195-550

KC

(L-3

&

L-4

on

same

coil

form)

:

Antenna

Sec.

195-550

KC

(See

L-3).

......

........

......i

Antenna

Prim.

1~80-4400

KC

(L-S

&

L-6

on

same

coil

iorm)

i

Antenna

Sec.

1~S0-4400

KC

(See

L-5).

Antenna

Prim.

4250-12150

KC

(L-7

& L-S

on

same

ceil

form)'"

i

Antenna

Sec.

4250-12150

KC

(See

L-7)

...

Antenna

Prim.

11900-19500

KC

(L-9

&:

1.-10

on

same

coil

form)

Antenna

Sec.

11900-19500

KC

(See

L-9)

Antenna

Prim.

19000-30S00

KC

(L-ll

&.

L-12

on

same

coil

form)

Antenna

Sec.

19000-30500

KC

(See

L-ll)

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

.

1st

R.F.

Prim.

;3-205

KC

<L-13

&:

L-14

on

same

coit

form)

1st

R.F.

Sec.

73-205

KC

(See

L-13).

1st

R.F.

Prim.

195-550

KC

(L-15

&

L-16

on

same

coil

form)

...

1st

R.F.

Sec.

195-550

KC

(See

L-lS)

[18]

9S034.2

861)34.517

86034·524

253132-7

86034-54S

72026-515

98034·3

98034·1

100404-528

102899-508

86034-513

251248·3

90581.337

720592·13

720538-31

92444-502

55544-2

421395·509

98965-3

253674-506

253674-507

95521·501

95521-502

95521-503

253671·505

253674-501

253674-502

I

1

8

2

R C.A.F.

Re{.

No.

lOC/8085

IOC/SI24

IOC/8081

IOC/S082

'.

10C'8083

IOC/8101

IOC/8103

IOC/B1l7

IOC/8091

10c.-S1l3

IOCi8104

IOe/8122

5Cil705

IOH/8168

10H/8185

IOCl

8142

lOC/S143

10C

'S144

IOC.8145

10C/S146

IOC/8147

IOC/8H8

IOC.'8149

•

_l

•

..

Schematic

Refere-nee

Nomen.

c1ature

TABLE NUMBER V - PARTS LIST

IContinued'

DESCRIPTION

ReA

Vietor

W;;::

R.eA.F.

Ref.

So.

_

__________________________

Mfg.

No.

Spare-s

/---------

---'---

--

---

L-17

1.-18

1.-19

r;20

1.-21

1.-22

L-23

L-24

L-25

1.-26

1.-27

1.-28

1.-29

1.-30

L-31

1.-32

1.-33

1.-34

1.-35

1.-36

1.-37

L-38

1.-39

1.-40

1.-41

1.-42

r;43

1.-44

1.-45""

1.-46

1.-47

1.-48

1.-49

1.-50

1.-51

L-52

1.-53

1.-54

1.-55

1.-56

1.-57

L-60

1.-61

P-I

P-2

R-I

R-2

R-3

R-4

R-5

R-6

R-7

R-9

R-IO

R-l1

R-12

R-13

R-14

R-15

R-16

R-17

R-19

R-20

R-22

R·:23

R-24

R-25

R-26

R-27

R-28

R-29

R-30

R-31

R-32

Coil

Coit

Coil

Coit

Coil

toil

Plug

Resistor

R,esistor

Resistor

i'

Resistor

..

.

..

1st

R.F.

Prim.

4250-12150

KC

(L·17

&

L-lS

on

same

coil

(orm)

1st

R.F.

Sec.

4250-12150

KC

(See

L-17)

1st

R.F.

Sec,

1480-4480

KC

(L-19

& L-61

on

same

coil

form)

1st

R.F.

Coil

11900-19500

KC

lst'

R.F.

Coil

19000-30500

KC

B.F.

Dsc,

Coil

(See

T-10)

2nd

R.F,

Prim,

73-205

KC

(L-23

&

L-24

on

same

coil

form)

2nd

R.F.

Sec.

73-205

KC

(See

L-23).

2nd

R.F.

Prim.

195-550

KC

(L-25

&

L-26

on

same

coil

form)

2nd

R.F.

Sec.

195-550

KC

(See

L-25).·

2nd

R.F.

Prim.

4250-12150

KC

(L-27

&

L-28

on

same

coil

fonn),

2nd

R.F.

Sec.

4250-12150

KC

(See

L-27)

, ... ,

..

,

.........

""."."

..

2nd

R.F.

Sec.

1480-4400

KC

(L-28

&

L-60

On

same

coil

fonn)

2nd

R.F.

Coil

11900-19500

KC,.

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

~.

2nd

R.F.

Coi119000-30500

KC

.

I.F.

Trans.

Prim.

(See

T-3)

..

I.F,

Tram.

Sec.

(See

T

-3)

.

Crystal

Selectivity

Coil

(See

T

-4)

I.F.

Tranlj.,

Prim.

(See

T·5)

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

I.F.

Trans.

Sec.

(See

T-5)

....

..

I.F.

Trans.

Prim.

(See

T-6)

.....

I.F.

Trans.

Sec.

(See

T-6)

..

Variable

Selectivity

Coil

(See

T-5)

Variable

Selectivity

Coil

(See

T-6)

..

I.F.

Trans.

Prim.

(See

T·7).

I.F.

Trans.

Sec.

(See

T-7)

.....

I.F.

Trans.

Prim

.•

(See

T

-8)

..

I.F.

Tral'ls,

Sec.

(See

T-8)

."

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

..

Variable

Selectivity

Coil

(See

T-7)

..

Variable

Selectivity

Coil

(See

T-8)

I,F.

Tuns.

Prim.

(See

T-9).

I.F.

Trans.

Sec.

(See

T-9)

..

Filter

Choke

....

Filter

Choke

-

Same

as

L-49.

Oscillator

73-205

KC

...

Oscillator

195-550

KC

Oscillator

1480-4400

KC

Oscillator

4250-12150

KC

Oscillator

11900-19500

KC

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

Oscillator

19000-30500

KC

..

I.F.

Wave

Trap

(includes

C.12)

2nd

R.F.

Prim.

1480-4400

KC

(See

1,..29)

1st

R.F.

Prim.

1480-4400

KC

(See

L-19)

..

AC

Power

Plug

&

Cord

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

in

J-1

for

normal

AC

operation

..

33,000

ohms

±

10~{

1J2

W...

2.2

meg.

::::

20,;!

1/2

W...

1,000

ohms':::

10{ic

1/2

W.

100.000

ohms

:t:

10(1c-

1J2

W.

LO

meg.

± 20t;(

1/2

W ...

Same

as

R-1............. .............. .

.

330

ohms

±

10%

V2

w.................

..

r

Same

as

R-4..

..

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

..

1

Same

as

R-3..

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

10,000

ohms

::!:

1Of/~

1f2

W.

..

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

,

I

.....

!

,

";

I

·

Same

a.

R-3..

.

........

" .................

····.1

560

ohms::

10%

'(2

Wo..

.

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

::

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

.

Same

as

Roo4

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

·1

,

22,000

ohms.:::

10%"112

W.

(included

in

T-3)....

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

i

Same

as R-3.........

..

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

I,

Same

as

R-7.... ..................

Same

as

R-l..

.

..

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

..

.....

1

!

100

ohms

.....

10

f

ic

1/2

W

..

.

Same

as

R-3

.....

..

560,000

ohms

±

1O

f

:i

'11

w

......

120,000

ohms

lOf

l,

~~

W.

(included

in

T

.10)

...

47

ohms

± 10(ii %

W.

Same

as

R-3

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

..

Same

as

R-23

.

Same

as

R-24

(included

in

T-10)..

..

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

.

47,000

ohms

:::

10';,

1/2

W.

(included

in

T-IO)

!

2.700

ohms

± 10tJc 4 W.

Same

as

R-3

390

ohms

:::-

1O~;,

% w.

[19]

I

.•

~.

253674-508

95520-503

253671-501

253671-502

253674-501

253674-502

253674-508

95520-503

I

2536il-501

253671-502

901433-501

253674-503

253674-504

95520-506

253674-505

253671-503

253671-504

253481-502

,

811638-1

99895-501

850981-80

850981-33

82283-62

82283-86

82283-31

82283-56

82283-74

850981-59

82283-7iI

82283-50

82283-95

82283-87

82283-46

82283-82

90497-3

850981-57

I

1

I

1

I

2

I

1

I

1

2

I

1

loc/al50

IOC/8151

10C.·8152

10C.8153

IOC/8148

10C/8149

IOC/8150

IOC/8151

IOC/8152

10Ci8153

10C&154

10C/S1SS

10C/8156

IOC/8157

10C

'8158

IOC.'8159

10C

'8160

10C

8161

10H8184

10C

8134

10C

8131

lac

'1673

IOC'3281

10C'5750

lOC

'7729

10C/1675

10Cl7259

IOC

'3260

IOC'M88

IOC"7747

IOC/8128

10C

'7282

-

.

TABLE

NUMBER

V -

PARTS

LIST

'Contlnuedl

Schl!:natic

Nomen-

ReA

Victor

,Qt)'.of

I

DESCRIPTION

. N

...

!

I'

R.C.A.F.

Rei.

No.

Reference

clature

Mfg.

No.

Sp.~

----

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

--"---

-'--1'·---1

R-33

R-34

R-35

R-36

R-37

R-38

R-39

R-40

R-41

R-42

R-43

R-44

R-45

R-46

R-47

R-48

R-49

R-50

R-51

R-52

R-53

R-54

R-55

R-56

R-58

R-60

R-61

R-62

R-63

R-64

R-65

R-66

R-67

5-1

5-2

5-3

S-4

5-5

S-6

5-7

S-8.

5-9

5-10

S-l1

S-12

5-13

5-14

S-15

5-16

5-17

5-18

5-19

5-20

5-21

5-22

5-23

5-24

5-25

T-I

T-2

T-3

T-4

T-5

T-6

T~j

T-8

T-9

T-IO

TB-I

TB-2

TB-4

V-I

Resistor

Resi!Stor

Resistor

I

Resistor

!

Resistor

1

Potentiomater

I

Resistor

i

Potentiometer

I

Resistor

I

,

Potentiometer

Resistor

!

Resistor

i

Resistor

!

Resistor

1

Resistor

,

Resistor

Switch

5witclJ

Switch

5witclJ

Switch

S\\,-l.tch

Switch

Transformer

Transfonner

Transformer

Translonner

Transformer

Term.

Bd.

Term..

Bd.

Term..

Bd.

Valve

Same

as

R-2

Same

as

R-3

680,000

ohms

==

10';'{ 1/2

W.

Same

as

R-2

.

LO

meg.

±

20'!,

Vl

W

..

1.5

meg.

±

10%

112

W.

Same

as

R-20

.

270,000

ohms:±:

109(;

"1/::

W.

100,000

ohms

±

10'/",.

1.4

W

..

390,000

ohms

:!:

lOo/<

1f2

W.

100

ohms::::!;:

10%

4 W .....

150

ohms

±

10%

4 W..................

15

ohms

±

10%

~

W......................

66,000

ohms

R.F.

Gain

Control..

Same

as

R·2.

..... .

..

Same

as

R-46

(Noise

Limiter

Control)

Same

.1

R·1

...

Same

as

R·23

..

,

...........

.

2.

meg.

Audio

Gain

Control

1

meg.

Tone

Control...

330,000

ohms:::!:

10%

tAt

W.

2,700

ohms

±

10%

1h

W

..

.

6,800

ohms

±

100/'0

¥2

W

..

.

'39

ohms

±

10%

4 W ....

5,600

ohms:±:

10%

1f:z

W•...

Same

as

R-S8

..

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

Same

as

R·25

..

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

........

····••••••·•··•·••••••••

•••

1

...

.........

i:::::

5:~t

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

···

..

················:1

Same

as

R-23

. .... ............ , ;

Same

as

R-54

I

Same

as

R·S4

I

Range

Sw.

Wafer

Oscillator

Ccts.

(S.1

&.

S-2

on

same

wafer).

~~

Range

Sw.

Wafer

Oscillator

Ccts.

(See

5-1)..

..

Rang.

Sw.

W.fer

Oscmator

Cm.

(S·3

&;

S-4

on

same

wafer)

Range

Sw.

Wafer

Oscillator

Ccts.

(See

S·3)........

.

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

.

Range

Sw.

Wafer

2nd

R.F.

Ccts.

(5·5

&

8-6

on

same

wafer)

Range

Sw.

Wafer

2nd

R.F.

Ccts.

(See

5-5)

..

Range

Sw.

Wafer

2nd

R.F.

Ccts.

(5-7

&

S-8

on

same

wafer)

Range

Sw.

Wafer

2nd

R.F.

Gets.

(See

8-7)

.......

::'1

Range

Sw.

Wafer

1st

R.F.

Ccts.

(8-9

&:

10

on

same

wafer)

...

Range

Sw.

Wafer

1st

R.F.

Ccts.

(See

8-9)

......... . I

Range

Sw.

Wafer

1st

R.F.

CCts.

(5-11

&;

12

on

same

wafer)

..

Range

Sw.

Wafer

1st

R.F.

ern.

(See

S-11).

Range

Sw.

Wafer

Antenna

Ccts.

(S-13

&.

8-14

on

same

'~~i~~)"!

Range

Sw.

Wafer

Antenna

Ccts.

(See

S-13)

....

Range

Sw.

Wafer

Antenna

Ccts.

(S·15

le

8-16

on

same

wafer):

Range

Sw.

Wafer

Antenna

Ccts.

(See

S-15)

..

NOTE:

S·l

to

5-16

includ&d

all

on

one

assembly

....

Crystal

Sw.

WaIer

(5-17

&;

S-18

on

same

wafer)

i

I

Crystal

Sw.

Wafer

(See-

8-17)

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

.

Crystal

Sw.

Wafer

(5-19

&; 5020

on

same

wafer)

..

••.•••.. 1

Crystal

Sw.

Wafer

(See

8-19)

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

..

NOTE:

S-17-18.19~20

all

on

same

assembly

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

A.V.C.

-

N.L.

Switch

Wafer

(8-21

&.

8-22

on

same

wafer)

..

A.V.c.

-N.L.

Switch

Wafer

(See

5-21)

........

Off-Trans.·B.F.O.

Switch

Waier

(includes

S~24).......

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

On/Off

Toggle

Sw.

(5

..

5-23)

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

.

D.P.

D.T.

Line

voltage

Switch

..

Power.

115/230

V.

25-60

cy<le .... .......... i

Output

2.5

ohms

&;

20

ohms...

..

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

...........

/

1st

I.F.

(includes

L-32.

1-33.

C-55,

c·n,

R.1S)

735

KC

I

I.F.

Crystal

Load

(includes

L-34

&;

C-73)

735

KC

:::

I

2nd

I.F.

<Includes

L-35, L-36, L-39,

C-78,

C-89)

735

KC

.........

,'

2nd

I.F.

(Include.

L-37, L-38,

lAO,

C-90,

C-91)

735

KC

.,

3rd

I.F.

(Include.

lAl,

lA2,

lA5,

C-94,

C-lOO) 735

KC

...... 1

3rd

I.F.

(Include.

lA3,

L-44,

lA5,

C-IOI,

C-I04)

735

KC

4th

I.F.

(Includ

..

lA7,

lA8,

C-I08,

C-114,

C-115)

735

KC

....

:

B.F.

O.

(Inc.

L-22,

C-82, C-85. C-87,

C-88,

R-24,

R-28,

R-29)

735

KC'

Antenna

&;

Ground.

3

term

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

5

Term.

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

Ou~utforezternalspk.2ternL

Ist

R.F.

A~ifier

PO}

...--',

850981-96

85MSI-31

850981-100

850981-91

850981-86

82283-93

i

90497-1

90497-6

867970-340

251402-2

251402-3

251402-1

82283-92

850981-67

850981-72

90497-7

82283-71

253660-1

I

253134-1

253099-1

253098-1

I

!

252657-1

1

901602-501

i

901611-501

1

255401-501

i

255401-505

i

255401-5031 i

255401-503l

'

255401-503j

i

255401-503

'

255401-502

255401-504

253669-2

253669-1

253669-3

6SG7

I

1

I

1

I

1

I

1

I

1

I

lOC/8137

IOC/1651

10C!1921

IOC/8136

IOC/8135

IOC/8027

IOC/8127

IOC/8129

IOC/8138

IOC/8139

IOC/8140

IOCl8141

IOC/8126

IOC/8132

IOC/8133

IOC/8130

IOC/8125

10F/8167

IOF/8165

IOF/8166

10F/8163

IOF/8164

IOA/8173

10A/8174

IOA/8175

10A/8176

10A/81;7

10A/8178

IOA/8179

-_..

_-_

..

_---_._-- -

----_

.

......

-,

.....

(

•

{

•

-_.:;.-'-

•

'.

.

Schematic

"10

Reference

V-2

V-3

V-4

V.5

V·6

V-7

V-8

V-9

V-IO

V-1l

V-12

V-13

V-14

V-16

X-I

X-2

X-3

X-4

X-5

X-6

X-7

X-8

X-9

X-IO

X·11

X-12

X-13

X-14

X-16

.~

" -

TABLE NUMBER V - PARTS LIST

IContinuedl

Nomen-

DESCRIPTION

ReA

VNictor

I

W:;::

I R.C.A.P.

_--:c::I._t~u,_e

__

-:--:-:::-::--:---::7

______________________

M_f,;;._'_o_·

__

l~,s,"p"':':"'~'I

__

R_

..

_._N_o_,_~

Valve

2nd

R.F.

Amplifier

65G7

Val

....

e

Master

Oscillator

6J5

,.

Valve

1st

Detector,

'Converter

.

6SA7

6

Valve

1st

I.F.

Amplifier

6SG7

,'f

Valve

2nd

I.F.

Amplifier

65G7

12

Vat

....

e

3rd

I.F.

Amplifier

68G7

Valve

2nd

Detector

& A.V.C. ....... ...... ...........

..

......

6H6--

I

Valve

Noise

Limiter

6H6

10£/8188

8

Valve

1st

A.F.

Amplifier

68J7

Valve

Output.

6V6GT/G

6

Valve

B.F.

Oscillator.

,_............ . ....... .... ........ .

6J5

Valve

Voltage

Regulator..

VR-1S0

8

6

10£/4298

Valve

Rectifier

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

SY3GTIG

6

Valve

Gas

Gap

Protector.

991

4

10£/6827

Socket

Tube

socket

for

V.;

421395-507

Socket

Tube

socket

faT

V·2

Same

as

X·1

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

10H/8169

Socket

Tube

socket

for

V-3 . 421395-508 1

IOHl8170

Socket

Tube

socket

for

V

-4

Same

as

X-3

..

Socket

Tube

socket

for

V-S Sa.me as

J-1

Socket

Tube

socket

for

V-6

Same

as

J-1..

Socket

Tube

socket

for

V-7

Same

as

X-1..

Socket

Tube

socket

for

V·S

Same

as

X-I..

Socket

Tube

socket

for

V-9

Same

8S

X-3

..

Socket

Tube

socket

for

V·lO

Same

as

J-l

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

..

Socket

Tube

socket

for

V-U

Same

as

X-I

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

..

Socket

Tube

socket

for

V-12..

..

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

..

421395.510

1

IOH!8171

Socket

Tube

socket

for

V-13

Same

as

J-1..

.

...........

..

Socket

Tube

socket

for

V-14

Same

as

)-1

..........1

Socket

Tube

socket

for

V-16

..............."...."........!

837884-2

Board,

Resistor

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

98958-1

Board.

Terminal

assembly

2

Way

81641-23

Board,

Terminal

assembly

1

Way......

81641-32

Board,

Terminal

assembly

1

Way

vertical

81641-57

~~~~~~~g

assembly

..

~.~~~

..

~.~~~ng

.~~~~.~~.

:.....

'.1

~~g~g=iOl

Coupling

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

99630-1

Caps

-

Shield

Can.

................... ........................... I

99840-1

Dial

Assembly........................

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

98947-503

r

I

10H

l

81i2

Fuse

Holder

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

844027-2

Knob

(Large)

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

712336-503

Knob

(Medium)

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

712336-505

Knob

(Small)

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

712336-507

MISCELLANEOUS

IOA/8187

SC/1304

10A/8180

10A.'8181

10A

l

8182

C-I

C·2

C-3

C-4

CoS

C-6

C-7

C-8

CP-l

F-l

L-I

L-2

P-I

R-I

S-I

S-2

T-"!

TB-I

V-I

VS-l

X-I

X-2

Lamp

-

Pilot

1J.

Amp.

6V

..

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

61114·15

12

Screw

-

Knurled

Thumb

..

_._............ .................

252664-1

Screw

-

Thumb

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

99610-9

Screw

-

Set

#

8-32

for

small

knob

844365-12

Screw

-

Set

#8·32

for

medium

knob

844365-13

Screw

-

Set

# 10-32

for

large

knob

59101-6

I

Socket

Pi1c:t La:mp

(com~lete)

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

98983-501

l

Tool

-AII'

Tnmmer

Ad).

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

81059-501

\

i::

=

~;t

tc~!~

Wre'n'ch .::.:::::::::.....

..

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

8~~~~t~~1

I

Tuning

Unit

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

92417·1

Vernier

Assembly.....

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

98947·502

TABLE NUMBER

VI

-PARTS LIST -

Vibrator

Power

Supply

Unit

110'11.222151

Condeniier

I 0.5

mid.,

::!:

10

l

;',',

120

volts

·

..

-........i

114125-5

Condenser

,008

mfd.,

==

10<;":"

2000

volts

..

I

114125-6

Condenser

I .05

mid.,

==

10%.

600

volts

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

114125-7

Condenser

I 0.1 mid" ± 10Q",

600

volts.

114125-8

Condenser

I

500

mmfd.,

==

10%.

600

volts

(mica)

.'...

114125-9

Condenser

I

Electrolytic,

10

mfd

.•

450

volts.

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

114125-10

Condenser

!

Electrolytic,

25

mfd

.•

40

volts.

..

. I

114125-11

Condemer

i

Same

as

C-S "!

Cable

Power

Cable,

includes

P-1,

S·1

Fuse

Type

3

AG,

20

Amperes

..

Coil

Filter

Choke

(iron

core)

Coil

I

Filter

Choke.

Plug

8

prong

octal

plug

(on

CP-!)

Resistor

5,000

ohms,

=

10<!e,

1/4

Watt

Switch

ON·OFF

Switch,

D.P.S.T.

(~n

CP-l)

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

..

Switch

i

Voltage

Tap

Switch-Water

type

,

..

Tr",nsiorm.er·, 1

Vibrator

Transformer

'Terminal

Board

Voltage

Terminal

Board.

3

tenn.

.i

Valve

Rectifier

Vibrator

Dual

Contact

Vibrator

Socket

Octal

Socket

for

V-I

Socket

6-Pin

SOCktH

for

VS-l

[21}

107617-501

55544-10

98567-1

114125-2

413691-8

114125-4

845786-3

114125-3

114125-1

114125-14

OZ4A

110112-1

H4125-13

114125-12

SL/7ii

IOD/8IS9

100/8186

IOA/81SJ

-

Figure

6.-General

Purpuse

Cummrul;(:mions

Rf'ceit-er-Rear

1"

ieu.'

•

Figure

';.-Gen~ral

Purpose

Communi('ations

ReceiL'er-Top

VieW

[2j}

-_._-------_.

"1,

"

."",

-.;

--~

'

....

,

.,

.

..

/'

•

:~

, .

.

r-----------------------------------------------------------~----------------------------------

...

r

.~

.f'.

l.r!:.-

"!

~:-

~-

.,

,

r

j~

Ut

f

r.

,

C40

C':'C:;,C!J7

C<o

z

'-..

.

~.s67 C.J{J

1/1

.~~

5Y3GT

L/~t.I',

-V14

C"Il~35

\

C<I-~

~~

~3_::~

~:""~""'~"'~'1

~~I:J~~~~~~

t.cZO

C45

C~7

Ltl

U7.a8~

"

eGG

______

~

£30

Z,.

l2d

CS"

C70

·CC.4

C77

C:3~

LSI

Lse;

elt;,

C<I-!'

CZ7

~

Ji!5Z

• C,St).

'.-1..::'<1-

C7~

73

L..3-'

~,~

..

L.3Z(~(;Tj

C.

Tt!

C!;.5 R

,=

Figure

B.-General

Purpu$4! Cummunications

Receiver-Top

'VielC-Cot'ers

R(·mm--t..J..

I

.~---.--,---~------

....

--------;-

...

-.----.~-

--:----_._-----

~-~,

I

RCAVICTOR AR-88.LF User manual

Popular Radio manuals by other brands