Military surplus Surplus_radio_conversion_manual_vol3_1948.pdf Surplus_radio_conversion_manual_vol3_1948.pdf

$I]HPTI]$

BADIO

COTI/TR$ION

III

Conversion

701-A
AN/APN.I

AN,/CRG7
AN/URg'
ATA

BC-442,

696, 950,

cBY

52208-1r,

ÍT-2414

of

4s3-4s5,

-29125,

(for

456-459,

t0ó6,

1253

50083, 501 41,

52232,

crystol

52302-09

filter)

SEE TABLE

VOLUME

ó03

OF

CONTENTS

I[ANt]AT

(COL-430ó5)

MBF
MD-7i ARC-5
R.9/APN.4
R23-R28/ARC-s
RAT, RAV

(53)

RM-s2
RT-I9/ARC-4

scR-274N

scR-522

T-t5/ARC-s

PAGE

ON

to T-23,zARC-5

4

[,

_**

For

Amqfeur,
qnd

Cifizen's

Novice,

Rqdio

Service

Technieisn

and

LIan Rioer

wanes,

but

huge, hidden

swphrs
never
by

like Ol'

Just

supplv \\'axes
of equipment are snapped up
new, larger amounts of equipment
there must be some
equipment each day which will
prices!

only

rolling

to

replaced

be

locations.

along. The

amounts

at bargain

equipment keeps

completely dries up. Untold

"surplus

arriving

be sold

hounds"

from

unknown

factory turling out tons of surplus

to hams and others

by

Surely

Nfodifying
Citizen
most surplus equipment cannot
selling
item
saving

equipment do
the original

puzzle.

"surplus
adept

and because
surplus equipment
questions

or for
which
perplexing

Radio fan is

many times the cost

at

can be

price!
However, every silver lining

Other items

hound" must choose rvisely and

improvisation and

at

Because of the time

relating to conversions of

purchasing

runs a surplus

questions

surplus equipment to fit the needs of the Amateur or

interesting

of

made

diagram, making the conversion

of the

a

piece

not have

schematic

not

are

rapid and chaotic changes

is

it

impossible

)

information. The

column. This

which

high-grade

of

worth the time to

"make-do."

required

may confront

and exciting work. The high

matched by commercial

be

the surplus item. The converted

has

diagrams. lv{anv items are

to

for the editors of

equipment,

column often

"ham"

a cloud. Some

process

convert them!

well

when

enter into

in the

reader is

the

referred to CQ

"surplus

equipment

pieces

akin to a

he buys, and

personal

surplus market

this Manual to answer

to requests

contains answers

hound,"

quality

equipment

at a

of

modified from

crossword

The enthusiast

correspondence,

for schematics,

magazine,

of

surplus

money

surplus

must be

(and

to the

Good
Special

California

luck,

for

and may

thanks

the use

youl

due the

are

of several

conversions

Arrow Sales Company,

difficult-to-locate

always

workl

schematics.

North Hollywood,

q,?

5n

Cot. No. EE-333

SURPTUS

CONYERSION

RADIO

MAN

ltlVOLUME

WILLIAM

Copyright, l9ó0

Edifors

ond Engineers,

New

Augusto, Indiqno

Editor

I.

ORR

by

ltd.

UAt

Copyright under Pon-Americon

Published

All rights teserved

Printed

ond distributed

in U.S.A,

Convention

to the

electronics

New Augusto,

trode

by

lndiono

SURPLUS

RADIO

CONVERSION

MANUAL

VOLUME

LIST OF

on which doto

to T-22IARC-5

T-15
BC-45ó ro
SCR-274N
CBY-52000 series

DY-8
DM.34D
BC-453
8C-455
BC-ó03
AN/APN-I
AN/CRC-7
AN/URC-4
MD-7lARC-5

BC-442
RM-52, 53

FT.24IA
T-23lARC-5
BC-458

459 & ó9ó

series

DY-2A/ARR-2

or

(SCR-508,

(RT-t

(SCR-274N)

wE-70r-A

BC-l 253
BC-r 066
R-9/APN-4
MBF/COL-430ó5

R-28/ARC-5
RT-1 9/ARC-4

BC-624
BC-312 series
BC-342 series
BC-348
BC-375/BC-l

AN/ART.I3

LM
AN/APT.5
cPR-4óACJ

BC-659

BC-I335A Receiver/Tronsmitte:
AN/ARR-2

AN/APA-I0
AN/APT-2

(SCR-522)

series

(ASB-5)

THn Wonr-o's

Tnr Wonr-u's

Wonr.r's

Tun

9l

Other Outstanding

)
(

I

,

528,

538)

59)

Tnn RelrorELEpHoNE

Sunpr,us

Sunpr,us

Ranro CoNvsnsroN

Reuro

RADIo Tusns

Tnr-nvrsroN

Egurver,rrvr Tunrs

is

Tronsmitters/Receivers

Dynomotors
Dynomotors
Receiver
Receiver for
Receiver for
Altimeter, os Trqnsmitter
Tronsmitfer/
Tronsmitter/Receiver
Modulotor

for

Reloy
Telephone Unit
Crystals
Tronsmitter,
Tronsmitfer. conversion
W. E. Tetrode
Tronsmitter

Receiver
Receiver

Tronsmitter,/Receiver

24-volt
Receiver,
Receiver/Tronsmit"ter

Tronsmitter,
Receivers

Receivers
Receivers
As Modulotor
Autotune Tronsmitter

Power
Rodor

Receiver schemotic diogrom

Receiver/Tronsmifter schemctic diogrom

Receiver

Ponoromic

Rodsr

Tnn Reoro

Tusns

to moke crystol

Dynomotors to

Supply

Set

Set

Books

CoNvnnsroN

(BneNs'Rerro
(
(

III

EQUIPMENT

given

Citizens' Service
Citizens'

Receiver

ontennd chonqeover

Adding Vorioble Tuning Control

---

schemotic diogrom

schemotic dicArom

schemotic diogrom

BntNs' Tnr-evrsroN
BneNs'

phone potch

os

to

50 or

Tube -...--....--

qs

rodio control

TVI-proofed

for LM Frequency

Adopter schemotic diogrom

from

Haxosoox

LrcnNsr MeNuer,

MeNuel, Vor,uun

MeNuer,, Vor,urte II

Equrv,l;,nNrs TuBE

in

Service

os

144 Mc.

-.-.---.-.
I l5

for 2 meters

schemotic díogrom

volume

this

---------.

-.----.-.------.--

Hondie-Tolkie

filter

to S.S.B.

receiver --.--.....--.-.-.-.-.---

v.o.c,

-.-,--..-.---.-.-,.-

notors -.-.-.-.-"..-..-.-

Meter

the sqme Publisher

I

TusB Vens

Mrcurr)

Tunrs Veln Mncuv

Venn Macuu

snd 4l

5

.-.--.-.--.-....--.-

tt
t3
14
17
t8
l9
22
28
29
30
30
3l
3l
37
42
43
43
46
46

49
49
52

ó0
63
63
67
69
70
76
77
78
80
82
85
86
88

)

)

Sunpr-us

The
lar pieces
Designed
cluantities
nnd
that
dio
irirplirnes
Thc
voice,
Incluclcd

rnittcrs,
iigure

The
shorvn in
of

beam power
The master
pacitors
tlututz

transmitter
frerlue.ncv
crr,strrl cloes

Raoro

"Commirnd"

the Air
make

transmitting

e<Sripment

The

of radio

in

1938,

for

over a decade

Force.

up ir

equipped

tone

rnodultrted,

in the

equipment

modulators,

l.

basic

circuit for

figure

oscillator

ganged

are

cn'stal resonrrtor (Y-50

for

use u'ith

caliltration

not
tinuotislv viuiable
plifer

tiink

c,ircuit

bv

rotarv

ir

in

tlie arnplifier

The

lotrcling

b:rsic

circuit

shown in figure

l'reterodvnes,
r,f.

and i.f.
electrically
metal

All

racks

rvhich

plugs.

in
ment

are

ries,

as the
the different
of tlie racks is

and except

tuned

and

12

volt tubes.

Command

rnake

general,

In
not

interchangeable

plug

brirnches

physically.

not

service.

The

follorving

of

the Command

tionol

conuarsion
ment is
uersion
and does not

giuen

scríes.

inVolumes

The mtrterial

duplicate

manuals.

Converting

Technicitrns
a metliod
v.li.f.

operation.
iì porver
placing

n tube.
receivor,
mended
general

usage.

suppll', reu'inding

but
as the

and v.h.f.

of convcrting

This conversion

tlie use

i,f.

CoNvrnsroN

N{eNuel,

"Commond"

Sets

are probirblv

equipment

they r.vere produced

The

complete

nnd receiving

.w'ith

is desígned

and

2.

A master

amplifier

and pou'er

for

rrt

control

couplinq

lncl the

c'oil

tiuik

circuit.

for

3. All

receivers

for L-C

cilcuits,

equipment

electrical

the racks

sizes and

of

necessitn',

information

equipmcnt

infornratíon

material given

the

Commond Receiver

to

Six

The coiversjon

of the

bandrvidth

on the

for
virrious
set form

a 21 volt

to

or

continnous \\-A\.e

rrre

various rec,eir.ers,

auxiliarv items,

iill Commirnd

oscillat<>r

tubes

connected

simplification

is srrpplit'tl rr.ith

)

"rnirqic

a

(rrìr

s7rr

transntitter

brtu'een

.urtcnnl

L-51

)

i

the

Con-rmand receir.ers

they

Eacli receiver

is

designed

interconnections

for

u'ith

pin

connections

tlie Armed

hou'ever,

conccrns

for

for

I ancl

lI

ilcluded

Meters

operators

the Command

involves

the receiverr

may

3-6 \Ic. r'cct,iver

is

Voruvn

Sets

the rnost

surplus

in prodigious

the

Annr',

items

ii multi-cliannel

pircktrge

d.c.

transmii

amplificr

eve" ttrbe

rf

op

fre.<1uenct..

c.ircuit

;rnd a rotan.

are one-band

elements

are

one

racks

Forces.

amateur

this

of this surplus

hereu'itli

are interested

be done

about

the

oî

eqr,ip*"t

for use

pos'er

irncl reccive

tabulirted

transmitte.rs

erc.ites

in p,uJlel.

ttrning

of controls

tlrt, clial.

the pos-er

is ircliieved

forrning

essentially

employs

to

series

of

differ

for

the

adaptation

use.

Ttoptúar

in

the

rcceivers

constructing

coils,

is

optimum

popu-

market.

Naw.

ra-

on

solìr.ce.

siqnals.

triuts-

in

ir

ltrrir

ca-

t'aclr

to

check

Tlre

Con-

am-

link

coil

super-

the

alike

six

mount in
via built­of equip-

other

se-

for
The use
amateur

Arldi-

cquip-

con-

is nerv,

previous

in

for

and

re-

u-ith

any

recom-

for

III

.

ing

u'here
po\\,er
filament
ly pliased

i

operate
ceiver
conversion.

Norv,
each
Lift
liolcling
thc base
coils.

is

5. Reasser"nble
Lrnit

\e.xt.

lrcliincl

.{

\\'E-717.\,
ttrbe
connt'c'tions
pin
as

sl,,,rvn

In
sjqn.rì
the
ing

is

NOîES

Remove

the

the

scre\4/s,

the

dynamotor

supplv

rvindings

produce

to

perfectly

works

on

remove

side

of

the

out

the

triple

the

coils

and

clean

Wind

the

in

the

recciver.

remove

thc

tur.rinq

rn'rrilable

is

rrn oc,tal

rrs

to

tlit'

sir r.rrlt ri

ilr

li'jrrr,

jt'ct

.r

l) \[t

lt'r't'l

rlo,,,,

oscill.rtor

capircitor

CHART

p.trkling

)

A-qLATE

-MoDUL

B

C-PLAr€

araR /NcL
C/RcU/T

,,COMMAND"

top

covers

Clean

shou,n in

of

at this

a.c. before

the

receiver

coil

in

the

the

and

off

the

rvas

mounted

ficure

the

transformer

11.6

volts,

voltage.

coils

by taking

case

can

and r.emove

cans.

terminals.

you

self-supporting

the

coils

in

the shields

the

12SK7

capacitor.)

at

anv laree

basecl

thc 1lSK7).

6.\K5,

inclinq

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of

tlre filirntent

{.

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rear

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and

4.

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must

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The

12

N{ake

sure

start

the

out

the

that

hold

the

the

Remove

the coils

Discard

coils

shorvn

and replace-the

r.f.

tube (immediately

and

replace

strrplls

ancl lias

store.

the

..hot,'filament

the

transformer.

thc

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to damage

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you

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tronsformer

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supply

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B- NOT USED IN CONVERSION

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4.

bolted to the base. Connect
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to the

ground

lug. Connect the whíte
filament lug on the
for base connections).
aith the blue tracer

above connections

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positive

the

has the negative terminal

car
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A reworked

terminal

with the uhite wíre

dynamotor is shown in figure 8.

ushite roire

dynamotor base ( see

Finally, connect the uhite

to the B-plus

are for automobiles

of

the battery

the rohite uire

haaing a red tracer

uire to

lug of

the base.

grounded.

grounded,

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haoing a

the

figure

7A

wire

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your

If

reverse the

tracer.

Converting

for Broodcost Reception

The

Q-5'er

genernlll'
tion receivers. B1,' modifving

to cover the broadcast
elal broadcast
converter
for receivers
intennediate

(

BC-453 ) covers 190-550 kc. and is

used irs a selective

band

reception. It

for

mobile

u'ork,
such iu the BC-3-18 s'hicli havt'
frequencv

channel.

Figure

,,COMMAND"

ER POWER
left is converted

dynomotor, ond ot

is the

power

figure 7 .

o

Q-S'er

i.f.

strip for communica-

the coils

(550-1500

it

may be made

kc.

also can be used

or it can

serve as a

8

RECEIV-

SUPPLIES.

At

DM-34

right

supply of

for

)

with a

ir 715

gen-

Q-5'er

kc.

-\llxuel,

The

tions

iue ruade

l-Remove
')-Rernove

3-Rernove

{-Remove

ondirn'

Do
nrarr'
the

coil lack.

(prencv

\roluur

tzats

)

SCHEMATIC,

FOR

COMMAND

coil rack

(L-2
(

erid

not remove

(the

ranse

210

500 turns

),

'220

)

195

(

L-5

grid

of

is

to the

t'inding).

The

550 kc.-1600

III

Figure

removed

coils:

tr-rrns

turns

turns

).

itnv

turns

receiver

NOISE

and

fror.n

the

from

from

the

front

from

\\'hen

u'ill

AUD/O
I

2A6

9

LIMITER

RECEIVER.

the

follorving

iuttenna

the

mixer

tnixer

the

con.rpleted.
norrj

kc.

coil

coil

coil

oscill:rtor

oscillntor

tune

-{.djust

altera-

lL_l).

Drimarv

secondarv

coil

sec_
pri_

coil

."pù""

the

fre_

liigh

fre_

91el9y

(C

the
powdered
oscillator

alignment

1E, 9-+C)

low

frequency

iron

series

capacitor.

A

Noise

Tired
rurrnd
can

be
124L5
diode

of

the
conduct;
strong
glid,

circuit

gooct

as

the

audio

Limiter

of

automobile

set?

A

very

connected

tube is

is

connected

1146

is

however,

audio

peak)

out

the

more

distortion
be incorporated
s4ren

it is

not required.

Automotic

Your

Autornatic
preventing
sigrrrrìs.
leceivels.
ir.r,'.c.

incorporirted

ponents

volume

distortion

It

is ver.r'

(\ote:

rrre

incorporrrted

rvith

on

the variable

end

of

slug-cores

padder

(C-g)

for

simplà

as

shown

used.

The

to

the

slightll,

negative,
rvhen
the

diode

ground.

to

complicated

is

a

to remove

Volume

Commond

control
or

sirnple

A fe*''ARC"

All

).

tlie

oscillator

tuning

the

band

ùitfrin"

in

the

three

on

the

your

or

but

in

static

effective

figures

eRM

cathodJ

1246

control

so

the

a noise

peak

conducts

The

limiting

shunt_type

little

l-righer.'

the liniiter

Control

is

extremely

overloading

to

add

iì.\..c.

serics

tlie

essential

in

all receivers,

shunt

padders

capacitor.

adjustable

coils, pt",

end

of

thà

Commond

on your

noise

g

and

of

one_half

grid.

The

àiode

does"not

arrives (or

and

shortì
action
limiter,

A

s*itch'may

from

the

for

Set

effective

on

strong

to

the

CoÀmand

receivers

a.v.c.

but

there

t5

Track

tfr"

tunine

Set

Com_

limiter

10.
of

the

grìà

the

is

as

but

circuít

in

local
have

com_

is

A

a

Figure

The ì2AL5

limiter
ploced
chossis
the

tube moy

in

oreo

pcnel

ce ive r.

I

0

noise

be

the

under-

behind

of the re-

t6

Sunpr-us

Ranro CoNvpnsroN

vî-i31
12SK7

@

INAL

ORIG

SCHEMATIC,

,,COMMAND"

no connection

conversion
amplifier
r."qìir",

iisures

to

l2SÒ7
,."roì,
470K

Connect

junction

the

i'irc'uit

the

A srnirll
aclapter
The

in ìelephone

trse

and
ket,

face.

the

A
rdapter
enoi sh
for the

If th; b.f,o.
the

on

switch
three

A single

ped around

is

stages

tu,o.iidditional

11A

(\'T-133).

4 and

pìns

ràsistor

seconcl

the

of
increirse

to

Built-in

A

speaker

platé

"tueaker"

11116;

and

tliick.

identifiable

blank

plate.

clear

tà

gain

control,

plate is not

new

is desired

components

layer of

the

SCHEMATIC,

FOR USE

vf-133
12SQ7

Figure

A.V.C CIRCUIT

ir.r'.c.

reìistors

l1B.

Connect

the

of

5

pin 5 to

470K

and

the

them.

First,

effect

betu'een

provicle

to

bv completing

and

from

C-l5A

SPeoker

Commond

be

may
in the
is the

trluminutn

front

smirll

l'randsets'

It is

bv

A hole

HA-l

the

shos'n

rvill be

it

together

"Scotch"

shell

is

of

su'itch

Figure

IN

RECEIVER.

:ivailable

the

is cut

the

VT-l3l

125X7

éî,i'LîJ'8f,

MODI

ll
RECEIVER.

purpose

The

the

to

action

a.v'c'

the

ca,pacitor'

a

and

unground

ppfd.

100

tlie

tube

adjacent

an

resistor

R-11.

of

socket'

the

for

Connect

betu'een
Remove

a.v'c.

Your

Receiver

the

mounted

of the

receiver

It

letters

plate

unit.

in

used,

not
critical.

tight squeeze

a

on

speaker

HA-I SPEAKER

"COMMAND"

in
Command
element

is only

Lk"

on the

HA-l

replaces

the

plate

in

A second

figure 6,

placement of

However,

new

the

electrical

isolate

to

HA-I SPEAKER

l2

adapter

tape

olfi

o",

@

FI ED

FOR

of

r'f' and

circuit'

Refer

of

pin

5

capacitor'

ground

pin 5

R-11 from

action'

removable

receiver'

in standard

diameter,

in

surplus

stamped

original

the

large

-just
is made

hole

parts

b'f'o'

if a

get

to

plate'

is w-rap-

it from

UNIf

n,,

this

i'f'

It

tìe

the

lug'

and

mar-

on

the

I--l:r"-:

BLOCK
SION
FROM
455

chassis,

the
in the

body

the

of the

out

\\/ire the

of

#4

plate). \Iount
ihe control

control

of the

side
to the
clean-sounding
leceiver.
figure

Receiver

It is

form

to
single
Th; BC-453
receivers

is

tion
amateur
as described

signal

kA, within

bination
freedom

Only
plifier,
i.u..".,

(

12SK7
section
oscillator.

DIAGRAM

AMATEUR

TWO

serves

trnd

plate a second

of the

hole.

positive side

(the front

J-I

to

pin

to

ipeaker

of

front

ThJcomplete

12.

"Double

A

possible

double

à

sideband

(190-550

are

shown

band

this

of

the
provides
from

portion

a

mixèr,

irnd

\r-5

)

of the

The

|

\a-9

u€ w-

M/XER

S TAGE

V.rs'c"*\

05C. SrAG€

NEW

Figure

OF

BAND

"COMMAND"

portion, ond

r.f.

os

os

after

"i.f.

placing

piece

speaker

to

of

plug in the

gain

the

pin

#1

the

speaker,

control'

of

#Z

1-t,

of

J-1.

ground. Scres'the

to
receiver,

audible

wiring

Conversion"

for Single

to combine

conversion

reception

kc.) and

A block

used'

figure

in

(oiit may be
later
receiver

tuning

bothersome
and

are

is changed

l2SR7

13. The

and

)

(

2830

range

exòeleni

of the

i.f. stirge

first

unn-rodified.

(V-7

ar-rdio

12A6

BC-455

MC.)

-

TUNE

ì

kC.

rA

2534

3

300
SiGNAL

z-3

DOUBLE _ CONVER-

RECEIVER

MADE

RECEIVERS.

BC-453

serves

strio."

the

of terpe

hold the

speaker

the

back

\\'ire the

the

and

Fintrlly,

you have

and

manv

changes

speaker

is

unit

in

r'vrapped

from

directly

the adapter

of

"hot"

other

counect

adapter

feet from

are

side

the

a sensitive,

shown

Commond

Sidebond

two

receiver,

selective

or

BC-455

diagram

BC-455

modified

intermediate

the

kc.

)

of the

sensitivitr',

"image"

The

tr mixer,

into

is converted

)

is removed'

tube

Reception

Command

suited

rvell

reception'

c,w.

(6-9.r

the

of

tunes

other

for

is c_onverted

BC453.

selectivity,

signals.

is used.

function

The
in

second

and

to

combina-

the

frequency

The

l-F

Kc.

+

BC-

hole

the

around

slipping

pin

to

arm of

of the

other

plate

the

in

receivers

for

Mc.)

Mc'

7

bands

300

to

com-

and

r"f' am-

the usual

i.f. stage

b'f'o'

the

mixing

a

\fexu,c.r,

The,

l2SR7
below
frequency
this
trveen
l2SR7
norv_be

tor

C-28

(luency

quency
formed

The

(Iuency
BC-453

fier,

Vor,uun

first

step

beat

oscillator

the intermediate

of oscillation

change,

the plate

socket.

Remove

solder

(pin

The desired

tuned

by adjusting

on

the side

by listening

meter.

into

next

of

which

The

a

suitable

step

300 kc.

serves

is

the
BC-455 (trirnsformer
sistor

between
Solder
pin

cut
leach

a I00

rvhich

#4,
a short length

from pin

BC-453.

transformer

ground

by
the inner
BC-453,
second

receiver.

Tune

to 7

Mc.

tuning
the
band

either receiver.

edge

on
frequency
tune

the

drop

in received

BC-453

nal

-

As

at

for

1n

7150
the BC-455
BC-453,
way,
or
tuning

and you

you

two kilocycles.

dial

pin

ppfd.

is

used

#4 to

Solder

the

socket

(pin

lug

conductor

ground

and

the BC-453

You can

of

the amateur

the

BC-453.

receiver

BC-453 for

signal

s.s.b.

or

example,

kc.

Set

the

to

7100 kc.

are

can read

Alrvays

to 300 kc.

455.

Converting

20,

15,

Conversion for

It is possible

plus

market for

it is

onlv necessary

to

use

them as

To rework

rrsed.

You will need
quency
of
the
in

meter

the BC-455

coils and rewind

figure

14,

to

the

plug-in

a rirck,

in

order to listen

during

You

can

III

is

to lower

until it

frequency

is

therefore

a 100

#5) and

ppfd.

ground

frequency

the

of

the receiver.

to it

on

a nearby

old

b.f.o.

mixins

to

(2830

as

third

Z-3).

couple

kc.

the lorv

i.f,

Solder

oscillator.

the new

minus

#1 and pin

cirp:rcitor

as

a tie-point

of shielded

the

antenna

center

conductor

Z-3

and solder

#5 of 12SR7

to

the

antenna

the

shield

to

300 kc.,

now

tune in

general,

In

band,

i.f.

is

The

broad

bandwidth

enough

100 kilocycles

strength.

c.w. reception.

suppose

your

BC-453

Next,

"on

the nose"

frequency

you

to

remember

general

for

the

BC-455

ond l0

Citizens Rodio

buy extra r,f.

Command

to

coils in your

the data

to

borrow

the

them

check

sets.

rewind

anothei

tracking process.

to the

the approximate

the

frequency

operates

300 kilocycles

of 2830

2b30

mica

(pin

of 2830

b.f.o.

trimming

Check

receiver

has

now

i.f.

2530

frequency

transformei

a 30K. l-watt

of

#2

the i.f.

betu'een

terminal.

rvire,

long

terÀinal

to pin

the

shield

socket),

terminal

to the

and

chassis

tune

4O-meter

tune

the

and then

to allow yo.,

or so

Use

the b.f.o.

want

to tune

300 kc.

tune

up

at

71b0 kc.

and
50

of reception

to

set

tuning

rvith

for

Meters

Service

coil racks

To change

these

racks,

BC-415.

figure

of

receiver

to

the mixer

specifications

of

kc.

The

kc,

To

effect

capacitor

#f ) of the

kc.

capaci-

the fre-

or fre-

been

trans-

output

kc.

into

)

i.f.

ampli-

from

socket.

pin

#1

Finally,

enough

oT th"

of i.î.

#4

to a near-

Connect

of the
of the

the

BC-45S

signals

BC-455

cover

of

the hish

without

in

in

a sig-

then

kc.

on the
In

to one

the

BC-459

the

on

the

bands,

and

then

14

mav

oi

oscillator

Remove

given

resonant

the

new

be-

may

fre-

the

ihe

re-

.rnd

by

the

.-to

the

tune

this

BC-

sur-

be

ft"-

io

to

a

frequencies
out

the-shields)

grid-dip

a
from

the

mixer
modified
in

the

on
!h9

Adjust
tion
until
Finally,

for
step

the

rack,

the

Command

hig[

frequency

the

of

the

the

oscillator

trimmers

maximum

is

to

cover
lecalibrate
directly

on
aue required
rvith

the

BC-453

plies

to

the

"Hop-Up"

jmprov.ed

rt

possible

ts

and

to materiallv

20

meter

riìnges.

tubes

irre replaced

r.f.

iimplifier
necessary
r.f.
In^-addition,

0.01
of

the i.f.

rvith

BAND

14

MC.

2l MC

27 MC
28

MC

NOTE.:

COIL DATA

tube.

pfd.

a l0K,

!.

REMoVE
oF t2SX7
PLACE
u/xER

l!.4c!

THE

to

Shunt

disc

amplifier,

ANTENNA

OF TURNS

51n

WIND

IOO!!F
co/L

6ry, t-warr

SAME

placing

by

and noting

oscillator.

and

coils,

and

replace

set,

trimming

tuning

capacitor

C-2,

strength

the

tuning

the

bigh

the

dial

for

each

dial.

27

N{c.

Your

High

to

boost

improve

To

u'ith

trrbe

is

los'cr

the

R-l rvith

bypass

ceramic

l0 watt

COIL

(Lr)

LENGTH

3/At

1/O'

ALL

COlLS

w/NolNc

Lz FRoM

R-F

S.ACE).

CAPACITOR

socKET

Z_5A.

REstsroR

SOCKET

(sEE

FtGUne

FOR

14,

the

coils in

the resonant

Be

sure

to remove

oscillator

solder

the rack

and
oscillator
capacitors

coils.

all

connections,

in

then

look

in

on

(C-48,

tuning

covers

C-4D,

and

of received

dial

with

frequency

face.

band,

The

Citizens

Only

as

the

28

Radio

bands

one

main

N4c.

Commond

Frequency

gain

the

recèption

do

this,

l2SG7

re;tlirced

cathode

a

socket

cnpacitor.

shunt:the

resistor.

MIXER

N'

OF ÎURNS

3

5

WlTH

NO

ALL

AETY€EN

oErwEEN

3a )

Figure

CONVERTING

21,

OR 28

of

the

l2SK7

tubes,

u.ith

bias resistor

620

ohm,

pin

#5 to

screen

COIL

(

L5

)

LENGfH

3/E'

l/6,

IA

€NAM. V/RE.

HIxER

coILs.

PIN*T

prN{1

ì 4

Mc.

the receiver

frequency

the iron

When

place

the

receiver.

for

the

a nearbv

the

or"illoto,

C-4G,

the

C-4F

and

desired

are

signals.

rrhit"

enamel

with

India

or two

tunins

coil

data,"also

Service.

Receiver

Reception

the

Command

on

the 10,

i.f.

and

tlre i:SfZ

a 12SG7.

R_l
X-rvatt
ground

To

Èoost

resistor

OSCILLATOR

(

Li3

NO OF IURNS

7 t/z

6

1/2

z

(PLATE

AND PIN

ulNoINc

#1

plN

aND

* z oF

BC-455

OF

(with-

on

core

have

vou

them

Turn
sisnal
receiver.

,""_

C_g)

tange.
adiust*ecl
Tlte

last

and

ink

markings

is doie

ap_

for

set

15,

and

amnlifier

It is

rilso

on

the

resistor.

with

gitin

tl,re

(R_22)

COIL

)

LENGTH

1 /44

TO

T7

of

a

18

Sunpr.us

Ralro

CoNvBnsroN

If
may
with the

1000 ohms across
ceiver shows
ure 3

gain

the

result. It can

for receiver schematic

of the

value of these two shunting

signs

Conversion

t-15 MeterAM/FM

l0-t

(ldeol

The BC-603

Radio Sets
reception
tivity of one

SCR-508, 528, and 538.

the

over

microvolt, and 80

is

receiver

be eliminated by experimenting

R-l

of

15K across

and

feedback or oscillation.

and

of the

BC-603 to

high, instability

too

resistors. Try

R-22

iÎ the

parts placement.

q

Receiver

the

for

Citizen's

f.m. receiver is a component

range of 20-27 Mc.,

Bqnd!)

It

kc.

bandwidth.

provides

has

re-

See fig-

part

of

f.m.

a sensi-

An

in-

termediate
a self-contained audio amplifier
power
volts
verted, this
high frequency a.m./f.m.
schematic

Adding

The
both the
dynamotor
value, but the
the a.c.

frequency

for a speaker,

battery

the

is shown in figure

drain is 4

inexpensive

An A.C.

purchaser

l2-volt dynamotor

(DlI-36).

base makes an excellent

power

supply.

of the

2.65 Mc. is employed, and

of

or

watts for headsets. On 12

0.2
amperes. Properly

surplus

receiver.

16.

Operoted

BC-603 should try to obtain

(DM-34)

2S-volt

The

Remove all components

provides

item

The original

2

makes

watts

a
BC-603

Power Supply

the 24-volt

and

is

unit

of

foundation for

of

con-

good

little

from

BC-ó03
CEIVER.

F.M. RECEIVER

A.c.

power

supply is

Figure

MAKES

shown

l5

HANDY

mounted

I-ìs METER

l0-l

in dynomotor

A.M./F.M. RE-

well of

receiver.

\'IeNuer,

this

brrse

''Jones"
and open

18,
Finalll',
length

c:d.
the

15.

nector
\Vire
ings
provide

the
the

c,orrne<,tclr.

tlie ey'elets,

as sl.rorvrr

jumper

of

hook-up

\Iount
chtrssis
\ftlrnt

and place

as

shotvn in

o{

th_e power

abont

te_ceiver,
BC-603.

Converting

The BC-603
Horvever,
clioke in
It rvas

ment
clioke
finite
audio
signal
is

to su-itch
the f.nr.
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Remove
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Also remove
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resistors

the
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nirl

of
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Connect
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of

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some

the cathode

probablf

of

the r.f.

(L-1

impedance

signal

is

tuned

detector

"intercom"

the four

guard.

thc

chassis,

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back

ancl remove

)

R-32,

correctors

from

R-22,

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J-1.

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u'ire

ground

and

chassis,

connected

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C-l1.

to

this terrninarl

one of

arm

Connec.t

\'-6

Vor-uun

and discard

in figure

the
opposite
the

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and

the

permits

)

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the

screu's

The front

the

the u'ire

and

certirin

tlie
R-32,
irnd connect

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to the

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of C-11
Connect

to the

the r.emirining

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III

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pins

#1 and 2,

rvire

nerv power

the

6X.1

tube

the

filter

figure

h-ansfonner

volts.

vou are readv

BC-ó03

rvas

designed

farsighted

circuit

incorporated

and

i.f.

the limiter

detector

trcross

in

orr

the receiver.

audio

iind

this

front panel

at each

being

"intercom"

running

R-33.

receivers.

\ou',

).

rrudio
and

the

tlrree resistors.

srvitch

tlirec

the

locate

to pin

terminal

the

irlone,

the

of

the

otlier

terminal

limiter),

them

all,

all ltrgs

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17.

to

17.

circuit

the rvire

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R-33.

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C-ll,

audio

C-11,

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and

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#1.

transformer

connector

socket

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circuits.

choke.

panel

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of

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choke

above

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sure

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the pos.er

foi

to

A.M.

for

f.m.

designer

of tle

6ACT

to facilitate

also to

for

a.m.

this

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of the

Tliis

as

an

of the

corner

controls

srvitch

betrveen

from

of
They

the

transformei

Unsolder

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and

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braids

tlie

audio

C-11

is

amplifier

Unsolàer

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just

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This lead

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the

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pins

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a

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is

at

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the

connector.

properly

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Reception

reception

includeà

In

signals,

BC-603

conversion

a.m,,/f.m.

receiver

of

(stampedD-2

D-2
these

are

blue-green

replace

pieces

to

audio

connected

the

from

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the

an audío

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any

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act

as

and

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an

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will

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to

the resisiors

resistors

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this

wire

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it

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the

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the

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Rodio

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erage
This

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The
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Service

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and

the

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the

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proper

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of

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high

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the

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is

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ferv

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\Ic.

amtrteur

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the

The

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be

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the

transmitter

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L-105.

L-105

to

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to the

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and

circuit

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on

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11

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the

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right

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tlie

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Citizens

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42O

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often

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from

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rvire

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Citizens

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Radio
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chassis.

lamp

ond ó.3

rvill

tune

(brown

dum-

SCHEMATIC,

the

for
420

my antenna

for

tenna

Converting

AN/CRC-7

The
receiver
operation

of components
strry, The
trn
is

and
regenerative

150

used for

in the

"exploded"

given

complete

in figure

The CRC-7

3Q4.

one

\Ic. The

cletector lra'"'ing a

ro a-F

osc.

I

*l*

|

t--;rr4J

tf",""#8î.fFj

ALL RESISTOR VALUES ARE
€/VEN /N OHMS AND CAPACITOR

VALUES /il

!'F,

Figure l9

APN-I

tuning adjustments.
N,Ic.

band

AN/CRC-7

the

is a batterv operated transmitter-

Air-Sea rescue u'ork. It is

144 NIc. amateur band, and purchase

other than a

unit is shou'n in figure 22,

is

vierv

One half of a 3A5 is

sccorrcl

shou'n

24.

uses 1.4 volt d.c. tubes-three

half <;f

OSCILLATOR

is

shorvn

in figure 21.

to

set

of batteries

in figule

uscd as a

trrning

this ttrbc is

A suitable an-

144 Mc.

capable

is

unneces-

23. The

litnge

circuit

of

used :rs iur

of

and

3A5's

super-

135-

TANCOn

c-84ot

I

Èl

tfl

I

'r].

zsu,

\ loto

25V. I I

J lo2
ÎRANSMITTER
ANTENNA

OTHERWlSE NOT€D

UNLESS

CAPACITANCE

RES/STANCE

@

IN !!F,

/N OHMS.

Figure

20

SCHEMATIC

POWER

SUPPLY-

MODULATOR

CIRCUIT

AND

REVISED APN-I

OSCILLATOR

Power tronsformer

235-0-235

livers
ot 40 mo.,
qmperes,

ot 2

omperes.

ond

5 volts

volts

ot 2

ó.3 volts

de-

MeNuel,

audio

amplifier for reception

is

3Q4
ception

17,573
quency
irs a dual
Mc.,

Transmitter

employed

and

One

Mc.,

and

3A5

doubler

doubler,

the second

Volulrn III

as

an audio power

as a modulator

section is

with

the

second

to 35.146

the first

section

output is

on this frequenóy.

for

used as

section

Mc.

section

doublins

and transmission.

amplifier

for

transmission.

a crystal

A

second

oscillator

acting

3A5 is

doubling

as

to

70.292

to 140.58

The

re-

on

a fre-

used

Mc.

MAKE
uo t2

€LEMENTS OF

F. wtRE.

SHORI
OF RG_59/U

23

LENGTH

The

Figure

AN

22

CRC-7 is o

bottery-operoted
ceiver
ed for 2-meter

eosily

teur

operotion.

convert-

omo-

re-

FOUR-ELEMENT

Opening A
the

Cose

tttre.
step

is
along
plate.
belou'this
terior

the

battery pins.
cidentally,
avoid

Next, remove

the

tu'o halves

opening
pletr,ìr'

Sincc

to c,rrt off

the sidc

This n'ill

brass

of the

the

sawing

Figure

FOR

420

good,

sharp hack-sarv

the

CRC-7 case.

heremctic,allv

the ltirtteries

thc ltattt'n'

of tlic

trr.rit

bc

plate.

battery,

antenna

it off

the tr.vo

of the unit

\lcasule

8;í".

Do not

compartment

Remov-e

should

during

2l

BEAM

ANTENNA

MC.

sealed

are not

to thc cnd

and

the cr,rtting

screws

together.

at-ailrrbìe,

cor.rrpirrtntent.

volrr

cui

too far into

or

discard

be fLrlly

that apTtear

Nfark

is

an

asset

The

unit is com-

against

the filst

\leasure

of

tlie brass butt

unit to

you

the

rvill

shell.

cut
sarv off

extended to

operation.

to

line

a

mois-

just

in-

the

In-

hold

)í-inch

in

,,EXPLODED"

The

bottery box is cut

is

cut open os

obove

push

too

Figure

VIEW

shown.

buttons,

deeply into

23

OF AN

off, ond the top

top

Cut

section

being coreful

the cose.

CRC-7

section

Yz-inch

not to

cut

J,l

at

Sunpr.us

Raoro

Cowvnnsrow

EPRESSING
(€Y

IAE

Ttr€ fRAN

Àrso oEmEssEs

REC XEY.

SCHEMATIC, AN,iCRC-7

rbor,c thc
irrotrnd tl're
ful not
near
audio

littlc

it
nror.'e
the
clurirrg
as shou,r.r
vou shotrld
t'irrplrone unit.

144 Mc.
of the Tronsmitter

plated
circuits irs tl'rey erre
Since it is necessarv
n-ritter for 144 \"Ic. operation,
tum rrll slugs clockrvise.
are usnallv searled

push

buttons,

cannister.

to cut into

the

the screw mounts.

trirnsformer

you

Nou',

jiggling,

can

slide off

but use

and r.f.

the insulating

set. To mrrke

sure that no

the strrving

in figure

immediatelv

Operotion

raise

ancl

the re'son:rnt

rvith

and scribe
Sa*' along
interior

Just

choke, so take

the cannister. It

only moderate pressure.

tape

process,

24.

reveal

to

connect

Press the

hetrr

Tl're

transmitter

justed
All

of the

screu'ed

ririse

to

the

This is

"glyptal"

line

this

all the way

this line, being

of the case, particularly

beneath

this area are the

care!

may take

the components of

damage has

à set

"receive"

hissing

a

been done

of batteries

button and

noise in

should be ad-

for

I44

Mc.

operation.

coil

slues are

frequency

clockwise

frequency

it

will

be

fortunate,

cement,

into

silver-

óf

the tuned

the coil.

of

the trans-

necessary

as the

siugs

and turning

Figure

V.H.F

care-

Re-

the

to

^LLC&rú85
Uf,ÉIS ONilIS

{L ElllMÉt rx
uuss otHÉtur{ bfs

YHF

/lN/CRC-7,

rr r|urcC&t

rcIEO

oHs

Sa

Sclrcrodc

Rctcw

24

TRANSMITTER-RECEIVER

the slugs

in

the

rvhich
one having

from

and
possible
tl're
and

#3 of the
case is
grounded
spring is

ccnnectiou
the 18 \lc,

crysttrl
of flat gliiss
tooth
glass
circultrr

counter-clockrvisc

cement.

The first

is

step is

held

underneath

the

most

the under-side

the crvstal.

to mount

grounding,l,,,;1,,.1

case,

connecting

slipped

a sntirll pit,ct

3A5

oscillator

on,

pin

of the

soldcrecÌ

to tìrc

ranqc

A less

e-xpensivc'

usecl in

the

ancì

porvder

and

on it.

press

"su'ipes"

it

to relnor.e-

turns

of

thc chirssis

Hanclle.

ir r.rr

strrl lr,rlder

trrbc.

tlie sltring

c.n'stirl

to

tlit-

c.irsc for

rrrc

uscd

c'onr.'ersion

oriqinirl

prrt

a fen'

Place

lightlv

ircross

u'ill

the 17

).

the

of

brass

chassis

tlic return

for

ecpipment.

drops

the crvstal

but

the

Ttwmlacr-Racloct

l7lrlng

trstrallr,

tlie

transmitter

\lc.

Unscreu'

and remove

crvstirl

on the

thc holder

of

spring

socket.

tvill contact

socket.

deck

lead,

2-meter

is

to

make use

of rvater

evenìi',

glass

taking

plate.

Dtagrom

"freeze"

them

crystal,

coil form

lthe

the coil bolts

the coil

u'ith

care. It is

outside of

to

the case,

brass to

pin

Then, when the

the un­A second
to miike

brass

ground

Crvstals in

'

u.,ork.

of the

Take a

piece

and a little

blank

on

the

ten

or 15

Clean

the

Manuer,.

Voluun

III

25

cr1'stal
breathe
the
this
oscillator

crl,stirl

the
the cover
transmitter

ir considerable arrrount

moved. Peak

signnì

rvhip of the

transmitter

u'ith carbon tetrachloride

furnes!

the

frerluencr'. It

procedure several times

coil eiich time ) until

falls rrt the

Next, c'ut

cannistcr to

strength

holes irt appropritrte spots

is rc.plirc'e'd.

in

unit fully extended. This

modif

replace

),

n'ill probablv be necessrtrv to

desired

gain

iìccess

miìnner, since the cirnnister causes

this

the slugs of the

in a nearbv receiver, u'ith the antenna

ications.

(Cautionl

it in

spot

to the tuning sh,rgs

It is necessrrrv to tune the

of dctuning

liolder nnd check

the

(retuning

the htrrmonic of

in the 14.1

u'hen it is re-

four coils for mtrximltm

Do not

repeirt

the crl,stal

the

\{c.

band.

in the top of

*'hen

completes the

Figure

The AN/URC-4

bottery-powered

tronsm itter- receiver
suitoble for
sion to
omoteur
fectures
tenno

microphone.

144 Mc.

the Receiver CRC-7 onlv reqnires

of

Screu,ing the
turns
iibove
turn from

desired,

extension shaft soldered to
the case, vou ciìn
means of

the receiver

of
microvolts can

The CRC-7
lel-connected
two

u'ill hit

1-17 \lc.

the

45

volt

Operotion

into

slug

band. Some

tlie

it s'ill be

irnd

dertector coil to tune

the

receiver slug ctrn be

tunc the

plnced

knob

ir

is

such

easily be

requires

for the

B-batteries series-connected

filament sr,rpply

rcceiver

The
ing for 2 meter operation.

detector coil about tlrree

the

necessrìrv

it. Bv slotting tl"re

on tlie

tliat rr signal

hetrrd

flrrshlight batteries

tu'o

25

conver-

the

144 Mc.

bond.

built-in

ond

speoker-

section of the

receivers u'ill not

up

rcmovcd

recciver rnanually

shaft. The

and copied.

(I.4

is

o

Unit

on-

remove

tcl

148 \{c. If

to

rrnd tr

sensitivity

less

of

voìts), and

for

the

retun-

tune

onc

}i-inch

side

than

paral-

B-nlus

of

by

3

26

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(o('

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28

Sunpr,us

Ranro

Cot'tvrnsroN

supply. The RCA battery
with this unit.

Using a converted CRC-7 with the self-contained
antenna, contacts up to
made.

Converting

2

Meter

The AN/URC-4 is a battery
leceiver intended
predt'cessor,
emplovs
smaller construction.
operate on two frequencies:
To convert the URC-4 to 144
u.'ind a ferv coils.

more

for Air-Sea rescue

the CRC-7.

"exotic"

purchase

pack

VS-064

30 miles distance have been

the AN/URC-4 to o

Hondie-Tolkie

Lrnlike

In addition, it is designed to

the

circuits, components

121,5 N{c.

\lc.

a new

will work rvell

porvered

CRC-7,

it is necessary to re-

crvstal. and

transmitter-

service

the

and 243

like its

URC-4

and

Mc.

connect

a set

of batteries. The unconverted

î. ^-

ilgures

sub-miniature
tube. A dual frequencv
the
out the

rrntenna

version,

ules 26A
one for v.h,f.
tive
triode.
Bandsu,itch
Tire
incorporates
frerluency
control is
sponse is realized.
only to 144 \Ic.
rvork.

at 10.12 NIc.,
a 6050 oscillator (V-l)
tube drives
betun-porver
to 121.5 \lc.
coupled
5851 acts
and
last

fier driving
ing
feedback
for modulated

S-24.
The Two
Conversion thnt the t-RC-

ceive it.
but a
volts,

zD ano I/.

The URC-4

case. Telescoping

v.h.f.

to u.h.f.

the u.h.f.

A complete

clctector

(Note:

dctector

Tlre

transmittcr

out

is

activated

tube rrar. be removed

The

audio section consists

trirnsmission, the

good

and

employs

'rvith

the exception

the

antenna loadinq

use nt 243 \lc.

circuitn'and

circuit

and 2611.

and

ernplovs ir tvDe

lights

S-1

audicl output circuit

"bridge-T"

a

of super-regeneration.

not required

thus

gror-rnd

a second

pentode

For

of the

as a cloubler

a 3Q4

circuit is incorporated

tone transmission,

Meter

The

original

substitute is

90 volts).

of the L'lìC-4 is

T*.o seprtratc

for

one

Some

earlv models

the filanrent

The v.h.f. detector (\'-5)

and must be

section employs

for

6050 doubling

(type

v.h.f. operation,

plate

b1' tlie u.h.f./v.h.f.

po\\'er

3Q4 serves

It

is :r

der

Birttcrv cables

eight tubes,

tìntenna folds

antcnna :mtomatically

coils

lior

tubcs

u.h.f.

Each super-regenera-

60j0 miniirture

filter

tuncd

and

modified for 2-meter

third-overtone

operating

5851

)

circuit

brrtte.rv

of this

243

to

on

\Ic. for

kept

and

of n 2E3l

nmplifier

in

good

ick'a

111.;
pack

the RC-{ \-5-064

URC-4

of the audio output

cletectors

of tlie
is novel in

A

improved

a CR-24/rJ cr1'stal

at 30.375 tvlc.

is

lrcccption).

as rr ntodulator.

opr.rated

1 is in rvorking

\lc'. u.hen you

is

shown

which

all of

completely into

iind converts the

a ttvo meter con-

are not used.

shor.'"'n in fig-

trse

5676 tubes).

tube

the

to

vrrriable quench

operation lrith

to 60.75 N{c.

used

as a

signals

stage. A second

u.h.f.
sn'itch, S-1.
as

iì spare.

speech

tht'

audio system

by switch

to cstablish first

is unobtainable,

pack (

r-rsuallv

are'

are

shorts

are used,

high-p

in

use.

that it

quench

audio re-

tunes

This

doubler

link-

are

service

This

ampli

Dur-

or­re-

1.4

avail-

in

A

A

AN/URC-4, WITH
At top
Oscillotor coil
to
ond is tuned

of cobinet ore\tubes V-1

L-l is

30.375 Mc.

Doubler

to

behind V-3 ond

L-4

is behind copocitor
tuned to 243
next to

L-4.

Mc

Receiver coils

bottom of cose.

L-l

Coil
Mc.,

is retuned to

L-3 to 144 Mc. Tubes

coil

(under

the chossis)

Figure

27

COVER REMOVED

behind V-l

coil

ó0 75

Mc Doubler

is

tuned to 121.5

C-19

Tuning

L-5

Mc.,

3ó

ore

V-2, ond

,

L-2

is

ond

is

behind V-2

coil

Mc.

(20

pfd.)

copocitor

ond L-ó ore

coil L-2 to 72

ond

V-4

removed.

V-3.

tuned
L-3

Coil

ond is

C-21

V-ó

is

is

ot

\fesuer-,

Vor.uur III

29

able rrt the
dicated
rcceive

the combination

transinit button
meter.
rnore

121.5

the
munication.

The
tuned circuits.
loosening
u.h.f. detector (type
chassis. Save
power
spare.

now rescnirtz

Next, remove

microphone-earphone

the
rnodulation.
that connects
tor

).

the e-vclet
After unn'inding, feed
let and
the excess rvire.

The next
irttacìres
the same
rvind
Coil L-4

A trrursmitter
be

used for 2 rneter
CR-14/U crvstal is
cally
substitute.
national
Citv, Oklahorna.
cured bv liftinq
the nen' crvstal into position.
to thc oriqinirl
the crvstal
the CRC-7 nriqlrt frircture
the transrriittt'r' rrroclification.

Receiver Modificotion

2 Meters

for
su'itch

to

thi: coil, ln<ì uuu'ind

l-1,/6
srvitch,
u'ire,
Next, iclcntifr.

pin

rrnd
vvire

at the sockct,
from
Tliis completes

surplus store.

in figure

button

Do not leave

than a ferv

\Ic. frequencv is

first step in

the chassis

amplifier
Coil L-3 of the

Unsolder this

of the coil form

solder to

pin

to

manner as

tu'o turns,

m:r1'be removed,

sealed trpe F\l-1

This cn'stal

Cn'stal \lfg.

is not

S-1. t.Ìnsolclt'r'

trrrns on

slip n piece

and resoldcr

of detc.ctor

#1

L-5,

rrnd rcconnect

26

and a loud hiss

microphone-earphone.

and check for r.f. with

seconds when

the conversion is

Rernove

the

tube for

tube

to I44

Now, locate

step

\Ic. u'ithor-rt

the neoprene

pin

to

#1 of socket

end of the u'inding,

pin

is

to locate

# I of socket V-2 (6050,

before, disconnect

and resolder.

cn'stal

expensive,

Co., 18

TIie neu'

the

old

c'rvstal holdcr

free

tìris u.irer

link.

the

of
to tlie oriqinirl su'itch
s'ire

tìie

and

receiver

the

Connect the
receptacle

to

the transmitter

still

tl.re chassis from

mounting

6050, V-6) located

sDare.

it

(ty'pc

5851,

second dor,rbler

grill.

the end of coil rvinding

and unrvind

the "r'ire

of socket

#1

as

betrveen

service. A replacement

crystal is recommended

may be

North Lee

F\f-l

pressure

move

to

the

Identifl'
bet*'een detector
irnd the

one turn from

Route

"spirghetti"

running ltetu'een

socket \'-5. Disconnect

as before,

the

modification.

battery as in-

Press

J-1.

should be heard from

Press

a field

operating

making

used foi military

screws. Remove

re-u'inding.

waterproof

This u'ill improve

back

coil rvinding

Coil L-3 is left

it is

36 and 37 N,lc. must

and a lorv-cost hermeti-

obtained from Inter-

Solder

terminals. \Iake

crvstal. This

at tl're su'itch,

thc u'irc bi,Lck

rvire

this check as

to modify the

the case

under the

Remove

V-4 ) and

(V-3

stage

cover

(6050,

V-l

pull it

three

tlirough the

V-1, trimming

doubler

the rvire,

no longer

St., Oklahoma

crystal may

spring and

the trvo rvires

abor.rt, or dropping

completes

the r.vire running

transmit

the coil, leaving

tubing over

r.rnu-ind

end to socket V-5.

the

the

strength

for

com-

the

tlie u.h.f.

save for a

rvill

)

over

the

L-l

orclll"-

through

turns.

eve-

off

L-2

that

).

un-

"as

is."

used.

type

as a

be se-

sliding

sure

coil L-5

-

receive

pull

back

to the

the

terminal.

coil L-5

this

one turn

Antennq
for

best results
Unfold
Note
tenna
other passes
near

(for

vertical

by

ir

one-inch
the center
ing

marked
marked'A".

Nor,v, insert

loop

and
nant
to

145 N,Ic.
or conìpressing
tenna

Testing the Insert
Unit the

teceiver.
qucnc\/,

In

oscillirtor
L-3
antennir

To
ton and
metcr
completely
on

the URC-4

be

drilled
final
position.
of

trrrnsrnitting
30 miles
sensitivitv
shotrlcl bc

Modificotion For 121.5

2

Meters

on 144

the

antenna

that

one of the

structure is grounded

through an insulrrtor

the appropriate

antenna

rods

coils

"G".

of rvire.

clear

frequency

on frerprenc,v.

slou'Ì1'

for maximrrm

fullv

tune-up

signals

slug adjustments

and

)

near

the

loop

of tvire

of the antenna

and remove

Remove

Replace

the coil of

Nlake

of nearby

of the

If not,

the turns

ton

If

no signal

rinscrew

stirrts operation.

extcnded.

the receiver, press

adjust

Under

or

thc

are

inside

rvill dctune

at

appropriatc

proper

and

more. Thc porver

of tlre receiver

able

to

u'ork

Converting the

for Amoteur

The \{D-7 rnodultrtor
the surplus
75-u'trtt rnoclulator
mnning
tn'o

1625 modtrlators (12
regulrttor,
service.

Tlie
errrl use is
cept thc tube sockets, tlie input
the outptrt
norv be rervired

28.\ The circlrit is designed

markct and mrrv

up to 150 u'rrtts

ancl a 19J5

ensiest 11';1y to

to strip the chassis of

transformcr, T-2. The

according to the diagram

dipole antenna

ploys

trvo loading

\Ic.,

these coils

completely

vertical

coil (on

"G"

cap rvith

all but
all but

the

sure

metallic

antenna,

t'rdjust

Replace

the F\{-1

batteries.

listen

and

received

slug of

l.reiird.

the coil

nre

rcceiving

anvone

support rods
to

the

(for ground

a small

across

the

is

thc slug

conditions,

the two

cap.

Lift

one

trvo turns from

coils.

grid-dip

a

antenna is

objects.

rvhich

the coil

which

the antenna

Press

for

the

heard

Peak

signal

coil L-5

The slug

form.

the

circuits,

plarces

mtrde

over

of

arc u'ell

r,ou

MD-7IARC-5

is

unit

bc errsili,

for thc ARC-S,

inptrt.

volt

807's), a VR-150

tone modlrlator

adtrpt the rnodulator

to be used v'ith

Mc.

operation the

system em-

coils. For

must

be retuned.

to

the v.h.f.

the chassis

into

the case. N{ark

cap)

).

rvrencli.

out the

turn from

oscillator

Check

should

"A"

should put

crystal,

the

cirrr.ier

on

the

of coil

coils L-1,

with

the

until loctrl

should

Placing

so Éoles

in

the

after

the cover is

the

distances

the transmitter

miitched,

can heiìr.

position.

of the

and

letters

the

Unscrerv

Solder

contacts

two load-

the

the coil

into

fully

extended

the reso-

be close

by

spreading

the

assembly.

and connect

"transmit"

in a nearbv

proper

L-l

until the

L-2,

the URC-4

"receive"

be

almost

the

should

cover,

unit is

capable

up to

and

"A"

near

coil

but-

fré-

and

but-

tu'o-

cover

and

and
votr

Modulotor

Use

readilv

or other

The \,ID-7 includes

all components

trtrnsformer

available on

converted

transmitter,

for

T-1, and

modulator

of figure
a surnlus

to a

voltage

m.c.iv.

for gen-

should

an-

the

the

the

an-

in

ex-

30

TO TRANSMITTER P.A SCR€EN

(COMMAilD

ÎO TRANSMIÎTER P.A PLAÍE CIRCUI'

SETS

s+ 300- 600-

r 625

ONLT)

voLTs

^tA#lÌll'."

/

K_54 RELAI

Sunpr-us Reoro

K'r',i'o,o*

t

| ílHlrì) l"v"l
l^\zoF"mío

nìc,ue

CoNvnnsrou

n

Ri FoR 4 voLrs ar

AoJUsr
PlN I oF T1 wlTH
our oF clRcu/7. vaRY R1 to
CONTROL GAIN OF M/CROPHON€

illcRoPHoNE

Figure 28

MODIFIED

MODULATOR

T-I

ond

carbon microphone,
ing

tap on the
measured across
phone

removed.

Rectifier V-I connected across

rnodulation transformer

protective

a

as
round, red unit with black caps,
side the two
Pins # I and
T-2. The empty 12J5 socket
power

socket.

Converting

Reloy for

When converting

'ARC-5"

the
relay is usually discarded. This
for either 6- or l2-volt rnobile operation.

relay

The
employs two
pull

the armature

The armature

plated

of the transmitter.

shown
a small chassis-box,
coaxial
move between
soldered to two
side of the

and work on 24
the coils in parallel
each other.
one of the coils.

contact

Mount the

in figure 29. It may be

receptacle, and

As wired, the

MD-7/ARC-5 UNIT

FOR AMATEUR USE

T-2

ore originol

such as

cathode

resistor to

the microphone

T-2

device

for the transformer.

large, black 15K wire

3 are atop the

the

Commond

Antenno

Command transmitters

"BC"

or

(identified

series-connected coils. The

in

between the antenna and

relay

the old contacts which have

SO-239 connectors mounted

movable arm,

volts.

For

series,

as

from both directions, so to speak.

moves a spiral-wound silver-

turn

small

on a

Mount the spiral to one SO-239

permit

relay

coils are connected

To use the

with the magnetic

l2-volt operation,

tronsformers.

the T-17.

produce

jack

pins

"varistor"

is

a

and

modulation transformer,

can be employed as

Chonge-Over

the antenna switching

relay may be adapted

K-54 in the ARC-S units)

sheet

placed

the contact arm to

coils on 6

merely

wound

Tronsmitter

of aluminum,

MAKES

Adjust the slid-

six volts

#8

micro-

and 9 of

with the

that serves

It is a

is

mounted

be-

resistors.

Use

such as

pieces

pole

ground posts

on one side

been

on each

in series

wire

volts,

fields

aiding

connect to

Two pieces
readily
remote
of

these units
able for
the military part

as

turer's
anced
well suited
ing,

The
and wired
is placed
r.f. feedback.
connect

a

normal
not

being

To use the patch,
insert
If

your
permanently
tach your
and run
tach
of the phone.
the phone
transmitter.

as
of

Figure

K-54 reloy

of BC-442 Antenno

Unit is mounted

Three

reloy

Telephone

isolation,

the phone

cooxiol receptocles

terminols.

for

12,

6,

Converting

the RM-52

Unit to o Phone

of military

available

control

phone-patch

part

600, 150, 250,

phone-patch

in

the

use. Alrval,s

used.

phone

the

receiver

crystal microphone

a

on the

unit,

and the RM-53

contain

a high quality

sewice.

number

number

83718.
and 4000

for many

other

impedance

is

built in

as shorvn in

series

rvith the

A d.p.d.t.

phone

line

disconnect

turn

plug

in

has

a

connected

shielded line

patch

to the telephone

Receiver

line,

and

the

urc-c-zaaa

TRANSFORMÉR

\__/

POLE,

2

POS. TOGGLE

2

Figure

SCHEMATIC,

FROM

PHONE

RM-52 TELEPHONE

29

on oluminum

ore used for

moy

Coils

24,volts,

or

be

telephone

surplus market

The

transformer

C-280A,

The transformer

ohm

devices,

step-up,

such

etc.

a small

figure

30. A

telephone

toggle

switch is

and return

the

on the

control
the receiver
500 ohm

to the

500 ohm

to the

your

to

output

phone

FROV

SWTTCH

speech

u'ill

*'ill

RV-52

30

PATCH

Control

plote.

connected

d,c.

(RM-53)

Potch

equipment

are the RM-52

control

and

the microphone

output,

unit. Both

transformer suit-

carries

the manufac-

has

windings,

as

line

and

match-

aluminum case,

simple r.f. filter

line

patch

prevent

to

used

to dis-

when it is

switch

it

jack.

can be

headphone

terminals.

microphone

jack,

amplifier.

line

at the base

pass

norv

over

modulate your

MADE

UNIT

bal-

is

to

and

At-

At-

\{eNuer..

Vor,unm III

8l

MIXER TUBE

70 lNSERT

CRYSTAL

MARKING FREQUENCY

chANNEL 14 15t.A5
CHANNEL 45
cHANNEL 326 152.77
cHANNEL

327 454.

453.70

RECEIVER I.F

I

Xz

I

_l

t6

Xr

Xr

Figure

SCHEMATIC,

455 KC

Moke

o Single Sidebond

for Your Receiver

The

type FT-241A

plentiful

are
crystals cover the range
kc.

segments.

monic, and

jumps.

kc.
able

that are separated

kc.

1.39
(Channels

Mc.

An efficient crystal filter

of these
filter is
receiver having
amplifier. For everyday
match
selectivitv of the receiver,
Ievel

and

Anv

in

the i.f. range
and 326 to 330 all fall
standard 455 kc. i.f.

Building the The layout
Filter by

nents

should be mounted
having
top

and bottom

put

circuits

and

The

are marked 20.0 Mc.

Other crystals

These crystals

surplus crystals.

shorvn

crystals. The filter

permitting

trvo adjacent

a

small shield

of the filter.

CRYSTAL

I.F. AMPLIFIER

,

with Surplus

crystals

cheap on the surplus

of

crystals

by a

are marked

270-346).

in

figure

a 455 kc. intermediate

of the receiver.

ceiver. In

sides ) to

31 and may

better reception.

channels may

within

transformers,

the available

across

The filter

CAN

XI . LOwER
X2
L1-Lz'M/LLER t2-ct

-

HTGHER

cHANNEL
cHANNEL

(sUcH
(sucH

455Kc. t-F

3l

FILTER

Crystol

FOR

Filter

Crystols!

(used

with the BC-604)

market.

kc.

370

to 500 kc. in 1.85

are used on their

to 27.9 Mc. in

in the

same range are

frequency

difference

27.0 Mc.

may

be made from

The one

stage

be used in

use it is not necessary

greatly

will

reducing

the

be

used that fall

Channels

the tuning range

of

the filter is

space within

general,

on a small

the middle

separate

the filter

aluminum plate

(on

the input

should

These

54th har-

avail-

to

full-lattice

frequency

increase

interference

44 to 48,

determined

your

compo-

both

and

be located

As

as 4s)

100

of

34.6

four

any

to

the

of

re-

the

out-

between

can
be
tube
serted

center
crystals
kc.
handy).
new

the mixer

in

the

receiver. All

kept

very

to the

in

this circuit as

Upon

completion,

frequency

are used,

A surplus

Peak filter transformers

frequency
the receiver.
about 6 decibels,

41)

boost
filter

gain

the

may

be used for

ception.

ConveÉing

The

T-23/ARC-5

of 100-150

piece

of equipment

gether,
v.h.f. portion
is designed
er
69/ARC-5 rack. Power

10 watts into

quency

these

supply.

The

transmitter

ranges:
Channel A: 100-124
Channel B: 122-146
Channel C: 122-146
Channel D: 132-156

tube

and the first i.f.

interconnecting

short. The lead

transformer is

shown

connecting

broken.

in

tune a signal

of the filter.

tune the

(If

signal

BC-22I frequency

as well

The insertion

of the receiver

as

so

the addition

all the i.f.

loss

is not

s.s.b., a.m.-phone,

T-23/ARC-5

the

to 144

lr{c. in

two

of the

to operate from

Mc. or

transmitter

four

channels. It

to the

pieces

ARC-S radio

R-28/ARC-5

of equipment

50 Mc.

covers

a 24-28

The T-23 transmitter

output

a 50 ohm antenna.

channels

cover

Mc.

Mc.

Mc.

Mc.

leads

and the

the diagram.

generator

channel 44

generator

meter

will

L-l

and L-2 to this
transformers in

of the

of

an extra

filter is

required.

Tronsmitter

the

is

a companion

receiver.

make up the

set. The

volt

mounts in

of the

transmitter is

the followinq

transformer

should

the mixer

is in-

filter

to the

and 45

to 452.77

come in

only

tube to

The

and c.w. re-

range

v.h.f.

To-

equipment

pow-

d.c.

a MT-

fre-

THÉ T-23

Fioure

/ARC-s'V.

32

H. F. TRANSMTTTER
Cooxiol connectors J-30.|
upper left,
ot bottom
cdjustments

complished through

with connectors

of sloping front

of omplifier

"door"

ond J-302

J-307

ponel.

stoge

ond J-309

R.f. tuning

moy

ponel.

on

ore ot

be oc-

32

Sunpr-us

Reoro

Coxvnnsrox

\îe.Nuer,.

Voruun

III

The crystal frequency
quency in
the unconverted
33,

and 35, and the

Three
u'ill function
A is
rrp

of

The

by

the sep:rrate

is

shou'n fully

\'lanual.

In

transformer
ARC-5

All relays

(K-301

conversior.r is
are made
off

each steD

all cases.

transmitter

of the

converted

the transmitter

1-f625
I-i625 (V-302)
1-832A
1-8324

porver

order to

transmitter
K-30l-Antenna
K-302-Plate
K-303-Nfodulator
K-304-\lotor
K-305-Auxiliarl' plate

K-306-\Iodulator

arc removed

)

properlv

transmitter channels

on

2 meters u'ithout

to 50 \Ic.

(V-301)

(V-303
(V-301)

amplifier is plnte

\'ID-7IARC-5

converted in

use the

is incltrded

trol
interlock

except thc

outlined in

as

vou

is 1/18

Front, top,

schematic is

lsix

is:

crystal
first

second harmonic

)

r.f.

amplifier

original

in

the

employs

and

tuning control

irnd

do it.

six d.c. relays.

changeover

screen voltase

screen

plate

antenna

in

the conversion.

steps

ir.r

the

of the carrier fre-

and bottom views of

are shown

given

metersl

oscillator

harmonic

and screen

modulator.

another

tubes, a l2-volt

porver

and

and

and voltage regulator

to cnsure

correct sequence.

in

figures 32,

figure

in

(8,

alteration. Channel

. The

generator

section

stipply

relay

control

key

screen

changeover

34,

C, and D)

tube

generator

modulated

This unit

of this

filament

unit,

These are:

control

voltage con-

Thc complete

that

chnngc.s

line-

The

unit

Check

l-Cut

2-The

3-Rcmove

-l-Slip

5-Remove

fi-lìcmovc

7-Ren-rove

S-Ren-rove

9-Iìt'plrtc'c thc

10-Rt'nrovc

the u'ires

Tape

the leirds.

rcd,/s'hite u'irer
terrninals of K-305 ìs
to

the top tcrn'rinirl

ohrns

of

inal lurs
to

Tlre

(front

olrt of its
n'ard

the rvircs
terminrrl strip in

fi'om
terch it to the
sístor

f5,000
gcther.
strip in a later

tern-rinal
fror"rt

K-30i fronr
rnrtr.c

This resistol

).

the

832A

ts-o

it.

Leave

tlie

resistor

lurge,

the

of chassis ncar

brackct. Sitve

the tu'o u'ires

the cr1'stirl

together. Thev n'ill

R 317

thc'

c'ontirct

bracket.

tìie tu'o leads

ohm

Thev u'ill

the

of

encl of

thc'

tìre u'irc.s from

going

to the

comins

cut, stripped,

is in

an'rplificr'

glecn
these

qrouncl

no\\'

black 15.000

(3,600

back cnd

resistor

operation.
green/u'hite
rcliry

thc 15,000

15.0ff) ohnt

tlirec

the siclc of

1\'-301).

ancl

s'ires

c',,nnr.ct-ion

scr\'('s onlr-

sockct) of
a later

ohms-oriuìq(..

tcrminal of rcltu'

from

britcket

be attaclied

K-303

leìtvs

the relavs,

coil of relay K-305.

from one

irnd soldered

of rcsistor

the cathode

u'hite

in

olinr resistor,

1615

thc rcsistor.

from

tlrc lrracket.

operation,

of the i;,OOO ohm

the front

rvire from

and attach

ohm rcsistor

rt'sistor

K-303. K-302,

the c'lilssis

R-315

The top

r.vires

position.

from. R-315.

as rr tie-point.

oscillator

the birck

ltc

attaclied

bhre',

K-ll0ll ancl

end of the

and tie thcn-r

to a tern-rinal

the contact

it to the

brrrcket.

in

tlic briicket.

Do

of the

(300

circuit

termi-

attached

R-329

socket)

(to-

end

Ttvist

to a

red)

at-

re-

to-

and

not re-

TOP

Amplifier
tripler
shoft

ot

for rotory

VIEW

coils ore

reor.

Oscillotor cnd

turrets

T-23/ARC-S

OF

neor

front

multiplier tubes

runs

olong the side of

mounts in removoble

stoqe

Figure

33

WITH DUST

ponel,

next to tuning motor, with

COVER

next to

ore

omplifier chossis.

sub-chossis.

REMOVED

832-A's. Drive

Eoch

832-A
832-A

rE
;!

FO

E

3

T

eE

Fr

fii

'i

:a:p

îs i

rsÈ

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r!<

oo

N

F

U
F

I

t600

LJL-

st-?r

:

LU

I
U

V)

l

:!H

,;

à'

XAf
;gE

t:g

;s:

I

EìF i

;g5l

of

o I

erl

I

c--l

I

tr5ó

I

'

r-1 l'ì

tlrl

tr{r-1!

34

I MC.

CRYSÎAL

J307

PIN I

RFC

24X

200

(A)

1

625

OSCILLATOR

v30l

RFC

500

*?,î"

*.'

J

3NA

MULTI

CONNECTIONS

1625

PLI€R

v302

@

îî

l6?l
l-l

J 307

PIN

3

,I

-

-

2
3-BLANK

4- GROUND

5-FrL.

6.SCREEN CIRCUIT
7­A-MOTOR CIRCUIT

PLATE

EXCIÎER
ExcrrER ScREEN crRcurr rrRu Rgrg

CTRCUfî

AMPLIFIER.

B+

MULT/ PL/E R

832A

V3o3

CIRCUIT

832A

(MODULATED)

Sunpr,us

3

Reoro

MOÎOR MODI FICAfION

CoNvunsrox

'oog

C3a3

I I ar2

l-PF-í

RELAY

II

I

=

J 304

PIN

2

Reloys

A-12-volt f iloment

B-New

C-Bondswitching

D-Schemotic

UNDER-CHASSIS

K-303, K-302, ond

receptocles ore

J3O7 USED

FOR METERI

Figure

plug

octol

modified

of

Figure

VIEW OF

K-305

ploced

ore

between

3ó

T-231ARC-5

circuit

to

motor

for

reploce

circuit

r.f.

J-308

circuit

35

T-23IARC-5

mounted to

1625 tube

modif icotions

TRANSMITTER

of

side

chossis. Crystol

sockets.

J 308

PIN

J

308

PIN 7

6

&

,il

'*

Mewuer-. Voluun III

35

ll-Install a terminal

terminals
the

12-Attach

of the terminals of

l3-Attach

second terminal

l4-Attach the

K-303 to

l5-Locate

lay K-302. Locate
ing
wires
of the

l6-Locate

going
red,
Solder
fifth terminal

l7-Remove

attached to

l8-Disconnect

and the red, green,
ceramic
resistor

l9-Cut

Tape
against

20-Remove

a cable clamp
side

one ungrolrnded
2l-Attrrch
22-l-308,

should
for convenience.
time
nal
socket. Do
this
ferred.
in its

23-Cut

rnove

iR-330,
capacitor
K-304
stitute a terrninal
tie-point. T:rke
the K-304 u'iring
terminal. Ttrpe
insulation,

24-Install a lerrd

terminal strip to
on the

25-Locnte the

(C-329A,

Disconnect

in

the space left

relays.

the two wires removed

the two wires removed in

two solid white wires

a third terminal

the yellow

to relay

together and

strip.

black,

the

of the chassis. Install

the

from

#t and
procedure

plirce.

all the rvires

K-305. Remove

remove

and

to relay

and white wire

these wires

of

completely

the coil of relay

the 20

plate

end

and rvire

other trvo leads

each end

the chassis,

relay

K-306

the 20-ohm resistor

7-pin

be replaced

J-308.

place

the same rvith

Remove

from the

blou'n,

associated with

from

the chassis,

front

of the

tr.vo 0.002

B)

at the base of the

the

having

strip

the strip.

of the

and white wire
the

blue and white wire

attach to a fourth

the blue and

K-302. Locate

together

the strip.

the red

ohm resistor-fuse

and wlfte

of relay

together.

so they rvill not

or to each

from the

hold

to

tie-point under

plug

on

with

Remove

Remove

it

on

until

all of the wires

and mount

J-308

connected

chassis the 10-ohm

black, black)

having

strip

green

the

cable

the other wires separately

connectins

terminal 8 of

unit.

white lead,

îive ungrounded

by the removal of

in step

step 7 to

strip.

going

of the strip.

going

and solder these

white wire

remove

and

going

to relay K-305.

and attach to the

and white wire

K-306.

wire from

K-306.

Tape the

going

the

cable next

a terminal

to the tie-point.

rear

the

an B-prong male

the rvires
the
pin

terminal 2.

to

and in its

and white wire

and attach it

the wires

pfd.

bvpass

leaving

Solder the

joint.

to relay

short out

other.

chassis. Install

strip with

the relay

of

the chassis,

rvire

from

#1 oi the tube

Continue

are trans-

the male

relay

K-304. Re-

and the 15

K-304. Remove

place

one ungrounded

receptacle

capacitors

tuning motor.

the

5 to one

to relay

terminal

(R-326),

K-306.

one at a

resistor

to the

on

re-

to

go-

tho

the

to the

bolt.

plug

termi-

plug

pfd.

sub-

from

for

the

J-308

green

and

white rvire

wire.

from
connected
motor

a

Tronsmifter Modificotion
for

ing
applied

26-Remove

coil
lay.

27-'fhe

l2-volt filament
the
nected
is

The

whites
terminal located

28-Now go

Remove
Check

transmitter for
figure

50 Mc.

2-Set
3-Remove the 20,000-ohm

R-313) and the

V-304

4-Run a

nal) of socket V-303
of socket

S-Run a second

nal)

Short

the

will norv function

the

terminal of relay
Ground this

sockets

(832-4

two solid

and

occupied

terminal formerly

wires

#7 and solder

36.

the

tube

the transmitter

(C-315,

(8324

jumper

of socket

v-304.

6-Remove coil turret 2-301

amplifier stage). Mark the
L-31r-D.

7-Remove the

it

with
spaced. Replace the coil in the
Mc.

conversion

A

crystal

and 9.0

is

V-301

17 NIc. region. Tube
region
meters.

is possible

It

replacing the buffer

to the original configuration,

cuit

is desired, there

tion

not be adapted to

could

having a frequency

is

LIc.

and

required

an oscillator

tube V-304

connected.

together

motor. The motor

parrallel

in

coil nssembly rvhen

pin

to

all connections. \Iodification

19 turns of

#8 of

the black

of \/-301

amplifier)

white wires

then attached

by the

is

now

to socket

green

the

it
144 NIc. is norv

for

a spare.

C-3f6) from the

amplifier).

wire from

V-304

jumper

V-303

plate

is complete.

doubler,

V-302 is

return to I44 Mc.

to

tube

is no reason

the two leads

instead

J-308.

and lvlrite

K-301,

terminal.

need not

operation.

single black

jumpered

next to it.

V-302

and

pin

to

l-Remove tube V-303

turret on

ppfd.

3

(tripler)

(amplifier).

from
to

circuit winding,

#18

for

six-meter

producing

is

a straight

and

replace

Tape the white

windings

of in

series.

on

24

volts. a.c.. rotat­24

volts tr.c. is

rvire from

the

antenna re-

Tape

(oscillator)

occupied

white wire from

#1.

(832-,{

the transmitter. Save

grid

(front

enameled wire, close-

a tripler to the

reworking

why a

the rvire,

be modified

On socket V-303,

should

to the

coupling
grid

pin

the 832A

terminal that

and white wire.

by the two

to the

(1625

pin

between

If

multiplier

Ground

complete.

tripler) from

channel D.

resistors

circuit of

(grid

#6

grid

to

( grid

#2

pin

#2

turret

channel D coil,

and

turret. The

operation. Tube

output in the

amplifier at six

operation

the

two-band opera-

plug-in

coming

are now

The

the

and V-3O4

for

be discon-

ground

).

pin

pin

#7.

of the

See

(R-312,

capacitors

tube

termi-

pin

#6

termi-

of socket

for

B32A

replace

50

Mc.

8.334

!Ic.

50

by

grid

cir-

board

buffer,

in-

36

Sunpr-us

Ranro

CoNvpnstoN

uTc s- 40

250

MA.

Figure

A.C. POWER

SUPPLY

TRANSMITTER

corporating

fashion, one transmitter would

this

the necessary

and two-meter operation.

urc s-31

20H

RYI

rre

400

2OO

30H 30H

S-27

UTC

UTC S-27

(FrL.)

270V.

TRANSMIÎ
swf TcH

37

FOR

T-23lARC-5

50 Mc. circuit changes. In

serve for

both six-

.)

Tronsmitter The transmitter may
Tuning

the aid of a small neon
wand may be

move

v

crimp

MA

the metal band

tuning

slugs. Tuning may be facilitated

penetrating

the eraser from

to stand

overnight. The
tial so it is necessary
with

B+

two layers of

First, adjust

right

side) for

nearby receiver

the aid of a
stage for

held near

for

maximum brilliance

the

correct

frequency
tor. Channel D is
frequency

end of the I44lvlc.

Trqnsmitter Power
Supply

oil is

grid-dip

plate

the end of
with a

placed

slugs are at a high

to wrap

electrical

the oscillator

output at

as a monitor,

oscillator.

lead

of the tube in question.

tuning with

best suited for

The transmitter
power
volts

supply,
for
tuning motor.

37. Plate
watts
the high

270

volts at 75 ma.,12

the filaments,

and 24

A suitable

input to the

(400

volts at 80 milliamperes).

voltage before you run

be aligned with

bulb. A

made from

a wooden

pliers

to fit the end

pencil.

a

pencil

if

on the threads

and allowed

d.c.

pencil

the

for protection.

tape

(turretz-3Ù2,

coil

completely

the third harmonic,

or check

Next, tune

of the neon

frequency

grid-dip

the

operation

each buffer

bulb

at the high

band.

requires

supply

at 200

volts

delivering

ma. for

a.c. at 2.5

volts at 1 ampere

supply is

amplifier

shown

stage

is

Note:

the

tuning

tuning

Re-

and

of the

a drop

poten-

center,

Use

with

when

Check

oscilla-

400

plate

the

amperes

for

the

in

figure

about 30

Turn

off

motor,

of

a

a

or

TOP

Plocement
for lineor

VIEW OF

mojor

of
omplifier

Figure

COMMAND

SINGLE

components is

is

ot right

SIDEBAND SERVICE

of

operotion.

3B

TRANSMITTER

shown

in figure 40. Pi-network

chossis.

CONVERTED

Unit shown

is for

FOR

circuit

BO-meter

*îiid

MANuel,

Vor-uvrB III

87

it is possible
in

the

832-A

Convert

Single Sidebond

The BC-458

ment. It is

to blow

plate

out the 47-ohm resistor

circuit.

Your BC-458

is part

a compact

,ri­TW-

of the SCR-274N

ear,a_

Ri loK

,orr*
ZSii: L_'-r

Into

Tronsmitter!

radio equip-

v.f.o. transmitter,

*,^

(R-316)

o

covering

range

the
T-2flARC-s).
1626

oscillator,

two 1625

This Command

verted to a

AUOIO

ORIVEP

v3

!.rztvt

of 5.3-7.0

Four

1629

power

amplifiers.

phasing-type

(Navy

Mc.

tubes

are used in

"magic-eye"

transmitter

s.s.b.

(sEE

version

the transmitter:

tuning indicator,
may

be easily

transmitter for

9 MC. OSC.

rExr,

c1

S

Vzs

eaut

is the

and

con-

either

6A L5

6AL5

AALANCEO UODULATON

C-ì-3

ppfd.

necessory.

rier

bolonce

of

slugs

C-2-Originol

ponel-driven

tor,

C-3--Originol

tor
C-4-See
C-5,
C-7-1250

coil toble

C-ó-140

volt

300-l500ppfd.
C-BA-B-C-D-ì

lvtic in

MC.

9

La

I BC.

L5

îî

| /-----------\ I

tP 9l

9 MC. AUP,

I28A6

5

9 HC.

L6

t-l

I

Figure

SCHEAAATIC, SINGLE SIDEBAND

This

copocitor

Leove it

con not be set with

L-l

ond

L-2.

oscillotor

oscillotor

ppfd.

podding

mico

0-ì 0-10-10

metol

con.

moy

unless

out

tuning

poddíng

copocitor,

pfd.

not be

cor-

copoci­copoci-

electro-

39

FL-l-Borker
T-l-20K to ó00-800 ohms.

T-2, T-3-l5K to 200 ohms. Thordorson

RFC-l-2.5
RFC-2-5

RFC_3_2.5
See

f625

.or
3vE

T

I
I

r2u t

-

BrAs

TRANSMITTER

Williomson type

phose-shift
TR-Ì7,

29.
TR-25,

29

ohm, 2-wott composition
choke

figure

&

network.

Arrow

or

Arrow

or

(use

of secondory winding).

Yz

mh.

choke

turns #18 e. wire oround 47

,,tronsmitting

mh.

43 for

coil dota

0

6ND.

Soles Co. type

Soles

Co. type

RFc

350

Thordorson

TR-

TR-

resistor.

type,,

z5o MA.

LOT LAMP

9!Z

L6 Jz

Bl

PI

3B

Sunpr.us

Raoro

CowvBnsroN

80- or 4O-meter operation. Either sideband may
transmitted, and the completed transmitter
high

stability

rvatts rvhen a 1000-volt

The

Sidebond

Circuit
tube and

1625

amplifier

sideband
quency
stages
microphone
erlv. The two
work are further
in
oscillator through
r.f. signals
signal
phase.
balanced modulator
ing potentiometers,
veloped in the output
tor

tion of the
and one sideband, leaving
band.
appearing
This signal is

quency by a mixing process
quency
This

with the 5 ìvlc. output
quency
Twenty-meter output is
nals
output
minus 5 Mc.
plate

by tuning the circuit
Data for

that

series

is

(L-4) is

Reversing

The 9 NIc.

is

done by combining

(9

is

circuit of Y-7, and

v.f.o. Peak

The complete

ed

in figure

circuitry

signal

of 9 Mc.

develop

with

are available

amplitude modulated,

These trvo

a single sideband
modulator

at the

in either

oscillator, V-10. Mixing

plus

Mc.

the difference

this circuit for

(V-10)

tubes and sockets

generated

is

Tubes V-1 and

to drive

irudio output signals from

amplified by

the r.f. output

circuits

switch S-1 will

output of the balanced

amplified by V-6.

signal must now

the 8O-meter

5 Mc. - 14 Mc.)

-

4 Mc.).

power

plate

command transmitter is shown

sufficient

phasing

at

signals are applied to

(V-4,
R-2,

and R-3. The signal de-

circuit of the balanced modula-

has

signal

a summation

of the
Both

the desired

C-4-L-7 to

either

output

supply is used.

circuit

39. The original oscillator

is retained,

(V-8,

at a crystal controlled fre-

V-2A are the audio

voltage from a crystal

network

tube V-3 and applied

of the 9 Mc. crystal

^12-LL

points

V-5) through

balanced out the carrier

to the

the 9 Mc.

and

"A"

but of a different r.f.

signal at 9 N{c.

the desired single

change the sideband

be changed

desired output

or the 20-meter

of the variable
is done

and eighty-meter

two signalp

signals

signal is

either 20

band is

includes

is

about

of

the convert-

as well

V-9). The

FL-l

the

T3-L2.

"8".

and

the

two balanc-

modulator.

sideband

in

tube

of

the two

appear in

obtained

or

80 meters.

given

in

The ac-

in fre-

(

9

43,

final

The
usable level.
V-8,

V-9. When

peak

s.s.b.
watts

at 300 volts.

air b,v energizing

V.f.o. operation

C-2.

The

(I4.0-I4.4

band
covers the

ple

matter

pndding

quency

step is

This is done

operated at 1000

output is

V-7 when

range

of 5.0-5.4

Mc.),

8O-meter

increase

to

carpacitor

to 5.0 Mc.

to amplify

the

in

the linear

volts

over 100

The

watts,

transmitter is placed

switch

is

obtained

by tuning

Mc.

covers

and the range

(3.8-4.0

band

the

setting
C-3
at

lower

to

the low

frequency

s.s.b. signal

amplifier,

plate potential,

dropping

S-2 is

closed.

capacitor

the 20-meter

of

5.2-5.0 Mc.

Mc.).

the

It is

of

the oscillator

oscillator

end

on the

a

of

dial.

100

the

as

prop-

net-

Two

Each

diode

side-

fre­band.
signal

fre-

V-7.

sig-

Mc.

the

figure

to

to 20

sim-

fre-

the

be

a

a

Converting
Commond

quire.
inal
below
Remove

remove

capacitor

a new
is
link
Above
plate

ponents

in
num panel
transmitter.

coaxial
power
tuted.
voltage
ponents

Wiring the
Tronsmitter

T-53,
tached

Refer

transmitter.

the

R-71,

C-65.

(C-67)

tuning

made

from

coupling

the chassis,

coil

T-54

The

new parts,

are now

figure

38,

receptacle (J-2)

plug

Also

terminal

is indicated

figure

to

ACEM

Plocement

CONNECTIONS,

Ponel loyout

the

Tronsmitter

to figure

Remove

chassis

is

capacitor

except

C-64,

Leave

of the

shaft

for

the knob

coil

above

the

are removed.

laid

and

the chassis

placed

At

the rear

is removed

mounted

(Millen).

S.S.B.

2)

is rvired.

ENT OF PARÎ

of

L3

ond

The first
Command
all

2

for

rill

the 1616

C-66,

K-53,

crrpacitor

tuning gang

oscilltitor

and

the

loading

tube

out

atop

over

the

of the

is

mounted,

and

on

the

in

figures

The

filament

first.

(

L-3,

Terminal

C-61,

and the

/1625\ / \

t-

\v8,/

Fiqure

poits

on

Figure

coil

job

is

transmitter

parts

the

rviring

of

C-Gl.

tuninq

sh,rft

chassis

coil,

sockets.

the

is

drilled.

old front

an

bacli

Placemeni

40

Next,

figures

V6

I 2BA6

t_ T_ r_

lrtLt2

rrl

a- /-

v3,12AU7
AUO

nÀS!

S.

40

chossis, top

diagram

the

original

oscilÉtor

C-62

and R-76,

is

fròm

(part

anteìna

rrncl

chrrssis,

chirssis

and

8-pin

apron is

and 41.

circuits

the

39

#5

opposite

3

V2,12AU7

C DR

VER AUO]O,

IOP

vtEW

you

The

removed,

capacitor

A nerv

socket

of

oscillator

and 40,
of

4l

connections,

to

strip the

do not

ihe variabÌe

of

relav.

other

panel

rr miniature

the

tlre com-

are wirer-l

L-3 is

view

of

orig-

wiring

circuii

Also

amplifier

and

C-63

T-S4).

and

com-

as

shown
alumi-

of

the

original

,,ìbrti-

hish

a

coil

olcl

termínal

v1 124T7

AUOIO

XTAL OSC

re-

at-

L-3

of

Menual,

of

C-61 is
wired to the l2-volt filament
and

The next step is to wire
audio filter. Nlount the )í-watt resistors
capacitors directly
space wherever possible.
four-section
control

restricted

of

diameter

X"

Now, wire the crystal oscillator,

tor, and 9
L-4, and L-5

Nlount

chassis by means of a small

Vor-ulrr III

grounded.

The

"hot"

7 of L-3 are left empty.

the audio stages

on the socket

Capacitor

can mounted to

R-5 is on the

chassis

space, R-5

(CTC

trJpe

,Vc.

amplifier stnges.

according to the

IvIc. crystal X-1 to the inner wall

I

the chassis, and

deck,

is

a subminiature

"Mini-pot").

aluminum clamp,

terminal

circuit. Pins

and ceramic

pins

to conserve

C8A-B-C-D is

above R-4.

control, only

balanced modula-

Wind coils L-L, L-2,

data

of figure 42.

citor C-I is merely the capacitive coupling
coils L-l
inch,

center to center. The leads from

potentiometers

to
Silver mica
L-4, and L-5,

Finally, rvire the mixer, V-7, and

stage.

Plate coil L-8 is
stator of
end by the 500
which is mounted on a small metnl

1625 sockets. Choke RFC-3

the
capacitor and

L-2,

and

which are separated

the link

R-2

and

R-3

are twisted

capacitors are employed across L-I,

and also across

L-7.

the 1625 amplifier'

supported at one

loading

capacitor C-6, and
ppfd.

TV-type

coupling capacitor,

at the opposite

bushing betq'ee'n

is placed

the oscillator shield,

as seen in

end by th.e

beiu

of C-61

#1"

and the

balancc

Because

of

the

Capa-

betweerr

about one

coils

together.

L-2,

een the
the ton

is

6

a

Jì'.

Adjusting
Tronsmitter

L-'l

L-2,

,

tuned form,

"cold

L-3---Originol
L-4-8

Link, I

L-7-3.5

5

/

rc-4), l4 Mc.,25
form,
tor

L-8-3.5

diom.

l"

COIL

photograph.

view
ed to
to the
from
on
of the line

mine that
npplicd
porver plug.

the front

panel.

capacitor

the rear
As a last

bets'ecn

L-5, L,é-25

end"

oscillotor

turns

$ìó

turn ot

Mc. 39 turns

|

6" diom., tuned

5/16"

(C-4).

46 turns

Mc.

(3.

& W 30ì5)

diom., |

-

TABLE

Capacitors

panel,

A

short length of

turns

ì

5

ó" diom. Link

/

see

coil,

e.,

slug-tuned form,

center

fi26

by ì 50

turns

diom., tuned

ft2O,

FOR

14 Mc. 12

43

S S.B

5/8" long.

Figure

C-5 and C-6

with

fi22

figure

e.,

#22

by

ló

turns

their rotors

C-6 to coaxial receptacle

of the chassis. Ground

at both ends.

step, check all your wiring

the

S.S.B.

Adjustment
ter is done in
plug in

filaurents operate rvhen

the

filrrmcnt pin

thc

all

Rcmove all tubcs except

89

e. wire, slug-

4

turns over

4l

5/16" diom.

slug-tuned form,

ppfd.

copocitor

e.,

slug-tuned

ppfd.

56

per

turns

copoci-

inch, l"

rt14,

EXCITER

mount-

are

grounde<l

coaxial line is run

mounted

J-2

the outer shield

against figrrre

of

this transmit-

steps. First,

tubes and deter-

12.6

volts is

ground

and

the

of

the

oscillator

Figure

42

Under-chossis view of S.S.B. tronsmitter. Audio

spoce

behind one 1625

of old omplifier tonk copocitors.

tube

f rom

C-ó

socket. neor

to

cooxiol output

center

jock

Coils

of

J-2 on

system components occupy

L-l

chossis.

reor

L-2

ond

Cooxiol

of chossis.

ore

leod runs

mounted

w

#

I

I
I
t

I

t

im

;

:ti::ta::ii:.l

.{0

Sunpr-us Ranro

CoNvpnsroN

V-10

tube
volts to the

listening
Acljust
to bring
plug
of coil L-2

Yon

justment

(such

tor
emploved
injected in
I-6

are

u'ith

of

#5

of a nearby receiver held

As lone
at thc sidcband fre<ltrencv
L-7. [,et us iìssrlme,

is

tlrned to
and listen for
modulated s'ith
that is the difference
rluency,)
for maximum
and adjust carricr baltince
R-3 for rninimum

Tlie audio baliurce controls

L-2

irre best adjusted
using
ere'd in detail in the Reoro

Editors
Hirndlrook Singlc Sídcbund
lislied

tlie ve'rtic'al

to coil L-ti, and
ing onlv thc 9 N{c. signal

and

trtrnsmitter and check

to the 5 \{c. region in

capacitor C-60

tlie 5,3 \Ic. dial

in

tube V-2 and listen

until the crystirl

norv nced an nudio

step. A high

as the Heathkit AG-10 or AG-9A

A lorv level, 1200

).

microphone

peaked

:r viÌclrum

socket V-7 to

as the audio signal

B0

and the frequencv

"rippler"

Errginccls.

rLrrd

br.tlre

Amcrican

pliitcs

regulator

the

(atop

point

quality,

jack

for maximum

voltmeter

tube

ground,

iìs iul example,

meters. Tune

the signal. You will hear

thc 1200 cycle

betu'een 9 lvlc.

signril.

ptrtterns.

Next,

signal.

rvith

SrrmmcrlLrnd. Crrlif.).
Radio Relay

of tlic

oscillator

These adjustments

'scope

tube V-10 is removed.

tube, V-11. Apply

v.f.o. operation

a nearby receiver.

the chassis, see figure

down to

at I Mc. Adjust

stage oscillates.

oscillator for the next

low

cycle audio

Coils L-4,

J-1.

9 Mc. signal

connected from pin

or with

close to

is applied,

u'ill

iìppeitr

your

receiver
tone

of the v.f.o. Adjust

turn off

potentiometers

and

the

aid of an oscilloscope

l{-lroeoor

Radio Amateurs, pnb-

for

tube are link-couplcd

input

to V-7. The

5 Mc. Now,

the

distortion

should

signal is

L-5,

as measured

a antenna

pin

#5.

a signal

in

circuit

that this

to

80

a

at a frequencv

(the

crystal fre-

the audio

R-2

coils L-l and

are

(

nublished bv

or in

League.

In

300

by

2)

slug

acl-

oscilla-

be

and

lead

C-4-

circuit

meters

signal,

L-7

signal,

and

cov-

the

brief,

leav-

'scope

pattern
Listening
allow you
upon
audio level
vent
ter. Couple
gain
controls R-5

'scope
L-2 for

low
times. Also rebalance
and R-3 for minimum pattcrn.
srvitch S-1 rrnd recheck
strive
setting of

reached,

and connect u microphone
clean
Lineor

Adjustment

teries
250
of
milliarmperes

R-3 and
plute
iurd tune this stiige
mcter opcration, cirpircitor C-7 n-mst

the output

dcpcnds upon tlre ir.npeclrrnce' of
iind
starter,
able capacitor and use

capacity.

u'ill have

to the 9 \Ic.

l"rear

to

the speech svstem.

should

overloading

tlie rcceiver

prcvcnt

to

patteln.

minimum ripple. Kecp

possible,

as

to obtain minimum

srvitch

disconnect

s.s.b. signal at 9

Amplifier

jurnper

and

)

volt supply,

the tubes. Resting

or

you

circuit of the

jack

rvill

varv betrvee'n 300

parallel

:i modulation

the 1200 cvcle

be helci

the

overloacling. \rxr',

and R-4 for milin'nrnt

AIso

trnd

S-I.

Plug in the 1625
about
lislrt

high

plrrcing

so. Unbalance carrier

rvill obtain an B0-meter

linear

like

J'2.

tn'o scctions of

in

signal

phasing

to coil L-6

adjust the slugs of

go

over the adjustr.nents

the

cirrrier

1'our

Once this

the audio

\,Ic.

-18

batteries or small

voltage tern'rinal P-l

250 r,olts

plate

stage. You cAn no\\r resonate

anv otliel amplifier. For

Thc vlluc

rrpfd.

it for

nearby

a

audio

During

irs lou'

"ripple"

to

as

svstem of tlie

the

ltalar-rce

lìeve-rse

adjustntents. You

qcnerrìtor

You should hear

J-1.

volts bias

on the

current n'ill

of tlris c'irpircitance

tlie iintenua svstem,

nnd 1500

a broirclciist-tvpe

C-7. Sct it irt maximum

"ripple"

adjustments,

possible

and

"ripple"

rt'qrrrclless

poirrt

tubes and applv

be

upon it.

receiver

tone impressed

to

transmit-

leduce

adjust balance

on thc

coils L-l and

audio

level

several

controls R-2

sideband

shoulcl
of the

hirs

been

'scope

and

(use

flash-

"C"

to tt:e

plate

circuit

be about 90

control R-2 or

ppfd.

in

across

As a
vari-

carrier

placed

rvill

the

pre-

the

as

a

bat-

the
B0-

Figure 44

,,COMMAND"

TRANSMITTER

MAY

EASILY BE

CONVERTED

HIGH

POWER

INTO

S.S.B.

LINEAR AMPLIFIER

250 wotts

run

by inexpensive ìó25

tubes

regulotor tubes

peok power

(center).

Voltoge

ore ot

reor of chossis.

is

MeNuer-,

Voluur III

4l

After

250 voìts,

or

so. Tl-re bias

rrrised

ma. at 1000 r'olts. For

bias should be adjustcd so that

voltiìge

po\\,er inpr-rt

input

voice

120 milliamperes ol

Convert

The

lincar rrmplifier for

lunning

of

good

a
c'xcitcr,
feu' n'irtts of

bnnd.

For

T-19

ARC-5) or tlic

ARC-5) trirnsmittcr mriv be usecl. For

5.3-7

havc

vou

voLr can boost the

until the

and the

Your

S.S.B.

Command transmitter n,akes

rr

linear

for

or

S0-rnetel opcr:rtion,

,BC-,158,

\lc.

become familiar rvith

plate

voltage to 1000

voltage

no-signnl pl:rte

no-signal plate

of 35

signal, tl're

for the 1625

plate

other

s'atts

to the tl'o

plate

current

so.

Commond

current

the

current results

Tronsmitter

Lineor Amplifier

,10-

or S0-mcter operation,

peak po\\'er

amplifier for the l0A
any s.s.b. excitcr ciipable
porver

input

of 150 t'atts. It

in

the 40- or

the 3-'1 \lc.

"1-5.5

or T-21 ARC-5)

\lc.

voltage

tubes. Under full

or 20A

60-meter

(BC-457,

operation

tubes should be

is

about 35

values,

product

kick

r,vill

at

voìts

the

of the

in

up to

to

an excellent

capable

makes

sideband

of deliverinq

amateur

(BC-696,

40 rneters,

or tlre

or

or T-20'

the

7-9.1

a

o

Fiqure 45

SCHEMATIC, S.S.É.

MADE FROM A

a

C-

l-300

L-l-Adjust

C-l

B&W

or
turns
optimum

RFC-l-2.5

TRANSMITTER

ppf

Bud MC- I

d.

to tune to

neorly fully

3907-l coil stock

per

inch). Adlust

looding

mh.

LINEAR

"COMMAND"

Bó0

output frequency

meshed.

ontenno

choke

"tronsmitting

AMPLIFIER

with

Air-Dux

(2"

ìó.l0,

diom.,

top for

type."

l0

ffi

UNDER-CHASSIS
Screen
tube sockets.
chossis.
Tuning copocitor

resistor R-l

Plote tuning copocitor

Shielded

Fígure 46

VIEW OF S.S.B.

is mounted to

wire is employed

neor diol is not

reor

extension drive shoft.

LINEAR

chossis obove

of

ì is od

C-

for filoment, screen, ond bios

used, serving only os o beoring for

AMPLIFIER

the voltoge

justoble

through

regulotor

side of

leods.

42

VIc. (BC-459,

used.

Power requirements

peres,

150

350 volts

ma. plate potential.

Conversion to

Service

conversion
grid

screen

plate

The
ponents.
C-64, and
sockets.
capacitor
Above
the loading
rotary

of

coil.

Voltage

circuit

circuit is

first

Beneath
all small

Remove

C-67.

the

chassis,

coil. Remove

link

rvires.

Wiring

Lineor

graphs
socket

VR-150
two empty

Tap

the

Amplifier

given

are

replaces

and

octal

on

#1
as the r.f. input
mav

be controlled
transmitter
of

the linear

C-1.

retained

The

to act as

for

old,

shaft.

Plate

coil L-l

seen in figure

iìnce

on

80 meters
meshed,
aboutTí%
ed

and 4O-meter

meshed.

to a coaxial receptacle

ttor'C

^î-22,1ARC-5)

or

at

S.S.B. This

the oscillator

of the final

also required.

step is

R-75, R-76,

Remove

remove

control.

in

the rear power

VR-105

sockets

the old oscillator

circuit

greatest

amplifier

ganged

a bearing

is

44.

It

The antenna

,.o',

n

ll

"'

[

\(

ì+. r-l

H

U

OUTLINE DRAWING

VACUUM TUBE,

']

"^-

tI#^

"^

UUT

TEI

> .i6

MAX

CONNECTIONS

transmitter

are 12.6

35 ma.,

and

500 to 1000

conversion

removal

of

auxiliary

coil

to form

regulator

tubes are

amplifier.

to remove

the chassis,

components

the unwanted

remove

on the

and

relay

K-53, and

the

antenna relay

plate

the

Remove

all loose

A schematic
Command
45, and top

figures

set is

and bottom photo-

44

and
receptacle,

regulator

at the

tubes are

back of the

coil

for

the amplifier.

bv

tuning

grid

uses

capacitor

mounted

the main

drive.

a new

is

for

the oscillator

above

should be pruned

occurs

with

resonance

tap on L-l

mounted

GFjD\\\\.

2l

32

Figure

47

OF

SHOWING

may

volts at

0.9 am­volts at

entails the

the oscillator

equipment,

and the

an amplifier

added

A new

to the

amplifier

com-

R-71, C-58,

three rear

auxiliary

resistor

tube

padding

R-78.

K-54

coil T--54

and

leads

of

the converted

shown

46.

in figure

A five-prong

J-64.

placed

chassis.

(T-53)

is

userl

Excitation

dial

o{

plate

The

tuning

not

capacitor,

used,

circrrit
but is

tuning

the

chassis

so

that reson-

C-l

almost

occurs

with

is

connect-

fuJlv

on the front pancl

//,-*EAîER

-<6\\.\

/ // -

"

///

llLt e.td'l t9' l

ltr

"'

\\--1l' /

\v-HEArER- /

\\\GR|D \

"

Y/]1

^'/." l

,*'F- ,/

gOTTOM

VIEW

600

W,E. 70I-A

TERMINAL

and

and

the

and

The

the

as

C-l

600

\

be

Operotion

resonance.
justed

the
of

no-signal
excitation,
about

rn

300 peak
readjusted

optimum

able
sical
gests

plifier.

lator
rvíth
glass
outline

Western

experimenter
tube
there
glass

|

amateur

of

the

amplifier.
meter
purposes.
grounded

line is
tor, Pin
metal

Lineor

350

is
curr-ent

small

ing
amplifier
ding

plate

may

Pins

to the

bypassed

#3 of each

shell

Amplifier

volt_

supply

varied (about

oJ the

s.s.b.

dial

varied

is

capacitor

circuit resonance,

for
should
current.

be

adjusted

When

1625 plate

1000

volts.

plate

maximum

125

ma.,

watts.

at

antenna

Using the

The

large

on

the-surplus,market

size

of

that

it rvould

The

tube is

operation.

plirte

tlrc

bulb.

of

tlie

Electric

should

should

envelope.
The pulse
Heater
Heater
N'Iaximum
N,Iaximum

Average
Peak
Plate
Screen
The

\-oltage.

Current,

pulse

dissipation

dissipation

suggestt:d

service

Sunplus

An

be

with

placed

and

#6

metal

with

a similar

Bias
amplifier,

external

in

a 0.01

socket

0-250

the

B-plus

#7 of each

shell,

and

r,fd.

is

capacitor.

voltage

and

is temporarily

for

tune-up purposes.

-18

amplifier

signal

is

until a rise

noted.

C-60 or

Plate

tuning

optimum

the amplifier
voltage
Bias

current

volts)

applied

It

may

antenna

for

sliould

untíl

is

about

to the input

in

the

be necessary

the

slug

"apacitot

and

the

loading.

about

30

is

may

be raisèd

be

adjusted

of

about

average plate

providing

The

the higher

a

s.s.b. input

antenna

value

tap

loading.

Western

7Ol-A

\Vestern.Electric

the tube

make

a

It

has

terminirl

Connections

fube are

153A

can

easily

be

mounted

be

a free

modulator

7.5

plate

voltiree

screen voltagc ,'pulse),

plate

currcnt

plate

cliiss-C

are:

Terrode

701-A tetrode

for

(Tó"

tetrode intenclecl

an indir.ectlr

of the

shou'n in figure

socket

circrrlriti'n

r.olts.

8.0
arnpe'res.

currcr.rt,

(pulse

(pulse),

a lou,pricc.

high,

good

a

trrbe

to

the

mirv

bnild his

in

a r.crticrrl

ratinqs

ir.c.

(ptrlse),

(pulse),

l0
100

).

15 rvatts.

operating

of

Ranro

ma.

lead

1625

"hot"

the

ceramic

also

bypassed

is

applied

the

connected

the

no-signal plate

g0

milliamperes.

plate

current

to adjust pad-

of

coii

T-53

C-l

tap on

ma.

coil
regulator

oif

operating

to a maximum

35

ma.

current

signal

on

coil L-l

plate

of

Electric

4t!,'

diameter)

high

po\\'er

for

ìteatcd

.rt

tlre

terminirls

-17.

bc

ou'n

position,

of irir

tl.re tube

or

d.c.

12,b00

1,200

B0 ma.

amperes.

rvatts.

conditions

CoNvensroN

d.c.

milliam-

for

tune-up

socket

disc

­B-plus

Bias voltage

and

is

tuned
L-l is

Resistor

to provide

únder

voltage

ltLrlse

ton

A modified

rrsed,

socket,

around

are:

volts.

volts.

filament

capaci-

to the

to

the

lead

to

the

the

tun-

of the

io obtain

ad-

R-l

tubc

properll,,

full

rvill

of

about

may

for

is

avail-

The

phy­ìug-

r.î.

aÀ-

modu-

cathode.

of the

and

the

or the

,The

and

the

for

arè

for

be
be

A

a

MeNueL,

Volunan III

67.5 V

lrlrlr

Figure 48

SCHEMATIC, MODIFIED BC-I

METEOROLOGICAL TRANSMITTER

Filament voltage,
Filament
Plate
Plate

current,
Voltage
current 350 300

Power Input
Plate dissipation
Screen
Screen

voltage

current 40 40 40
Screen dissÍpation
Grid voltase

Grid

current 1,5

Note: It is

screen clamper
cessive

screen dissipation.

Inter-electrode

Input
Output
Grid-plate

Converting the

Sensitive

The

BC-1253
in quantity in
verted

high sensitivitv,
receiver

etc. The BC-1253 r'"'as originally used inlveather
loons
back
strong cardboard box that is

balloon. A lightweight battery

transmitter on

tube as a
oscillator built
circuit.
shorvn
for the conr.'ersion are to

ponents,
make

to an excellent

is

suitable

to send upper-:rtmosphere r,veather information

to earth. Tlie transmitter

its

The BC-1253

milliwatt oscillator,

The converted circuit of the oscillator

in figure 48. Note that the

chtrnge

the rviring changes shown.

7,5 volts.

7.0 amperes.

2000

2500

3000 3500

250 250

750

750 750 875

220 200 f60

400

400

400 400

20 20 20 20

-150

-150 -f50 -150
t5 15 15

suggested that a 6Y6-G be

tube to

protect

capacitances :

the 701-A

15.6

8.5

0,16

BC-l253

Rodio

meteorological

the surplus stores can easily be con-

good

for

flisht into
emplovs

into

the value of the 955

Control

transmitter, available

radio

control

stabiìity, and

in

use

the end of a silver-plated

model airplanes, boats,

is

contained

attached to the soundinq

pack

heavens.

the

a single 955 acorn

ivith the socket of the

only steps

remove

the unnecessary

253

(volts)

(
(watts
(watts

L75

(volts
(

40

(

(volts
(

used

from ex-

ppfd.
r,pfd.

prfd.

to o

Receiver

receiver, featuring

light weight.

in

a smaìI.

accompanies the

necessary

grid

resistor,

fERMI

STRfP

*a.

ma'

watts

*u.)

as a

The
bal-

triode

tank

com-

and

G_ BAND SECTION

NA

L

6-AANDé I-aANO

1D8

GT/G

.o1!F

-1.5V.

+1.5V.

-135V.

Figure

SCHEMATIC, MODIFIED

TEST

drilled

additional
variable
tuned
trimmer
capacitor
Varying

permit

complete band.

for maximum
plate circuit relay (
pull
checked
50K
meter. Adjust

the spring tension so that the relay pulls

I milliampere,

insert

just

pulls

is

the relay drops
picked
to
ceiver sensitivitv.

off and the

parts.

compression trimmer

circuit line.

up and down the lines

to

the antenna tap and the

the detector

A super-regenerative detectol

in rrt 1

by connecting the relav coil in

potentiometer,

the relay birck into

the variable

in.

Next, back off slightly

up by the

pull

in.

It is necessary

hit the 2 meter ( 144

sensitivity. For optimum

milliampere of

the

nnd

plate

out.

receiver

Adjust the irntennil tap for maximum

provided

space

It

will be necessary

remain in

to

Sigm:r t,vpe 4F

plate

tr 45 volt battery',

point

spacing of the

drops out

the

voltage control
A nearbv

should now cause

I_ BAND

100 !!F

+135V

49

BC-IOóó I.F.F,

SET

used

to

add a 3-30

capacitor

while

lvlc,

)

tuning
oscillation

circuit is

should be

)

cr-rrrent.

and

at about

receiver

circuit and

until the relav

on the control

2-meter r.f.

4iì

SECTION

to mount the

ppfd.

across the

to slide the

adjusting the

amateur bancl.

capacitor will

across

the

employed

results, the

set to

This can be

series rvith

a milliam-

contacts

in

0.8 ma. Nolv,

and

at about

ad-

until

signal

relay

the

re-

a

Conversion
Control

that
removed.

Receiver

it is mounted

To do n

to o Rodio The

circuit
nections

All

on.

neat

connections to this

job,

the contact

original transmitter

uses several

on a socket strip

pins

con-

strip are

should

be

Converting

the BC-l06ó

144 Mc.-220 Mc. Receiver

The BC-1066

lator intended to check the operation of
*I.F,F."

radio equipment.

Test Equipment is

The BC-1066

a dual v.h.f.

to o

oscil-

the SCR-695

consists

of two

44

Sunprus

Raoro

CoNvnnsrox

q

}{

6

;

\ì

;e

le

sb

TCr04

=.o02

PANEL

GROUNO

METER

METER

swrrcH

cr80

.o02

'::oo2

'd

ll
ll+
tl-o t

Jtoz

/

StOt

/

I

I

to2

tc

l5l

/

RFAMPLIFIER

MULT

IST

a\

Y

I
I

54.7-74.7UC

a

I
I

i5l

eo:

aov cl$

EJN

eF

I f-^' -l

(

I

Ò

ct06

utaF

rî)

\-/

Tu

ie

rì

zND.

IST

MULT

OETECTOR

f

o

---

cil2

touuF

ì

:

R ro4

3w

2.4

Rr44

2.4

Rro5

6CA

,vlt4

osc

IVER

RECE

CR Y STAL

Rtrt

z2oo

rso

c

I
L*

I

[ooos

ll

!;

rl

ti

60i60Mc

tl

2ND

c>

s,o:l a

L -

I AMPLIFIER

I

/

I

souètcx

ANTENNA

COUPLI NG

ANTENNA

1!13

sf NS/T/v/Ty

ANTENNA

t­esf- -

f ìl
I tl o

at

-J

Kro4

rALK

PELf ASE

ro

L/ STEN

ppf

cp

ss

TUNING

SlO3

-

-

IF

3RD

afltioMMf-

cuT seuELcH

AMPLI FIER

,,1

loP
t\;

trl
rî

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oì
o
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E
o

!

a,
I
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E
0
I

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o

gl

o

i5

Figure

SCHEMATIC, NAVY

TRANSMITTER-RECEIVER

50

TYPE

COL-430ó5

(MBF)

t
rl

È

.9
o

0,
0ì
E'

q

E

o

q,
f

E

o
U

E

o

gì

--+-

srvc

MeNuer.,

VOLUME

I

ls

,3è

2ND

DETECTOR

I

I
lct

86

=

..tr

l.ol

T

nrao Èv*

VolulrE III

6AQ6

v t05

T

U

(\/

!ì

(J

6C4

vil6

ct4?
.ot

Rr36

AF

?526

vr

ORIVER

rE

RECTIF IERS

t5

AF POWER AMPL

POLARITY

6C4

vlic

RECTTFIERS

7

(voruue

I

sr ol

coNraou)

ON-OFF

r57

c

.oo

il 5vAC

il5vDC
J ro4

45

HANOSET THEMATIC

EXTERNAL

J

NOÎE:

UNLESS OTHERWISE SPECIFIED:

ALL RESISTANCE VALUES ARE IN

CAPACITANCE VALUES
FARAOS

ANO INOUCTANCE VALUES

HENRIE5.

o
z

2

I
ú

z
ù<

ro5

AUOIO

ARE

OHMS,

IN

MICROMICRO.

ARE IN

vll6

vl23 vlos

SCHEMATIC,

TRANSMITTER-RECEIVER

vlo6

Figure

vt02

50

NAVY TYPE

vro3 vror vt24 vt22

COL-430ó5

(MBF)

vil5 vil7

vil4

vlt3

cte6

fgoos

46

Sunpr,us Ranro

CoNvnnsrox

the

super-regenerative
I.F.F. bands. The
picked

turning a series
by the
sive
tubes
audio amplifier.
over
bands. A
audio output
fied by the

Conversion

V.H.F.
The original circuit

It is

choke

connect a 10 megohm,

N{c. band by adjusting the
I-band

adjustmcnt of

draws onlv a small amount of current,

cell,

months.

or iìny
mounted ntop the

tive tr-rned circuits rvill be

rvork.

up by

receiver

surplus item consists

used as v.h.f.

ranges

only

The G-band

plns

close

panel

IDB-CT tube.
to

Receiver a sensitive

necessary to unground

in

the 957

receiver rvill

trvo small 67)í-volt batteries
It is

porterble

detectors,

weak

I.F.F. set,

the

of coded

portion of the BC-1066.

detector-oscillators,
The two tuned
to the I44

srvitch

of either detector.

The BC-1066

o

teur 144
of the unit

circuits.

)l-watt resistor to

receiver can be tuned up

tune

the padder capacitor. The

an excellent

v.h,f. use. Trvo

case and

Conversion oÍ

I l5

R-9/APN-4 makes a
converted for 50-60 cycle
erates on

selected by the main channel switch. In this conver-

be
sion,
your light line,
tion
in

the

Receiver

Conversion

2-Rerr-rove the rvires from

3-Cut arr'i,ry the rvire

4-Remove

four

the power

rvithout

receiver for

Section

panel

and install a
the center u'ire
nection

Splice

Tape

the

and pin

its hole
the center terminirl of the
ground
volume control.

A,C.

Volt

preset

auxiliary equipment. The 1400-volt supply

of the

the

rvire

#t

J-103

a 3K

one other

channels, any one

supply

and the

rvires

of 6SL7 socket.

is

receiver is modified for

Loran'scope tube is not used.

the

Check
conversion.
l-Remove

phone

of the coaxial

jact<.

together near the 6SL7 socket.

joint,

betrveen

(blue)

potentiometer.

terminal. This

tunable

pulses

pulses which could

(I-band:

of the

which

of two

type 957 acorn

Mc. and 220

receiver

Mc. and

is

In

series

padding capacitor, and the
to 144

receiver for

)í-rvave

link

coupled

satisfactory

R-9/APN'4 for

ó0 Cycle Operotion

good

160 meter receiver when

operation. The

adapted

off each step as

J-f04

jack

"Filter

the

pin

leave its

but

over

detectors

responded by

be

inexpen-

This

1D8-GT

and a

circuits are

Mc. amateur
G-band) selects
The audio

can be converted

shown

the end of

with this choke,

Mc. rvith a simple

rvill last for many

for operation from

in its hole. Solder

cable

In-Out"

#8

Connect the rvire to

potentiometer,

is norv

is ampli-

for

the

220

Mc.

in figure

each r.f.

ground,

to the

BC-1066

and a size

"Field

whip antennas

to the respec-

portable

for

receiver op-

of rvhich can

you

(red)

from the

to the tip con-

of 6SN7 socket

*'ire. Install

the audio

two

were

re-

heard

triode

tunable

the

to

ama-

bands.

49.

220

Day"

opera-

do the

srvitch.

and

Power

Conversion

D

l0-Connect center
ll-Install

l2-Protection

Supply

2-Remove

J-106

3-Unsolder

#l

to terminal

4-Remove

and connect
J-106.

S-On T-105: Nlove

wire
other end of
holder.

6-Connect

of old
rvhich rvent

"Filter

7-Remove blue rvire from

nect in its place
to
wire

8-Remove the voltage

together rvith its

line voltage

loose

9-\Iove

to the

(blue-rcd
originallv
other cnd of this red-black ri'ile
of

minal boerrd rvhere

the
Connect los'er pair
pilot

in

ormer. Place
series
and
ers is indicated bv a voltirgt' of

#12

be
operation.

the rvires

and the

the black

of T-105)

the white v'ire from

Tape the end of the *'hite

from

side-lug of spiue fuse holder

"Filter

Out-In"

go

to the line

end.

end of

red-black

point

tu'o) to

srvitch 5-103 in

center terminals to tenninal

lamp receptacle.

series rvith

u'ith

Sarfe operatinq

#3.

and

indicntcd

Converting

Receiver Íor 6 Meters

The Navv
COL-43065
range. It u'ill operate
\{BF has crvstal contlollcd

in

channels, btit nral

tuning.

The follos'ing tubcs irrc

50.
connected

is desiqnccl to opcrirte in

)

The schernatic

in series-parirllel across the 115 volt line:

Section l-Remove

and switch
voltage

between

power

from

#3

terminal

terminal

this wire to end-lug

Out-In"

to S-I03

srvitch mounting hole.

resistor

on the

on R9-B receiver)

terminiited

potcntiometer

from heavy

three 200-u'ertt. 1Ì,1

the line, using printarr-

#13.

across ternriniLÌs

srvitch.

(rvhich

rvire

strrndoff insulator

of

J-106.

of T-105

#3

(blue-red

blue

to terminal

#2

switch.

to other tcrminal

switch.

end-lug

the white-black

voltage switch.

control potentiometer

series resistor

R-128.

wire from

terminal board where blue

(see

R-121

termintrl of

green

rvire

J-102

of terminrrls

current

primarv

Ninetr'-eisht

s'incìing

voltage

the MBF

\IBF trarrsrnitter-recciver (Navy

frorn 115 r'olts,

rccc-iving

br:

c'onverted

of the \IBF is

r.rsed,

J-102

).

pins

goes

terminal

rvire.

on Rg-B receiver)

Solder

of F-101 and con-

lead rvhich

and re-insttrll in old

terminal

rvire from

step

5). Solder the

(find

in its ner'"' Iocation.

R-l!l to

'rvrrs

holc-.

to

sulqe. rnust be used

of

volt

for

5li across terminals

to 100

:l

and

Tronsmitter-

and transmitting

for

manual receiver

shorvn

u'ith their filaments

(yellow)

5-103

and

#3

to terminal

and resolder

#3 of T-105

pin

to

#3. Solder

of spare fuse

to one

rvhite

Tape the blue

Ground the

#2 of T-I04

correct one

point

connected.

Run n'ire from

=11

of

"liot"

porver
light bulbs in

terminals

the transform-

volts should

#3

the 60-80 \,Ic.

a.c.

or

#4

#4

of old

R-121

R-121

on

T-104.

lug of

for

d.c.

in

figure

(line

ol

of

side

wire

used

ter-

trans-

#1

sood

type

The

MANual,

Voluun

III

6A

v

K5

roa

GREEN

LEAO
TO METER
swrtcH

47

6AK5

Transmitter

tubes
V-101-Transmitter
V- IO2-Frequency

V-l03-Second

V-104-R.f . power

Receiver

tubes
V-108-R.f.
V-l09-N,Iixer,
V-110-5.3 N'Ic. i.f.
V-l11-5.3 Nfc.
V-lf2-5.3 trfc.

V-113-Injection

V-114-Injection

V-115-A.v.c.
V-116-Second
V-1 l7-Squelch
V-123-Noise

\'Iodulator

and Pos'er
V-105-A.f.
V-106-A.f.
V-107-\Iodulator.
V-1l8-Rectifier.

V- I 19-Rect if
V-190-\lodulirtor,
V-191-Not
V-122-Rcìru'
V-124-Relav

Receiver
for

Remove
trvo receiver
also be
chassis
al bolts

rvhich

Modificotion

50 Mc.

the

scrervs
stages.

removed.

to the transmitter

holding

should
and u,ashers
later.

Nou'

the receiver

tion

of the
rnain
assembled,
you

rvill

*'iring passing

cl'rassis.

for

either

{A)

oscillator,

multiplier,

multiplier,

amplifier,

amplifier,

6AK5

amplifier,

i.f.

amplifier,

i.f.

amplifier,
frequency
crystal

amplifier,

detector.

:implifier,

limiter,

supply

nmplifier,

drir.er,

6C4

28D7

252;6

ie,*.

2ó26

28D7

usccl

rcctifier,

rectifier,

Operotion

and

The

This

the

receiver

be rernoved.

in

a safc place

chassis

Do

not

turn

if

the chassis

blorv a fuse

A-Modified

B-Modif

C-S-meter ci rcuit

6C4

6C4

6C4

28D7

6AK5

6AK5
6AK5
6AK5

multiplier,

oscillator,

6AQ6

6C4

6AQ6

6C4

6AQ6

6C4

6C4

First,
the case,
s'ith

cover

long

bar

clrassis.

chassis

Pìace

as

through a grommet

the eqnipment

touches

or receive

6C4

remove

and

the

receiver

'"r,hich

bar

on

connects

There

to

all

of

\.oLr

is loose

the N{BF

set it

is

over

the back

are

the main

the nuts.

u'ill need

rvith

on

the front panel

a

ied

r.f.

6Cl

section

the

the

receiver

also

the

rvhen

shock.

Figure

oscillolor

circuit

modif

from

on end

up.

first

should

sever-

chassis

bolts.

them

exceD-

to tiìe

dis-

-

5l

circuit for

for

MBF receiver

icotion

Remove
variable
sistors

from

all parts.

the rest

Now,
to

form
able

circuit
existing
sistor

lator

grid

(C-147

remove

break

bolts,

The

second

oscillator

is

(R-149)

stage

resistor

)

of the

circuit

c-166.

Remove
V-If3.
Remove

tuning

L-113.

rer,vind
imatelv

ends long

form,
about
wire

coupling

nects

the
is
rvhich
rvhich
t:rminal
that pin
trrrns
conversion.

tenna
tube,

Remove

capacitor

capacitor

This
it s'ith

one

the bottom

3" long.

as

shorvn

Lead

to its

varinble

:rtttrched

is

was

of

to thc

The r.f. input

coil L-111

V-108,

@

receiver

MBF

section

the receiver

capacitor

the

first

Leave

the forrn.

shorvn in figure

is returned

and run

"A"
the

bvpassed

#7

the

circuit.

oscillator

and

it rvill

6C4

for

of figure

that

and connect

of tube

capacitor

the wire

C-166.

coil has

similar

turn from

rvire

Put

in figure

is

the

stage

original

capacitor.

to

the

removed previously.

the variable

of

the socket

coil

is

Note rvhere

section

crystal holder

C-192,

oscillator
6C4

tube filaments

Leave

coil

Remove

be

easier

(V-113)

the receiver.

50. First,

you

removed

it in parallel

V-113.

to

the rotor

C-140

from

C-146

attached

Nou',
5 turns.
size rvire,

the

bottom.

them

through

about

the ncrv

51,

original

to the

place,

The

top of

ground

to

capacitor

tap.

This

circuit

is

ttrpped.

and

the

capacitors

tube

socket

the

tube

L-114,

being

the solvent

to remove

will

norv

become

The

51A. Compare

take

from

with

The

old

coupling

of

tuning

from pin

pin

#7 and clip

to

the

take

out

Remove

B turns

tapped

Leave

the

eyelets

1" long,

coil

length

mixer

at the

plate

the

tall stand-off

brrók

tube,

top

u,ith

and

in place

of coaxial

V-109. It

of

terminal

capacitor

N,fake

grounded,

is

not

grounded.

is

completes

converted

It

is near

the

coil leads

next.

the

Y-102,

the first

and re-

V-114. Save

in

series with

in

the socket.

careful not

Irom

the coil

the coil.

the tun-

new

oscillator

it

with

the t00K

the old

R-150,

capacitor
capacitor

of socket

#7

it off.

coil

and to

plate

the
the rvire,

approx-

the coil rvire

on the

the top tvire

ùd

the coil,

of

V-113

insulator,

C-146

sure

that

but re-

the

oscillator

The

r.f.

amplifier

go,

thèn re-

o

the

re-

oscil-

the

coil,

and

coil

r"-

cable

con-

or to

one

and

an-

TB

Sunpr-us

Renro

CoxvpnsroN

p_

M a o / F /

Cro2 V'oi C1o2

@

oRtG/NAL sacKET J1a1

.r".à'

^

,"

"*o"*

WIRE

^ {--_

8r42?

A-Origino
B-Modified oscillotor

Q-Qselq6sment

rncl'u'e tìre coil. Unsolderr
tl'rev
tho coil, and
bend
tlic
bottorn tc'rnrinal

tuninq capircitor

to
C-1S9.
cirpircitor',

Thc antennir
stand-off
to ther
c'oil
insuìirtr-d
encl tcl tlre c'hassis
ancl doi'r't

Thc final

nrodifv

to
on the srune

a2

iD-

RED

C

|

Ínrr8

rro

WIFE

(

RELAY coNTRoL)

Figure

I MBF tronsmitter osci

surplus

crystols

of

phone

jock

rntrst be replaced

replilce

rvith 7 turns of similar

tlic encls irround

lrole opcn

in the e1,clets. Replace

goes

to

C-l!3 and

goes

Thc top

to the other side

ancl to C-12'1A,

lcad is terminrrted near the coil trt a

insulator, The

insuìirtor non'

rvrapped

goes

uvel the top tums of

u'ire for the ucn' coil, and

ncxt to tlic coil form.

clarnaqc coil L-l11, See figure 518.

n'roclificiition in the receiver r.f. section is

mircr

L-118-1i9. Both coils

c'oil

form. Rcrnovc the form,

E

MAA/F/EO W/rH

I

nv=+REDwTRE

u--

=

-

1.5vOLr+­BAfTERY

52

circuit for use

socket J-ìOl

the connections

later. Unr'vind the 5

the ey'elets

#1

pin

of silckc't

and R-117.

cirpacitor

to ther top of ir

!_Q

_assJ!!4

BH6

6

\?/

t,

I

î_.c!8.c

PL-óA

'-\lil..----------*

aJrr\+

I lotor

with micro-

carefully, as

and solder.

tlic coil, The

\'-108, and

padding

of the tuning

(C-I68)

nerv

coil L-111. Use

gror-rnd

Use a l.rot

are

rernembering
rr.hcre the conne.ctions iÌr(.' attached. The coils
tulns each.
si;nilal
solder all

Other
Modificotions su'itch

u'ires to

Rcmove tlie u'indings.

u'ire. 6 turns c'ach. Replace tlie

size

lerads.

Receiver l-The

"Press

(5-105)

a d.p.d.t.

to

top tu'o terminals

the

u'ith thc u'ircs to the Ìrottom

toggle

should be

trvo terminals on the

ren'ind u'ith

and

to cut

should be chtrnged

srvitch, The

interchanged

ncrv su'itch to mtrkc the piinel markings read
snrc not to closs-connect the u'ires.

?-Remove

the tu'o brtrckets on the

the cover over the

receiver

tuning capacitors.

panel

u_LL

JACK

Ttol

c1

|l)c
c{lllo
<{lllo

c{11)o
clilP

rcuit

ci

with

tums on

size u'ire,

Leave

cirpacitor

atttrclted
trvo tnrn

free

the

iron.

n'ound

have

and

coil,

Squelch"

right. Be

holding

is

3-It

for the receiver.

pin

trnd R-144

#7
to the cathode
V-110

through er series resistor

resistor R-123 rvith

51C

).

The receiver

panel.

the
\lake
touch

Remember

right

sure

the chassis since

betu'een

Testing the Place

Receiver
tion.

You

strong,

hear

tt.c. buzz). Peak

nothing,

Tronsmitter

for

50 Mc.

order

to emplol'

stals,

the oscillator

in figure

old

oscillator
thc

siime filament

string

operation.
totrchr,:cl.
qrourrdeci.
shoul

in

ond hirrmonic

s'ith

26

turns

(\'-102)

Coil L-10!

Space

the turns
mtrltiplier
l--103

to 18
diamctcr,
spacing

8 turns,

to

plate

The

center-tilltperl. : l-1 r,

terr, turns

4

grid-clip

to
3 turns,

#12
one rvire
the r.f

. circuitrv,

Miscellqneous
Modificqtions

on iìn insrrlltinq
rvires
T-101. Tript' t,irch sile.
PL-68
another

l)í-volt flasliìight

e:rsy to make

meter

Remove the

socket

of

(pin

#2) of thc first i.f.

a 470

ohrn,

chnssis is nou'rentounted

to rcplace

rvay

rvith the bolt holes in

front panel

the

there is

the trvo.

a short

(use

J-103),

can

tuning

probably

capacitor until

hear

the other

check your

squelch

Modificotion

Operotion cuit

plentiful

the

circuit

52.

A 6BH6 regenerative

tube \r-I01

current

must be

(6C4).
iis tl're

Tc.nninriìs

iurcl terrninirl

Tenninrrls

fiqru'e

5lll. Plate
(12
of

norv

should

*l

:*l.

cnil L-101

\lc. )

of

:È!6

tlie cn'stal

u'ire,

e.

turle to tlie l-1-15

should be altered

grid-dip

to

(V-103)

tubc

doublt's t,,

turns, centcr-tappt.tì.

turns

spaced onc

grid-dip

the cirirrit

coil of tlrr'prr.lr

\f

c,.

u'ilr,.

ri

irL'-rli.(Ìn(

'l-l

r,, rr,

orr,,-irri

'l'lri'

r,,rrrtrlt,tcs

spaced tu'o

to 5l

e.

diarnctt,r.

Tronsmitter 1-Change

pl.itt',

fronr

tt'nnin.Lls

slet,rt, c,ontirc't

ri'ile

fror.r.r

:l

to tc'rn'rinirl

terminirl

birtten'to ground.

position

green

\1-114.

#

lead

Connect

of tK.

}í-u'att

thc

resistor

phenolic

the right

mountinq

potential

a

antenna

on the receiver

rind tunc

vou hear

TV channel

stagcs bv ear. If

srvitch.

Tlie

orisinal \lBF

uses expensive liigh

freqlrcncv

6 \Ic.

tvpe FT-243

modified

oscillator replaces

The ne*'

old for

#3,

4,

and 7

ol

socket \'-101

5. rrnd

6 irre leu.ired

tunr.s to

iLnd is reu'ound

Tlit'

nrultiplier

to 17

trrrrrs of

to ll \1c,.

5() \Ic.

=11

r',

ilc

cìirrnrcter.

trr l1 \1c,,

prrìì

l\l)l

.,r

ir, . r,ue-inch

t(,Ì\. \djust

r,.

.rnt|n[rir

iìi.irnltt:r,

lr

ntodification

to a PL-68
phone

Re'ntovc

iurcl

#2

Run

rr r"rire from

#l

#2 of T-101

"S-meter"

I a

attached to

this lead

tube

socket,

Shunt cathode

(figure

to the front

insulator

place.

screws do

not

difference

the

oscillator

a sta-

3

(a

! or

1'ou

cir--

crystals. In

cr1'-

as showtr

tube has

propel

scries

are un-

rnust

be

as

the sec-

stage

\lc. region.

=!2

e. rvire.

The

second

Rervind

u'ire,

e,

)í-inch

Adjust

is rnodified

to

diame-

spacing

coil,

L-109

turns

spaced

of

socket

J-101

micro-

jack

mounted

the trvo

of

back

transformer

the

of T-101,

and

throueh

Tape

the tuÉe

is

N{ewuer,

Volurrn

III

49

shield next
shortening out

2-Plrrce

cathode resistor

(6AQ6).

pin

to

3-Parallel

gfd.

0.0I

to the microphone

a l0

r,fd.

Positive
of the socket.

#2

audio coupling

ceramic dísc

Convert Your

Dynomotors

You

cirn convet't
a ll5-volt motor
the bmshes from
Next, move

generirtor

the

generator

the
chancc of
tions. if
field
cord across
might have
if

it is
Your converted
as

a standard motor,

fans. glinding

The

dy'ne covering

the tlvo field

end,

field rvinding. (You

guessing

the motor

connections.

fielcl

the

to drill

not long

s'lreels.

Adding o Tuning

R-28/ARC-S

R-28 ARC-5 rccciver

the

(figure

25-volt

R-l11

52C).

electrolytic

(4.7K)

terminal

capacitor

capacitor.

Surplus 24-Yolt

to Il5

lrlmost

b1' the follou'ing

the motor

and connect

the correct

docs not run,

Finallv,

)

coils and

and tirp

enough

motor

but it
ctr,.

frccluencv

Volt

any' 2E-vcllt

u'irers fron-r

connect

thc slraft

to firsten

docs not have

mav be

Control

V.H.F. Receiver

is ii

lanE{e

jack

to keep

capacitor

of tube

of the capacitor goes

C-119 rvith

A.C.

dtrnamotor

changcs: Remove

end

of the dvnamotor.

tl-re

tliem in parallel

htrvc

polarity

qeneriìtor

of the connec-

reverse

a 1l5-volt

fol irn

a cor,rpling

trs much

uscd for turning

it from

socket

Motors

,r-roior.

end to

fiftv-fifty'

ri

the

brushes.

extension

toroue

across

V-105

n-rotor

to it.

to the

ten tube snperhetcro-

of 100-156

\lc. in

u'ith

line

You

four

crystal

24

volts
plate
ceiver is

to change

oscillirtor for

a

thereby

First, remove
oscillator
cillator stage,
citor from

to

(grid)

#4

ppfd.

l0
zero
citor.
the chassis.
capacitor

p1,fd.

144 \Ic.

the
the 10
pacitor

is

er

140-150 trIc.
lator acts
original

stages increasc'
ry,rire'd for local
cìrannel Il or C for
ltntomutic tuning nnit miu'
in

the section of this book

AIìC-5

controlled

for

a.c.

potential.

given

the

be used for generiil

compii.rtment

the
of socket V-108 (f2SFI7).

tuning capiicitor in

temperature

Ground

Connect

pin

to

capacitor

band

ppfd.

tuning cirpacitor.

is full1,

as a tunable oscillator

crvstal frerluencl'.

transmitter.

channcls.

the filaments,

The complete

in figure

crvstal controlled

L44 N'Ic. reception.

the

sides

covers.

V-108. Connect

jturction

the

#8

acts as a bandspread

meslied,

this frequencv

oscilliltor injection.

of coil L-lI1

coefficient

rotor

the

of socket V-108

ci.rn be spread :rcross

the tuning rlnge

Converted in

optimum !-rrctcr

iud 250

schemirtic

54. It is
oscillator

2-meter

and top

Locirte

a 100

series rvith

cernmic variable

of

the variable

frec

terminal

\\1hen

this manner,

The succeeding

up to

rcu'orked

be

detiling u'ith

The receiver

volts

at 75 rna.

of

iì verv

in the region

simple

to a tunable

The

receiver

reception.

cover,

the

cn'stirl

ppfd.

ntic,a captr­and R-152
Install

(plate

capacitor

Set

a variable

ar 3-30

capacitor

of

the ceramic

The 3-30

).

the full

the ceramic

of the receiv-

multiplier

the legion rr'-

the receiver

rcception,

rrs clescribed

the

the

requires

the re-

matter

can

and the

os-

pin

to

ppfd,

capa-

to

so that

dial

of

ca-

oscil-

of the

to

The

T-23/

Figure

R-28/ARC-5 V.H
used for 2-meter
tocle J-l03 is ot bottom
ponel.
of
ing

Dynomotor

receiver

receiver

of

diol ot

deck.

53

F receiver moy

reception.

spoce is of reor

Approximote

is indicoted

ponel.

top

of

be

Receo-

front

of

tun-

by edge-

I

"*

,r%

*t

,.:l*;!&.,*

,,,,,,

ll
tl

st

I

I
I

I
I
I
lr

Eqi,

!

ifiFi

ISEI
I
I

|

^fl

r'

l!àd

-lo;

,

ssil

I

iawt

i

l'L

l-l

rl

ll

fl

f6

*3

ìi

Èl

9

J
^q,

1

0

îr

cq

r

?l

tr

il

ll

it
sl

II

Et

I
I
L

a

ù

?

g
I

É

liirit

I

us

r-l

I

iiEil]

l:fl 1

-

-l

|

ll

tl

i tqsr

I

I

I aSit

-

t;<

JnflO€"lag

Lsti

t__

t-

I

tt

I

l\.

.,L

I

T

!

Nrl

l=

s)

t(

H

Àl

\

tÈ

g

Jig@

?,,

6ar

lilu

J)OtE''

-cm'sc-óru

r-

ú.

.*Ú

,Àd

o\

:@

óq

i*-ú.

U
l-

:

LU

I
U

L'1

ttJ

UJ

U

LU

ú.

LO

'|?fitgat9

o0'G(Erf,

t,

6J

=

i,

(

.--

x96x't

tP

9?l

-;oootsg
rgtu

tl

tl

L__!

lllU

o-O@'O

10Il96

'

U

6{

69tU

IT

t-9

4

I

I

I

I

l
I

I

lsll

_ _ _cs

<

9t

-@Ob

u_

lflu-

_

úll

Tin!
3i'i

E

f>

Éo

rt{

.rh
tr.

I

ig

I;

r'

0

x

,nn99

trrT]'J.

t9

ZoO

sorl

Sunpr,us R,qnro

CoNvrnsroN

MeNuer,.

Voluur

III

51

OR/€ I

L

NA

v106

A-Modified
B-Modified

Rewiring
Circuit lor
Yolt

A tubes have
The follou'ing rviring
iue maoe:

l-(Refer

R143 Cr54

VloT

filomànt

erotion.

R-28/ARC-S

oudio

Filoment

the

Six all the

Operotion their

6-volt filaments

to figure

\9/

Fioure

circuit

circuit

It is

6-volt operation.

changes in

55A).

Remove

MODI F/ ED

vJo6 .ol

.r---îJG

?,-r\

-

(

) |R'."

\--./

|

I

55

for

ó volt

necessary

l2-voli tubes

6-volt equivalents

and

are not

the filament

the wire

to replace

K*

op-

rvith

The

717-

changed.

circuit

from pin

for

#2 of
#7

socket V-102

of

socket V-102.

2-Remove

connect

remove

pin

#2

this

the

and

v-t03.

3-Remove

nect

it

to

v-109.

4-Remove

pin

V-108
pin

5-Remove

it

6-Remove

it

This

completes

for 6-volt

Modificotions
Audio

the

a

potentiometer.

meter

mounted

run in

ends

2-Remove

the

#7 of V-108.

and

of V-108,

#7

the

to pin

the rvire

pin

to

operation.

Circuits

12A6 (

pfd.

0.01

to

shielded

of the leads.

R-145 (1.5K)

and

connect

Ground pín

the wire

the wire

#2 of Y-I07.

#8 of V-106.

pin

on the front panel

from pin

lead
two
pin

pin

two lK resistors

connect

wire on

the conversion

of

v-107

capacitor.

#5 of V-107.

pin

to

lK resistors

of

#7

V-103.

from pin

#2 oî V-109.

Remove

pin

it to

pin

Ground

pin

on

Ground pin

l-Remove

(0.006

il:5i1""'ì-lX:

)

Replace

Connect

wire.

Ground

from

#7

#7

#7

the

this

#2 of V-102,

#2 of socket

of

socket

connected

Ground

#7 of

V-l0g and

Ground

between

the

wire

on

of

#2

V-108.

of

Y-107

pin

#7

of

V-100

#7 of V-106.

of

the filament

R-143 (1

pfd.),

meg.),

and

:;'i

R-144

with

arm

of

the potentio-

This volume

and leads

the

shields

pin

#8

of

lead

V-103.

to

V-103

pin

and

Also

between

pin

pin

pin

pin

and

of

and

R-I44

#2

con-

#7

and

#2

#7 of

Ground

connect

V-107.

connect

circuit

C-lb4

(0.47

of

of

":iT;ll,,T

a

500K

control

to it

V-107.

is

are

at both

Re-

rop

vrEw

Tuning

oF R-28/ARc-r

system

geor.drive

right.

ot

Dynomotor

*rEP'VE*tfu,r"

is

ot left, with

crystol reloys

mount

is ot

DUSr

reor

of receiver.

covER REM.'ED

ond crystol receptocles

$

xl

t

I

f,

'*1

sr

.

1!'

s

52

Sunpr-us

Rerro CoNvnnsroN

it with ir

place

ground.

to

#8

3-Remove

C-f57,
V-I07).
voice coil

ceramic
#4

new transformer

speaker.

4-Connect

and

disc

Y-I07 socket,

oî

the

Pins

#1,
Pin #7:
Pin

#6:

Pin

#2:

Pin

#3:

Converting

Tronsmitter

RT-19/ARC-4

The
able of
fretluencies

develops
rnegac,vcle

operation

in the

approximntely

bandrvidth

470

output

limiter

Replace

output

capacitor

rear power

3, and
B-pltrs
6 volt

Auxiliary

A.v.c.

pin

#3

during

the

on anv

140-148

l-watt

ohm,

transformer

(all

R-168

T-I01

transformer.

between

The

connect

plug

4: B minus,

250 volts.

filament.

audio

lead. Open

pin

and

transmissions.

in

small 5K

rvith

Connect

secondary

your low

to

(J-102

one side of

outPut.

connection

to

#1

RT-l9/ARC'4

for 2 Meter

is a complete

four crystal

one of

N'{c. range. The

10 watts

rvithout

retuning. Crystals

resistor

T-101,

pin

from

capacitor

plate circuit

plate to

0.01
and

#3

leads

impedance

follows:

as

)

6-volt

between

disable

receiver

Receiver-

Operotion

station

v.h.f.

controlled

transmitter

output

over a

pin

of

r'fd.

pin

of the

fi\

cap-

the 5.83-6.0
complete
Dó.

Description

Tronsmitter Section

lowed by

(6V6-GT,
mately
36
final multiplier
lVIc.

plate modulated
V7-T).

talk

transmitter
coaxial

The

Section

a
plane"
to-ground"

I

and

in

18

\'Ic., and

The

A carbon

system

transmission

Receiver

common

rvill be

)

provided

frecluency

NIc.

schematic

of

three

Vl-T)

Mc. The

VS-T

r.f. amplifier

is incorporated

is designed

i.f . amplificr.

rvill

)

of the

the

harmonic

plrrte circuit

second

(1614 or 6L6

V4-T

by

microphone

line system.

The
employs
plete r.f. input

removed, and

be rervorked

a tunable

u'ith

range are employed.

ARC-4

'fl"re

transmitter

consists

oscillator

generators.

6\'6-GT

(1614

(\'5-T) is an 832-A,

class

trvo

be

to

receiver

ten
One

is shown

crystal-controlled

of a

stage

is tuned

(V2-T

doubles to 72

)

or 6L6)

-\B

6L6's

is used,

in the triinsmitter.

rvith a 50-70-ohm

used

portion of the

tubes and

circuits

input circuit

the other

2-meter reception,

for

oscillator.

in figure

the

of

(6

Mc.),

oscillator

The

to approxi-

doubles

)

NIc. The

doubles

which is

(V6-T

and a

has

two

connected

("plane-to-

one

"plane-to-

The

The

ARC-4

fol-

to

to 144

and

push-to-

The

ARC-4

com-

to

("plane-

is ot

VtEW Or

left,

UNDER-CHASS1S

717-A

tube

with

Figure 57

a-zeZARC-s

REMOVED

center.

i.f. stoge

ot

of chossis.

Power

WITH

receptocle

RECEIVER

DUST

is

COVER

reor

ot

Menuel,

ground"
pled

5-6-R) having a passband

(V7-R)
l2SQ7
stage.

(Vg-R

may be
on the rear
put

of V10-R

and 25 of the

A
sion crvstal oscillator
second
v.h.f.

Power
Control System either 12-

dynamotor (
dynarnotor.
lowing
motely
rdrich
put

circuits.

conversion,

Tronsmitter Cry'stals
Conversion used in this

6.0 \{c.
ranging from
ployed.
capacitors
Remove
#8)

capacitor.

across oscillirtor

mica

Microphone

Tronsmitter

for
marked

2200). Rcntove
the rvhitc n,irc

junctior-r
that n'as

7 on
complcte
R32-T irr
cathodc.
c'onnectecl
the tcrnrinal
R29-T
electrolvtic

Voluur III

section employs

to three stages

is

used

(V8-R)

Trvo audio

and

V10-R) are provided.

from pins

taken

of tlie

appe.us trt

same

6N7 double

(V2-R)

6N7

conversion frequency.

Supply

24 volts

Neither dvnamotor

conversion.

controlled

has

a chiinnel

The control

to 6.16 \Ic,

To make tht:se

in

the oscilìator

C2-T

on

socket \/l-T

Next, re'rlove

capacitor.

Voltoge

\\'-L),

230

of

thc tu'o resistors.

connected

thc rear chiissis plug

the c'ircrrit

st'ries u'ith

bias

rcsistor.

fronr

of R32-T

arc lx'piLsscd

filter capacitors.

of 10

as iin audio

serves as the

output strìges

22

(500

unit

panel

plug.

triode

and frequency

acts as a

ond

The ARC-4

employs

or a DY-10

,

)

The ARC-4

from

tlie C-51-/ARC-4

selector and

of the

rerluires

band

For

6.045 \lc.
cn'stals

ppfd.)

(50

ancl replicc u'ith

coíl L1-T

-'\t
thc transntitter
resistors:

and R31-T

Iì3-C

from

rvith red-vellou'

to this s'irc'.

of R26-T

R26-T,

Next,

thc filirment

(fiatrre

gruuncl

to

a 6AC7

Nlc.

of about

squelch

second detector

trnd 23

ohm

(VI-R)

box is not

surplus FT-243

conversion.

crystals in

the Novice

to 6.125

circuit

(betu'een

caltircitor

ancl rcpìace

thc

thc clrassis

Crouncl

iire

ancl

u'hich

thc leird of

circuit
60A

(V3-R

i.f.

amplification (V4-

tube, and

employing

The

of the

circuit),

jack

J1-R

serves

tandem doubler

is powered

or 24-volts

either

LRC-1

/

is recpired

is designed

audio input

Nfc.

operate properly,

must

C3-T

rcrrr

lì3-C (30

(100

trirc,t'r'

Tc,nninals

connec,ted

R3l-T.

).

u'ith

mi.xer,

)

kc.

80

rcrluired

pin

u'ith

of

crrnnectccl

thc ericl

is

and attachccl

Both tenninirls

50

A i2SQ7

a second

and

12A.6

output of Vg-R

plug

terminals

and

pins

and

as

a conver-

quadrupler.

d.c.,

a DY-9/ARC-I

(I2/

for

to be

control

and

The

two-meter

range

the

band,

should

be chanqed.

#5

a 15

irpfd.

(400 ppfd.)

a 100

the chassis

sidc

ohrrs,

ancl disconnect

of R32-T

#1g
toqethcr
This pìaces

thc urodulator

lì19-T

pfd.,

cou-

audio

tubes

the out-

#24

A

to

the

from

and

24

volt)

the fol-

re-

box

out-

for

the

type are

of
crystals
be em-

two

and pin

micar

ppfd.

on

itre tr,vo

ohms,

mirrkcd

to

thc-

ancl

to

is dis-

to
of

50

volt

Receiver
Modificotions

intercom
the
to

the termin:rl
nects
rvhite
12A6
rvith red-brown
R47-lR
on the receiver
rvire

(1500

cha"ssis.

rcru.
stirges

Reloy

Modificotions
for

capacitor
tu'o
fonnerll.
to the positive
terminirl

rrent
voit
tive
the schematic
srvitching

Filoment
Modificotions

ccptircle

Cr<rrrp

4:

28
u.'irtt
nppìie.d
po\\,er

Receiver
Modificqtions

10-32

tht'

ancl loosen
entc'ring
turring
tlrrr
c,oil L5-lì.
nurnber
ccrrimic
iiìong u'ith
tlie
brrck

Audio

circuit. Disconnect

grid

(pin

to resistor

rvire

rvith

tube

socket

and

R47-2R

from

this center

ohms

)

The

This removes

when

trirnsrnitting.

Circuit A

operation

rrrc

leads (rvhite

connected

of the

line

through
electrolvtic
terminal

and 18.

resistor

supply

machinc

top

trrning

iurxiliarv

of tlre ARC-4

of

relays.

Circuit To

plug

in

2:5,6,

from pin

to pins

schematic (

cover

tìre

tlie

top of

unit

rrnd it u'ill
unit
This

of trrrns

ciipacitors

tìre coiì.

cirpacitors

A portion
age from

the receiver

#5) of 6L6

board

tracer

located

correct

of relay

rnounted

terminal
rectifier

capacitor
the

drarving.

!{roups,

15 and

Croup

AI

scre\\'s

plate

screrv inside

ald remove

on it. -A.lso

adjncent

R28-T

green

side

fic-.r is
608 to rectifv

Remove
nel
of

coil rniu'

(

tracer

Vl0-R.

that

(10,000

of the

tap

cn

terminal

the B-plus

Sarkes-Tarzian

used in

S5-C.

neirr

rvith

blue-green

to

R3-C

of

is

a 100

rectifier

operate
po\\'er
terminals

irs follows:

16.
5:

8 trnd A1.

#18 to A2.

and

A2

tuning

the chassis

beneath

of the first

the trirnsformer.

corne

in

the

Finallr',

of

panel.

of

the audio

the microphone

audio

the

bare

tube

socket
to

the

250K

Disconnect

junction

the side

the rectifier.

attached

olim resistor.

is placed

Finally.

supply,

Group

figure

tlie

bc identified

unit. It

Novv

).

on the

connects

ohms),

chassis.

the

(30

and

(ground),

unit located

that holds

free.
thc

ren'ìoi'e

rcmovc

tlic'

grid

to

which

to the

trt

is

the

from

the receiver

If-500

the

the filament

Íhe rectifier

crvstal

tracer)

olims

to the

betrveen

ground

i"*o,re

the filaments

strap

on

the rear

Group

3: J,

Connect

Fiìament

65

).

"plane-to-pliine"

by unscreu,ing

the

ch:rssis.

i.f.

transformer

Takc

6N7

one

u'ill

the platc

tuning

signal volt-

is fed

section

rvire lead
V7-T

that runs

tube,

and con-

disconnect

(pin

,"vhite

the

junction

the

is

mounted

Now,

connect

end

of R42-R

the rear

one

nearest

silicon recti-

circuit

as shorvn

be

of fisure

and filtér

sockets.

that were

are

attached

)

The

negative

12.6-volt

A b00

the

as shorvn

the

from

the following

power

1: l

and

19. Group
a 30K,

voltage is

in

the center

the four
Remove

the

coaxial

Pull

up on

the sides

oscillator

bv the great

of the

50

needecl

unit

from

53

to

for

the

from

the

#b) of

rvire

of

of

the
the

audio

voliage

The

fila-

pfd.,

2E

posi-

in

crystal

the

re-

and 2.

1-

in

the

chan-

FLI-R

line

the

off

nlate

lrpfd.

later,

liolcling

the

a

54

Sunprus Reoro

CoNvnRSroN

TN
]fl

o
oì
o

è
É

o

-,

0)
3

É

at

g

o

I
F

o

L

Gtì
o

o

Figure

SCHEMATIC,

58

RT-

191

ARC-4

3R

[.,"

.R

R.n
ì
I

I

r2F

FIR

MehruAL,

Vor.uvrn III

,f

J

l--Pl'r
+-l

ttl

ÉfFì

I IT

IJIJ

DD

--

ar.rGf

f

(at.

Yfan

{crÉi3

f.ra

^grlv

tlrttt

,ro.l--E--r,*c'rcoi'rroffi---]

-i4t_---<
r !

, - 1 ì-[-

oro

c5,

talrcror

|
:
t

ScHEMAT|C,

Figure

58

RT- t9

/ARC-4

Figure

59
PANEL LAYOUT
OF CONVERTED

ARC-4,

PLACEMENT

MAJOR
O-l d.c.
ter
switch ore ot

SHOWING

OF

CONTROLS

milliomme-

ond selector

left

of

tu n ing d io l. Type

-243

FT
mounts in holder
necth

lo mp,
ond i.f.

obove diol.

ore

crystol

be-

dicl

Pilot
o, c. switch
goin

control

Coil L5-Iì

6li" beìrincì the'

aborrt
shosrr

in {iqrrre
groundccl,
ed across the

is

irncl rr

ri'irrding.
cerirmic cirpacitor
nrrl on tìre ncrrrbv

62. This coil converts the

nrountccl on tlie AlìC-4

nnu'

front

Tìrc botton-r encl of the

til.

t0

ccrirrnic capircitor is cclnnect-

1,pfd.

Conncct

goos

rr'hicli

phcnolic

oscillirtor from cn'stirl

to ir tuned-plrrte ttrned-glid

@

A-Microphone circuit

moy be
rcise modulotion
is employed.

the

f

ier system
ront

B-Rectif

C-Revised

chassis.

panerl,

positione'cl

and

u'inclinq

the coil to .r 50

to tlic bottom

irs shou'n in figure

strip

circrrit

25i>-^u\^---ì|l

-\r

(ficrrre

la! co L

bJ

+l

I

--l-lìÙ\

|

I

I

end

60

-:r'

5

à)

ARC-4. The

of

removed

ond

ottoched

level if o low output corbon

for reloy control.

receiver oscillotor

ponel,

os shown

.\

ni,rrr

as

irnd ii srniill ct'rirnric'

is

c'lrassis

gpfd.

tenr-ri-

cxrntrol

C).

-.
',,Ra,)-aF

,,a:r _.

Figure

::e!Ì;..

pin

to

plrt'nolic'

tlre

Aborrt

slrould bc cut rìncl

tlre -LRC--1. Position

ó0

microphcne

to cothode

circuit.

The l0

in f igures ó3 ond

clt,.rrunr't'

tlrt'

holc. Tlic tt:tlritrrtl o1' t1,,'

:6

spfd.

lrolt' is nori clrilltcl

st'c'onrl

lrottorn

(platc)

strip.

this stage

morurt,'rl ir,

fet'd-thlLr

of tlrr'

power

=8

pin

of

microphone

copocitor

tt'r'n'rin.tl

ot tlr,'

of

tlr,'rrr.rin r,,ntlols crrn be seen

ieod to

sccket Vó-T to

(T-ì7

is tuned from

59.

tlrlr,u{lt tlrc cltassis

of

irrsrrl.ttol is

nr.r rl.rtor is

',,rkr

6\l

,J.rnr(.

.r rrtri'

1r,,'itrorr

R32-T

type)

plrt'trolic

tlrt'

placed

t \-I-R. behincl

olt tlre front of

in the

contte'ctccl

panei plirte

strip,

g+

Sunprus

"NA/S€"
Pi-R

250 K

R2a R:

R luo

CoNvnnsroN

NleNuer,,

V5- r

e3aa

EI

''--l-

-t_

-i'

-l_

Vorulrr

t'

I

I

8+

III

raov

>--.ll--

2ND

D ETECTOR

2ND

AR/G/NAL

''Ca6

MAD/FI€O

DI

C/RCU/T

1246

C/RCU/T

TC

îo

AU DIO

ST46ES

12A6
AUDIO
STAC E

NEW CRTSTAL

sock€r
AN PANEL

5

R

COAX AL

rF

McuNTEo =

LEAD

Rl-r

v1-î

6V6GÎ

@

A-1.f.

B-Smoll

goin

neon

control

is mounted

permits

shell
C-Modified
D-Cocxiol

volume

leod

UNDER-CHASSIS

AMPLIFIER

Cooxiol

leod

to

{B

"noiseT')

inexpensive

grommet

light

circuit

tube

in

bulb to

(lobeled

mokes

rubber

control

for tronsmitter

VIEW

(RIGHT)

ponel
power

AND

crystol holder posses

supply for

a\

,.:/

Fioure

62

for ARC-4

modulotion
pcnel.

in

(see

dofted line).

for ARC-4

crystol

Fiqure

socket

I

ó

-ARC-4

OF

MODIFIED

chonge-over

indicotor.

Copocitonce

(see

f igure

SHOWING

RECEIVER

olong

reloy

center
is

ot left.

Neon

ground

to

ól).

CASCODE

R.F

OSCILLATOR

of chossis.

@

lomp

of

Silicon

a4.!.'=;-

*"lgilGF,|

*

^éffi::fì

{#

w

'*

fl*'*#.o.

b,"

{F

*F

*%$i*t*,

58

Sunpr.us

Renro

CouvnnsroN

6B07A

.ool

NOÎE:
NEMOV€

CAPACITORS

ANo

C1i-P
COUPLIN6 NETgORK

C1z-R

tN

r '

w

ts=

'oFlHr'

.ool

I

(F/6.65)

v,

îo 6.3

6aQ7A

Figure 64

OF

CIRCUIT

CASCODE

FOR

L-l

Grid-dip
Mc. bond.
óBQ7-A
the
turns

in figure 59.
opening
trnit, and
panel. The shaft of tlie
edge of the
of the
type"
altrmintrm
prrnel
medirrtelv

coils

Shield is

socket to

(see

coils

of

left by the

a Nation:rl type

panel. The dial drives a small l0

vruitrble air capacitor that

bracket

(figure

adiacent to the ceramic feed-thru insulator

figure ól).

hookup wire.

A soft aluminum

removal

panel,

63

placed

).

and about

The

L9.1-R C46-R

6T-.lF*

f,geE #,.-^

l_f-1

?=:

Lr-Ls = sl

L2-L4= l2 îURNS *22 E.

ARC-4

L-2 to

ond

ploced

reduce

plate
of the auxiliary

ìvICN dial is mounted on the

dial is

abort 41i" behind the front

capacitor, therefore, is im-

TURNs r

SLUG IUNED FORMI

;f,"

$'orr., f'rorq

R.F.

center

zo E, oN

j"

ora.,

rore

AMPLIFIER

of 144

ocross center

coupling

Link

about

41A" from the left edge

is

between

coils ore

placed

is

4" from the top

mounted on an

over the

ppfd.

of

two

tuning

"APC-

-4339

a4ù

llr

ì15v

tu

POWER
Tronsformer is
255 mo.,

12.ó

C.C.S.,

center-top ot 5.3 omperes.

volts,

5U4-GB

Figure

SUPPLY

roted

ó5

FOR ARC-4

ot 325-0-325 volts ot

5 volts ot 3

'lf-+PlN

PrN*a1

PrN *Az

omperes, ond

lomp bolonces current droin of óBQ-74 cos-

tube.

code

rnounted

on the chassis

by the dial through

The

rotor

of the

cnpacitor
is attrrched to the
The modified

Ponel

59.

Controls

Across the top are

oscilltrtor circuit

meter used as a

(250K,

antenna

figure 62A), the a.c.

see

lotrding

capacitor, CfO-T. Belorv this, at

deck. The capacitor

phenolic rod and a

a

grounded,

is

terminal of the

shaft

and

feed-tluu insulator.

is shown in fieure 60C.

Vrrrious other controls are

panel,

(left

front

to

riglit)

on the

tuning meter, an

a 0-l

po\\/er

as seen

d.c. millia-

gain

i.f.

srvitch, and

* !s

(l?v,)

(cND)

Pilot

is driven

coupler.

the stator

placed

in figure

control

the
the

&e-

Fioure

TOP VIE:W

SHOWING

ó3

ARC-4

OF

TUNING

CAPACITOR

The

opening left
movol
unit is
inum

of ouxiliory
covered

plote.
tuning copocitor
mounted to
the

olote.

to

osc

ceromic

ing.
reor

slug

ond connected

i I lotor c

feed-thru bush-

Oscillotor

of copocitor,
projecting

by re­tuning

with olum-

"APC-type"

ircu it

otop

vio

brocket

coil is ot

with

through

is

chossis.

MaNuar-.

left

is
trol,
transrnitter
Receiver
socket,

jack

The
ed. Remove
socket V59-R
second
located
nect
arm of
nect

control
wire

Remove

A

to

connect
shown
chassis

A

Coscode Amplifier

for the
the

line
cascode
tion

that rvill greatly
placernent
small
6BQ7-A
and

the

coil L-3 passes

Vor,urras

tlie meter

and modulation

amplifier

adjustment

transmit

are placed

500K volume

the wire

to resistor
resistor
near

the

a wire

a rvire

from

the volume

from

to resistor

was previously

resistor

short length

the

in

figure

at both

Receiver

of siglit
amplifier

of

the amplifier

copper

socket,
center

III

selector

tuning

switch,

at

the

bottom panel

control

from

the end

four relays

grid

the

control

the

remaining

R40-R

removed (use

R40-R

by clipping

of RG-59/U

crystal

ends

shield

62D.

of

are

to be

may

enhance

plrrte

and

is

stud

of

through

socket

The

srvitch, receiver

indicator (figure

control is

controls,

and phones

has

connecting

R40-R

of

beneath

of

tube

(use

terminal

at

the

to the

shield

the conductor.

The

sensitiviw

receiver

desired

worked.

be

built

the

can

be

is

grounded

the socket.

rr

ll-inch

at the far

transmitter

and micropúone

edge.

one terminal ground-

the

(

100K

the

terminal

the

VS9-R

shielded rvire).

terminal

shielded

the leads.

coaxial

oscillator

is grounded

leavés

if

stations

A simple

into

the rèceiver

performance.

seen in

mounted

pins

to

The

hole

tuning
O9B

grid

of

which

)

chassis.

to the

of the

where

cable

tubd,

of the

much

beyond

6Be7-A

figure

àcross

#4 and

neutralizing

drilled

con-

The

).

right.

crystal

IZAO

is

the

board

Con-

center

Con-

volume

the

wire

is

used

as

to the

ARC-4

to

be

sec-

The

61. A
the

in

thé

).

g

shield.
of
in

The

in
figure
and
matic,

the
previously
ohm,
phrs

voltage

Alignment

ARC-4

justed

dip
adjusted
range
mately
cuits
6].
the-correct
so

on
rneter
left
mum
tuning

Coils

the

shield plate.

figure

Power

figure

65.

the

All

rear- po-wer

20-watt

terminals

to

to res

oscillator).

8.5 NIc.

8.65

for

The

do

not

the receiver,

signals.

corner

signal

range

L-I

64.

Supply

66.

The

To

balance

pilot

lrrmp

other

connector

described.

resistor

of relay

300.

of the

onate

The

so

the

receiver

to

8.8 NIc.

N,Ic.

and tune
maximum
slugs

in

adjustment

alter

the

you

Adjust

of

the panel

strength.

of

about

and L-2

wiring

filaments

.h""::i:tl,?i"%'#"i:.(

meter

these

setting

irre mounted

The

cascode

The power
the rear

of

the filament

2.e rvired
ar.e

terminals

It is

necessary

in

series
S5-C

The

first

ceiver

oscillaìor.

plate

coil

tuning

Set

the

the harmonic

reading

circuits

when

too

should

the

three

from

)

One

adjustment

one

megacycle.

schematic

supply

chassis

the supply

drain,

as

shorvn

rvired

are

to insert

rvith

the receiaer

to hold

step is

slug

you
much!
norv

left

to

(Lt-R)

óapacitoi

oscillator

as

sho-wn

are

set

receive

lVith

start

r.f.

trimmers

to right

rvill

on

either

is placed

area,

as shown

is

shown

the

in

the

correctly

strapped

the receiver

align

The

s-Íue

H;l

shoulà
tunes

to

generator

in

very

tÉe

an

to hear

for

hold

Finally

side

is

shown

6Be7-A

ùhe-

when

a 780_

B-

the

re_

of the

I

H5:

be

the

approxi_

cir_

figure

closé

to

ARC-4,

antenna

two_

(lower

maxi_

over

adjust

59

in
in

as

a

Fioure

POWER-

SUPPLY

INSTALLED

DYNAMOTOR

OF

ARC-4

Tronsformer

with

filter

right

pfd.,

450
odded
to

reduce
oluminum
over reor
socket

of shock

copocitor

of tube.'

volt

to

output

hum.

box

of rectifier

prevent

to

from

ó6

IS

IN

AREA

is

ot

left,

Extro

cooocitor

of supply

Smoll

ploced

is

tube

donger

terminols.

to

20

is

60

Sunpr.us

Rarro

CoNvnnsroN

METER POSIIION

osc.

GR/o
UULT. GR/D

2ND

RO MULT, 6R/O

v.c L4-R

METER POSIÎION

osc.

eRtD

IST BULT.6R/D

MULT,6R/D L3-f

2NO

3RD MULf, GR/D

R,F. AMP. GRID

P.F, AHP. GRIO

AUP. PLATE

R.F.

METER CHART

the slugs
reception.

the multiplier
current, as

by
tune
r-rntil maximum
ing ir

of cascode

The crystal

indicated

increasing the

tlie r.f. amplifier

pìirte

crrrrent

'I'UN

ADJUSfMENI

FOR NAX.

TUNTNG

AOJUSTMENT

-

L2-T

-

L4

READING

ING CHART

R€AOING

)

cHARî

REAOING

)

)

METER

0.2-0.6

o,1 - o.t

o.oa- o
U€ASUR€ WITH VTVU

oN a.v.c.

METER

o.3 - 0.5

o.25
o.5

RECEIVER

ÎUNING

ITUNE

L'-R

tRANSMtîîER

TUNINC

(

TUNE FOR UAX,

L1-î

L6 o.2 5

LA

L9-r

IM/N.

Figure 67

FOR TUNING RT-I9/ARC-4

L-l and

coils

is norv

circuits

plugged in the transmitter

are tuned

in

figure 67.

loading capacitor

for minimum dip. Repeat

stage

loadine is obtained uùile still

tlip.

L-2 for best signal

for mtrximum

Load the antenna
(C10-T)

REAOINC

READTNG

and

(O-1

MA

auss

(o-i

Ml

and

meter

then

observ-

Modern,

TVI-Proof

SCR-522

Many conversions
transmitter
hansmitter.

portion of

The
is recommended
nates the t.v.i. difficulties

equipment. The

this
in figure 68.

First of all,
and strip
tuning slides,

remove the triinsnritter

off unnecessary

etc.
rear of the chassis
power
for the

as shown

cable

filament leads, as sho*'n.
SO-239 coaxial connector
shown

in figure 69C, and

connector to the

If

a carbon

"pen-lite"

install

four
mary rvinding of
still, a
transmitter
fier shor.vn

crystal microphone

if the simple transistorized

in

fisure 70

It is recommendìd over

is less danger of erudio

there
rcctifies the

potential

tive
microphonc

filament voltage to

suitable

trtrnsformer and
transistor arnplifier
control #1t5.

have

the

conversion

for trvo and six meters, as

unconverted trtrnsmitter

Nfove

as shorvn

in figure 698, using

antenna

microphone

batteries in series

the microphone transformer.

is installed

vaclrum tube amplifiers

for the transistor.

to the

Conversion of

Tronsmitter

been shown

SCR-522 v.h.f. receiver-

described in this section

normally encountered

componcnts, such

pou'er

the

in figurer

near
run a coitxiitl
link

of

is used,

can be emploved

feedback. A IN34

connect the output of the

"l-rot"

for

the

is shown

from the cabinet

connector

Nlake

69A.

#14

Next, mount

the tripler

stage, as

lead from the

the trar.rsmitter.

it

is necessary

s'ith

u'ith the

speech ampli

in

the transmitter,

deliver

a small

Remove the

terminal

of volume

the

BC-624

it

elimi-

with

as the

to the

up a
wire

pri-

the

Better

since
diode
nega-

a

to

Figure óB

THE

UNMODIFIED

BC-624

TRANSMITTER

SECTION

OF

THE SCR-522

V.H.F.

TRANSMITTER-

RECEIVER

.'

'{t

\'

&,.i

1q

t

w

:

c-1f

f"l;:

t

1.

$"".n

,

*iì!

*9

î.;ia

t-a--;

-

-

_

@,x

.P

,F

i

,E

n}i

*-.s

Mexual,

Voluur

III

61

BIAS MOUNT /N

L/

NE V/TH

CONNECIOR

B+ '2A6tS

DEfAIL - TOP VIEW

@

{-pe1rys1
B-Connecting

C-New cooxiol ontenno receptocle

T.V.l.-Proofing

Tronsmitter
pass

disc

leads

all

ceramic
meter lead rvith
citors. Use
section
a

of a tin carn

pl.renolic-cased

the transmitter panel,

pass

to

through

To

shield the
mounted in
Small, }i-inch lioles

ventilation.

relay

a

rack panel

the

on the

capacitors. In

1.5 K\/,

a meter rvith

meter

holes

transmitter

the metal

should

The completed

is

AENO TA8 OY€R

./80Lr ro

StDE

\"t

USE

5

f,l\

\ 9,/

@
@

plug

modìficotion

shown in f igure 75.

coble between

chossis neor

Install
capacitor

pins

of each tube

pou'er

0.001
a metal

to cover the rear

is used.

permitting

in

cut

the

case from

be drilled

shou'n in

832-A tripler stoge.

a 0.001

prfd.

across the filament

connector with

addition,

pfd.

disc ceramic

case, or else

Ground

the meter

rear

disc

completely,

a BC-375

in the

transmitter,

figure

AND

Figure

,for

tronsmitter

disc

ceramic

socket. By-

pfd.

0.001

bypass

each
capa­cut a

of the meter if

the

can to

terminals

of the

can.

it may

tuning

case

mounted

be

unit.

to aid

on

71.

CABLE DETAIL- XMÎR TO

/a\

69

522 tronsmitter,

power

ond

is mounted

high r.f.

the

proved

resistance.

braid

when

leads

12V6-GT's.

A

crystal-v.f.o.

corporated

,

f.

rn rrgure

To

/1.

operate
follorving
tripler
consisting
and

the
turrrs

the plate

(first

of

abotrt Ilí"

center

of

#14 insulated

coil.

for

use with

supply.

in

corner

Transmitter

replaced.

are

the 1246

No rviring

selector

in

the transmitter

the

522

coil

changes

832-A)

plate

14 turns

long.

of

the coil.

The

HOUNT
W/RE

ANTENNA

o.c. supply

of tronsmitter

output increases

tr'Iodulation

audio tubes

changes

are necessary.

srvitch

oscillator

transmitter

are

necessary:

coil rvith

of

#\4

The

The

enamel

B-plus

antenna

wire rvound

tripler

stage

50-239

0N t 3/A. PtLLARS.

WlTH COAX,UP TO

CONNECIOR OEIAI L

ANTENNA

€,

is

also im-

are replaced

that

may be in-

circuit

on six meters,

a new inductance

u,ire,

lead

coil

over the

norv

is shown

Replace

Íé" diameter,

is

attached

consists

center

acts

as a

when

with

the
the

to

of 5

of

six-

Circuit Modificotions
the

832-4

tubes to
and replnced
during

CRYSTAL
MIKE
CON N

ECTOR

roo

operation

!F

u'ith

tlie tank

copper

of the

Fiqure

SIMPLE TRANSIST'OR

PERMITS
Smoll

volume

USE

WITH

SCR-522 TRANSMITTER

omplifier

control

the

inside

OF

CRYSTAL

moy

ond the

The

brriid

nect

circuits

strap.

the

The

plate

should

transmitter

2Nlo5

70

SPEECH

MICROPHONE

be mounted

microphone

the

of

chossis.

straps

that

con-

terminals

be removed

braid gers

because

-

-

oor

L5C

D

4LL RES/STORS

z.zK

VOL.

warm

of the

Îo
6557
GRID

CONTROL

0.5

AMPLIFIER

between

jock

on

of

MODIFIED

MOUNTED

from

Cose
chossis to
ditionol

I

of the

conversion

"Surplus

Figure

52i TRANSMITTER

ON

BC-375

complete

RELAY

tuníng

onti-T.V.l.

informotion

Rodio

7l

RACK

unit

PANEL

is

slipped

shieLdinq.

qiven

is

Conversio-n

Monuol."

IS

in

over

Ad-

Vol.

62

Sunpr,us

Renro

CoxvERSroN

CRYSÎAL

SELECÎOR

I TCH

SW

0

0l-.;

MOUNT

TH|S
IN POSITION
OCCUPIED

CIRCUITRY

FORMERLY

8Y CRYSTALS.

:

Figure

MODI FI

ED TRANSMITTER
CIRCUIT
VF-I

PERMITS

V.F.O.

(RETUNED

WITH 522

meter
tube

series for

amplifier, eìnd

is

removed.

mrlltiplier stages

See Volume I

tion.

rìdditionrìl

GRN

GRN-BRN

ARN

RED-YEL

v

H'S*1'frr'l$ild?+iiJ Fo

sc

the 832-A tu'o-meter

Six NIc.

citn be

of the

circuit modification information.

MA.

5O
SETENIUM

RECÎI FI ER

* t^

r00

lL
w

o.5

Tr
Tz - srA
CHr - srANCoR c-

Figu

Tronsformer T- I de Iivers
255 ffio.,

12.6

delivers

C.C.S.,5

ot 5.3 omperes.

volts

125

volts

is

CH-l

ot

henries

4

6G6 osc.

lz.E-z

NOTE: A HEATH
CAN 8E MODIFIED

:

USE

AS A V.F,O.

VF-I

70

CAN

8 MC, FOR

8E

72

OSCILLATOR

TO

HEATH
8 MC.)

USE OF

TRANSMITTER

amplifier

crystals

retuned

are used, and

for six-meter

opera-

Strrplus Conversion Nlanual

EA.

_r

20DF

450 V

I

SOCK

8-PIN

Tueueuot)

EA.

t._I

?ou
50v

-

srANcoR P-aJ39

volts

50

PA-a42 |

NcoR

t7o3

re

7

5

-325

325-0

of 3 omperes,

Tronsformer

milliomperes.

250

ot

R

volts ot

ond

T-2

Choke

mo.

î=

!

II

i

tx
qa

ìa
\a

t

\\

\

I
3t

òh
òq

Ès

a\

s

t

all

ln

I

a

ì:i

H

I

l- J

i:i

r

-.

'!'r

1!i

I

i

rr

t

s'-

=

ú,

cì-aot

6.2ot

ffr.

Ht,

rl

t-aet

ztet ,-ttl

ET

R

]-lr,

ì

o

IH

nI

J

h

lr

if-

[t.

I

ra

a

a
I

tcl

:

e
lo

8*

1-{r'

l-tl-''

(9

s

o

U
F

:

LU

T
U

(/',

#,-

Ft\

Fo)

=5

ù.9

ZtJ-

ú.
F

N
N
LO

ù
U

v)
J

z

o

-d.

o

TO SU
M IKE

tr

8/32 NUT ANO

RACK

AND 522 CHASS IS

LAYOUT

A = at32

scREw

=

C

HoLE

3lE"

WASHERS

BETWEEN

Figure 76

OF

PANEL

FOR

TRANSMITTER

SCR-522

I

I

I

t-c'

f/ÌooH

ao/q

doJdrnooàl

,^.____^-

)so

dHe

{Ffr.

eo/

,-

dtav turr

{Ht.

-ZOt

O/

dtJy

rtf*î

-frdo

os?

-(,
HozhOJ

.ltt'Vult'(U

2/x

241 22r,1zoJ

4ì

/O7/dt

o{

-

-

I

H2

,jJ

16
'''

MeNuer.,

Vor-unan

III

63

Figure

POWER

FOR

74

SUPPLY

SCR-522
TRANSMITTER
IS

ASSEMBLED

ON AUXILIARY

CHASSES

See figure

75

for

schemotic

The

BC-312

The BC-312
out modification,
ers. Hou'ever,

proved
certain modifications

ceiver. Any

may
to
The various
any one or :rll
tion of

I

Power

for the BC-3I2

u'ith
has
supply
substantially identical.
this and subsequent discussions

receiver
instruction
instruction
or \\'ere
rvere sold.

hinges,
9-terminal connection strilt removed.
snch as

for

be made, each

performance

the

the ou'ner of tlie recciver.
Supply If

integrtrl

an

a l2-volt dvnamotor

of the BC-3.12.

has a copy

generallv

The

Dvnnmotor must

and then the lerids from
shou'n

ond BC-342

and BC-342

accept:rble

their perfolmance

amateur

one

changes u ill

the chanqes mtry

books on

books u'ere

comrnunicrìtion

in vtrrious portions

of

the chirnges

change

.rncl flexibilitv

the receiver
po\\'el
.stnrc.tecl.

1l5-r'olt

it u'ill

of T\l If-850

this series of rcceiver

rrvailable

in Figure

Series Receivers

series receivers

communications

can

be

rvork

or

iill the

adding

be treated

suppl,v must

Tlie

po\\'er

pl:rce

in

Othenvise

fumished

:rt

first

77 trnrJ diagrammed

rr certain

of the receivers.

sepirrirtelv

be m:rde

supply but

be

irssumed

that

tlie time

be swrìng

the dvnamotor

at

is :r BC-312,

first

BC-342 is

of

the iì.c. power

the receivers

the

owner

or

one of

u.ith

the ieceivers

the receivers

porver

A

are,

with-

receiv-

greatly

bv making

of

the discre-

the BC-312

throughout

since

out

im-

the re-

cl.ranges

amount

so that

be

con-

ecluipped

are

oJ the

the other

these

on

its

to

the

supply

in Figure

79 must
plo1,s
is
ply
transfonners

obtained,
750-volt
filarnent
volt
be
filtrment
are
sary for

a

former
ver1,
be plrrced

lvith
former

the trvo

in

the dial-lamp
to
nected

lamps
isfactorw,
voltiìge,
bv removíng
rervirinq

then

a

Signnl

the

same

one

for

the BC-342.

have

anv

center-t:rpped

rvinding

filament

strtisferctory,

rvindings (such

connected

heater

has

only,

small

6.3-volt

in

the

the

6.3-volt s'indinq

to

obttrin the 12.6

6.3-volt

po\\/er

tlie

One

con-rplicirtion

ground,

so that if

to either

u'ill

onlv

since the lamps give

or the

tlie bezeì

them.

be constructed.

Corps

C-228 po\\'er

rìs rvars

po\\,er

windings

If the

in

operation

porver

filament rvindings

supplv.

circuit

of

receive

trvo lamps mnv

used in

A

lirrge

been

available,

transformer

high-voltrrge

for

tlie 5Y3-GT,

at 1.75

trilnsformer

as the UTC

series

to obtain

of the receiver.

one 6.3-volt

2-ampcre

supplv

on

volts.

is introduced

uses

tu-o

the lead

hot

the

half

thrrt

6.3-volt

covcrs tlie

The

one illustrated
transformer,

the

RA-20

number

amperes

rvinding

filament

and

thc main

The

6.3-volt lamps

to the

voltage.

adecluate

be connected

of these power
but if
having

winding,

and

one or

has

tvpe R-ì2)

the

12.6 volts

tiansformer

connected

junctìon

should

bv

dial ltrmps

filament

This may

tu'o lamps

rvhich

power

one crnnot

a

650-volt

a

S-volt

trvo

gr.enter

or

tivo

6.3-volt
neces-

If

tlie trrrns-

nn

additional

in

pou.er

be

the fnct

liglit

series
trans-

betu,een

grounded

in

series

is

leads

be

at

in parallel

em-

sup-

be

to

6.3-

rvill

thel'

must

that

con-

the
sat­this

and

64

i

le

Sunpr,us Reoro

FRONT
VERTED BC-3I2

WITH THE POWER

The cooxiol i.l. eneryy output
ting con be seen on the

position

fhe

power

tàè

mounted

vefticol

row ol

limìter

on-oll svitch.
is

srtpply

motely lrcm the

trclled hy the

CoNvrnsrox

FiEute 77.

VIEW

OF THE CON-

ALONGSIDE.

lormerly occupied by

connector.

ot

the bottom ol the

jocks

notmally mounted

.eceiYer

OFF-MVC-AVC

RECEIVER

SUPPLY

rit-

panel

Ihe

swiúch

is

the noise-

power

fhe

rc-

and con-

switcrr.

in

The balnnce
tionnl. The
used

VR tube shorvn

unless desired, but its

of the

power

s,rpply
in
use dóes

is quite conven-

Fisirre 79

afford

need not be

improved

oscillator stnbility.
Yoltoge

H.F.

operirting on tl're 14-\'lc. bnnd
in

the tonc of ir c.rv. signal
or
hold refrigerator turning on or off or
ilar cause. This condition
regulation on tl're

Regulotion for

Oscillqtor

u'hen the line voltaqe

plnte

The high-freqtrency
lirtor
is qrrite

*'hen

viiries

there

iis ir

in

used

stable, but rvhen
is

some variation

r.f. gain is

thc

result

from

is

cured

by

using voltage

the

oscil-

receiver

varied,

a house-

of

some sim-

supply voltage to the high­frequenclt oscillator. The incorportrtion of voltage reg­ulation on the oscillator
brought out of tl.re
plate-voltaqe feed

oscillator compiìrtment for

tube. This operation requires

to tlie

requires

thtrt a

lead

be

separate

removirl of thc cover from the oscillntor compartment,
and the
sistor
The
moving the

removirl of 30,000-ohrn

is replrrced lry a 1000-ohm )l-rvntt carbon resistor.

r'.f.

stiige

leads

chiissis

is

thc' tube ciips, and the

to
voltnge terminal corning
p:rrtment

is bv-passed

micrr capircitol

rvith

rvhich can be
chassis belorv the terminirl
voltiigc to the oscillator
chtrssis ancl

dou,n

is

throush

leads feeding the r.f. chassis

goes,

then

Iead

R.F.

Chonges Thc

of course. to the

r.f.

svstem in the st:rndard re-

ceiver is slightlv lacking
signal-to-noise
Tliis condition ciìn

leacl from the receivcr, turning the receiver rvido

tennrr
open on \{VC, and

ratio

on the

be checked tr1' removing

rotating

then

resistor

Ra1. This re-

then lifted btrck, after

plate-

or,rt

of the

tr 0.002-irfd.

placed flitt

strip. The lead for

oscillator com-

posterge-stamp

against the

plate

then brought under the

the hole rvhere the other

pass.

plate of

plate-voltage

This

the

in

VR-105.

gnin

highest frequency range.

the

the trirnmer APC on

re-

r.f.

and

an-

the first r.f. stage through

increase in noise level will be noticed

slight
trimmer

passes

through resonance.

resonance. Only

rvhen

The most satisfactory rvay of correcting this condi-

(and

tion

number

a
first r.f.

stage

cciver is laid

in

tube
leads

than

procedule

method was

this

of other

expedients ) is

rvith a 6SH7.

in sucìr ti miulner that a single-ended

out

first r.f. stage

the

the doublc-c-nclcd tube originally used. Tho

foìlou's:

is irs

Remol'c thc trrbes

chassis as firr irs

the
pins

3, 4, 5, 6. irnd 8 of the tube socket for the first r.f.

possible.

stase. Rclr.rovc tlie old cathode-bias
Run a 100-ohm l-u'att resistor from
terminal bloc'k

pin

to

5 rr

cirpacitor block

0.002-pfd.

for

the \{VC

lcacl from the cathode b1'-pass section

for

the st:rge.

postage-stamp
br'-pass from termintrl 3 to
scrccn-volti,rge lead tl.rat

until it fits more

plate

the

lead for the tube.

netrtly

irnd rnn it uncler nll thc
the socket and

lead rvhich u'ent to the

the

rvire abor"rt 1)í

a
main chassis,

go

can

and stilì
rvith a soldering
terminal 4. Thcn
gentl1,,

at

lead to the tube

bencls out

and

conncct tliis

inches

push

tlic sub-chrrssis dorvn as far

reuch terurir.ral

iron.

pusìr

thr: srinrc tir.ne

(

ternrinal

tou'rrrcl the

It ri'ill nos' ìre neccssruv to

of thc receiver slightly

from

proven

It

gives

the

best after trying

replace the

to

so happens that the re-

much mole direct

r.f.

chassis and

Remove the leads from

resistor

the small

lead

pin

to

Install

5, and also run

an additional

mica capircitor as a cathode-

terminrrl 1.

u,ent to terminal

sokler to pin

ancl

u'hic'li dicl

Separate the

4, shorten

6. Norv run

go

to terminal 3

l'ire's neirr tl're heater

ìc'rrcl

to terminal 8. Remove

qricl

lonq

ancl

cap of the

to this

-l

on the tube socket

solder

6K7, sclder

terminal on the

this new lead

the chassis back into

miiking
'1

)

gringed

(nof

sure that the

keeps

free

tuning

re-align

h.f.

the

of the chassis

capacitor.

r.f,

tlie

oscillator how-

a very

this

6K7

invert

RS-164.

micarta

of the

it

end of

as it

to

place

grid

stages

Marruer.. Voluun III

Figure 78.

UNDERCHASSIS

RECEIVER AND

The bent-aluminum
the 746 noìse

seea óehind the

locle. fhe odded

to the lrcnt

VIEW

SUPPLY.

chossis holding

limìter tube

power-cable

chossis is

panet.

OF THE

POWER

mounted

can be

recep-

65

ever). Peak

second r.f.
will be
increase in noise when

up the 6L7 mixer stage first, then

greater

first

the

first r.f.

than before,

r.f. stase

stage, and then the

found

to be much

stage. The

is
through resonance will be found to te
nounced, If a tendency torvard instability is

near

tered
stage

maximum

padders

slightly until the instability disappears.

All these receivers

in

lash

the vernier tunine control.
the amount of
small amount by
with a small amount of

matchstick to applv the

a
lash, which

motion

axial

in

the

of

stantially eliminated

bearing at the oscillator end of the

thrust
This bearing is

l.F. Amplifier The i.f. amplifier

Chonges
The reduction

srvitched
folloiving
tal-filter
a stop

into

operation

procedure:

transformer. Scrape the

for

rotation of the cr1'stal-phasing

the

and solder a very small

srvitch contact on the other side of the

small
capacitor. Then turn the
moving contact
the cover
comes out of
for
the

of the transformer and align

the toTt of the

maximum noise

receiver. This

gain

have

N{VC, re-trim

on

a certain

In

amount of

several receivers

backlash has been reduced

carefullv lubricating

vaseline,

using a toothpick

lubrica.nt.

receivers mentioned

the tuning-crìp:ìcitor

bv

careful adjustment

all the

Then the

was

garìg,

tuning

inside

the oscillator compartment.

operates quite
isfactorilr'. but
tal filter

set

gain

in

can be

leaves

u'hen

greatlv

the action

much to be desired.

the cryrstal filter

reduced

Remove the cover from

rvhich

stud

wire

to this stud and

phasing

rests firmly against the

control

stud. Re-install

the slug rvhich

crystal-filter

with

the antenna removed

position

of the control ( 180"

caused

can

of the

of the crys-

tranìformer

the

gain

and the

trimmed

'u"ry

pro-

encoun-

the mixer

back-

to

a verv

gears

back-

be sub-

ball

gang.

sat-

by the

the crys-

serves

capacitor

to the

phasing

rrntil

the

from
from

old position)

the

or

by

tion, and

is

switched into

the receiver
for

amic adapter,
external unit
change
up wire
side the last
coil
ductor
brought into
black wire
the
cent
removed.
which the

the reduction in

A further

change in

shorvn

the operation

a narrow-band

such as a single-sideband

consisted in

around

transformer,

ground

to

of a

and the other

piece

the transformer

going

capacitor to :r soldering lug

to the

terminal

It

mny be necessuy

black
to be able to insert
ductor
the coaxial
The coupling

is

mounted
position
nector, which had previously

as

of

With

the coaxial cable. The

cable

connéctor for

on the front

formerly

i.f.

the
axial connector coupled
to the intermediate frequencv
turn

coupling coil, approximately
measured with a normal
operating
than 50 volts
of course

on a.v.c. With the receiver

peak

quite trdequtrte

sories mentioned in

now

serves

the circuit rvill

the i.f.

in Figure

external

of

as the

gain

rvhen

be very

amplifier rvas

77 to bring out i.f.

devices

F.NI.

adapter, or another

merelv rvrapping

form

the

between

the two i.f.

connecting

side to the

of RG-58/U

cable.

by first removing

into

the transformer

trnder

from

u'hich

rvire rvas

the insulation

the black

ream

to

removed

and Ih" irrrr",

outer conductor

grounded

is

outside the transformer.

the coaxial

panel

of the receiver

occupied bv the

been removed.

energy obtained from

to an external

by means

10

signal input

could be obtained.

to operate

previous

the

paragraph.

crystal-out
the

crystal

small.

made

energy

such

as a

panor-

channel. The

7 turns of

coils in-

one

side of this
center con-

The cable is

grounding

and

the screw

rvire tvas

hole

the

sliehtlv in

cable was

in

power-cable

panel

the

coil resonated

of

a small

peak

volts

and

on

receiver

the

MVC, more

This voltage is

any of

the acces-

posi­filter

in

hook-

the

adja-

from

order

"orr-

of

the

con,

co-

7-

was

66

Sunprus

Relro

CoNvrnsrox

CONNECT TO IH€SE

I

I 3

POWER

ÎRANSFORMER

FOR

SCHEMATIC DIAGRAM

The

color code shown of the
C-228
Íormer is
two 6.3-volt

Cr, C:-l 6-pfd. 450-volt
T-700

v. c.t. 100 mo.;

o.; ó.3 v. 3 o.,
in series with

grounded,

C.22I IYPE

power

not ovailsble

Ot

COLOR

CODE:

transÍormer
windings

ó.3 v. 3

12,6

NUMAERS

ON RECETV€R

|

2 6

rtllttl

:

REO

BROWN:

:

aLUE
BLACK:

Figure 79.

OF THE

bottom of

which
o conventionol
moy be used

elect. CH-15 henrys

5 v. 3

o. Rr-l

center

c.t.

v.

CONNECTOR

.tO

It

VOLÎS

I IO
t2 VOLÌS, NO

lZ

VOUTS,

YELLOW:

H.V,,

POWER

may be availoble.

power

os described

R1-l 2,500
S-S.p.s.t. o.c.

F-3-ompere

7

E

COMMON.

C.T.

SLAIS WITH TRACER

C.T.

SUPPLY

the drowing is

tronslormer

00,000

BLACI( : I20 VOLTS
GR€EN

óhms

ohms 2 wotts

fuse

=

Il

this trons-

in

the

100

l0 lvqfts

tine

.IO5

VOLIS

=

C.r.

UNIT.

lor

hoving

texl,

mo.

switch

tfie

tube in
er, since

receiver

place

the

If
system
wire coming
of R4e
side

wall

grid

The
and changed

added
output
impedance
impedance
speaker
through
in

T2

feed

the
izing
is

used

/

across

wise

to

insure
heater

place

the

presence

the

preclude

will

shown in

desired,

the volume

can be left

from

on the Group

of

the chassis

leak

on the porver

to a 470K

to

couple

transformer

ratio

of

about 1000

transformer

transformer

the

secondury

phones.

resistor

Ra7 should

as

noise limiter

the heater

ground

that

terminal

all the

voltage.

formerly

of

the

occupied

power
installing
photogràph

the

control
unmodified,
S12 is

I

terminal

in

removed

board

and run

audio

ló

rvatt.

Capacitor

to a conventional

on the

of T2 inside

external

the

ohms is

if

T2. Due

The

the audio

of

this transformer

60-ohm

output

to the

filament

be removed,

its

heater
of the

tubes

6V6-GT.

7 of the

will

be

socket for

by

the

supply

the

noise

of

the

gain

and

which

case

from

the

on

the right

to

the noise

tube

R33

C6 has

5000

to 8000

loudspeaker.

set is

7:l

required

is to

voltage

was

current

and if

should

In

any event

operating

transform-

inside

silencer

BC-812.

control

the green

bottom

silencer.

is removed

been

ohm

so

that

on

be

taken

step

down

used

equal­a 7A6

placed

be

it

the

688

proper

at

the

in

end

out-

The

an

the

to

is

to

Audio
Chonges rcceivers

System Tlic

audio s)'stcm

le,tives

There is inaclequrìte gaìin

tion

of weitk
sponse is
tary use
these undesirable
relativcìv
in Figtrre
placc

the 6R7 dioclc-tliode previously
6F6 u'as replacecl
plate

of the 6V6 to

the 688

rcduce l)armonic

and

rìlmost completely
svstem of
tu'o stages
pfd.

25-r'olt
lesistor of
completclv cut off

in

dou,n

Tìre audio transforn-ìc.r'

circuit of the 6Iì7

in

left
apperìr('cl
silence.r,

of

ers

the BC-3.12 serics, it n'orrlcl probiiblv

rc'lnove

signals on

poor (though

cluite

and

),

the

simple

80. A

688

u'itlr a 6V6.

\\'as

used

reccivcrs.

these

\\'ere

left the

electrolytic wrìs

thc 688 so thitt

tlie it.v.c.

placc:

sir-rce the

be difficult

to

be describcd

to

transformer

tliis

crystrìl filter,

hurmonic

coì'ìditions wcìre

c'hirrrgc

in

tlrc,

diode-pentode

plate

1l1c

improve

to

of the

distortion.

eliminatcs the lium in

TIte cathode resistors

samc, but an

plrìced

the iurdio output s'hen
position.

tlrat u.as

is r('rnoved

spacc

to

later. is

itncl institll

of tlie 312

muclì

to be

the frequency

intentionallv

distortion

so

is

severe. All

overcome

auclio systern

wiìs

used

used,

Shturt feedback

pentode

the frecluency

Also,

the feedb:rck

itclditionrìl

across

tlie

the

[arin

corìtrol

ttrrned

usc(l in

frorn

the circrrit

wits

not rc.(lrlired

remove.

to be

\\/he-n

usecl in

bc best

the noisc

and

342

desired.

for recep-

re-

for

mili-

bv the

shown

to re-

rìnd

the

from

the

section

of

response

the

audio

for

tlie

25-

cathode

would

cleiu'

plate

thc

btrt n'as

and it

iì noise

receiv-

to

lirniterr

Unmotked

-rfd.

Cr-O.l
c.,-25-lrd.

-ufd.

C

r-0.1
C,-0.05-rrfd.
C:-0.01-rfd.
Ci-8-11fd.
Rr-l
R:, R,'-l

00,000

,0

450-volt

CHANGES

componenfs

400-volt
A0O-vof

400-volt
400-volt

tri

ohms

tubulor
elect.
t tubulor

tubulor

tubulor

elect.

wott

t/2

25-volt

megohm

R4-

Figure

IN

THE BC-3I2

ore olreody

be removed or

wott

Rs

80.
RECEIVER

in the

receiver

replaced.

R,,

R;-470,000

R,'-1

.0

R--l

.0-megohm
R'-220,000
R,,, Rrrr-47Q,000
Rrr,

R11-22

RLr-Reloy

and

megohm

ohms

ohms 2

inside receiver

v.

8i I 05

REGU

TO

LAt€O

OSCTL-

LATOR

need

not

ohms

/2
potentiometer

ohms

wott

/2

wotts

wott

Vz

1/2

vr.ttt

wott

-

MeNuar-. Vor-uvB III

Figure 81.

BC-348P RECEIVER,

AND POWER

pover

fhe

supply is

speoker housing.

SPEAKER

SUPPLY

mounted

67

in

the

Noise

Silencer

The noise silencer shown in Figure 80 has

found

been

to

N'fc. band, and on the

bands r.vhen a converter

half

One
tube
may be

of a 746

drarvs only

fed

with
22-ohm 2-watt
heater line. Or,

parallel

in

with the

tube has been used, and since

150 ma. of
a balance to
carbon resistors from the 12.6-volt

if desired, the

6V6-GT
previous paragraph. One
could also
ter
possible

be used
require 300 ma. of

tubes

that a

one has not been

noise limiter

the
is made to the

return

if the

rvill not be

action

to take the

vided
the circuit
tortion

does

on a

Goin Control
Chonges

for

the

12H6 could also

tried. Make sure that the

(the

bottom

cathode of the

is

made to

obtained. A srr'itch

noise silencer out of the circuit. since

introduce a detectable amount of dis-

short-wave broadcast

It is

a convenience
cations
conuol for audio and

in

accomplish
cussion
of the
taper

low-potential

the
returned to

this

it is suggested that

panel

be

potentionmeter. Cir and

sround.
pulled dorvn to
nected
rvhich
occupied

to a separate
can be

by the

the series of

replaced b1, a single

end of the audio

The

the undersidé of the chassis and con-

15,000-ohm r.f.

placed

MIKE

either

jack

be verv effective on the 14-

28-NIc.

is

used ahead of the receiver.

heater

current the

ground

heater

heater

half

as

of a 6H6

and 50-Mc.

mearrs

by

may be

discussed

or

6AL5 tube

heater

of two

placed

in the

noise limiter, but these lat-

lieater

have

been used, but

current,

It is

returt

end of Cr, Rr and Ra)

688 and not to

ground

proper

Sl has

ground-

noise-limiting

pro-

been

program.

in a communi-

receiver

to

have

r.f.

a separate

eain.

receivers under dis-

the dual control at the top

)ó-megohm

audio-

R32 are removed,

gain

control is

can be

taper rheostat

formerly

of the

r.f.

gain

control leads

in the

just

or

gain

position

to the right

this

for

To

and

SEND-RECEIVE
switch

u'ill

still short out

su'itch. The

the

a.v.c.

r.f.

sain

conventional manner.

Control
Circuits the

connection
and
Power

1,2-contact
mounted
chassis.
which
ing. The

Jones
inside

on

the connector on the rear
on Figure
series with

Since a l2-volt keying relav is
the
wired so that it closéd "r,"iv ti*"
ing relay

In

In

the case of

9-terminal

removed

receptacle

replaced

by the

and control connections

Jones

by means

The receptacle was

already exists

connector on the end

S-312-FHT. The key,

receiver were

the

the BC-312 receiver

por,ver-connection

and the

somewhat unsightly

on the front

"i.f.

output"

rvere brought

P-312-RP

connector

of a bracket

aligned rvith

on the

rear

of the

shorting

then rewired

panel

coaxial receptacle.

to the rear

of the

relay,

of the cabinet

80. The srvitch
the center tap of the

antenna-shorting

is

relav

connected

porver

used

on the transmitter,

inside

the receiver

the transmitter kev-

closed.

modifying the BC-342 series of receivers
external control circuit connections for
can be brought out of the front
the

connector

Amphenol MIP-8

an

which

installed

is

octal socket, which fits

panel

on the front

mounting holes.

Hints

The BC-348
tory for comrnunic:rticns use
but as in the case

the BC-348

on

series

rf the

Series Receivers

receivers

of

in

the amateur

BC-3I2/BC-342

are

position

of the

control in

as shorvn

strip was

multi-

was removed

out

which was

of the

the

cabinet hous-

power

cable is

and switch

to connections

as shown

so that it is in

transformer.

the transmitter

replacing

by

panel

the same

quite

satisfac-

station,

series. there

the

to a

hole

a

was

the

by

68

Sunplus

REAR VIEW

Showing
in the
oclat

Remo

Figure

OF THE BC-348P

ASSEMBLY.

powet

the

spoker housing

poweÌ piug

on

Couvpnsrom

82,

supply

mounted

and the

eeceiver,

the

are several minor modifications lvhich

improve

to

performance

the

and flexibilitv

equipments,

BC-348Q
lnformqtion miiy

volt a.c.
filament rvinding is not rcrrdilv
C-228 transformer mentioned in

BC-3I2 may be used

series ) so

for

ers
side of the
and
mon for
the
ma.v be used either
side of the
wires and a solution to the

Generol The BC-348 series

be operated rvith

supplr'. But a

circuits

porver

unchanged from a 26­transformer rvith

availarble

connection

rvith

the filament rvindings

it is in most

operation

heater

cases best to rervire

from

of

volts.

6.3

each

tube should be

This means

the other side should be broueht

feeding from

orieinal

l.reater circuit,

"sèriesins"

the 6.3-r'olt line.

rvires betrveen tube

fòr the

grounded

recluiring

addition

problem

cramped spaces.

The a.c.
mounted
motor
important.

power

in

tl.re space

if

space considerirtions

supply

Hor.r'ever',
from the stilndpoint of
supply

dissiprrte's .ì
namotor origintrlly
for additions to

an extri.r

audio stage, or a broad-band converter.

great

instnlled.

receiver

the

The externarl a.c.

made

somew'hat

oversize
meter or a converter or an
In this event
negative
on the BC-348Q.

it is desirnble to be able to

leacl of the

plite

It

is necessauy to change

for

formerlv

occupied bv

and

procedure

this

ventilation

deal more

The spnce

such as a noise limiter,

operated

pou'er

for operation of

additional

supplv,

receiver

the

portability

since an a.c.

heat

station accessory.

rvhich is

may

be made

of

the

receivers

of

the heater

such a

(erlthough

the

with the

heat-

the

that one

srounded
out ai a com­In

many

cases

sockets

side or the hot

ferver

of

rvorking in

of

may be

dyna-

the

are very

is not

desirable

power

than the dy-

is

more

useful

supply may be

a frequency

ground

the

not done

the bias

circuits
verter
the
and resistor
unbiased.
in
audio
should

6547

in

in the cscillirtor

ceiver.
resistor
lug
rvith

of the 6K6-GT

to accomplish

B minus

and

remove

108-2.

A

470-ohm 2-u'att resistor

series u'ith

the cathode

strrge. A 25-r'olt

pliiced

be

About

1.8 r'olts

ircross

convcrter stirge. To

can should be

The contact

is

87-2

available

mav be mounted

positÍve

thc

side

audio

stage and

this.

The first

connections

This leaves

terminal

25-pfd.

this cathode resistor.

of biirs is used

obtain this, resistor

junction

at the

projecting

as a

a standald miniature

grounded

to the lug.

Audio

Addition of a noise-limiter
Considerotions Radio Hotttlbook)
in the

BC-348Q

operation in

tion interference

band and is

rvith

a converter on the lS-\ic.
addition
especiallv
Tlie added
tional circuit

almost a necessitv for

of an extra

for use rvith

stage of auclio is

thc cn'stal filter

tube mav be a 6SF5

valuers

(see

iinv standard

a 6SJ7 stage u,ith feeclback'mru'

Difficultl'mav bc ctrcottntered

tem of the receiver afti'r the addition

stage

and the

resistor

noise lirniter

on the second

due to the common

detector
This trouble m:ry be avoided bv isolating
cathode circuits. The lead betrveen

rernoved

is

and resistor 105 is either

step

to choke 155-B

both the

should

of the

electrolytic

on the

clipped

of this resistor

lug.

trnd the

presence

the

on the 14-Mc.

use

of the receiver

or 50-\lc.

also

on 14-Mc.

triode with

reference),

be added.

rvith

and the

third i.f.

the

removed

the 65A.7 con-

ground

is

to

above stages

placed

be

6K6-GT

capacitor

grid

of the

l0B-1

out of the re-

and

Lrpon

this

bias cell

negative

side

(see

rvill improve

igni-

of

bands. The

desirable.

c.w.

conven-

or

the audio

of

sys-

the audio

cathode

stage.

these

two

two cathodes

or short-

MeNuer..

Volulrr

III

69

i.f.

leaves

This

ed.

capacitor

and

cathode

The

grounded

70-B

and

room inside

portion of the

a

as

I

the

noise

should
former.

power

supply.

third

limiter

be

The

placed in a

jacks.

phone
Mechonicol

Considerqtions

the third

in its cathode

6l-4

second-detector

the

of

chassis.

to the

be

now

may

the equipment.

filter
lead

The

i.f. transforrner

inserted

at this

left to by-pass

switch

on-off

position in

panel

plug

If a
block
socket

round

liberal use
tapping
aluminum

be necessary

not

case to

the

A socket

back of the

the
for the speaker
a two-post
er silencing
diagram

wired

or
manner
transmitter

The

connected

light control

BC-348E,

ond

of a

mounting

guide

pass

terminal

These

).

into

that

is on

seriesed

to the

M,

Receivers

P

holes

is removed

box

enlarge

to

an octal

punch

may

case.

One

connection,

strip

circuit

(terrninals 2

terminals

two

the transmitter

receiver

the

the air.

lamps should

dial

6.3-volt

resistors

lll and 81 out

Changes
are

(J),
porver audio stage

the

onlv

except
fied
supply.

cannot

that

grounding

when

Also,

isolated since

be

the negative

tlie second

stage

The large capacitor

removed to

6-pfd. section is

The

capacitance

-at

the low-potential side of

should

be opened and the

point. Capacitor 27-3

the secondary

for the

cannot

noise

place

of one of the

fit the

to

be secured, an

may be fitted

file and then

for the socket.

from the case

rectangular

the

power plug,

be used

hole

to make two

is

used

and the

which

is rvired to the

and

may

control

is disabled

heater circuit

in

this series

generallv

(N),

the same as

and

detector arnd

are in the same tube

they

envelope.

for a

in the

a convenient

housing

Fisures

wherety

ceiver

81

the

be mounted

may

and

power

82 show

suppll'

speaker.

Modulotor

or BC-I9l

problem

the

solve

to

or the

for components,

drawers as

èquipment,

with the

along

other components

and 84

quite satisfactorily.

One

use

to

way

of the

the

for

A 120

good
àssemble
housinss
""trory'pieces
housing of
formeri
semble
assembly

the

and

modulator.

a

which

I40 Wott

BC-375

in'ivhich

BC-375E
tr-rning
the

miscellaneous

drawers

tuning

test

of

transmitter

Figures 83

operates

resistor 102

with

tube

ground.

is now

circuit to

can 70-A

make additional

in the external

of the trans-

silencer

rear

may be

connector

into the

by drilling and

If the cast

hole in

holes in

pass

to

other

hole

the

to

receiv-

in the circuit

6

then be shorted

circuit

in

whenever

parallel

be

with the dia-l

of the circuit.

receivers

of

(Q)

series of 348's,

must be modi-

lead of the

third i.f. stage

method

BC-3'18

for

series
the

from the

of making

BC-f91

and

is

use

cabinets

for ac-

use the main

audio trans-

show one such

ideal

head-

octal

by

set

it wíll

plug

reach

such

the

and

in

the

power

loud-

dis-

to

the

to as-

re'

a

lhe ,ront cover

All components
including the
sheet
Figure 85.

antenna

the
it might be
modulator
should
upper
for the speech

for the negative

cuit
the audio

The
mounted
after

circuit
An additional
panel

by removal

ieft
filter

in a single-ended

2ll's.

MODULATOR

AS MADE FROM

been removed lo

hos

componénts

on the upper

chassis,

aluminum

to

The end

was sawed off

tuner

retained

if

components

of the

to

be obtainable.

deck of the

chassis

amplifier,

transformers.

clipper-filter

housing

in

the

alì

for

the r.f.

components

the speech

panel rvas

multitude

the

covel

to

the

of

speech amplifier

684-G

Provision

has been

83.

Figure

A BC-375E.

on úhe nev chassis.

srtov trte

placement

deck were

bent from

new chassis

and a

hold the components

main

was

shown

housing which

as unnecessary,

house the

The components

a simple

100 volts on the

audio

for

power

the

of

include

amplifier

of the tuning

one

supply

proper dimensions

mounted

power

the

regulated bias cir-

grids,

2ll

and

had been removed'

amplifier

is

shown

in Figure

placed in front of the original

of holes that

r.f.

components.

The

is quite conventional,

which acts as

in

made

driver

input circuit of

the

ol

removed,

held

but

for the

on the

supply

and

driver is

drawers

The

86.

had

been

clipper-

ending

for

the

in

70

Sunpr,us

Renro

CoNvsnsroN

AN/ART-I3

The

AN/ART-l3

mitter

for
meter
operates
or
200
ating
remotely
position.

herein
set frequencies
bands
m^eter
of
panel
waiting

system
arated
in
the frequencies
tion.

makes

phone

smoothly

bands.

watts

and c,w.

Under

stably

yery

keyed

input.

convenience

controlled

lVith

the Autotune
and

one

ba-nd.

Operation

these frequencies

selector

approximately
to operate.
by

not more

the

28-Mc.

Autorune
Tronsmitter

Autotune

a very

band

satisfactory

operation

normal
and puts

signal

The

Autotune

rvhether

or

the

circuit

system

throughout

additional

i,s

obtained

srvitch

If

desired,

than

with

available

Aircroft

aircraft

on

the

conditions

out

rvhen

feature

the

tr:rnsmitter

controlled

modifications

allou's

the 80, 40

frequencv

with phone

simph'

to

the desired

25

seconds

several

about

50 kc.

an increasine

for

lower

amateur

80, 40, 20

the transmitter
a cleanly
it is

running

is a great

from

the

operation

and 20

in

the

or c.w.

bv rnoving

position-and

for

the

frequencies

màv

r'eduction

frequency

Rodio

radio

trans-

transmitter

and 10

modulated

about

oper-

is to

operating

describeà

on l0

mèter

l0

or

on any

Autotune

be

set rip
opera-

be

pre-

Il

one

the

sep-

il

w

Figure

84.

REAR

V]EW

OF THE BC.375E

the speech
phone
S to

select either input
trol R1a,
undistorted
stage.

Measurements
1250-volt power
2ll tubes,
watts

tion discernible
scope. An
amount
for amateur

output
from the
test

lleriod

The 7000-ohm load impedance
ed by a Class C modulated r.f.
from

the same

plate

at a

225 watts

oÎ
may be modulated
tor unit.

amplifier for

both

and a cry'stal-microphone

circuit.

must

be substantially full

output

from the 9ll

of the complete

showed

of audio

supply

output

to the ear

feeding plate

that it was

from

the tubes with

or noticeable

output of I45 rvatts

distortion

of

rvhich r.vould

communications work.

transformer was noticed

into

stage

about

of

plate

7000-ohm

a

one hour.

supply as

current of 180 rna. This

to the Class C

stage,

without difficulty

a single-button

The

possible

rvas obtained

the 211's

MODULATOR.

input,

with

clipping

level

open for maximum

tuÈes in

the output

modulator,

voltage

to obtain

no

on

the oscillo-

be quite

tolerable

No heatins

rvith

120 watti

load resistor

could

amplifier

represent-

be

operating

(1250

represents

an input

an amourrt

by

the modula-

micro-

a

switch

with

to

distor-

with

of the
output
over

volts)

which

con-

the

120

an

a

PLAîE +9
ca4G

ÎO

a

C'-8-pfd. 45O-yolt
Ct-40-pld.
C:,

Cr-8-irfd, 450-Yolt
Rr-l00,000
R'-7500
R,-5000
R,-50,000
Tr-Driver

T"-Mod.
Tr-10-volt

î-cr

-8

i t5 v.^.c.

SPE€CH

AMPLI FIER

MAIN ASSEMBLY

MODULATOR.

elect.

35O-yolt

ohms Io làrts
ohms

ohms 20 wotts

trons.

trons. from

ó.s-omp.

elect.

ohms Y' wqtt

l0 wotts

from 375E

375E

fil,

elect.

trons.

\y_,,

FíEure 85.

SCHEMAT]C

Tj-700
CH-12-hv.90-mo.

MA-0-500
V-Voltmeter
Sr-Phone
S"-Moin
S,-S.p.s.t.
SOr,

OF THE BC-375E

v. c.t.

volts 2

d.c.

f rom

c.w.

switch from

o.c. line

test

switch

90 mo.,

omperes

choke

mq. from

375E

switch

receptocles

o., ó.3

SO-Twistlock

5

375E

v.

375E

3

MeNuer.. Vor,uur

SCHEMATIC

-

pÍd.

Ct-25
Cu-0.1-gfd.
Cr-8-pfd.
Cr-0.0.|
C:-0.1
Qel75-ppÍcl.
Ct, Cs-2O0-ppfd.
Cr-0.01

25-Yolt elst.

400-Yolt tubulol

45O-volt

-pfd.

-pf

d. 400-volt tubulor

-pfd.

elect.

400-volt

mico

mico

400-volt tubular

tubulor

III

osNzcr

{

Figure 86.

OF CLIPPER-FILTER SPEECH

Ctr25-ufd.
Crr-l O-pfd. I 0O-volt elect,
Rr-ì.0 megohm
Rr-1300
Rr-I.5 megohms
R,-220,000 ohm
R5---47,000 ohms

25-Yolt

ohms

72

/2

/2

wott
V2
72

elect.

vott

vott

vott

vott

AMPLIFIER FOR

Rr500,000-ohm
Rr-l00,000
R\-100,000
R!-100,000
Rre330

Rrr,

Rrr--{7,000

Rr:-ó20

ohms I wott

ohms
ohms

ohms

ohms

ohms

osrzcr

{

THE BC-375E

potentiometet

ìrott

/2
I wott

wott

!/2

y2

vott

I wott

IO

H€ATERS

OF

OTHÉR fUA€3

MODULATOR

Rrr-250,000-ohm potentiometel

Rrs-750
Tr-Mike-to-9rid
Tr-ó.3
CH-3.5 to 3.75
Jr-Crystol-míke
J-Corbon-mike

ohms

volts ol

l0 wotts

tronsformel

3 omperes

henry choke
iock

jock

7L

Power The major change
Supply

ART-13 for amateur use
for operation of

115

volt a.c.
the nature of operating
purpose

The simplest

provide

to
for operation

relays

the

power

ated

voltages.

bias
taining componcnts
supply,
portion
heater tubes lelal's
tlie filaments of

line. All other changes

conveniences or are for the

of obtaining

operation

way of converting the equipment

solrrce of 26 volts

a

of the tube

Autotune

and

supplies

Horvever,

filaments

motor. Conventional a.c. oper-

are then

due

for a

it was deemed

to use a

rl-amperc

desirable

rincl Autotune motor, and to supply

thc 813 and

26-r-olt d.c. supply for the

transformers.

pon'er

The
been
tion

to a

the

designed

with the

complete

follou'ing

supplv
and constructecl
AN/ART-I3 transmitter.

set of contlol

potentials
power cable: 1250
400 volts at

negative bias

of
for the

the 811's

a standard
panel,
house

Several

supply
items are
necessary

choke

225 ma.,

blorver and

and the 813.

cabinet

Careful

the

are

component

power supply

the components

of

surplus

not available,

have either the

to

for

26-volt d.c. supply

the

for

unit shou.n

to tl-re

volts at a

26

volts

keying the

for the fil:rment transformers

power

The

which takes

placement is necessary

unit

items since standnrd

In certain cases it rvill

required to adapt the

is

that

the equipment

providing

of

from

the

described are in

in

d.c.

used for
to the

28 NIc. region.

the

about 9 amperes

at

heaters

and

plate

and

difficulty in

and

for

grid

ob-

high cnrrent 26-volt d.c.

in

the conversion

thc 811 from filament

in Figure

especially for

In

circuits the unit

ART-13

miìximum

through the

of 300

has

88

opera­addítion
supplies

ma.,

at 4 amperes, 350 volts

and 115

813,

volts a.c.

for

is

supply

a 121í bv

housed in

19 inch front

to

in

a cabinet of this size.

in the 26-volt d-c

used

manufactured

be

transformer or the filter

made up

especially

{or
rectifier
a
so
circuits
supply

is

the filaments
are lighted

for a period
takes
for
stall

job.

the

is

obtainable it

l0-ampere

that no

of the

and control

Initial

operation

place

the 813. It

a

cooling exhaust

If

a 10-ampere 26-volt

power

transformer

changes will

transmitter.

circuits

are

from

liehted

all

d.c. irnd

of the equipment

of

time showed tl.rat

in

the region

s'as therefore

equipment. The particulirr
item

but similiu
proximately
hardware
unit runs quite
is

completely
operation.
the blower has
the housing fol
formers

foi

a.c. operated blou'ers

1500 r.p.m.

stores.

\\zith

cool and

eliminated

the

been

particular

mounted

In

the transmitter rvith

the 811's and tlie

this box.
Control A

Circuit
have reached

plate

voltage is

available,

time-delay reìay rvhich
the 26-volt d.c.
in

the equipment to insure

norrnal

arpplied. If a 26-volt time delay is

a 115-volt a.c.

be used. Protective interlocké have

power

the
the ART-13
nected
nected in

in

series and

series

suppìy

unit

transmitter. These trvo

in

with

the

output

will probably

be required

The high
can be the
from d.c.

some from

be best to have

and choke

in

voltage

same whether

or

some of

a.c.

rvound

the filament

at full input

considertrble

behind

dcemed

blorver

blorver

plate

the

tank circuit

desirable

on the back

used is

a surplus

running

are avnilable

this blorver in

overheating

from

the

operation

of components

even rvith long periods

unit shown in

in

a box

Figure

on the

the filament

813 also included

operates from

supply

has

been included

that all

operating temperature

relav

of the same

type may

been oro.'ìd"d itt

in the

and

actual ìabinet for
interlocks

turn the two of

lead to

the

them are con-

plate

porver

selenium

also

power

them

heating

in-

to

of the

at ap­larger

the

of

87

rear

of

trans-

within

tubes

before

not

are con-

relay

72

Sunpr.us

The boy. contqinìng
the lilomenl
813 ond
the tesr olongside
vhich holds
the 28-Mc,
lot the 813

Reoro

TOP

OF THE CONYERTED

tfie 8tt's

CoNvnnsroN

Figure

87.

AN/ART-I

the 6L6 multiplier

bond. Ihè 28-Mc.

csn be seen inside

Cdbinet.

3.

the btover dnd

ttonslormets

cqn

the

be

lot lhe

seen on

smoll

box

Íor

tank

trre

RYl

so that

plate

voltage cannot be

transmitter if the cover has
ART-13
has

been opened.

Provision has
the transmitter
ART-13
tion is moved from

position,

c.rv.

if

or

the top door to the

been made in the

so that

its

or

counterpart at the remote

when

the off to either the

the transmitter will

this switch closes a circuit to

find

to
main control

isolated

an

relay.

source of

This

source of

tained by leaving the small

the line at all

across
the socket.

However,

off there is no

power

that

times

when the transmitter

drain from

of this transformer.

push-to-transmit

The
cluded in the

power

operate and relatively

single

a

with its
is shown
is

open and the

tube

6C5

operating

associated components. The complete

in Figure

voltage
is impressed cn the
its plate

current. When the

circuit which

supply unit is

simple in design. It

88. When the key is
drop across R;

grid

of the 6C5 tube,

applied to

been removed from

power

supply

control circuit for

S111y on the front

control
voice or

be turned

ground,

potential

it

on. Since

was necessary

to operate

potential

transformer Ta

connected

the unit is plugged into

is switched

any of the

has

very

secondaries

been in-

pleasíng

consists

from

the bias

supply

up relay RY;

to the

cutting off

key

pressed

is

RY5

of the

was

along

circuit

slider

closes

the
the

box

posi-

the

the
ob-

to
of

and

the right-hand

from

the

813 by shorting
through
in
click filter.
ed by
transmitter

Re and CH6. These

conjunction rvith

The effectiveness

the fact that clicks

on a communication

same band for break-in

At

the same time

of contacts

its

to
tìrough

closes

on this relay

cathode, causing full plirte

RYo and Rr, thus cìosing

the antenna chanqeover relav

operates and

ter by RYr. Then when
so that

plate
to the time constant of tlie R,;-Cc
current

still flows through RY,;. Hence
age remains

is
mains in

still

in

the transmit

this condition
built up to such a
everything back to the

this delay is variable, by

of

side removes

grid

the

lutter

Cs make up

of the circuit is

cannot be heard from

c.rv. operrrtion.

that RY.;

is

shorts thc

plate

voltage

is iipplieé to

ker.

thc

current to the 813 is

the transmitter

on

and

position.

until

the

value

thtrt RY6 drops

receive

condition.

adjustment

the blocking

return

\'en'

.ì

rcceiver

closir.rg,

is lifted

stopped, but

combination, plate

the antenna relay

The transmitter

voltage

meter R;, from a fraction of a second
seconds. The normerl setting

is

for

about

grid

bias

ground

to

tu'o components

effective

key-

illustrat-

the

tuned to

the

grid

of the

current

RYa.

When RYa

in

the ART-13

the

other set

6C5

to flow

the transmit-

RY5

opens

due

plate

the

volt-

re-

across

C6 has

out, changing

The

amount

potentio-

of

up

to about

3 seconds

15

so

MaxuAL,

Vor,urtm

III

73

Cs

CHt

lCc

CHa

lCs

I NTERLOCK

O-

-

iIl'*

*e'

)

+26 V.

5V.

STANO6Y

H.V. ON

ANTENN/
CHANGE

ON.OFF

1f5V.

+26

PLATE

6r3
atAs

+400

V.A.C.

fi3

V.

v.

Ct, Cr-4-pÍd.

copocitofs

Cr-4-pÍd.

Cs,

coPocitors

óOO-volt

O-p"Íd.

Cs-l

pÍd,

Cc-0.5-

-pfd.

Cz-0.t

-pfd,

Cs-0.05
Cs-499O-p,Íd.
Cro-8-rrfd.
R1-50,000-ohm

Rz,

that

short

to

450-volt

bleeder

Rr-22 ohms

plate voltage

the

pauses

receive

the

has been

Chonges
ART-I 3
Circuits

operate
rna
the

from

illustrated

meter

manner:

(235-ohm

terminal

to

tor
goes

terminal

to

lerminal

|

500-volt

ó0O-volt

coPocitor

tubulor

600-volt

tubulor

400-volt

400-volt

50-volt

| OO-wott
2 wotts

in a

tubulor

elect.

elect.

c.lv.

condition

completed.

in

Control

power supply

the

in Figure

switch

circuit

Remove

resistor

)

A2

Bs

Sror

of

Az

SCHEMATIC

will

transmission

seconds

3

is necess

It
number
various

to allow

order

88.

be

ground

connect

and

Remove

Sron.

of

Srnn

of

along

R{-10,000

00,000-ohm

Rs-l
Rc-2.7
RT-!5,000
R\-50,000
R,,-15,000
Tr-t 500 v.

rno.,
175

(

urc

v. 3 c.,

T:r-5
Tr-700

ó.3 v.

Ts-35

remain

ary

modifications

of

circuits

unit
is necess

It

changed

bottom

from

this

connect

and

with the

DIAGRAM

l0 wotts

ohms

Potentiometer

megohms

v. c.t.

yolts

on

but

after

to

y2

l0 wotts

ohms

20 wotts

ohms

2 wotts

ohms

eoch

eoch side

400 v.

common

lno.r

PA-303)

2.5

volts

mc., 5 v.2

70

(UTC

2 o.

q.

5

ot

for the

will

transmission

a

make a certain

ART-13

the

of

equipment

the

described

ary

in

the

end of

of

end

wire that

the

this

bottom end

Figure

OF THE

wott

300

ot

side

(speciol)

l0 o.

R-2)

c.t.

ot

o.,

normal

drop back

in the

before

first that

following

Rrrt

resis-

the

now

wire to

88.

POWER SUPPLY

CHr-250-mo.

CHz-250-mo.

CHr-200-mo.

CH:r,
CHs-0.05

(speciql)

3-henry

CHe-l

choke

RYr-28-volt

reloy

| S-volt

Ryz-l

RYs-ó.3-volt

reloy

combined

above.

Rr'
return of
power

Connector

The

control

now

now

the side

this

terminal

the

in the

in
to

which

lead

on

sulate

to

2 on

C

brought

through

Tlie

re-wired

be

mounted

of

THE

FOR

swinging

filter choke

filter

ot

henrys

óS-mo.

4-pole d.t.

d.c.

q.G.

2-Fole

5

or

(RYz

ond RYs

if conto€ts

This

the BI3

following

circuits:

goes

going

of the

lead.

14

of

loading

power

of

out

main

the

filaments

to

the

on

AN/AR,T.I3.

choke

chokes

4 omp.

filter

relcy
2-Pole

volt

mcY

series

tube
Jtoa.

changes

Ground

terminal

to

terminal

to

antenna

run a

Now

Jrru.

coil
supply

the

power

of

operate

rear

Ryr-28-yolt

RYs-28-volt

aÍ

of

out

RYc-2500-ohm

Elimstot-A.c.

changes

terminal

to

be

are

lead

the

8

of

L4

changeover

lead

is

lead

A

relay

connector

unit.

transmítter

connector

and

813

the

from

of the

equipment.

RYs con
ompefes ond
ore ovoiloble.)

loy
loy
ccross
volt

feloy

cqrry

d.c. time-deloy

(l

lS-volt

relqy msy

Primory

not ovoiJ.)

reloy

d.p.d.t

line

brings

2 on

required

in

inside the

fros.

which

Remove

on

Jrra

relay

from terminal

run from

now

jroz

is the only

This

which

does

Jros.

of the

separate

811's

transforrners

One

obout

3 Gontocts

if

o.c.

be
Ts iÍ

of

keYing

sensitive

filter

the

the

the

cabinet

mounted

is

Kror.

8 of
terminal
terminal

to

not

side

re-

time-de-

usd

28-

reloy

grid

main

power

the

In-

|ros

lead

go

should

of

8

74

Sunpr,us

Ranro

CoNvnnsrow

the filament
center
grounded
audio peaks.
er

and

now

be
terminals
supply
driver
side of
the

chassis

Several

may

tap

of the

in

order

The primarv

the

cooling

connected

are

supplied

unit rvhen

transformer

the filament

of the

changes

be left

grounded

filament

to

eliminate

blower

to

terminals

rvith

the

equipment

returns

of

each

transmitter.

may

be made

supply

of the filament

for

the
6 and

115

which

811

the high-frequency,/lorv-frequency
or not
transmitter.
Lro-c

and
Lrosr.
rvall
interlock
cupied
leads

with
interlock
manner

ly in place
obtained

a 0-300
former
clipped
installation
ble to read

the lO-meter

In

as well

Tay

Cr:s mounted

One

additional

of

the equipment.

norv

by

Cr5

to

this interlock

the lead

should

that it is

on top

A

slight

increase

through replacing

or a

0-500 d.c.

T162 ma!

by unscreu'ing

of this

grid

band

[he first place

be removed

in

the space

hole

It is

be

mounted

on the

fire

should

going

now

of course

closed

of tlre

in

operating

onlv

transmitter.

milliammeter.

be removed

it

additional

current

and

is

to

the low-frequency

from

formetly

must

suggested

in

the

wall of

be

to terminal

be

when

the 0-5 r.f.

after

from

the

milliammeter

plant

simultaneously.
Converting

28-Mc.

for

Operotion

The

conversion

for 2B-N,Ic.

operation

c'omplislred

rvays

of varying difficulty.

Îo

cLos€

K-to3

........-

6.3 V. tO

6LO HE^T€R

-

SCHEMATIC

OF THE 28.MC. MULT]PLIER

oLo

Figure

Horvcver,

17

151.

89.

on the

to

hum

818

the

811's must

modulation

transform-

equipment

g

on

a.c. from

is in

formerly

are now

in

relay

Jros.

the power

operatio;.

went

grounded.

the

viciniW

K1,r; whether

be included

present

its

o"c.,pbd

be drilled

in

that a protective

position

formerly

the transmitter.

connected

mounted

the

in

3

of

Jr63.

in

cover is firm-

convenience

ammeter

The

r.f.

the leads

chassis.

have

\Vith

it is possi-

current

on thè

of

the ART-13

mtry,

in

several

in

4.2W,, RESTSîOR,
N.24AROUNO

úifferent

converting

It

7 î.
DIA,

STAGE.

but

the

be
on

should

These

The

to one

to
of

in

the

choke

position

by

the fire

oc-

The

series

The

such

can

be

with

trans-

been

the

813

be ac-

the

N.J4

3/4'

f"

LONC

unit
version

bly
no
best.
tripler
ity

from
9-.0 to_

1!e
27

the
used
deliver

range.

standard
to

the

the filament
the
be either
or

a

a 28-volt

from
particular

used
relay
mitter.
contacts
closed
voltage
transformer
are operated

The
conventional
voltage
spection

show

1625

ptrdder
particular
H9n9e,
rvhich
to I0.B N{c.
supply may

d.c.
50-irpfd.
of the
choke. In

of the circuit

The

of

the 813 is
side
These
ure

89 to the

on 51 is

plate

the
low-frequency

showrr

in

method

of

the

Autotune

changes

So it

in

was

stage

of

grid

the

the 1625

10.8

Mc. frequency

6L_6

then

and

32.4

Mc.

813

amplifier.

as

a doubler

excitation

The

6L6

metal

side

of the

circuit

diagram

a double-pole

the 28-volt

unit

but

it is planned

for

completely

The

relay

on

the

whenever

for

the

or

circuit

is

obtained for

of the

that

the 400 volts

multiplier

capacitor

section

by connecting

is

used

range,

be

line

rvith

mica

6L6 multiplier

this way

lead from

broken and

of the

point

two leads

used in

of the 813 from

photographs

the

which

did

not involve

mechanism

the

felt

on the

of

the

second

exciter

best

simply

rear

of

813.

The

mr,rltiplier

of the

the

range.

may,

be tuned

to ìnv

for feeding

In fact,

from

to

multiplier

"cabinet"

cabinet

transformers

the
grid

the

is housed

which

of the

il

which

for

multiplier,

double-throw

d.p.d.t.

relay

supply

shown in

for

the photographs

to

replace

remote

will

be operated

channel-selector

the 28-\Ic.

6L6 mav

from the

from

a.c.

of the

except for

be

suppll' for

6L6 multiplier

the mìnn"r

the 6L6

circuit diagram

appliecl

appears

to excite

C11;

of the

an r,f.

actoss

at

a time

paddt'r

tlie

chokc

grid

400 volts

obtained

r.f.

an

capacitor is

bv filtcrinq

choke

.uid

the.n

frorn

the 6L6 multiplic'r

except rvhcn

couplinq

control

crìpacitor

a lead

rvhere

tlre connéction

are then connected

multiplier

6L6

unit.

addition to close

the network

bands

to the

it

was

felt

any

and

which

transmitter

to

add

a

6L6 outboard

transmitter

6L6

tripler

in

The

tlìe

in

is

ART-I3

plate

freqìency

excittrtion

desired,

to tire

the

6L6 riay

same frequency

houses

the

811's

gi3

in

2,,

l"ras

been

the blolr,er

and

in

by

of the

Figure

ceramic

which

may

the

transmitter.

[hJ

operation

by

switch

band

is

obtained

the

is

be

switch

of

another

which rvill

chosen.

from

811's if

otlierwise
in

u'hich

multiplier.

of

the

ART-13

to

onlr-

the

onc.

plate

scction

ancl onlr.

citp.rcitor

padder

to

of

tlie

6L6 in

front

tlie

exciter

tlie r.f.

-pirss

ir br

used

tlie liot

capacitor.

to

excite

side

is

completely

A is in position

C116

to the

brought

as

One

K1s;,

out

shown

set

of contac{s

which

used

separate

28-NIc.

that

a con-

dis-assem-

reouired

*oúld
the

vicin-

fed

energy

in

tÉe

circuit

between

grid

range

lhe Zt"-Mc.

4,,

by

mounted

and

813.

51 in

gg,

may

srvitch

operated

In

the

a switch

with

the

trans­set of

be

Heater

a

small

they

quite

ilate

Carefúl

in-

will

of the

of the

rvhen

that

is

in

use.

capacitor

g.O

ihe

power

out

if the

the

erid

of the

r.f.

out

g.

grid

from

each

is

broken.

in

Fie-

switches

on

the

tank

b"

of
of

be

to

4,,

is

a

A

Mewull,

Vor,uur

III

IC

SCHEMATIC

îha s-vott
the trdnsrormer

series

ior
on

which has
cabinet

and 6.3-volt

ro obtaìn

LM.

the

the lilament

Due

of the ART-13

windings on

dre

connected

titament

úo úhe

vindìngs

been placed

the low-frequency
transmitter
sisted
inches in

shown

of

a 6-turn coil

diameter

the 2B-Mc.

link feeding a piece
to the left wall

pair

in

a

about

30 ma. on 28

The two

up

as terminals

plate

feeds

of the ART-13.
als are run

of

the transmitter

of terminals.

terminals which

7 and 4 on

and filament

Two leads from

to the 6L6 multiplier

closed whenever the
frequency
scale

on the

tripler as

grid

current meter
band; this represents
on the

813.

Figure 90.

POWER

in

vottase

lo.ad
lilo-

OF

LM

lìght

the

in

which

oscillator

of number

and

Lló inches

of 300-ohm

With this

Mc.

the

supply

is in

6L6

shown it is

about

8 to

THE

SIMPLE

SUPPLY.

ment

voltaEe

vot-ts

íi,y;.#'rt:ÍflZ|'i"Yr?!:r{!,:î

;;;i;;";"È;';;;

position

the

was designed

unit. In

tank

l0

line is

where

tank the

close

K165

connector

to

the multiplier

these

unit

operation.

possible

throughout

g

ma.

meosqres

on

the lilomenl

Meter.

inside

particular

the

for

the

enamelled

lone.

A

then

it

terminates

8lS

may

be

Jrrs

two

so that

With the

to

obtain half

the

grid

of

-i;-ii,;-ìrr;L";;i

to hold

BIB

wire lli

two-turn

run

dips

termin-

they

2B-Mc.

current

about

lead.

the

con-

over

picked

which

unit

are

6L6

ll.9
This

to

il:"

Note

to the

Network

cies

up
transmitter
on

an aircraft
resistance
relativeìy
network
tennas
use in
convert
ing

on the

this is

from
transmitter
variable
value
or

a ceramic

in

the

in

Regord

Outpur

the

of

through

was designed

at

these low

large

will

not

commonly

the

3.5 to 4 Mc.

the L

network into

8O-meter

merely

the

to

-COND"
to the

capacitor

for

this

capacitor,

transmitting

transmitter

rrgure

PHOTOGRAPH

THE
POWER

An LM

shovn

olongside

supply

ART-13

about

5 Mc.

which

would have

value

of capacitance

feed

used

band.

place

terminal

ground

may

may

be hooked

I I

SIMPLE LM

frequency

lor compoúson.

OF

SUPPIY.

mete'

the

The
the
signed

"L"

This

to feed

frequencies

satisfactorily

by

amateurs

beutd.

Hence

pi

a

network

The

a capacitor

on the left

terminal

be

used to

and

then a fixed

capacitor

is

power

output

AN/iRT-I3

to operate

network

is required
an

antenna

a verv

low

bui would.

ground.

to
the
for

it is desirable

when

simplest

of 100

on

determine

air

of

the

in place.

network

is

de-

as an

on freouen-

sincè the

installed

radiation

have

This

type

of an-

fixed-station

operat-

way

io do

end

pg.fd.

of

case.

the

the

best

to 4b0

the

capacitor

type

used

Experiment

of

a

to

A

76

Sunpr,us Reoro

CoNvrnsroN

showed that a value
feeding a folded
the 3.5-NIc. band.

Tests

of the completed
there is no appreciable increase
plate

current on
This represents a power input
volts

and the

per

75

current

tation,

160 ma.

Simple

and antenna coupling should

cent on

rvill

be

plate

of

A.C.

plate

of about

dipole with

transmitter have

circuit

bands.

180

is increased

efficiency runs from

The out-of-resonance plate

200

to

Supply for the

the 813

all

from

current is drawn

Power

Frequency

Figureq
supply
cy meters from the 115-volt
the frequency meter is obtained from
transformer

plate

low

resistance-capacitance filter has

a

90 and 91

for

operation of one of the LN,I

s'ith

current

LrsT

which dsto

on

"Surplus

illustrate

a.c.

a 6X5-GT
requirements

oF

is

Rodio

rectifier.

EQUTPMENT

given

Conversion

ppfd.

200

300-ohm twin line

in

200

of

with

ma.

by the

Meter

a very simple

line. Plate

of the frequency

been used

in

Volume I of

Monuol"

was

best for

shown that

output

be adjusted

Due to

after the

above 160

watts

at 1250

normal

813 tube.

series frequen-

voltage for

a

small

the very

on

the

on

ma.

70

exci-

until

LM

power

power

meter

the

plate
the values
plate
volts.
lator

change

position.

to

By
power
adequate heater
to the light load
voltage
conditions is

within

limit

use

insulated
ed from

tubes

are required

is

used

trations.

voltage

voltage
This voltage is

tubes to strike with

on the tubes

of a 6X5-GT rectifier,

in the frequency

on

supply.

of

supplied

in

strap

connecting
transformer in

applied

11.9 volts;

plus

the

from the

the same filament rvindings,

inside

with the

LtsT

whiéh

"Surplus

With ihe

resistance

the

the trvo filament

voltage

on

to the LNI

or minus 10 per

used in the

catlode,

power

oF

doto

Rodio

and capacitance

to the frequency

sufficient to

certainty

LM

is

adjusted

series it is possible

for

these two filament

this value

meter. No

the LM frequencv

supply shown in

EQUTPMENT

given

is

Conversion

transformer

meter

cause

the neon regu­when
to the 200-260-volt

windings

frequency

the

windings

under normal

of

voltase

cent

heatèr

equipment.

rvhich

has

the rectifier may

in

Volume

Through

the heater
rrùich

changes rvÉatever

meter rvhen

ll

Monuot"

shown

listed

is 255

the

voltage-

on

to

obtain

meter.

these illus-

of

Due

operating

is

well

voltage

well

be light-

lieht

the

and

the

the

the

the

the

it

BC-221 Frequency

Meter

BC-342 Receiver

BC-312

Receiver
BC-348 Receiver
BC-412 Rodor

TV

Receiver ond

Oscilloscope

Test

BC-ó45 Tronsmitter-Receiver

BC-9468 Receiver

SCR-274N

(BC-4534

(Conversion

(

SCR-274N

BC-4574 Series)

(Conversion

SCR-522

(BC-ó25)

(Conversion

to I

O-meters)

to

V.F.O.)

Tronsmitter

(Conversions

Oscilloscope)

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Series)

Receivers

Tronsmilters

2 meters)

SCR-522

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Receiver

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Trsnsceiver

TBY

BE-1034

Dynomotor

BC-10ó8A/t

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for

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meters)

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ARC-5

AN/APS-

ARC-5

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I 3 Tronsmitter-Receiver

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28

Mc.)

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to 420

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Selenium-Rectifier Power

ARC-5

V.H.F. Trqnsmitter-Receiver

GO-9ITBW Tronsmitter

BC-357 Morker Receiver

Copocity

BC-9468

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to

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BC-375 Tronsmitter

T A-l2B

Tronsmitter Conversion

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ond 28

Mc.)

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Light

AM-26 / AaC Interphone Amplifier

to 9-wqtt Amplifier)

Frequency

LM

Beom Rototing

Receiver

ARB

Meter

Mechonisms

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to

Mc.)

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to

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