Heathkit Q multiplier User manual

P I

......

®

r3:E.A.Tr3:K

I T

Q

MUL

TIPLIE

MODEL

GD-125

·,

TYPICAL

COMPONENT

TYP

S

This

chart

is

a guide to

commonly

used

types

of

elec-

tions

should

prove

helpful

in

identifying

most

parts

and

tr

onic c

omponents.

The

symbols

and

reading

the

schematic

diagrams.

RESISTOR

~

CAPAC

ITOR

W.

AJt,

...

-wwv-

~

--1

t--

A

~

POTENTIOME

~ER

o

~

(CONTROL)

;.--

---wvvr-

--

t

~

ELECTROLYT

IC m

CAPACITOR

--±1t=-

~W

~

.'.

~

P

L

A

T

E

g"

- - S U PP RE SS OR @

- - SCR EEN

- - GR ID

TUBE

'

CATH

OD E •

:.----

flLAM

EN

T

~

p

CO L L ECTOR

~

TR

AN

SISTOR

c-:

BASE EM ITT ER

~

C

OLLE

CT

OR

B

~

@

NPN

EM

ITTE

R •

..

,

.

~

NEON

BULB

FUSE

'

~.

:.

...

-;

..

'"

~

ILLUMINAT

(5;9NG

.

./

BULB

.,

/h

,I,' /

.

I,'

--------

-

SPST

SWITCH

(TOGGLE)

-

..-.r-

r

_

...-'

....

DPDT

-B-METER

W

R

E

C

T

I

F

I

E

~

. ....• .

(DIODE)

..-

:

)Y

~

CONDUCTORS

+

+-r

------

NO

T

CONNECTED

SHIELDED

CONNECTED

PHONE

JACK

EARTH

GROUND

~

PHO

NO

~

o-JACK

() ,

~

~'CROPHO

~

CHASSIS

GROUND

VARIABLE

~

CAPACITOR

---1t-

./

~

riI\

RECEPTACL

~E

.

" "..

/

~

\!!T

-

wt

1

,

LOOP

B

INDING

POST

TRANSFORMER

~

(

A

DJ US

TA

BL

E

POWDERED IRON

CORE) ARROW

tINDICATES DIR-

ECTION OF CORE

MOVE

MENT TO

INCREASE

IND

UCT

AN

C E

INDUCTOR

(COIL)

C POWER

[

T RANS-

FORMER

G-

T

ANTENNA

GENERAL

]

][

TRANSFORMER

(

ADJUSTABLE

CORE)

~

:

I I

PIEZOELECTR

IC

~D~

CRYSTAL

Assembly

a

nd

Operation

of

the

®#k~

Q

MULTIPL

IER

MOD

E L 6 0 - 1 2 5

H EA T H

COM

PANY,

BE

N T O N H A R B O R ,

MI

C H IG A N

TABLE

OF CONTENTS

In

tro

duction. • • • • • • • • • • • • • • • • • • 2

Pa

r ts List. • • • • • •

••

•••

• • • • • • • • 3

Step-

By-S

tep

As

se

mbl

y

Chas s is Asse

mbly.

• • • • • • • • • • • 4

Func

ti

on

Switc

h

Wiri

ng. • • • • • • • • 6

Insta

ll

a

ti

on. • • • • • • • • • • • • • • • • • • • 12

Alignment

. • • • • • • • • • • • • • • • • • • • • 13

Oper ation. • • • • • • • • • • • • • • • • • • • • 15

In Cas e Of

Dif

fic

ulty.

• • • • • • • • • • • • • 16

Specificatio

ns. • • • • • • • • • • • • • • • • • 16

Cir cu

it

Desc

r iption. • • • • • • • • • • •

••

17

Sche

ma

tic

•••••

(fo

ld

-

out

fro

m

pag

e). • • • 19

Ccpyri ghl " r965

Heath Compa ny

,

il

l ".(I.IJ .ru.tr,( 12

-17-65

Page

2

-

---

--------------'-

INTRODUCTION

The

Heathkit

Model

GD-125

Q

Multiplier

is

used

with

communications

receivers

to

provide

addi-

tional

selectivity

and

signal

rejection.

Because

its

peak

or

null

effect

can

be

tuned

across

the

receiver

IF

bandpass

,

the

operation

of

the

Q

Multiplier

is

more

flexible

than

that

of a

fixed

frequency

IF

filter.

The

Q

Multiplier

may

also

be

used

with

a

re-

ceiver

which

already

has

an

IF

filter,

to

obtain

two

simultaneous

functions.

For

example,

the

IF

filter

could

be

set

to

peak

the

desired

signal

and

the

Q

Multiplier

used

to

null

an

adjacent

signal.

When

properly

connected

and

adjusted,

the

Q

Multiplier

will

not

decrease

receiver

sensitivity.

In

the

peak

function

, an

audible

gain

will

be

noted

on CW

signals,

and

a

carrier

gain

will

be

noted

on

the

S

meter

for

phone

signals.

However,

the

audio

will

be

att

enuated

slightly

due

to

narrowing

of

the

received

sidebands.

The

reduced

sideband

reception

will

tend

to

attenuate

the

higher

audio

frequencies.

This

is

more

than

compensated

for

by

the

increased

readability

against

the

surrounding

QRM.

NOTE:

Refer

to

the

"Kit

Builders

Guide"

for

complete

information

on

unpacking

,

parts

identi-

fication,

tools,

wiring,

soldering,

and

step-by-

step

assembly

procedures.

Page

3

-~

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

-

PARTS

LIST

The

numbers

in

parentheses

are

keyed

to

the

numbers

on

the

Parts

Pictorial

(fold-out

from

Page

3).

The

instructions

in

the

Kit

Builders

Guide

show

you how to

identify

resistors

and

capacitors.

PART

PAR

TS

DESCRIPTION

PART

PARTS

DESCRIPTION

No.

Per

Kit

~

PerKit

RESISTORS

Hardware

(cont'd.]

(15)252-15

2

4-40

nut

1

/2

W

att

(16)

252-3

5

6-32

nut

j

(1)

1-9

1 1000 n

(brown-black-red)

/ (17)

252-7

3

Control

nut

1-

11 1 1500 n

(brown-green-red)

I (18)

252-9

1

Push-on

speednut

1-13

2 2700 n

(red-violet-red)

,V (19)

253-10

3

Control

flat

washer

1-1

9 1 5600 n

(gre

en-blue-red)

Jj (20)

254-9

6 #4

lockwasher

1- 23 1 27

Kn

(re

d-violet-orange)

(21)

254-1

7 #6

lockwasher

1-2

5 1

,j

47 Kn

(yellow-violet-orange)

/(22)

259-1

1 #6

solder

lug

1- 26 1 100 Kn

(brown-black-yellow)

.J(23)

254-4

2

Control

lockwasher

1-2

9 1 220

Kn

(red-red-yellow)

J (24)

259-10

1

Control

solder

lug

1-

37 2

2.2

megohm

(red-red-green)

J 25)

259-11

2

Spade

lug

WIRE

-SL

E

EVI

NG

1 Watt

89-1

1

Line

cord

/ /

(2) l A-7 1 47

Kn

(yellow-viOlet-orange)

.)

343-2

1

Coaxial

cable

'

344-59

1 Hookup

wire

V

346-1

1

Sleeving

V

MISCELLANEOUS

CAPACITORS 510 JlJlf

mica

J (26)57

-27

1

j'

S

il

icon

diod

, 750

rna,

(3)

20-42

1

20-53

1

.0011

ufd

mica

(1100

Jluf)

/ 5?0

PIV

. .

20-54

1 0033

ufd

mic

330 fJ.Jlf) / (27)

75-24

1

Lme

cord

stram

relIef

l/

:005

ufd

disc

/ (28)

205-254

1

Alignment

tool

blade

,/

(4)21-27

4

(5)

25-80

1

20-20

Jlfd

electrolytic

./

261-4

4

Rubber

feet

)

(6)26-28

1 100 u uf

variable

• J

411-26

1 12AX7

tube

/

' v (29)

412-13

1 Neon

lamp

(30)

431-51

1

2-lug

terminal

strip

v'/

(31)

431-55

1

6-lug

terminal

strip

,/

(32)

434-42

1

Phon

o

socket

V

(33)

434-56

1

9-pin

tube

socket

/

CONTROLS-S

W

ITCH-

TRANSFORMER-

OILS

(34)

438-4

2

Phono

plug

/ /

(7)

10-7

2 5000 n

control

.j

462-140

1 Knob

(large)

\I

(8) 63-288 1 4

-position

rotar

y

swit

ch

462-159

3 Knob

(small)

./

54-2 1

Power

transformer

.

.;

(35)

100-M357

1

Pointer

assembly

/

(9)40

-67

1

1.5

-

3.0

mh

coil

./

90-M331F

1

Cabinet

top

shell

V

(10)

40-68

1

120-150

uh

coil

../

90-M330P262

1

Cabinet

base

j

200-M453

1

Chassis

v

HARDWARE

490-5

1 Nut

starter

./

(11)

250-52

6

4-40

X 1

/4"

screw

331-6

Sold

er

J

(12)

250-89

5

6-32

x

3/8"

screw

597-308

1 Kit

Builders

Guide

v"

(13) 250

-155

4 #6

she

et

metal

screw

595-775

1

Manual

J

(14)

250-15

1

8-32

sets

crew

1

Identification

label

J

PARTS

PICTORIAL

CD

®®®

==€I:.l»=

-4I:IID=

~

~~~~

~

Y

®

CD

®® ®

~y

@ @

~

®

® ®@

~

Q) g

~+

r @

~

0

® 0

®

~>

C

'j:)

:>

':

';.:

."

..,

f'

®

~

.

..

'

~

;"

'"

a

4f

)

J

o o o

o

a

o

PI

CTORIAL 5

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

Page

4

STEP-BY-STEP

ASSEMBLY

Before

startin

g to

assemble

this

kit,

read

the

Kit

Builders

Guide

for

complete

information

on

wiring

,

soldering

,

and

Step-By-Step

Assembly

procedures.

CHASSIS

ASSEMBLY

Refer

to

Pictorial

1

for

the

following

steps.

( J

Locate

the

chassis

and

position

it

as

shown.

(

.I)

Refer

to

Detail

lA

and

mount

the

9-pin

tube

socket

at

VI

with

4-40

x

1/4"

screws,

#4

lockwashers,

and

4-40

nuts.

Position

the

blank

space

as

shown

by

the

arrow

on

Pictorial

1.

® 4- 40

NUT

@ @ # 4

LO

CKWASHER

@ 1,

1.

, J J

PICTORIAL

1

4-40xl/4"

SCREW

Detail lA

Locate

the

100

{L{Lf

variable

capacitor

and

clip

off lug 2

as

shown in

Detail

lB.

I

(

v)

Refer

to

Detail

1B

and

mount

the

100

{L{Lf

variable

capacitor

at

C with

four

4-40

x 1

/4"

screws

and

#4

lockwasher

s,

6'lJ(~....,11l,.-CUT

OFF

LUG

V A R I A B L E

CAP

A C I TO R

Detail 1B

Page

5

~

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

-

,

120-150

~H

COl

L

(# 40 - 6 81

Detail lC

(

.j

Refer

to Detail

lC

and

mount

the

120-150

fJ.h

coil

(#40-68)

at

A. Place

the

locating

tab

on

the

coil

mounting

clip

into

the

slot

in

the

mounting

hole.

Mount

the

1.5-

3.0

mh

coil

(#40-67)

at

D.

Re

fer

to

Pictorial

2

for

the

following

steps.

Connect

a .0011

ufd

(1100 fJ.fJ.f)

mica

ca-

pacitor

from

lug

1 of

coil

A (N8) to

ground

lug

B on

tube

socket

VI (N8).

Connect

a

.005

u

f'

d

disc

capacitor

from

lug

1 of

coil

D

(8-1)

to

ground

lug

C on

tube

socket

VI (N8).

/

(

\/

)

Connect

a 1500 n

(brown-green-red)

re-

sistor

from

lug

3

(8-1)

to

ground

lugC

(N8)

of

tube

socket

VI.

(V{

Connect

a

2.2

megohm

(red-re

d

-green)

re-

sistor

from

lug

2 (N8)

to

ground

lug C (8-3)

of

tube

socket

VI.

I

(,,/)

Connect

a

.005

fJ.fd

from

lug

2 of

coil

D

(N8) to lug 1 of

tube

socket

VI (N8).

Place

a 1-1/ 4"

length

of

sleeving

over

one

lead

of a .005

fJ.fd

capac

itor

.

Connect

this

lead

to

lug

2 of coil D (N8).

Leave

the

other

lead

free.

It

will

be connected

later.

/

Connect

a

1-1

/2"

wire

from

lug

6 of

tube

socket

VI

(8-1)

to

lug

1 of

variable

ca-

pacitor

C (N8).

1500

2.2

MEG

PI

CT

OR

IAL

2

(V )

Connect

a

1-1

/2"

wire

from

lug

1 of

var-

iable

capacitor

C (8-2)

to

lug 1 of

coil

A

(8-2).

/

)

Connect

one

end

of a

2-1

/4"

wire

to

lug

2

of

coil

A

(8-1).

Leave

the

other

end

free.

It

will

be

connected

later.

NOTE:

Where

a

wire

passes

through

a

connection

and

then

goes

to

another

point,

as

in

the

it

will

count

as

two

wires

in

the

solder

instruc-

tion

(8-2),

one

entering

and

one

leaving

the

con-

nection.

/

(v

/)

Place

one

lead

of a

2.2

megohm

(re

d-

red-

green)

resistor

through

ground

lug

A

(8-2),

through

lug 9

(8-2),

to

the

center

post

(8-1)

of

tube

socket

VI.

Connect

the

other

lead

to

lug

7 of VI (N8).

( )

Set

the

chassis

aside

temporarily.

Pag

____

e 6 ___

__

_____

----1

_

3 "

TH

E

PHYSI

CAL

POSITION

OF

THESE

LUG

S

2

.3

/4"

MA

Y A

PPEAR

DIFFERENT.

THEIR

PLA

CEMENT

DE

PENDS

UPON

THE

MANUFACTURER

.

!

USE

FULL

RE

SISTOR

LEAD

LENGTH

PICTORIAL 3

FUNCTION SWITCH WIRI G

Refer

to P

ictorial

3

for

the

foll

owing

steps.

( )

Position

the

4-position

rotary

switch

as

shown

in

Picto

r

ial

3.

(

/)

Connect

a 27

Kn

(red-violet-oran

ge)

re-

sistor

between

lu

gs

8 (8-1)

and

10 (N8) of

the

switch.

(

y{

Connect

one

end

of a

3"

wire

to

lug

10 of

the

switch

(8-2).

Leave

the

other

end

free.

It

will

be

connecte

d

later

.

Connect

a

2"

WIre etween

lugs

11 (N8) and

7 (N8) of

the

switch.

Refer

to

Detail

3A

and

prepare

a 220

Kn

(red-red-yellow)

resistor

and

.005

[.dd

disc

capacitor

combination.

Do

not

cut

eit

.r

resist

or

lead.

The

soldered

capacit

or

lead

should

be

cut

off

even

with

the

solder

connection,

J!ll

=

====

=

faJJi

~~~~

~

SO L D E R

Det

ail

3A

(j -Connect

the

lead

extending

from

the

pr e

pared

end

of

the

combination

to

lug

9 of the

s

witch

(8

-1).

Leave

the

other

leads

free.

Th

ey wi

ll

be

co

nn

ecte

d later .

(

-0

Connect

a 1-1/ 4" wir e

be

tween

lugs

6 (8-1)

and

4 (N8) of

the

swit

ch.

(0 Conne

ct

one

end

of a

2-

3/ 4"

wire

to lug 4

of t

he

switch

(8-

2).

Leave

the

othe

r end

fr

ee.

It

w

ill

be

connected

la

ter .

(

.;)

Conne

ct

one

end

of a 3" wir e

to

lu

g 5 of

th

e

sw

it

ch (8-1).

Leave

th

e other end

fr

ee.

It

will

be

connected

late

r .

Refer

to

Picto

r

ial

4

for

the

fo

llowing

steps.

(

v{

Refer

to

Detail

4A an d

install

the

Functio

n

sw

itc

h

at

E on the

chassis

with

a

contro

l

lo

ckwashe r

and

a

control

nut.

Position

the

lugs

as shown in Pictor ial 4.

Ti

ghten

the

nut

only

eno

ugh

to

hold

the

switch

in pla

ce

.

The

nut

will have

to

be

removed

late

r .

Detail 4A

(

\.)

Connect

the

free

end

of

the

wire

extending

from

lug

10 of

switch

E

to

lug

2 of

coil

D

(8-3)

•

(A

Connect

a 510

fJ.

fJ.f

mica

capacitor

from

lug

11 of

switch

E (N8)

to

lug 7 of

tube

socket

VI

(8-2).

(\.1

Connect

the

free

end

of

the

wire

extending

from

lug 2 of

coil

A

to

lu

g 7 of

switch

E

(N8).

Page

7

- - - -

--

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

PICTORIAL

4

(

Jconnect

a .0033

{lfd

(3300

{l{lf)

mica

ca-

pacitor

from

lug

7 of

switch

E (8-3) to

ground

lug

B on

tube

socket

VI

(8-2).

(

v{

Place

a

1"

length

of

sleeving

on one

lead

of

a 5600 n

(green-blue-red)

resistor.

Connect

this

lead

to

lug

3 of

switch

E

(8-1),

and

connect

the

other

lead

to

lug

8 of

tube

socket

/ "

(8-1).

(\/')

Connect

the

free

resistor

lead

of

the

re-

sistor-capacitor

combination

extending

from

lug

9 of

switch

E to

lug

1 of

tube

socket

VI

(8-2).

(

v)

Connect

the

free

capacitor

lead

of

this

combination

to

lug

2 of

tube

socket

VI

(8-2).

Use

sleeving

on

the

capacitor

lead.

/

(

......

)

Connect

one

end

of a

3"

wire

to

ground

lug

D on

tube

socket

VI

(8-1).

Leave

the

other

end

free.

It

will

be

connected

later.

( .)

set

the

chassis

aside

temporarily.

PUSH - ON

SPEEDNUT

Detail

SA

Refer

to

Pictorial

5

for

the

following

steps.

(

~

Position

the

cabinet

base

as

shown

in

Pic-

torial

5.

Refer

to

Detail

5A

and

install

the

neon

lamp

at

F.

Use

a

push-on

speednut,

I

( ..)

Refer

to

Detail

5B

and

mount

the

6-lugter-

minal

strip

at

L with a

6-32

x

3/8"

screw,

a #6

lockwasher,

a #6

solder

lug,

and

a

6-32

nut.

<;\

'~

l

t

~

li

~

!

ti\

lf

I

Jl

i

'

j

ii

(

;"

.t.

':

,.,

,,

,,,,,

Detail 58

- - -

------

--------

-

Page

8

Y E L DO

NOT

C U T

Detail 5C

B L K DO

NOT

CUT

BL

K

3-

3

/4"

/

) Cut

the

power tr ansfor mer

leads

to

the

length shown in Det

ail

5C. Measur e

each

le

ad fr om the point

where

it

leaves

the

tran

sfor m

er.

(

v{

Remove

1

/4"

of insul

ati

on fr om

the

end of

eac

h

power

tra

nsfor mer lead.

If

the

wires

are

not pr esold

er

ed, me

lt

a

sma

ll

amo

unt

of

so

lder on

each

bar ed lead end to hold the

/ w

ir

e

strands

toget

her.

(\.1) Mount the

power

tr

an

sformer

at

K, withthe

2-lug

vertica

l ter minal str ip on

the

mount-

ing

screw

at

J.

Use

6-32

x 3/ 8"

sc

rews, #6

lockw

ashers,

and

6-3

2 nuts

as

shown in

De

ta

il 5D.

Position

the

power

transformer

so

the

leads

are

as

shown in

Pictorial

5.

De

tail5D

REB

ENO

:';::-.:..

CO

N T RO L

~

~~

~

:\

~;

~'

I

i

r

~~

'. :;

:; ::

~:

~

::: :

.

:

..

::~.~.;

.(

.

:

,,:,:-

.:

-,\.y(?

Detail SE

(0

Plac

e a

con

tr ol s older lug on

the

bu

shin

g

of a 5000 Q contr ol. Rebend the

solder

lug

so that it

touche

s lug 3 of the

co

ntr

ol.

See

Detail 5E.

(/)

Refer

to De

tail

5E

and

mount th e 5000 Q

con

tro

l at G w

ith

the control

so

lder lug,

contr ol

flat

wa

sh

er

, and a

con

tro

l

nut.

Pos

iti

on the

so

lder lug and contr ol lugs

as

shown in

Pi

cto

rial

5.

C

.J

Mount a 5000 Q co

ntro

l at H with a

co

ntr ol

lockwas

her

, contr ol

fla

t washer , and a con-

tr ol nut. P os

it

ion the

contro

l

lugs

as

shown.

Refer to Detail 5F and mount the phono

soc

ket

at

M with 6- 32 x

3/

8"

screws,

#6

lockwashers,

and 6- 32 nut

s.

~



\

6 _ ] 2

.3

/

8"

SCREW

Detail SF

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

Page

9

Refer

to

Pictorial

6

for

the

foll

owing

steps.

(

l-

{

Connect

the

sh

ort

red

power

transformer

lead

to s

older

lug

N (NS).

(j C

onnect

the

sh

ort

yell

ow

power

transformer

lead

to

solder

lug

N (NS).

(

v(

Connect

the

sh

ort

black

power

transf

ormer

lead

to

lug

6 of

terminal

strip

L (NS).

(v(

Connect

the

remaining

red

power

trans-

former

lead

to

lug

3 of

terminal

strip

L

(NS).

(0

Connect

a 47 K

S1

(

yellow-vi

olet-oran

ge)

1

watt

resistor

from

lug

1 of

terminal

strip

L (NS) to

solder

lug

N (NS).

{ C

onnect

a

1000

S1

(brown-black-red)

re-

sistor

between

lugs

1 (NS)

and

2 (NS) of

terminal

strip

L.

(.j

Refer

to

Detail

6A

and

identify

the

cath

ode

(K)

lead

of

the

silicon

diode.

Connect

the

cathode

(K)

lead

of th e

diode

to

lug

2 (NS)

and

the

other

lead

to

lug

3 (S-2) of

ter-

minal

strip

L.

N

OTE:

WHEN

INSTALLING

SILICON

DIODES

,

THE

CATHODE

END

SHOULD

BE

PLAC

ED AS

DIRECTED

,

TH

E

CATH

OD E

END

IS

MARKED

WITH

EITHER

A

C O L O R

END

, C O L O R D

OT

. OR

COLOR

BAND

.

IN

THE

ILLU

STRATION

,

THE

SY M B O L K

CATHODE

END

,

COLOR

END

~

DOT\

~

Detail

6A

(

;)

Position

the

20-20

fJ.fd

I

NOI

CATE

S

THE

C O L O R

BAN

~

K

electr oly

ti

c

ca-

pacitor

so

it

does

not

ext

end

past

lug

2 of

terminal

strip

L,

as

shown

in

Pi

ctorial

6.

Place

a 1

/2"

len

gth

of

sl

eeving

on one

positive

(+)

lead

and

a

1"

length

of

sleevin

g

on

the

other

positive

(+)

lead.

C

onnect

the

(+) l

ead

with

1

/2"

of

sleeving

to

lug

2

(S-3),

and

the

oth

er

(+)

lead

to

lug

1 (NS) of

ter-

minal

strip

L.

/

(

oJ)

C

onnect

the

negative

(-)

lead

of

this

capac-

it

or

to

lug

4 of

terminal

strip

L (NS).

/

(

V)

Connect

either

neon

lamp

lead

to

solder

lug

N

(S-4).

Be

sure

all

four

leads

are

soldered.

(j

Place

a

1-1/2"

length

of

sleeving

over

the

other

ne on

lamp

lead

and

connect

this

lead

to

lug

5 of

terminal

strip

L

(NS).

(

~lace

a 3

/4"

length

of

sleevin

g

over

each

lead

of a 100

KS1

(br

own-black-yellow)

resistor.

Connect

this

resistor

between

lugs

1 (NS)

and

5

(S-2)

of

terminal

strip

L.

(v(

Connect

a

2-3

/4"

wire

from

lug 4 of

ter-

minal

strip

L (NS) to

the

solder

lug

on

control

G (NS).

('..{

Connect

a

1-1

/2"

wire

from

lug

4 of

ter-

minal

strip

L (S-3) to lug 2 of

ph

ono

socket

M (NS).

( ' Connect a

2-3/4"

wire

fr

om

the

solder

lug

on

control

G (S-3) to

lug

3 of

control

H

(S-l).

Be

sure

to

solder

the

solder

lug

to lu g 3

of

control

G.

(

.

~

Connect

a

2700

S1

(red-viol

et-red)

re-

sistor

from

lug

2 of

control

G

(S-l)

to

lug

1 of

terminal

strip

J (NS).

/

(

...

,1

)

Connect

a 2700

S1

(red-vi

olet-red)

resistor

from

lug

2 of

control

H

(S-l)

to

lug

2 of

terminal

strip

J (NS).

o o c

PIC

TORIAL 6

PICTORIAL 8

Page

10

Refer

to

Pictorial

7

for

the

following

steps.

(

;{

Check

the

chassis

and

switch

to be

sure

all

lugs

except

lug 11 of

switch

E

are

soldered.

/

)

Remove

the

control

nut

from

switch

E on

the

chassis.

(

;)

Refer

to

the

sequence

drawings

of

Pictorial

7

and

install

the

chassis

in

the

cabinet

base.

Secure

switch

E with a

control

flat

washer

and

a

control

nut.

Refer

to

Pictorial

8

for

the

following

steps.

I

(

.

~

)

Connect

the

free

end

of

the

wire

extending

from

lug

4 of

switch

E, to

lug

1 of

ter-

minal

strip

J

(8-2).

/

)

Connect

the

free

end of

the

wire

extending

from

lug

5 of

switch

E, to

lug

2 of

ter-

minal

strip

J

(8-2).

~

@'

~

~o

..

~~

CONTROL

FLAT

'X\!~~.-"Ir:

,,,

:

,

,,

:

·

:

·

i

,

:

"\

WASHER

CONTROL

NUT

~

@,

...

PICTORIAL 7

Page

11

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

(

J)

Place

the

remainin

g

yellow

power

trans-

former

lead

through

lug

4 (S-2) to lug 5

(S-I)

of

tube

socket

VI.

Place

a

1-1

/4"

length

of

sleeving

over

one

lead

of a 47

K51

(yellow-violet-orange)

re-

sistor.

C

onnect

this

lead

to lug 11 of

switch

E

(S-3).

/

(

\00

1

Connect

the

other

lead

of

this

resistor

to lug 1 of

terminal

strip

L

(S-5).

( )

Connect

the

free

lead

of

the

.005

ufd

disc

capacitor

extending

from

lug 2 of

coil

D,

to

lug

1 of

phono

socket

M (S

-I).

(

~

(

c

o

n n

e c

t

the

free

end of

the

wire

ext

ending

from

g

:r.

~

.)

\.!

·d

lug

D on

tube

socket

VI , to

lug

2 of phono

socket

M

(S-2).

Locate

the

line

cord

and

clip

2-1

/2"

from

one of

the

leads.

Remove

1

/4"

of

insulation

from

the

clipped

lead.

/

)

Twist

together

the

wire

strands

on

each

of

the

line

cord

leads.

Then

melt

a

small

amount

of

solder

on the

bared

ends

to

hold

the

wire

strands

together.

I

( \i )

Place

the

line

c

ord

through

hole

N,

and

con-

nect

the

short

line

c

ord

wire

to lug 6 of

ter-

minal

strip

L (S-2).

( I

Wrap

the

long

line

cord

lead

and

the

remain-

ing

black

transformer

lead

together.

Con-

nect

the

line

cord

lead

to

lug

12

(S-I)

and

the

black

transformer

lead

to

lug

13

(S-I)

of

switch

E.

---

DetaiI8A

~

r

( )

Refer

to

Detail

8A

and

install

the

line

cord

strain

relief

at

N.

(

!rnstall

the

12AX7 tube in

tube

socket

VI.

Refer

to

Pictorial

9

for

the

followin

g

steps.

( )

Turn

the

variabl

e

capacitor

shaft

until

the

plates

of the

capacitor

are

half

open.

(

..-

)

Locate

the

pointer

assembly

and

slide

the

pointer

assembly

ont

o

the

capacitor

shaft.

Start

an

8-32

setscrew

in

the

pointer

as-

sembly

bushing.

Position

the

pointer

at

the

/ 12

o'clock

position

and

ti

ghten

the

setscrew.

(

/)

Install

the

large

knob on

the

capacitor

shaft

and

tighten

the

setscrew.

)

/rnstall

the

remaining

knobs

so

that

the

point-

ers

are

as

shown in

Pictorial

9 when

the

Function

switch

and

control

shafts

ar

e

maximum

counterclockwise.

This

complet

es

the

wiring

of

your

kit.

Shake

out

all

wire

c

li

ppings

and

solder

splashes.

Be

sure

that

all

connections

are

properly

soldered.

Then

continue

with

the

Installation

section.

T

UN

IN G

N

OTCH

DE

P T H

PEAK

II

. . "

.@.,."

...

. .

.0

. . ..

',

.'

.

\€I.

. .::. . ®

00'

" Q M U LTI

PLIE

R

PICTORIA L 9

Pa

ge 12

-----------------'"~

I

NST

ALLATI

ON

CONNECTION TO THE REC

EIVER

To

put

the

Q

Multiplier

in oper ation, con

nec

t a

coax

ia

l c

able

between

your communi

ca

tions r

e-

ce

iver

and

the

ph

ono

s

ocket

on

the

r e

ar

of

the

Q

Multiplier.

Fi

gure

1A

shows

how to

inst

all

th e phono

plu

g on

the

c

oaxi

al

cable. C

onne

ct the

shield

of

this

ca

ble to

chassis

gr ound in

the

r

eceiver.

C

onne

ct

the

inn

er

le

ad

to the pl

ate

cir cuit of

the

mix

er

st

a

ge.

See

Fi

gur

e 1,

which

sh

ows

the

Q

Multiplier

con

nec

te

d in a

typi

c

al

mix

er

sta

g

e.

A phono so

ck

et

may be

install

ed on

the

rear

of y

our

re

ceiv

er

or

you

may

wish

to us e th e two

sp

ade lu

gs

suppli

ed

with

this

kit.

10 MULTl

PLIE

R I

PHONO SOCKET

e

COAXIAL CABLE

"

0"

MULTlP LIER

INPU T

( M A Y B E A

P HO NO

SOC

KE TI

r--

1 "-- j R E MO V E 1 "

OF

O UTE R

INS

ULATION.

SO L D ER S MOO T H TH E S H I E L D SO IT

" I C

LOS

EL

Y FI T S T O

THE

PH O NO

. ,

.

~

"

.

,

,.

"

.

,

...,

N E AT L Y

AS

SHO

WN A ND SO L D ER T H E

S

HIE

L D

TO

THE

P HO NO P L UG .

...

-~

~

:

...

-

:

-

:

-

~

-

:

.."

: ,

(

C O NN E C T O R . T R I M

\ 1

R E MO VE :

E X

CE

SS I C U T S H I E L D O

FF

L

-EV

ENLY

AR

OUND

PHONO

C O NN

ECT

O R

Figure lA

B+

ICOMMUNICATIONS RECE IVER I

Figure 1

The

connec

tio

n

fr

om

the

mix

er

pl

at

e to th e

inn

er

lead of th e coax

ia

l cab

le

sh

ould

be as

sh

ort

as

p

ossi

ble,

and

is

ol

ated

fr

om other r

ecei

v

er

cir-

cuits.

If

shielded

wire

is

used

for

the

conn

ecti

on

b

etw

e

en

the

coax

ia

l c

ab

le

and

the

mix

er

plate

,

th e

primar

y

windin

g of

the

first

IF

tr ansfor m er

sh

ould be r e

tune

d. (Retu

ne

the

transf

orm

er

b

e-

f

ore

att

achin

g

th

e Q

Multiplier

to th e r ec eive

r.

)

Thi

s

will

co

mpens

ate

f

or

the

ad

ditio

na

l ca

pac

-

itan

ce th e

shi

eld

ed

wir

e plac

es

a

cros

s

the

tr

ans-

form

er.

WARNING: Conn

ectin

g th e Q

Multipli

er

to an

AC

-DC

type of r e

ceiv

er,

pa

r tic ular ly

the

"hot

chassis"

type,

m

ay

m

ake

the

chassis

and

cabi-

n

et

of

the

Q

Multipli

er

"ho

t"

al

so

. To

av

oid

this

l

eth

al

sho

ck

haz

ard,

co

nnec t

the

leads

of an AC

v

oltm

eter

bet

wee

n the Q

Multipli

er

chas

sis

and

a good ear th g

ro

und.

If

a r e

adin

g of 117 v

olt

s

is

obtaine d,

rever

se

th

e

receiver's

pow

er

plu

g in

the p

ower

ou

tle

t. Th en ma

rk

the

plu

g and out -

let to

pol

ariz

e

them

for

futur

e

referen

ce.

Page

13

_ iL--------

--

------

--

-

ALIGN

MEN

T

( ) A

sm

all r ectangular

stee

l

blade

is

supplied

with th

is

kit.

Refer

to F

igure

2.

Then

use

long

-nose

pliers

to

inse

r t

this

blade

into

the

sma

ller

hole in

the

plasti

c nut

starte

r . When

insta

lled,

the

blade

end

should

be

flu

sh with

the

end of

the

nut

starte

r . Th

is

can

now

be

used

as

an a

lignment

too

l.

( )

For

best

results

,

the

receiver

IF

strip

should

be

in good

alignment

at

the

IF

frequency.

It

would

be well to

check

re-

ceiver

ali

gnment

before

procee

ding.

( )

If

the

receiver

does

not

have

an S mete r ,

it

is

re

commended

that

a vo

lt

meter be

con-

nected

between

its

AVC

line

and

ground.

This

meter

should

be

set

to a

negative

DC

r ange.

It

w

ill

then

act

as

an S

mete

r.

For

best

r esu

lt

s ,

this

meter

should

have

a

negative

DC

range

low

enough to

permit

a

center

scale

de

flection

of

the

meter when

t

he

receiver

is

t

uned

to a

station.

( )

Connect

the Q Mu

lt

ip

li

er

to

the

receiver.

Then,

with

the

Function

sw

it

ch in

the

OFF

position

,

tu

ne in a

steady

phone

signal

,

or

poss

ibly a

broadcast

st

ati on. Be

sure

that

the

signa

l

is

centered

in the IF

bandpass.

Th

is

can

be

noted

by the

greatest

S

meter

reading,

maxi

mum

audio

signal,

or

by a ma

xi

mum

reading

on

the

voltmeter

(AVe

vo

ltage

in

the

receiver).

Refer to

Figure

3

for

the

location

of

the

align-

ment

points.

( ) Place

the

cabinet

top

shell

upside

down on

the

top

of

the

cabinet

base.

This

w

ill

com

pensa

te

for

the

ca

pa

c

itance

added

when

the cab inet is inst

all

ed

la

ter .

CONVERTING

A

NUT

STARTER

TO

AN

ALIGNMENT

TOOL

INSERT

SMA

LL

METAL

BLADE

INTO

NUT

STARTER

Figure 2

( )

Tune

c

oil

L1 for

the

highest

S

mete

r r ead-

ing or loudest

signal

(or

maximum

negative

DC

reading

on

the

voltmete

r ). When

adjust-

ing

thi

s

coil,

you

will

no

tic

e

two

different

points

at

which a

pe

ak can be

obtained.

Use

the

pea

k obt

ained

with the co

il

slug

midway

in

the

co

il,

not

the

one

wher e the

slug

protrudes

fr om

the

bo

tt

om of the

coil

.

This

adjustmen

t

tunes

out

the

reactance

of

the

coaxial

cab

le

;

it

w

ill

not

have

to

be

changed

later.

CAB

IN

E T

TOP

S'H

ELL

Figure

3

_______________

__

---1

_

Page

14

( )

Rotate

the

NOTCH

DEPTH

and

PEAK

con-

trols

to

their

mid-point,

and

set

the

TUNING

knob

so

the

plates

of

the

tuning

capacit

or

are

50%

meshed.

Then,

rotate

the

Function

switch

to

the

NULL

position

and

all

ow

the

Q

Multiplier

to

warm

up.

Be

sure

there

are

no

components

overheating

before

contin-

uing.

NOTE:

The

is

criti

cal

;

there-

fore

,

it

is

recommended

that

the

pro

cedure

be

followed

carefully.

( ) Now

adjust

coil

L2

for

a

null

on

the

S

meter

or

minimum

signal

(or

for

the

smallest

amount

of

negative

DC

volta

ge on

the

v

olt-

meter).

This

null

will

be

extremely

sharp.

With a 455 kc

IF

,

it

will

occur

when

the

coil

screw

is

between

1

/8"

and

1

/4"

above

the

coil

mounting

frame.

Rock

the

adjustment

back

and

forth

over

this

point

several

times

to

make

sure

that

the

best

null

reading

is

obtained.

This

completes

the

Alignment.

Refer

to

Pictorial

10

for

the

following

steps.

( )

Install

a

rubber

foot

in

each

corner

of

the

cabinet

base.

CA B I N E T

TO P

SHELL

I

8RUBBER

F O

OT

I

8

PIC TORIAL 10

( )

Install

the

cabinet

top

shell

on

the

cabinet

base

with

four

#6

sheet

metal

screws.

( )

Carefully

peel

away

the

backin

g

paper

from

the

blue

and

white

identification

label.

Then

press

the

label

onto

the

rear

of

the

cabinet

base.

Be

sure

to

refer

to

the

numbers

on

this

label

in

any

communications

you

have

with

the

Heath

Company

about

this

kit.

Heathkit Q MULTIPLIER User manual

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