Hammarlund Hq-140-x Manual

HQ-140-X

COMMUNICATIONS

RECEIVER

TECHNICAL DESCRIPTION &

OPERATING INSTRUCTIONS

460

West

34th

Street : : : :

New

York

1,

N.

Y.

ERRATA

For

all

HQ.140.X

receivers No.

299

and

below

the

following

change

should

be

made

on

the

schematic diagram, Fig.

7.

The Line running up from R48 is connected to the top instead of

the bottom of the

S4

switch.

For

all

HQ.140·X

receivers No.

849

and

below

make

the

following change:

Resistor R35 is 820K ohms (Hammarlund

Part

No. 19309-103)

instead of 180K ohms on the schematic diagram, Fig. 7, and in the

Parts List, page 19.

For

all receivers

1099

and

below C25 is 4

mmf.

For

all receivers No.

1494

and below

make

the

following

change:

Item C68 is a ceramic trimmer, NPO, 1.5-7 mmf and carries part

number 23059.

Fig.

I-The

HQ-I40-X

Receiver.

INTRODUCTION

The

Hammarlund

HQ-140-X

is a

modern,

general

purpose,

super-

heterodyne

communications

receiver

designed

to

maintain

high

perform-

ance

characteristics

for

many

years

without

adjustment.

The

standard

cabinet

model

has

a

self-contained

stabilized

power

supply

operating

from

a 50-60 cps, 105-125

volt

AC

source.

Frequency

coverage

is

continuously

tunable

from

540

Kc

to

31

Mc

(555

to

9.7

meters)

with

adequate

selectivity

to

separate

crowded

signals.

Full

use

of

the

receiver's

high

sensitivity

is

available

for

reception

of

even

the

weakest

stations

because

of

inherently

high

signal-to-noise

ratio

and

the

superior

Hammarlund

noise limiter_

The

special

patented

Hammarlund

crystal

filter

provides

extreme

selectivity

for

the

high

attenuation

of

closely

adjacent

interfering

signals.

Band

spread

tuning

is

available

on

the

four

higher

frequency

ranges,

with

direct

calibration

for

the

80, 40, 20, 15,

and

10

meter

amateur

bands.

Calibration

charts

for

other

ranges

may

be

easily

made

for use

with

the

arbitrary

band-spread

logging scale.

While

this

receiver

was

designed

primarily

for

communications

use,

good

fidelity

of

music

and

voice

reproduction

in

both

the

standard

and

short

wave

broadcast

bands

is

provided.

Power

hum

is negligible.

Either

headphones

or

loudspeaker

may

be

used.

Automatic

volume

control

aids

in

keeping

music

and

voice

reception

at

the

desired

level.

[2)

When

you

are

interested

in

receIvmg

telegraph

or

code

signals,

you

will find

that

the

HQ-140-X

incorporates

an

unusually

stable

beat

fre-

quency

oscillator.

An

"5"

Meter

enables

you

to

obtain

accurate

reports

on

received

phone

signals while

the

Send-Receive

switch

and

relay

connec-

tions

permit

associated

transmitter

operation

without

interference.

Large,

comfortable

and

carefully

positioned

controls

make

the

HQ-

140-X

a

truly

professional-type

receiver,

the

ideal

instrument

for

operating

in

today's

crowded

short-wave

bands.

INSTALLATION AND OPERATION

Unpack

the

receiver

carefully.

Make

sure

that

the

fuse,

tubes,

asso-

ciated

tube

shields

and

pilot

lamps

are

in

place.

Tubes

V4, V5, V6, V8,

V9,

VIO,

and

Vll

are

not

shielded.

Connect

the

permanent

magnet

dynamic

speaker

to

the

two

terminals

marked

SPEAKER

on

the

rear

of

the

receiver

chassis.

For

best

perform-

ance

do

not

place

speaker

on

top

of

receiver

cabinet.

The

antenna

may

then

be

connected

as

described

under

ANTENNA.

Basically, all

that

is

necessary

to

operate

a

radio

receiver

are

the

tuning

and

volume

controls.

The

additional

knohs

and

switches

found

on

a

pro-

fessional-type receiver

such

as

the

HQ-140-X

control

functions

which

greatly

improve

operating

performance.

The

receiver

"ON-OFF"

switch

is

on

the

AUDIO

GAIN

control.

If

you

are

unfamiliar

with

the

type

of

power

availahle,

check

with

the

local

power

company

hefore

plugging

in

receiver.

Turn

on

the

receiver

by

ad-

vancing

the

AUDIO

GAIN.

Check

to

see

that

the

pilot

lamps

light

and

tuhes

warm

up.

400

l

UF

OHMS

1

\

~

ANT.

COMR

A

G

-C

6BA6

R.F.

AMPLIFIER

I

R48

6BE6

MIXER

'--...JVII"v---+

+B

I

'-------

.....

+B

(Reg.)

'--_=

_________

....

TO

SlO~S+~I~LTY

Fig.

2-Tuned

RF

Amplifier

and

Mixer.

[3]

While

the

tubes

are

heating,

set

the

TUNING

RANGE

switch

in

the

.54·1.32 position,

MAN·A

VC·BFO

on

A

VC

(automatic

volume control),

CRYSTAL

SELECTIVITY

on

OFF,

STANDBY·RECEIVE

on

RE·

CEIVE,

and

SENSITIVITY

on

"10".

Tune

in

the

broadcast

stations

by

using

the

MAIN

TUNING

dial

and

AUDIO

GAIN

control.

For

accurate

tuning

watch

the

"S"

meter.

Adjust

the

MAIN

TUNING

dial for

maximum

meter

reading for

the

station

to

which

you

are

listening.

The

ANTENNA

compensator

knob,

the

final

adjustment,

also should

be

set

for

greatest

meter

deflection.

When

automatic

volume control is

not

desired,

the

MAN·AVC·BFO

switch

can

be

set

on

MAN

(Manual),

the

AUDIO

GAIN

control

turned

fully clockwise,

and

the

SENSITIVITY

control employed

to

provide

the

desired volume.

When

headphones

are

plugged

into

the

jack

in

the

lower

right

hand

corner

of

the

panel,

the

speaker

is disconnected.

On

the

rear

of

the

chassis

are

two

jacks

marked

RELAY

which

can

be

connected

to

the

send·receive relay

of

the

transmitter

for

break·in

operation.

With

the

STANDBY·RECEIVE

switch

in

STANDBY,

the

receiver is silent

but

ready

for

instant

use.

The

BFO

(Beat

Frequency

Oscillator) control provides a wide choice

of

tones for

CW

code operation.

Turning

the

MAN·A

VC·BFO

switch

to

BFO

disconnects

the

automatic

volume control,

and

the

SENSITIVITY

control

must

then

be

employed.

It

is often a

great

help

to

use

the

LIM.

ITER

in

short

wave reception.

The

PHASING

control normally is

set

at

the arrow in

the

center

of

its

scale,

but

may

be

adjusted

to

cut

out

interference from

stations

on

either

side

of

the

signal.

With

the

CRYSTAL

SELECTIVITY

switch

the

operator

can

choose

the

degree

of

selectivity

that

provides

the

greatest

fidelity

with

minimum

interference.

The

first

three

positions are for

phone

reception

and

the

fifth

and

sixth for single signal code reception in ex·

tremely

crowded bands.

Set

controls as follows for initial operation:

CONTROL

MAN·A

VC·BFO

CR

YSTAL

SELECTIVITY

CRYSTAL

PHASING

CWTONE

STANDBY

·RECEIVE

LIMITER

ANTENNA

AUDIO

GAIN

SENSITIVITY

for

PHONE

AVC

OFF

At

Arrow

Inoperative

RECEIVE

As required

To

Peak

Signal

Adjust

10

[4]

for

CWor

CODE

BFO

OFF

At

Arrow

±2

RECEIVE

As

required

To

Peak

Signal

10

Adjust

Band

1

2

3

4

5

6

TUNING

RANGES

Frequency

.540-1.32

Mc

1.32-3.2

Mc

3.2

-5.7

Mc

5.7

-10

Mc

10

-18

Mc

18

-31

Mc

Meters

Wave Length

555

-227

227

-93.7

93.7-52.6

52.6-30.0

30.0-16.7

16.7-9.7

TUNING

PROCEDURE

To

tune

in

a

standard

broadcast

station,

it

is

merely

necessary

to

tune

the

MAIN

TUNING

dial

to

the

desired frequency.

The

BAND

SPREAD

dial is

inoperative

on

the

first

two

ranges.

For

reception

of

short

wave

stations

with

the

MAIN

TUNING

dial

only,

it

is necessary

to

set

the

BAND

SPREAD

dial

to

100 in

order

to

attain

a

calibration

accuracy

of

1%

or

better.

The

BAND

SPREAD

dial is

calibrated

directly

for

the

80, 40, 20, 15,

and

10

meter

amateur

bands.

To

make

use

of

this

feature,

set

the

MAIN

TUNING

dial

at

the

high

frequency

end

of

the

desired

amateur

band.

The

BAND

SPREAD

dial

then

may

be

tuned

over

the

range

selected.

For

a

higher

degree

of

accuracy

the

BAND

SPREAD

dial

may

be

set

to

the

exact

frequency

of

a

known

signal

and

the

MAIN

TUNING

dial

care-

fully

tuned

for

maximum

signal.

It

is

no

longer necessary

to

touch

the

MAIN

TUNING

dial,

and

the

BAND

SPREAD

calibratidn

will hold.

A 0-100

arbitrary

logging scale is also

providcd

for

band-spread

tuning

of

any

desired

ranges

which

are

not

directly

calibrated.

Again

the

MAIN

TUNING

dial

is

set

at

the

high

end

of

the

selected

range.

Turning

the

BAND

SPREAD

dial

from

100

to

0

tunes

the

receiver progressively lower

in frequency.

The

following

table

indicates

the

approximate

frequency

range

covered

by

the

BAND

SPREAD

dial

at

various

settings

of

the

MAIN

TUNING

dial, for

each

of

the

four

higher

frequency

bands

of

the

receiver.

Band

Low

End

Middle High

End

3.2-5.7

Mc

0.4

Mc

0.7

Mc

1.25

Me

5.7-10

Me

0.2

Mc

0.5

Me

0.9

Me

10-18

Me

0.2

Me

0.5

Me

0.9

Me

18-31

Me

0.6

Me

1.2

Me

2.2

Me

[5]

DESIGN

Symbol Type Tube Complement Function

VI

6C4

Triode

Oscillator

V2

6BA6

Remote

Cutoff

Pentode

RF

Amplifier

V3

6BE6

Pentogrid

Converter

Mixer

V4 6BA6

Remote

Cutoff

Pentode

1st

IF

Amplifier

V5 6BA6

Remote

Cutoff

Pentode

2nd

IF

Amplifier

V6 6BA6

Remote

Cutoff

Pentode

3rd

IF

Amplifier

V7 6AL5

Twin

Diode

Detector,

AVC;

Noise

Limiter

V8 12AU7

Twin

Triode

1st

AF

Amplifier;

BFO

V9

6V6GT/G

Beam

Power

Audio

Power

Output

VI0

OC3/VRI05

Voltage

Regulator

Voltage

Regulator

Vll

5U4G

Full

Wave

Rectifier Rectifier

PRE-SELECTION

The

antenna

input

coupling

and

RF

amplifier

stage

plovide

the

neces-

sary

pre-selection

and

gain for

high

performance

and

rejection

of

unde-

sired

signals.

The

high

signal level

at

the

mixer

grid, V3,

contributes

to

a

favorable

signal

to

noise ratio.

Botb

grid

and

plate

circuits

of

the

RF

stage

are

tuned;

individual

tuning

coils

are

selected for

each

band.

The

antenna

compensating

capacitor,

adjustable

from

the

front

panel,

permits

the

receiver

to

be

resonated

for

optimum

performance

with

the

antenna

in

use.

CONVERTER STAGE

A

high

degree

of

oscillator

stability

is

attained

by

the

use

of

a

separate

mixer

(6BE6),

V3,

and

an

independent

oscillator (6C4),

VI.

The

output

signal

from

RF

amplifier, V2, is

heterodyned

with

the

output

of

the

local

high

frequency

oscillator,

VI,

and

electronically

com-

bined

within

the

mixer

tube,

V3.

On

thc

four

lower

frequency

ranges

the

local oscillator is 455

Kc

above

the

signal

frequency.

On

the

two

highest

ranges

the

oscillator is

4,55

Kc

below

the

signal

frequency.

Low-loss

tube

sockets,

ceramic

band

switches,

temperature

compen-

sating

capacitors,

zero

temperature

coefficient

ceramic

trimmers,

and

a

bi-metallic

compensating

plate

all

contribute

to

oscillator

stability.

Ad-

ditional

frequency

stability

is

attained

by

applying

regulated

voltage

to

the

oscillator

plate

and

by

the

rugged

construction

of

the

entire

oscillator

section

asscmbly.

[6]

I

C-

SELECTIVITY

Fig.

3-Crystal

Filter

Circuit. Fig.

4-H.

F.

Tuning

Assembly.

CRYSTAL

FILTER

AND

PHASING

NETWORK

The

patented

Hammarlund

455

Kc

crystal

filter

and

phasing

network

is

controlled

from

the

HQ-140-X

front

panel.

Its

six-position

SELECTIV-

ITY

switch

includes

an

OFF

position

and

five

increasingly

selective

band-

widths.

Switch

positions

1, 2,

and

3

provide

progressively

sharper

crystal

selectivity

for use

in

phone

reception.

Positions

4

and

5,

the

sharpest

selectivity

positions,

are

recommended

for reliable

CW

or

code

reception.

Highest

fidelity is

obtained

in

the

OFF

position,

when

the

crystal

filter is

inoperative.

The

phasing

control

may

be

set

to

highly

attenuate

interfering

adjacent

signals.

With

experienced

operating

technique

the

crystal

filter offers

distinct

advantages

under

severe

interference

conditions.

IF

AMPLIFIER

Nine

tuned

circuits,

in

three

stages

of

IF

amplification

(V4, V5,

and

V6),

contribute

to

sensitivity

and

selectivity.

The

gain

per

stage

is

purposely

low

in

order

to

maintain

stability.

Iron

core

permeability-tuned

transformers

improve

performance

and

add

to

the

ease

of

adjustment.

The

intermediate

frequency

is 455

Kc,

the

RTMA

standard.

AVC

SYSTEM

Automatic

Volume

Control

minimizes

fading

and

signal

strength

variations

by

controlling

the

gain

of

the

RF

stage

V2

and

the

IF

stages

V4

and

V5. As a

result,

a

comfortable

and

constant

level

of

audio

is

main-

tained.

[7]

,,------FUSE

POWER

TRANSFORMER

T7

3rd I F

-----1

FILTER

CAPACITOR

Z3

OUTPUT

TRANSFORMER

T5

2nd I

t~----+1

X'

TAL

FILTER

Z2

BFO

Z5

1st

IF

_____

-'

Z 1

Fig.

5-

Top

view

showing

chassis

layout.

The

Automatic

Volume

Control

is

operative

only

when

the

MAN.

A

VC-BFO

switch

is

in

the

A

VC

position.

With

A

VC,

greatest

signal-to-

noise

ratio

will

result

with

the

SENSITIVITY

control

set

at

maximum.

It

may

be

necessary

to

reduce

sensitivity

slightly

for

unusually

strong

signals.

"S"

METER

The

"S"

or

Tuning

Meter

is

provided

to

assist

in

tuning

and

to

give

an

indication

of

relative

signal

strength.

Because

the

meter

readings

are

proportional

to

A

VC

voltage,

it

is

operative

only

when

the

MAN

-A

VC·

BFO

switch

is

in

the

A

VC

position.

The

meter,

which

is

calibrated

to

20

db

over

S-9, is

factory

adjusted

so

that

a signal

input

of

approximately

50

microvolts

gives a

reading

of

S-9.

Each

"S"

unit

indicates

a 6

db

increase,

equivalent

to

doubling

signal

strength.

Should

meter

re-adjustment

be

necessary:

1.

Set

front

panel

SENSITIVITY

control

to

"10"

and

CRYSTAL

SELECTIVITY

to

"OFF".

2.

With

receiver

off,

mechanically

zero

pointer

with

a fine screw-

driver.

[8]

Fig.6

-BoLLom

view

showing

placement

of

parts.

3.

With

the

A

ve

on

and

the

1st

IF

tube

V4 removed, zero

pointer

with

ZERO

ADJ

potentiometer

R-19.

4.

With

Ave

on

and

V4 replaced,

adjust

meter

sensitivity

with

SENS

potentiometer

R-23.

SECOND

DETECTOR

AND

NOISE

LIMITER

One section

of

the

6AL5

tube

V7 is used for

the

second

detector

and

A

ve

system.

This

system

produces a

minimum

of

distortion.

The

other

half

of

V7

operates

as a series, self

adjusting

noise limiter.

It will reduce automobile ignition

and

other

types

of

impulse noise

to

a

minimum. Intelligibility is

not

affected

by

the

noise limiter,

although

it

may

be

switched off

if

desired.

BEAT

FREQUENCY

OSCILLATOR

The

Beat

Frequency

Oscillator, which employs one section

of

the

12AU7 (V8), is designed

to

provide

reception

of

ew

or

unmodulated

code

signals.

The

ew

TONE

control

permits

selection

of

the

desired

audio

tone.

Each

calibration

division represents

approximately

1000 cycles.

The

BFO

is only

operative

when

the

MAN

-AVe-BFO

switch is

in

the

BFO

position.

[9]

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R.F.

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OF

THE

Fig.

7-Circuit

diag

9

o

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2200

R24

2200

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5

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m m

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ro~k=

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X

~~c.oc.o(Dc.olDc.o

r

_-+_S_5-<>I~F

0":

NOTES:

--'-WAVE

BAND

SWITCH

55

SHOWN

IN 18-31 Me.

POSITION. WAFERS NUMBERED FROM I

TO

6-

NO.

I

BEING CLOSEST

TO

FRONT.

Z-FIXED

RESISTORS ARE 1/2 WATT

UNLESS

MULT1PUCATION

BY

1000.

3-FIXED

CAPACITORS ARE IN

MICROMICRO~

FARADS(MMF)

WHEN

GIVEN

IN

WHOLE

NUMBERS,.

CAPACITORS SHOWN

IN

DECIMAL VALUES ARE IN

+--+=+-<>-0{

~

MICROFARADS(MFO.).ELECTROLYTICS ARE SHOWN

~-'

S5~IRo

0 OTHERWISE SPECIFIED. LETTER

"K

N INDICATES

:J

-

~\..J.J

N (X) ...J WITH PROPER

POLARITY

CONNECTIONS.

~~

f

~~J

>-----<f-b---;f

c~~~

c

-'~~

c

19:

'e

C72

I'-

~!"

u

t;#

.022

~

R:l

I~

r!

R52

2200

osc.

THE

HQ-140-X

RECEIVER

diagram.

u

[11]

115V.A.C.

AUDIO AMPLIFIER

The

first

audio

stage

is a

resistance

coupled

voltage

amplifier

using

the

other

section

of

the

I2AU7

(V8).

The

audio

output

stage,

a

6V6GT/G

beam

power

amplifier (V9)

provides

an

undistorted

output

of

at

least

2

watts.

The

output

transformer

impedance

is 6

ohms

to

match

the

voice coil

of

the

Hammarlund

or

other

suitable

permanent

magnet

speaker.

Thc

phone

jack

is

connected

across

the

voice coil

winding

and

silences

the

speaker

when

the

phone

plug

is

inserted.

POWER SUPPLY

Thc

self-contained,

stablized

power

supply

is designed

with

a

large

safety

factor

to

insure

reliable,

trouble-free

operation.

Humfree

perform-

ance

is

provided

by

a

two

section

filter.

High

voltage

is

supplied

by

the

SU4G

rectifier,

VII.

The

OC3/VRIOS

(VIO)

furnishes

regulated

voltage

to

the

variable

frequency

oscillator

VI

and

the

screen

grid

of

V2, V3, V4,

and

VS.

ANTENNA

The

HQ-I40-X

is designed for use

with

either

a single wire

or

balanced

type

of

antenna.

A

good

match

to

most

antenna

systems

will

be

obtained

because

of

the

receiver's

input

impedance,

nominally

400

ohms,

and

its

high

sensitivity.

For

general coverage

an

indoor

wire

of

20

to

SO

feet

will give

surpris-

ingly

good

reception.

A long single wire

outdoor

antenna

such

as

shown

in

Figure

8 will

generally

give

entirely

satisfactory

performance.

This

wire

may

be

SO

to

7S

feet

long.

For

best

reception

the

antenna

should

be

isolated

as

much

as possible

from

neighboring

objects.

Fig.

8-Antenna

suggestions.

(A) Single

Wire.

(B) 300

ohm

folded

di-pole.

[12]

Optimum

performance

on

a

particular

amateur

band

or

other

narrow

tuning

range

will

be

obtained

by

using a

half-wave

di-pole

or

folded di-

pole fed

with

300

ohm

or

suitable

lead-in

as shown

in

Figure

8E.

The

length

of

the

required

di-pole

may

be

calculated

by

the

following

formula:

468

Length

(feet)

=----

Freq.

(Mc)

A good

ground,

although

not

absolutely

necessary, will

frequently

aid

in

reception.

RE-ALIGNMENT PROCEDURE

A.

Equipment necessary

1.

Cathode-ray

oscilloscope (externally

synchronized

by

the

signal

generator.)

2.

Frequency

Modulated

(swept) signal

generator

(fairly

constant

output.)

3.

Output

Meter.

E.

IF

Amplifier

The

intermediate-frequency

transformers

are

iron-core

per-

meability-tuned,

and

resonated

with

fixed silver-mica

capacitors.

A

high

degree

of

stability

results,

which

should

make

IF

re-align-

ment

unnecessary

for a long

time.

Re-alignment

should

not

be

attempted

without

suitable

equipment.

RE:AR OF

CHASSIS

G)(i)O

000

: :

...

--TEST

FREQUENCIES FOR

I I

RF

'OSC.

ALIGNMENT

I I

~

'e'e

I

..

I

.,

I •

I

I'

I

I I I , I I

•

I\)I

U U

U U ::f U ::f ::f

::f::f

::f 0

o

,.,.

ANT.

RF

osc.

IIQ·110·"

",-[CUY".

C~.yU

AT

clTHAEMT

cAn'A,-

'CS!TlOMS

\II

1/1,

\\I

\\

II

VII

\

~\\

l\

1./

1

~

.I

i.1I

\ //W

II

/

.

f--

f-c-

.,

5~7

3.2

TO

10.0

5.7

Fig.

9-Left:

Diagram

for

tuning

IF

Amplifier,

RF

Stage

and

H.

F.

Oscillator.

[13]

"

1\

'I

l\

II.

1/

/

,,~

~/

Fig.

lO-Selectivity

Curves.

The

IF

transformers

must

be

tuned

for

symmetry

and

proper

coincidence

of

the

visible curves as well as for

amplitude

on

the

oscilloscope.

This

requires a stage-by-stage alignment,

starting

with

the

last

IF

transformer

(Z4)

and

continuing

back

through

the

first

IF

transformer

(ZI).

This

is

the

procedure:

(1)

Set

receiver as follows:

MAIN

TUNING

DIAL.

........

54

Mc

Bandswitch

(TUNING

RANGE)

..

54-1.32

Mc

STANDBy-RECEIVE

.........

RECEIVE

LIMITER.

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

..

OFF

MAN

-A

VC-B.FO. . . . . . . . . . . . .

..

MAN

CRYSTAL

SELECTIVITy

.....

OFF

(2)

With

the

generator

set

at

455

Kc

apply

signal to

the

grid

(pin

No.1)

of

the

3rd

IF

tube

(V6).

Adjust

the

two

in-

ductors

of

Z4

alternately

to

obtain

maximum

amplitude,

symmetry,

and

pattern

coincidence on

the

oscilloscope.

(3) Apply

the

signal

input

lead

to

the

grid (pin

No.1)

of

the

2nd

IF

tube

(V5).

Turn

the

two

adjustment

screws oJ

Z3

to

obtain

a symmetrical, coinciding

curve

with

as

much

amplitude

as possible

without

disturbing

the

pattern.

(4) Switch

the

signal

input

lead

to

the

grid (pin

No.1)

of

the

1st

IF

tube

(V4),

and

adjust

the

plate

inductor

(1'2)

ofthe

crystal

filter (Z2) for

maximum

amplitude

at

center

of

curve.

(5) Apply

the

signal

input

to

the

grid (pin

No.7)

of

the

6BE6

mixer

tube

(V3).

Adjust

screws

of

1st

IF

trans-

transformer

(ZI) as

in

(3).

This

should

result

in a tall

selectivity

curve

with

a slightly flattened peak.

(6)

Turn

CRYSTAL

SELECTIVITY

switch

to

position No.

1,

set

CRYSTAL

PHASING

pointer

on

arrow,

and

ad-

just

the

grid

inductor

(L2)

of

the

crystal

filter (Z2) for

maximum

amplitude

and

symmetry.

Adjust

signal

input

or

receiver

SENSITIVITY

control as required

to

prevenL

overloading.

(7) Switch

to

CRYSTAL

SELECTIVITY

position

No

2,

and

if

necessary,

move

PHASING

CONTROL

slightly

from

arrow

to

obtain

identical images.

Adjust

signal

generator

frequency

to

obtain

coincidence

of

the

images.

If

complete coincidence is

not

obtained,

alternately

make

slight

adjustments

of

the

PHASING

[14]

CONTROL

and

the

signal

generator

frequency,

until

images

coincide.

After

these

last

steps

have

determined

the

exact

fre-

quency

of

the

Quartz

crystal,

the

frequency

setting

of

the

signal

generator

should

be

left

undisturbed.

(8)

Repeat

carefully

the

complete

IF

alignment

.procedure

(steps

1

through

7) for

the

crystal

frequency.

C.

RF

Amplifier

The

RF

and

oscillator

stages

have

been

carefully

aligned

against

standard

crystals

at

the

factory

and

are

designed

to

hold

their

adjustments

over

a

long

period

of

time.

Re-alignment

should

not

be

attempted

unless

it

is

positive

that

re-adjustment

is necessary.

As

shown

on

the

chart,

Figure

9,

the

front

r~w

of

adjustments

control

the

H.

F.

oscillator

frequency

and

consequently

dial

calibration.

The

middle

row

of

adjustments

control

RF

alignment

and

the

rear

adjustments

are

for

antenna

alignment.

Here

is

the

procedure:

1.

Set

controls

as follows:

Receiver

STANDBY-RECEIVE

.........

RECEIVE

MAN

-A

VC-BFO.

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

..

MAN

CRYSTAL

SELECTIVITy

.....

OFF

BAND

SPREAD.

. . . . . . . . . . .

..

100

Bandswitch

(TUNING

RANGE)

..

54-1.32

Mc

MAIN

TUNING.

. . . . . . . . . . .

..

.60

Mc

Signal Generator

Frequency.

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

..

.60

Mc

Modulation.

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

..

Off

Each

band

is

adjusted

for

maximum

response

by

changing

the

inductance

at

the

low-frequency

end

and

the

capacitance

at

the

high-frequency

end.

These

adjustments

mutually

affect

each

other.

If

much

change

is

made

at

one

end

of

the

band,

the

other

end

of

the

band

must

also

be

re-adjusted.

This

procedure

is

repeated

until

dial

calibration

coincides

with

frequency

at

both

ends

of

the

band.

.

At

30

Mc

there

is

some

interaction

between

the

RF

and

oscillator

sections.

It

is

therefore

necessary

to

rock

the

MAIN

[15]

TUNING

dial

back

and

forth

while

adjusting

the

trimmer

capa-

citor,

in

order

to

avoid

a false setting.

2.

With

signal

generator

connected

to

the

receiver

ANTENNA

terminals,

and

output

meter

connected

to

the

SPEAKER

ter-

minals,

adjust

L17

until

maximum

deflection is

obtained

on

the

meter.

3.

Change

signal

generator

frequency

to

1.25

Mc

as

shown

in

Figure

9.

Set

MAIN

TUNING

dial

on

1.25

Mc

to

correspond.

Adjust

trimmer

capacitor

C73

to

tune

in signal,

and

C69

for

maximum

response.

4.

Set

signal

generator

to

1.4

Mc,

change

to

the

1.32-3.2

Mc

Band,

and

set

MAIN

TUNING

dial

on

1.4

Mc.

Adjust

LI8

until

signal

appears

and

L12

and

L6

for

maximum

response.

5.

Change

signal

generator

to

3

Mc,

and

set

MAIN

TUNING

dial

to

3

Mc

to

correspond.

Adjust

C64

to

tune

in

signal

and

C58

for

maximum

response.

In

like

manner

this

procedure

is followed for

each

band

and

should

be

repeated

until

calibration

and

tracking

are

as deaired.

MAINTENANCE

The

HQ-140-X

is designed

to

give

years

of

trouble-free

service

with-

out

need

for repairs.

Tube

failure is

the

most

common

source

of

trouble.

The

second

most

common

cause

of

difficulty is

component

failure

among

small

resistors

and

fixed capacitors.

The

following

chart,

Figure

11, gives

voltages

between

tube

socket

terminals

and

chassis. Below

each

voltage,

in

parenthesis,

is shown

the

meter

scale

required

for checking

with

a

voltmeter

having

a

sensitivity

of

1000

ohms

per

volt

or

better.

Slight

variations

from

voltages

indicated

may

be

disregarded.

With

the

aid

of

the

chart

and

the

schematic

diagram,

defective com-

ponents

can

usually

be

located.

The

parts

list

in

the

back

of

this

manual

gives

values

and

Hammarlund

part

numbers.

Standard

items

may

be

purchased

locally.

Non-standard

components

are

available

on

order

from

the

factory.

A delicate

communications

receiver

should

be

entrusted

only

to

a

qualified

technician.

Should

difficulty

be

experienced,

please

write

the

company

for

advice

or

to

arrange

for

factory

service.

[16]

LINE

VOLTAGE

117

V.A.C.

Limiter-off

SENSITIVITY AND AUDIO

AT

MAX.,

NO

SIGNAL

Man. Position Receive Position

I

MAN-AVC-BFO

SWITCH

I POSITION

iAVCiBFO

-II

RF I Mixer I

1

6BA6

6BE6

OSC

IF IF IF

A

VC

Out- Recti- Reg.

Audio

BFO

I

IBt

I

2nd

I 3rd I

Det·1

I I

VOlt·IIBt

I

6C4

AMP AMP AMP Limiter put

fier

OC3/

72 72

6BA6

6AL5

6V6GT

5U4G

VRI05

12A

U7

12AU7

Pin 1

II

1

92

I I I

-0.21

I 1

P;J~t

I

75

to ground

.....

_

..

_.

___

..

_._

(300)

_

..

_.

___

..

_._._

..

_._~_

..

_.

___

..

_._

(i~~)

~

....

Pin 2 1.1

3.5

1.5 2.3

-0.41

298

1

to

ground. .

... ...

(3)

...

(6)

(3)

(12)

...

(300)

..

.

...

. .

...

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

Pin 3 6.2 6.2 6.2 6.2 6.2 6.2 6.2

256

106

2.3

to

ground. . .

..

A.C. A.C. A.C. A.C.

A.C. A.C.

A.C.

(300)

...

(300)

(3)

Pin 4

to ground

.....

273

280

(300)

A.C.

6.2

A.C.

-----1------------------

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

Pin 6

100

92

100 100

110

In

ground. . . . .

(300) (300)

(300)

(300) (300)

Tie

Point

280

210

A.C.

75

(300)

-----1-----------------------------------

Pin 7

3.6 3.5

3.1 2.3

-0.2

6.2

106

-13

to

ground. . .

..

(6)

...

.. .

(6)

(3)

(12)

A.C.

..

.

(300)

. . ..

(60)

I

~ngr~und

.....

-

..

-.-1-.

·-·-1-·

.-.-

--.

·-·-1-·

.-.-

--.

·-·-IJr

~--

----

SCHEMATIC

DESIGNATION

Cl,A-F

C2,

A-I

C3, 4, 5

C6

C7,

8,

9

CI0

Cll

C12, 13, 14, 15

C16

C17, 18

C19

C20

C21

C22,

23,24

C25

C26

PARTS LIST HQ.140.X

DESCRIPTION

CAPACITORS

Main

Tuning,

va~iable

..........

(Part

of

20840-Gl)

Band

Spread,

variable

..........

(Part

of

20840-G

I)

Ceramic disc,

_0221J.f

W_V.D.C

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

.

Silver mica, 50

IJ.lJ.f

500

W.V.D.C

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

.

Ceramic disc, .022

IJ.f

W.V.D.C

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

.

Silver mica, 240

IJ.lJ.f

500

W.V.D.C.

(Part

of

ZI,

I.F.

transformer

assembly

iii

26121)

..

Silver mica, 260

IJ.lJ.f

500

W.V.D.C.

(Part

of

ZI,

I.F.

transformer

assembly

iii

26121)

..

Ceramic disc, .022

IJ.f

W.V.D.C

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

.

Silver mica, 220

IJ.lJ.f

500

W.V.D.C.

(Part

of

Z2,

Crystal

Filter

Assembly

iii

26125)

.....

.

Silver mica, 100

1J.[J.f

500

W.V.D.C.

(Part

of

Z2,

Crystal

Filter

Assembly

iii

26125)

.....

.

Cry-stal

phasing

variable,

(part

of

Z2,

Crystal

Filter

Assembly !il26125)

.....

.

Silver mica, 270

1J.[J.f

500

W.V.D.C.

(Part

of

Z2,

Crystal

Filter

Assembly !il26125)

.....

.

Silver mica, 100

1J.[J.f

500

W.V.D.C

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

.

(Part

of

Z2,

Crystal

Filter

Assembly !il26125)

.....

.

Ceramic disc, .022

[J.f

W.V.D.C

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

.

Ceramic,

NPO

1.5

IJ.lJ.f

500

W.V.D.C

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

.

Silver mica, 240

'1J.[J.f

500

W.V.D.C.

(Part

of

Z3,

I.F.

transformer

assembly !il26123)

.....

[17]

HAMMARLUND

PART

No_

23034·24

23071·5

23034·24

23071·56

23003·112

23034·24

23071·55

23003·94

11776·Gl

23003-104

23003·94

23034-24

23023·107

CK

23071-56

SCHEMATIC

DESIGNATIOi'i

C27

C28,29,30,31.32

C33,34

C3S, 36, 37

C38

C39

C40

C41

C42

C43

C44

C4S

C46

C47

C48

C49

CSO

CSI

CS2

CS3,S4

CSS

CS6

CS7

CS8, S9, 60

C61

C62

C63

C64,6S

C66,67

C68

C69

C70

C71

C72

C73

C74

Fl

Jl

J2

El

E2

Ll

L2

L4

LS

L6

L7

L8

PARTS LIST

HQ.140.X-Cont.

DESCRIPTION

CAPACITORS-Continued

Silver mica, 260

{J.{J.f

SOO

W.V.D.C.

(Part

of

Z3,

I.F.

transformer

assembly jji26123)

...

.

Ceramic

disc, .022

{J.{J.f

W.V.D.C

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

.

Silver mica,

9S

{J.{J.f

SOO

W.V.D.C.

(Part

of

Z4,

Final

I.F.

transformer

assembly

jji

26112)

Mica,

100

{J.{J.f

SOO

W.V.D.C

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

.

Paper

tubular,

.OS

{J.f

600

W.V.D.C

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

.

Paper

tubular,

.01

{J.f

400

W.V.D.C

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

.

Ceramic disc, .022

{J.f

W.V.D.C

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

.

Silver mica, S

{J.{J.f

SOO

W.V.D.C

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

.

Silver mica, 240

{J.{J.f

SOO

W.V.D.C.

(Part

of

ZS,

B.F.O.

Assembly

jji261OS)

...........

.

B.F.O.

variable,

(Part

of

ZS,

B.F.O.

Assembly

jji

2610S)

...........

.

Silver

mica,

220

{J.{J.f

SOO

W.V.D.C.

(Part

of

ZS,

B.F.O.

Assembly jji2610S)

...........

.

Paper

tubular,

.OS

{J.f

600

W.V.D.C

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

.

Ceramic disc, .022

{J.f

W.V.D.C

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

.

Mica, 300

{J.{J.f

SOO

W.V.D.C

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

.

Electrolytic, 10

{J.f

ISO

W.V.D.C

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

.

Paper

tubular,

.OS

{J.f

600

W.V.D.C

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

.

Mica, 620

{J.{J.f

SOO

W.V.D.C.

(Part

of

R.F.

Unit

Assembly

jji

26131)

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

.

Ceramic,

NPO

8

{J.{J.f

SOO

W.V.D.C.

(Part

of

II.F.

Oscillator

Unit

Assembly

jji

26143)

...

.

Electrolytic,

10-S00V, 20-4S0V, 20-4S0V

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

.

Ceramic disc, .022

[J.f

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

.

Mica, 620

[J.[J.f,

SOO

W.V.D.C

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

.

Antenna

Compensator,

variable

(Part

of

Main

Tuning

Unit

jji20840-Gl)

..........

.

Mica, S100

[J.[J.f

SOO

W.V.D.C

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

.

Trimmer,

mica 3-3S

[J.{J.f.

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

.

Trimmer,

mica 1.S-9

[J.{J.£.

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

.

Trimmer,

mica 3-3S

[J.{J.f.

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

.

Trimmer,

mica 1.S-9

{J.[J.£.

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

.

Trimmer,

mica 3-3S

[J.IJ.f.

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

.

Trimmer,

ceramic

NPO

1.S-7

[J.IJ.f.

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

.

Trimmer,

ceramic

NPO

3-12

[J.[J.f

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

.

Trimmer,

mica

1.S-9

[J.[J.f

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

.

Silver mica 673

IJ.[J.f

SOO

W.V.D.C

•..................

Silver mica 300

IJ.lJ.f

SOO

W.V.D.C

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

.

Ceramic disc., .022

W.V.D.C

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

.

Mica,

IS00

[J.{J.f

SOO

W.V.D.C

.......

,

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

.

Mica, 1000

[J.[J.f

SOO

W.V.D.C

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

.

Fuse,2

ampere

type

3AG

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

.

Phone

jack

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

.

Relay

jack

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

.

Antenna

terminal

strip

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

.

Speaker

terminal

strip.

. .

..

.

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

.

COILS

R.F.

choke

(CII-X)

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

.

Crystal

Filler

grid coil,

(Part

of

Z2,

Crystal

Filter

Assembly jji2612S-GI)

..

.

Filter

choke

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

.

Antenna

coil assembly

.S4-1.32

mc

range

..........

.

Antenna

Coil Assembly

1.32-3.2

mc

range

.........

.

Antenna

Coil

3.2-S.7

mc range

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

:

Antenna

Coil

S.7-10

mc

range

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

.

[18]

HAMMARLUNO

PART

No.

23003-1]2

23034-24

23071-62

23001-48

23912-2

239]2-23

23034-24

23002-1

2307]

-S6

1173S-G42

23071-SS

23912-2

23034-24

23001-7S

23073-71

23912-2

2300S-86

23023-22

CH

ISS04-6]

23034-24

2300S-86

SA-617

2301S-16B

16089-2

16089-1

16089-2

16089-1

16089-2

230S9-1

230S9-2

16089-1

23004-2

23003-]

OS

23034-24

2301S-20

2301S-40

IS928-7

6087

6142

6088

3843

609-Gl

31068-Gl

26111·1

260S1-Gl

260S1-G2

6013

6016

SCHEMATIC

DESIGNATION

L9

LlO

Lll

Ll2

Ll3

Ll4

Ll5

Ll6

Ll7

L18

Ll9

L20

L21

L22

Ml

PLl,2

Rl

R2

R3

R4

R5

R6

R7

R8,9

RIO

Rll

R12

R13

R14

R15

R16

R17

R18

R19

R20

R21,22

R23

R24

R25

R26

R27

R28

R29

R30, 31

R32

R33

R34

R35

R36

R37

R38

R39

R40

R41

PARTS LIST

HQ.140.X-Cont.

DESCRIPTIO:"lo"

COILS-Continued

,

HAMMARLUND

PART

No.

Antenna

Co~l

10-18

me

range

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

1

Antenna

Cod

18-31

me

range

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

:

R.F.

Coil Assembly

.54-1.32

me

range

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

:

R.F.

Coil Assembly

1.32-3.2

me

range

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

:

R.F.

Coil Assembly

3.2-5.7

me

range

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

'

R.F.

Co~l

Assembly

5.7-10

me

range

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

i

R.F.

CoIl Assembly

10-18

me

range

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

.

R.F.

Coil Assembly

18-31

me

range

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

'

H.F.

Ose. Coil Assembly

.54--1.32

me

range

.........

.

H.F.

Ose. Coil Assembly

1.32-3.2

me

range

........

.

H.F.

Ose. Coil Assembly

3.2-5.7

me

range

.........

.

H.F.

Ose. Coil Assembly

5.7-10

me

range

..........

.

H.F.

Ose. Coil Assembly

10-18

me

range

..........

.

H.F.

Ose. Coil Assembly

18-31

me

range

...........

1

Carrier

Level

("S")

meter

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

!

6019

6022

26047-G2

26047-G1

26047-G6

26047-G5

26047-G4

26047-G3

26030-G2

26030-Gl

26030-G6

26030-G5

26030-G4

26030-G3

26149-Gl

Pilot

Lamp

No. 47, 6.3 V., .15

amp...

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

.•

16004-1

RESISTORS

I

22

Ohms

72

W

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

i

47,000 Ohms,

72

W

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

'

2,200 Ohms,

72

W

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

'1

1

100,000 Ohms,

72

W

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

.

10,000 Ohms,

72

w

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

.

100,000 Ohms,

72

W

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

.

150 Ohms,

72

W

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

.

2,200 Ohms,

72

w

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

.

10,000 Ohms,

72

w

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

.

2,200 Ohms,

72

W

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

.

2,200 Ohms,

72

W.

2,2Woagh~~2~

C¥~t.a.l.~~l~~~

~s.s~~~l.~

.

~

~~~~~~:

: : : : :

300 Ohms,

72

w

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

.

51 Ohms,

72

w

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

,

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

.

22 Ohms,

72

w

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

.

470,000 Ohms,

72

W

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

.

10,000 Ohms,

72

w

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

.

Potentiometer,

300

Ohms

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

.

270 Ohms,

72

w

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

.

2,200 Ohms,

72

W

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

.

Potentiometer,

1500 Ohms

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

.

2,200

Ohms,

Y2

w

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

.

33,000 Ohms, I W

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

.

47,000 Ohms,

72

W.

(Part

of

Z4,

LF.

Transformer

Assembly jji26113)

....

.

2,200 Ohms,

72

W

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

.

240 Ohms,

72

W

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

.

47,000 Ohms,

72

W

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

.

270,000 Ohms,

72

W

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

.

1

Meg

Ohms,

72

W

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

.

2.2

Meg

Ohms,

72

W

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

.

820,000 Ohms,

72

W

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

.

180,000 Ohms,

72

W

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

.

Potentiometer

250,000

Ohms

(switch

attached)

......

.

1,000 Ohms,

72

W

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

.

62,000 Ohms, 1 W

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

.

Potentiometer,

10,000 Ohms

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

.

240 Ohms,

72

W

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

.

33,000 Ohms,

72

W.

19309-9

19309-89

19309-57

19309-97

19309-73

19309-97

19309-259

19309-57

19309·73

19309-57

19309-202

19309-193

19309-9

19309-113

19309-73

15368-1

19309-262

19309-57

15368-2

19309-57

19310-293

19309-89

19309-57

19309-201

19309-89

19309-107

19309-121

19309-129

19309-119

19309-103

6095

19309-49

19310-231

15367-1

19309-201

(Part

of

Z5,

B.F.O.

Assemblv jji26107)

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

· 19309·85

[19]

Hammarlund HQ-140-X Manual

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