Hammarlund HQ-140-X Manuel

HQ-140-X

COMMUNICATIONS

RECEIVER

TECHNICAL DESCRIPTION &

OPERATING INSTRUCTIONS

460

West

34th

Street : : : :

New

York

ERRATA

For

all

HQ.140.X

receivers No.

299

and

below

the

following

change

should

made

the

schematic diagram, Fig.

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

the bottom of the

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

maintain

high

perform-

ance

characteristics

for

many

years

without

adjustment.

The

standard

cabinet

model

has

self-contained

stabilized

power

supply

operating

from

a 50-60 cps, 105-125

volt

source.

Frequency

coverage

continuously

tunable

from

540

(555

9.7

meters)

with

adequate

selectivity

separate

crowded

signals.

Full

use

the

receiver's

high

sensitivity

available

for

reception

even

the

weakest

stations

because

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

closely

adjacent

interfering

signals.

Band

spread

tuning

available

the

four

higher

frequency

ranges,

with

direct

calibration

for

the

80, 40, 20, 15,

and

meter

amateur

bands.

Calibration

charts

for

other

ranges

may

easily

made

for use

with

the

arbitrary

band-spread

logging scale.

While

this

receiver

was

designed

primarily

for

communications

use,

good

fidelity

music

and

voice

reproduction

both

the

standard

and

short

wave

broadcast

bands

provided.

Power

hum

is negligible.

Either

headphones

loudspeaker

may

used.

Automatic

volume

control

aids

keeping

music

and

voice

reception

the

desired

level.

[2)

When

you

are

interested

receIvmg

telegraph

code

signals,

you

will find

that

the

HQ-140-X

incorporates

unusually

stable

beat

fre-

quency

oscillator.

"5"

Meter

enables

you

obtain

accurate

reports

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

truly

professional-type

receiver,

the

ideal

instrument

for

operating

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

place.

Tubes

V4, V5, V6, V8,

V9,

VIO,

and

Vll

are

not

shielded.

Connect

the

permanent

magnet

dynamic

speaker

the

two

terminals

marked

SPEAKER

the

rear

the

receiver

chassis.

For

best

perform-

ance

not

place

speaker

top

receiver

cabinet.

The

antenna

may

then

connected

described

under

ANTENNA.

Basically, all

that

necessary

operate

radio

receiver

are

the

tuning

and

volume

controls.

The

additional

knohs

and

switches

found

pro-

fessional-type receiver

such

the

HQ-140-X

control

functions

which

greatly

improve

operating

performance.

The

receiver

"ON-OFF"

switch

the

AUDIO

GAIN

control.

you

are

unfamiliar

with

the

type

power

availahle,

check

with

the

local

power

company

hefore

plugging

receiver.

Turn

the

receiver

ad-

vancing

the

AUDIO

GAIN.

Check

see

that

the

pilot

lamps

light

and

tuhes

warm

up.

400

OHMS

ANT.

COMR

-C

6BA6

R.F.

AMPLIFIER

R48

6BE6

MIXER

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

'-------

.....

(Reg.)

'--_=

_________

....

SlO~S+~I~LTY

Fig.

2-Tuned

Amplifier

and

Mixer.

[3]

While

the

tubes

are

heating,

set

the

TUNING

RANGE

switch

the

.54·1.32 position,

MAN·A

VC·BFO

(automatic

volume control),

CRYSTAL

SELECTIVITY

OFF,

STANDBY·RECEIVE

RE·

CEIVE,

and

SENSITIVITY

"10".

Tune

the

broadcast

stations

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

which

you

are

listening.

The

ANTENNA

compensator

knob,

the

final

adjustment,

also should

set

for

greatest

meter

deflection.

When

automatic

volume control is

not

desired,

the

MAN·AVC·BFO

switch

can

set

MAN

(Manual),

the

AUDIO

GAIN

control

turned

fully clockwise,

and

the

SENSITIVITY

control employed

provide

the

desired volume.

When

headphones

are

plugged

into

the

jack

the

lower

right

hand

corner

the

panel,

the

speaker

is disconnected.

the

rear

the

chassis

are

two

jacks

marked

RELAY

which

can

connected

the

send·receive relay

the

transmitter

for

break·in

operation.

With

the

STANDBY·RECEIVE

switch

STANDBY,

the

receiver is silent

but

ready

for

instant

use.

The

BFO

(Beat

Frequency

Oscillator) control provides a wide choice

tones for

code operation.

Turning

the

MAN·A

VC·BFO

switch

BFO

disconnects

the

automatic

volume control,

and

the

SENSITIVITY

control

must

then

employed.

is often a

great

help

use

the

LIM.

ITER

short

wave reception.

The

PHASING

control normally is

set

the arrow in

the

center

its

scale,

but

may

adjusted

cut

out

interference from

stations

either

side

the

signal.

With

the

CRYSTAL

SELECTIVITY

switch

the

operator

can

choose

the

degree

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

YSTAL

SELECTIVITY

CRYSTAL

PHASING

CWTONE

STANDBY

·RECEIVE

LIMITER

ANTENNA

AUDIO

GAIN

SENSITIVITY

for

PHONE

AVC

OFF

Arrow

Inoperative

RECEIVE

As required

Peak

Signal

Adjust

[4]

for

CWor

CODE

BFO

OFF

Arrow

±2

RECEIVE

required

Peak

Signal

Adjust

Band

TUNING

RANGES

Frequency

.540-1.32

1.32-3.2

3.2

-5.7

5.7

-10

-18

-31

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

tune

standard

broadcast

station,

merely

necessary

tune

the

MAIN

TUNING

dial

the

desired frequency.

The

BAND

SPREAD

dial is

inoperative

the

first

two

ranges.

For

reception

short

wave

stations

with

the

MAIN

TUNING

dial

only,

is necessary

set

the

BAND

SPREAD

dial

100 in

order

attain

calibration

accuracy

better.

The

BAND

SPREAD

dial is

calibrated

directly

for

the

80, 40, 20, 15,

and

meter

amateur

bands.

make

use

this

feature,

set

the

MAIN

TUNING

dial

the

high

frequency

end

the

desired

amateur

band.

The

BAND

SPREAD

dial

then

may

tuned

over

the

range

selected.

For

higher

degree

accuracy

the

BAND

SPREAD

dial

may

set

the

exact

frequency

known

signal

and

the

MAIN

TUNING

dial

care-

fully

tuned

for

maximum

signal.

longer necessary

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

any

desired

ranges

which

are

not

directly

calibrated.

Again

the

MAIN

TUNING

dial

set

the

high

end

the

selected

range.

Turning

the

BAND

SPREAD

dial

from

100

tunes

the

receiver progressively lower

in frequency.

The

following

table

indicates

the

approximate

frequency

range

covered

the

BAND

SPREAD

dial

various

settings

the

MAIN

TUNING

dial, for

each

the

four

higher

frequency

bands

the

receiver.

Band

Low

End

Middle High

End

3.2-5.7

0.4

0.7

1.25

5.7-10

0.2

0.5

0.9

10-18

0.2

0.5

0.9

18-31

0.6

1.2

2.2

[5]

DESIGN

Symbol Type Tube Complement Function

6C4

Triode

Oscillator

6BA6

Remote

Cutoff

Pentode

Amplifier

6BE6

Pentogrid

Converter

Mixer

V4 6BA6

Remote

Cutoff

Pentode

1st

Amplifier

V5 6BA6

Remote

Cutoff

Pentode

2nd

Amplifier

V6 6BA6

Remote

Cutoff

Pentode

3rd

Amplifier

V7 6AL5

Twin

Diode

Detector,

AVC;

Noise

Limiter

V8 12AU7

Twin

Triode

1st

Amplifier;

BFO

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

amplifier

stage

plovide

the

neces-

sary

pre-selection

and

gain for

high

performance

and

rejection

unde-

sired

signals.

The

high

signal level

the

mixer

grid, V3,

contributes

favorable

signal

noise ratio.

Botb

grid

and

plate

circuits

the

stage

are

tuned;

individual

tuning

coils

are

selected for

each

band.

The

antenna

compensating

capacitor,

adjustable

from

the

front

panel,

permits

the

receiver

resonated

for

optimum

performance

with

the

antenna

use.

CONVERTER STAGE

high

degree

oscillator

stability

attained

the

use

separate

mixer

(6BE6),

V3,

and

independent

oscillator (6C4),

VI.

The

output

signal

from

amplifier, V2, is

heterodyned

with

the

output

the

local

high

frequency

oscillator,

VI,

and

electronically

com-

bined

within

the

mixer

tube,

V3.

thc

four

lower

frequency

ranges

the

local oscillator is 455

above

the

signal

frequency.

the

two

highest

ranges

the

oscillator is

4,55

below

the

signal

frequency.

Low-loss

tube

sockets,

ceramic

band

switches,

temperature

compen-

sating

capacitors,

zero

temperature

coefficient

ceramic

trimmers,

and

bi-metallic

compensating

plate

all

contribute

oscillator

stability.

Ad-

ditional

frequency

stability

attained

applying

regulated

voltage

the

oscillator

plate

and

the

rugged

construction

the

entire

oscillator

section

asscmbly.

[6]

C-

SELECTIVITY

Fig.

3-Crystal

Filter

Circuit. Fig.

4-H.

Tuning

Assembly.

CRYSTAL

FILTER

AND

PHASING

NETWORK

The

patented

Hammarlund

455

crystal

filter

and

phasing

network

controlled

from

the

HQ-140-X

front

panel.

Its

six-position

SELECTIV-

ITY

switch

includes

OFF

position

and

five

increasingly

selective

band-

widths.

Switch

positions

1, 2,

and

provide

progressively

sharper

crystal

selectivity

for use

phone

reception.

Positions

and

the

sharpest

selectivity

positions,

are

recommended

for reliable

code

reception.

Highest

fidelity is

obtained

the

OFF

position,

when

the

crystal

filter is

inoperative.

The

phasing

control

may

set

highly

attenuate

interfering

adjacent

signals.

With

experienced

operating

technique

the

crystal

filter offers

distinct

advantages

under

severe

interference

conditions.

AMPLIFIER

Nine

tuned

circuits,

three

stages

amplification

(V4, V5,

and

V6),

contribute

sensitivity

and

selectivity.

The

gain

per

stage

purposely

low

order

maintain

stability.

Iron

core

permeability-tuned

transformers

improve

performance

and

add

the

ease

adjustment.

The

intermediate

frequency

is 455

Kc,

the

RTMA

standard.

AVC

SYSTEM

Automatic

Volume

Control

minimizes

fading

and

signal

strength

variations

controlling

the

gain

the

stage

and

the

stages

and

V5. As a

result,

comfortable

and

constant

level

audio

main-

tained.

[7]

,,------FUSE

POWER

TRANSFORMER

3rd I F

-----1

FILTER

CAPACITOR

OUTPUT

TRANSFORMER

2nd I

t~----+1

TAL

FILTER

BFO

1st

_____

Z 1

Fig.

Top

view

showing

chassis

layout.

The

Automatic

Volume

Control

operative

only

when

the

MAN.

VC-BFO

switch

the

position.

With

VC,

greatest

signal-to-

noise

ratio

will

result

with

the

SENSITIVITY

control

set

maximum.

may

necessary

reduce

sensitivity

slightly

for

unusually

strong

signals.

"S"

METER

The

"S"

Tuning

Meter

provided

assist

tuning

and

give

indication

relative

signal

strength.

Because

the

meter

readings

are

proportional

voltage,

operative

only

when

the

MAN

-A

VC·

BFO

switch

the

position.

The

meter,

which

calibrated

over

S-9, is

factory

adjusted

that

a signal

input

approximately

microvolts

gives a

reading

S-9.

Each

"S"

unit

indicates

a 6

increase,

equivalent

doubling

signal

strength.

Should

meter

re-adjustment

necessary:

Set

front

panel

SENSITIVITY

control

"10"

and

CRYSTAL

SELECTIVITY

"OFF".

With

receiver

off,

mechanically

zero

pointer

with

a fine screw-

driver.

[8]

Fig.6

-BoLLom

view

showing

placement

parts.

With

the

and

the

1st

tube

V4 removed, zero

pointer

with

ZERO

ADJ

potentiometer

R-19.

With

Ave

and

V4 replaced,

adjust

meter

sensitivity

with

SENS

potentiometer

R-23.

SECOND

DETECTOR

AND

NOISE

LIMITER

One section

the

6AL5

tube

V7 is used for

the

second

detector

and

system.

This

system

produces a

minimum

distortion.

The

other

half

operates

as a series, self

adjusting

noise limiter.

It will reduce automobile ignition

and

other

types

impulse noise

minimum. Intelligibility is

not

affected

the

noise limiter,

although

may

switched off

desired.

BEAT

FREQUENCY

OSCILLATOR

The

Beat

Frequency

Oscillator, which employs one section

the

12AU7 (V8), is designed

provide

reception

unmodulated

code

signals.

The

TONE

control

permits

selection

the

desired

audio

tone.

Each

calibration

division represents

approximately

1000 cycles.

The

BFO

is only

operative

when

the

MAN

-AVe-BFO

switch is

the

BFO

position.

[9]

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