Hammarlund HQ-100A User Manual

\

~,

"',

'\

\

'\

\

\

\

\

I(

. \

jt

//

//

I::

AND

.-

O~.RATING

l

I

INSTRUCTIONS

D.SCRI.-TION

----~---

I

HQ-IO

A

(

COMMUNICATIONS

»

\.

RECEIVER

~

\

\

~

Hammarlund Manufaduring Company

A Giannini Scientific Co.

73-88

HAMMARLUND

DRIVE

MARS

HILL.

NORTH

CAROLINA

9001-06-00005

FREE DOWNLOAD

COURTESY OF N9SOR

WWW.HAMMARLUND.ORG

THE

HQ-IOOA

SERIES

COMMUNICATIONS

RECEIVERS

INSTRUCTION

AND

SERVICE

INFORMATION

ESTABUSHED

19]0

ISSUE

3

1r1

order

to

receive the

full

unconditional

gO-day

warranty against

defective material

arJd

workmanship in this receiver, the warranty

card must

be

filled

out and mailed

within

two weeks

of

purchase.

Please

refer

to

serial number of warranty in correspondence.

THE

HAMMARLUND MANUFACTURING CO.

73-88

Harnrnarlund

Drive

Mars

Hill,

North

Carolina

28754

II

I

FREE DOWNLOAD

COURTESY OF N9SOR

WWW.HAMMARLUND.ORG

@

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

..-

Figure

I.

Tbe

HQ·IOOA

Receiver

TUBE

AND

DIODE

COMPLEMENT

Symbol

Type Tube

Function

VI

6BZ6

Pentode

RF

Amplifier

V2

6BE6

Pentagrid

Converter

Mixer

V3

6C4

Triode

HF

Os

cillator

V4A

1!212AX7

Triode

First

AF

Amplifier

V4B

1!212AX7

Triode

Q-Multiplier

V5

6BA6

Remote

Cutoff

Pentode

First

IF

Amplifier

v6

6BA6

Remote

Cutoff

Pentode

Second

IF

Amplifier

V7

6BV8

Twin

Diode,

Triode

Detector,

Serie s Nois e Limiter,

BFO

V8

6AQ5

Beam

Power

Amplifier

Audio

Power

Output

V9

OB2

Gas

Filled

Diode

Voltage

Regulator

CRI

Cer

72c

Diode,

Silicon

Rectifier

CR2

Cer

72c

Diode,

Silicon

Rectifier

ii

FREE DOWNLOAD

COURTESY OF N9SOR

WWW.HAMMARLUND.ORG

INTRODUCTION

The

Hammarlund

HQ-l

OOA

is

an

all-new

communications

receive

r

representing

entirely

new

concepts

in

electrical

and

mechanical

design.

It

will

provide

years

of

top

performance

with

minimum

maintenance.

The

HQ-100A

series

receivers

have a self-contained

power

supply

and

a

universal

transformer

capable

of

operation

from a 117

volt

60

cp/s

or

220/230

volt

50/60

cp/s

source,

provided

the

proper

adapter

plug

(P2)

is

installed.

The

HQ-lOOA

is a superheterodyne

receiver

with a frequency

cover-

age

continuously

tunable

from

540

KCS

to

30

MCS

with

extremely

fine

control

in

separation

of

crowded

signals.

A

very

high

signal-to-noise

ratio

plus

the

famous

Hammarlund

noise

limiter

circuit,

permits

full

use

of

the

receiver's

excellent

sensitivity

on

the

weakest

signals.

A

Q-Multiplier

is

provided

for

varying

the

selectivity

of

the

receiver.

Red

segments

on

the

main

tuning

dial

indicate

wherein

the

majority

of

the

international

short

wave

stations

can

be

located.

Electrical

band

spread

tuning

is

provided

with

direct

calibration

eve

ry

10

KCS

on

80,

40,

and

20

meter

bands;

every

20

KCS

on

the

15

meter

band

and

every

50

KCS

on

the

10

meter

band.

In

addition,

an

arbitrary

band

spread

logging

scale

is

provided

for

use

throughout

the

tuning

range

of

the

receiver.

CB

Channels

are

also

indicated.

A

new

audio

output

circuit

feature

is

the

Auto-Response

which

auto-

matically

narrows

and

widens

the

frequency

range

of

the

audio

output,

depending

upon

the

gain

required.

This

feature

permits

the

receiver

to

be

used

as a high-fidelity

receiver

on

stronger

signals,

while

pro-

viding

the

sharp

cutoff

required

in

receiving

communication

b"gnals.

A

second

advantage

of

the

Hammarlund

Auto-Response

is

the

rapid

damping

of

the

audio

power

in

the

speaker

voice

coil

which

greatly

min-

imizes

undesirable

speaker

"hangover."

The

receiver

may

be

used

with

eithe r speaker

or

headphone

s.

Fast

acting

AVC

maintains a constant

audio

leveL

Adequate

filtering

practically

eliminates

AC

power

ripple.

The

HQ-lOOA

is

equipped

with a stable

beatfrequency

oscillator

which

provides

the

operator

with a continuous

range

of

audio

tones

when

re-

cei

ving

telegraph

code

signals,

or

excellent

single -side

band

reception.

An

"S"

meter

is

provided

to

obtain

accurate

reading

on

received

phone

signals

and

to

assure

"on-the-nose"

tuning.

A

send-receive

switch

is

provided

to

silence

the

receiver

while

transmitting.

Large,

comfortable

controls

in

logical

groupings

are

provided

for

greate

st

operating

ease.

The

new

futuristic

front

panel

is

clearly

marked

to

permit

full

attention

to

the

operating

at

hand.

The

HQ-lOOA

was

designed

with

you

in

mind.

You'll

have

many

hours

of

pleasure

and

use

in

operating

this

truly

fine

communications

instrument.

1

FREE DOWNLOAD

COURTESY OF N9SOR

WWW.HAMMARLUND.ORG

RECEIVER

figure

2.

Installation

of

Single-wire

Antenna

300

OHM

TV

TWIN LEAD

RECEIVER

figure

3.

Installation

of

folded

Dipole

Antenna

2

FREE DOWNLOAD

COURTESY OF N9SOR

WWW.HAMMARLUND.ORG

INSTALLATION

UNPACKING

Unpack

the

receiver

carefully.

Make

sure

the

tubes,

associated

tube

shields

and

pilot

lamps

are

in

place.

SPEAKER

CONNECriON

Connect a 3.2

ohm

permanent

magnet

dynamic

speaker

(Hammar

lund

S-100

Speaker)

to

the

two

ter-

minals

marked

SPKR.

on

the

rear

of

the

chassis.

(Note

Figure

4).

For

best

performance

do not

place

speaker

on

top

of

receiver

cabinet.

POWER

CONNEUIONS

Before

inserting

attachment

plug into

power

outlet,

make

certain

power

source

is

of

proper

voltage

and

frequency.

(Refer

to

paragraph

one of INTRODUC-

TION. )

INSTALLING

ANTENNA

The

HQ-100A

is

designed

to

operate

with a

single

wire

or a balanced

type

antenna.

The

front

panel

an-

tenna

trimmer

control

(Figure

5)

permits

a good

match

to

most

antennae

systems

of 50

to

600

ohms.

For

general

coverage,

single

wire

antennae

of 20

to

50

feet

length

will

provide

surprisingly

good

recep-

tion.

A long

single

wire

outdoor

antenna,

such

as

shown

in

Figure

2,

will

generally

provide

entirely

satisfactory

performance.

This

wire

may

be

50

to

150

feet

long.

For

best

reception,

the

antenna

should

be

isolated

as

much

as

possible

from

neighboring

objects

and

at

right

angles

to

power

lines

or

busy

highways

so

as

to

minimize

possible

interference

pickup.

Optimum

performance

on a

particular

amateur

band

or

other

narrow

tuning

range

will

be

obtained

by

using

a

tuned

half-wave

dipole

or

folded

dipole

fed with 300

ohm

transmission

line

or

other

suitable

lead-in,

as

shown

in

Figure

3.

To

tune

the

one-half

wave

length

dipole,

the

follow-

ing

formula

for

the

length

of

the

antenna

may

be

used:

Length

(feet) =

Fre~~8(MCS)

Each

half

(1/4

wave length)

is

half

the

length

found

from

the

above

formula.

A good

ground,

although

not

always

necessary,

will

generally

aid

in

reception

and

reduce

stray

line

hum.

Reversal

of

polarity

of

power

cord

plug

may

possibly

further

reduce

line hum in

some

locations.

CABINET

CHASSIS

o

METER

ZERO

3.2

OHMS PHONES ADJUST

o

o

figure

4.

Connection

Points

at

Rear

of

Chassis

3

FREE DOWNLOAD

COURTESY OF N9SOR

WWW.HAMMARLUND.ORG

®--------------

17

1

2

3

INDEX

NO.

1

2

3

4
5

6

7

8

INDEX

CONTROL

NO.

Automatic

Clock-Timer

Control

9

Function

Switch

10

ANTENNA

Trimmer

11

MAIN TUNING

Control

12

SENSITIVITY

Control

13

MAN.

-AVC

Switch

14

Band

Selector

Switch

15

Noise

Limiter

Switch

16

17

Figure

5.

location

of

Controls

CONTROL

AUDIO GAIN

Control

Electrical

BAND

SPREAD

Control

SELECTIVITY

Control,

Q -

Multiplier

Frequency

Control,

Q -

Multiplier

"S"

Meter

Electrical

Band

Spread

Dial

BFO

Frequency

Control

Main

Tuning

Dial

Telechron

Automatic

Clock-Time.

j

I

I

I

.'

4

FREE DOWNLOAD

COURTESY OF N9SOR

WWW.HAMMARLUND.ORG

OPERATION

Basically,

all

that

is

necessary

to

operate a radio

receiver

are

the

tuning

and

volume

controls.

The

addi-

tional

controls

found

on

the

front

panel

of a communica-

tions

receiver

such

as

the

HQ-100A,

control

functions

which

greatly

improve

operating

performance

and

make

possible

reception

of

oth~rwise

unintelligible

signals.

NORMAL

CONTROL

SETTINGS

For

"normal"

operation

such

as

broadcast,

short

wave

listening,

etc

.•

the

position

of

the

various

con-

trols

should

be

as

follows:

Function

Switch

. .

·

Receive

(REC.)

ANTENNA

Trimmer

·

Tune

for

highest

"S"

meter

reading

on

sig-

nal.

MAIN TUNING

Control

. . .

Tune

for

highest

"S"

meter

reading

on

sig-

nal.

SENSITIVITY

Control

·

Fully

clockwise

MAN. -AVC

Switch.

.

· AVC

Band

Selector

(TUNING.

·

Set

to

desired

frequen-

RANGE MCS)

Switch

cy

range.

Noise

Limiter

Switch

·

OFF

AUDIO GAIN

Control.

·

Adjust

for

proper

lev-

el.

BAND

SPREAD

Control.

·

Set

counterclockwise

to

"100"

on

band

spread

dial.

SELECTIVITY

Control

. . .

OFF

Frequency

(FREQ. ) Control . Set

pointer

to

trian-

gular

marking.

CODE

SIGNAL

RECEPTION

For

reception

of

code

signals,

the

controls

should

be

set

as

follows:

Function

Switch

. .

·

BFO

ANTENNA

Trimmer

·

Peak

for

maximum

out-

put

on

"S"

meter.

MAIN TUNING

Control

·

Peak

for

maximum

out-

put

on

"S"

,meter.

SENSITIVITY

Control

Adjust

for

desired

out-

put

level.

MAN. -AVC

Switch

.

Manual

(MAN.)

Band

Selector

(TUNING

Set

to

desired

frequen-

RANGE MCS)

Switch

cy

range.

Noise

Limiter

Switch

.

OFF

or

ON

as

required

by

local

noise

condi-

tions.

AUDIO GAIN

Control

.

2/3

to

3/4

clockwise

ro-

tation.

SELECTIVITY

Control

ON

position

BFO

FREQ

Control.

Tune

signal

to

zerobeat

with

pointer

on

zero

and

then

offset

either

left

or

right

for

des

ired

pitch.

FUNUION

SWITCH

Three

operating

and

an

OFF

position

are

provided.

For

AM

reception

the

REC

position

is

used.

CW

or

SSB

signals

may

be

received

with

the

FUNCTION

switch

on

BFO.

If

the

receiver

is

used

with a trans-

mitter

the

switch

should

be

in the SEND

position.

SINGLE

SIDE

BAND

OPERATION

The

setting

of

the

controls

for

Single Side

Band

reception

is

the

same

as

for

CW

reception

with

the

BFO

being

used

for

carrier

reinsertion.

The

BFO

fre-

quency

control

should

be

set

approximately

2-1/2

divisions

to

the

left

or

right

of

the

zero

indice,

de-

pending

upon

whether

the

upper

or

lower

sideband

intelligence

is

desired.

Final

tuning

should

be

accom-

plished

with

the

BAND

SPREAD

control

in

order

that

proper

speech

registry

be

achieved.

BAND

SPREAD

OPERATION

The

BAND

SPREAD

control

may

be

used

for

fine

tun-

ing

by Betting

it

at

apprOXimately gO'on

the

band

spread

5

FREE DOWNLOAD

COURTESY OF N9SOR

WWW.HAMMARLUND.ORG

m

dial

and tuning in the

signal

with

the

MAIN

TUNING

control.

Final

peaking of

the

signal

is

then

accom-

plished

by

adjustment

of the BAND SPREAD

control.

It

should

be

understood

that

the

setting

of

the

BAND

SPREAD

control

will

affect

the Main

Dial

calibration

in

that a higher

frequency

setting

of

the

main

tuning

dial

will

be

required.

Rotating

the

band

spread

dial

from

100

toward 0 tunes

the

receiver

to a lower

frequency.

For

Band

Spread

operation

in the

amateur

bands,

the

following

procedure

must

be

followed:

The

main

tuning

dial

is

set

to

the

line

marking

the

high

frequency

(right-

hand end) of a

given

amateur

band.

The

Band

Spread

tuning and

calibration

may

then

be

accomplished

solely

with

the

BAND SPREAD

control

and

dial.

20BS

SWITCH

POSITION

A

separate

switch

position

is

provided

on

the

TUNING RANGE

control

for

spreading

the

20-meter

band.

This

switches

in

another

band

spread

capacitor

for

optimum

spreading

of

this

band.

TElECHRON

AUTOMATIC

TIMER

If

your

receiver

is

equipped

with the

built-in

24

hour

Telechron

Automatic

Clock-Timer,

the

following

instructions

should be

noted:

Every

radio-frequency

device

is

stable

only

at

pre-

determined

operating

temperatures.

In

order

to

elim-

in

ate

waiting

for

receiver

to

warm-up

to

operating

temperature,'

the

Telechron'Timer

automatically

turns

on the

receiver

ahead

of

anticipated

operating

time.

This

is

accomplished

by

setting

the hand of the

timer

(small

knob

at

rear

of

receiver)

to

approximately

one-

half

hour

before

operating

hour.

The

front

panel

con-

trol

under

Timer

is

then

set

to

"Auto"

position.

The

function

switch

is

set

to REC. The

receiver

is

then

automatically

turned

on

at

the

desired

time.

The

clock

hands

are

set

by

the

rear

knob.

Push

in

on

the

knob to

set

the

switch

timing

hand and

pull

out

on the knob to

set

the

clock

hands.

The

front

switch

is

setto

AUTO and

the

operation

switch

is

set

to REC.

when

it

is

desired

to

use

the

automatic

clock

switch

for

pre-warming

the

receiver

before

operation

or

for

use

as

an

alarm

to

turn

the

receiver

on to a

pre-tuned

station.

To

use

the

operation

switch

normally,

the

clock

switch

should

be

left

in

the

ON

position.

The

clock

will continue to

run

as

long

as

the

receiver

line

cord

is

connected

to

the

power

outlet,

and

is

ex-

tremelyusefulfor

checking

sign-in

periods

and

sched-

ules.

If

your

receiver

is

not equipped with the

Telechron

Automatic

Clock-Timer,

and you would

care

to

have the

accessory

added,

clock

kits,

with

full

installation

instructions.

may

be

had

by

writing

Harnmarlund

Manufacturing

Co.

73-88

Harnrnarlund

Drive,

Mars

Hill,

North

Carolina

or

by

contacting

the

nearest

Harnrnarlund

dealer.

POSSI

BlE

RECEIVER

01

FFI

(Ul

TI

ES

1.

If,

upon

turning

the

function

switch

from

"off"

distortion

is

preferable

to

excessive

pulse

type

to

"receive"

position,

the

dials

are

not

illumi-

noise,

such

as

ignition

interference.

nated

and

the

receiver

fails

to

operate

after

two

minutes,

this

indicates

that

the

clock

timer

3.

Erratic S meter

performance,

lack

of

sufficient

switch

just

above

the

function

switch

is

nat·in

variation,

etc.,

is

usually

due

to

the

two 6BA6

the

proper

position.

This

switch

should

always

tubes

employed

in

the S meter

circuit.

These

be

in the

ON

position

unless

auto

timer

is

em-

are

the

tw06BA6tubes,

V5 and V6, in

the

sche-

ployed.

matic

diagram.

Merely

interchanging

these

tubes

will

sometimes

provide

sufficient

im-

provement.

Replacing

one

or

both

may

be

found

2.

Excessive

hum

or

failure

of

the

Qmultiplier

to

advisable

before

suspecting

other

troubles.

operate

properly

will

usually

be

due to a

de-

fective

12AX7

type

tube.

Such a

defective

tube

4.

Excessive

drift,

after

allowing

sufficient

time

may

test

good in a

tube

tester

but

be

unsatis-

for

warm

up,

may

be

due

to a poor

type

6C4

factory

because

of

higher

than

normal

heater-

tube, V3, in

the

diagram

or

6BE6, V2,

in

the

to-cathode

leakage.

Poor

noise

limiter

action

schematic

diagram.

is

usually

due

to a poor

or

defective

6BV8

type

tube.

The

use ofthe

noise

limiter

will

result

in

Ninety-nine

percent

of

all

receiver

trouble

has

been

some

distortion

which

must

be

tolerated

for

found

to

be

due

to

one

or

more

defective

tubes.

This

most

efficient

noise

limiting.

Because

of

this"

can

undoubtedly b e

attributed

to

the

rough

handling

when

listening

to

broadcast

stations

or

oth'er

equipments

receive

in

shipment.

Please,

therefore,

strong

local

signals,

the

noise

limiter

switch

be

sure

to

follow

the

above

suggestions

in addition to

should

be

in

the

"off"

position

unless

the

slight

haVing

all

tubes

tested

before

writing

the

Home Office.

6

FREE DOWNLOAD

COURTESY OF N9SOR

WWW.HAMMARLUND.ORG

CIRCUIT

THEORY

The HQ-100A

basically a single

conversion,

four-

band,

superheterodyne

receiver

with a noise

limiter

.Its

circuitry

incorporates a Q-Multiplier

for

full

control

of

selectivity

and a

stable,

beat

frequency

oscillator.

PRESELEGION

The

antenna

input

coupling and

RF

amplifier

stage

provide

the

necessary

preselection

and

gain

for

high

performance

and

rejection

of

undesired

signals.

The

high

signal

level

at

the

mixer

grid,

V2,

contributes

to a favorable

signal-to-noise

ratio.

Both

grid

and

plate

circuits

of

the

RF

stage

are

tuned;

individual

tuning

coils

are

selected

for

each

band.

The

antenna

compensating

compacitor,

adjustable

from

the

front

panel,

permits

the

receiver

to

be

resonated

for

optimum

performance

with

the

par-

ticular

antenna

in

use.

CONVERTER

STAGE

A high

degree

of

oscillator

stability

is

attained

by

the

use

of a

separate

mixer

(6BE6), V2,

and

an

inde-

pendent

oscillator

(6C4), V3.

The

output

signal

from

RF

amplifier

Vl

is

heter-

odyned with

the

output of

the

local

high

frequency

oscillator,

V3,

and

electronically

combined

within

the

mixer

tube,

V2,. On

the

four

frequency

ranges

the

local

oscillator

is

455

KCS

above

the

signal

fre-

quency.

Low-loss

tube

sockets,

low-loss,

phenolic

temper-

ature

compensating

capacitors,

and

stable,

coaxial

trimmers

all

contribute

to

oscillator

stability.

Addi-

tional

frequency

stability

is

attained

by

applying

regu-

lated

voltage

to

the

oscillator

circuit

and

by

the

rugged

construction

of

the

entire

HF

oscillator

section

as-

sembly.

Q

MULTIPLIER

The

Q-Multiplier

frequency

control

prOVides a

means

of

peaking

any

signal

within the

pass

band

of

the

IF

amplifier.

The

degree

of

peaking

is

controlled

by the SELECTIVITY

control.

This

same

SELECTI-

VITY

control

when

turned

completely

counter-clock-

wise

disconnects

the

Q-Multiplier.

If

interference

is

experienced,

either

between

sta-

tions

close

to one

another

or

from

an

interfering

SW

signal,

gradually

advance

the

Q-Multiplier

selectivity

control

from

its

normally

off

or

extreme

counterclock-

wise

position.

This

will

result

in

increased

selecti-

vity

by

producing a spike

of

narrow

bandwith

that

is

adjustable

from

approximately 3 KCS

to 100

cycles

in width. The

narrowest

bandwith

being

obtained

by

adjustment

of

the

Q-Multiplier

selectivity

control

to

the

point

just

below

that

which would

cause

the

Q-Multiplier

to

break

into

self-oscillation

as

evi-

denced

by

the

receiver

blocking with a

resultant

loss

of

volume.

The

Q-Multiplier

is

generally

never

employed

on

the

standard

broadcast

band

or

when

short

wave

broadcast

stations

are

being

received.

The

use

of

the

Q-Multiplier

under

these

circumstances

will only

result

in

limiting

the

frequency

response

of the

broad-

cast

band and

short

wave

broadcast

stations

in view

of

the

very

narrow

band width

that

is

provided

by

the

Q-Multiplier.

Of

course,

the

SELECTIVITY

control

will

make

it

possible

to

control

this

response

charac-

teristic.

If,

by

chance,

when

receiving

foreign

short

wave

broadcast

stations

interference

is

experienced

caused

by two

stations

operating

very

close

to

one

another,

the

Q-Multiplier

maybe

employed

under

these

circumstances

to

minimize,

if

not

eliminate,

the

inter-

ference

by

the

improved

selectiVity

or

decreased

band

width

proper

adjustment

will

provide.

The

proper

use

of

the

Q-Multiplier

can

actually

enhance

many

times

the

result

obtained with

this

receiver.

In

view of this"

it

is

suggested

that a little

time

be

spent

in

learning

just

how

to

properly

adjust

the

Q-Multiplier

frequency

and

selectivity

controls

under

different

receiving

condi-

tions.

As

the

Q-Multiplier

SELECTIVITY

control

is

advanced, a

decided

decrease

in

noise

will

be

ap-

parent.

This

is

due

to

the

narrowing

of

the

pass

band.

On

AM

phone

signals

this

control

will

usually

be

be-

tween

the 7 and

11

o'clock

positions.

The

FREQUEN-

CY

control

should

then

be

adjusted

for

clarity

of

sig-

nal

or

for

minimum

adjacent

channel

interference.

The

SELECTIVITY

control

may

be

advanced

progres-

sively

more

for

SSB and

CW

reception.

The

more

this

c·ontrol

is

advanced,

the

more

critical

the

setting

of

the

FREQUENCY

control

becomes.

Advancing

the

SELECTIVITY

control

too

far

will

cause

the

Q-Multi-

plier

to

oscillate.

This

should

be

avoided.

The

Q-

Multiplier

is a very

handy

tool

in

the

hands

of

an

experienced

operator

and,

unfortunately,

it

is

beyond

the

scope

of

this

instruction

manual

to

attempt

to

be

more

definite

than

we

have.

IF

AMPLIFIER

Seven,

stable

tuned

circuits,

in two

stages

of

IF

amplification

(V5

and

V6),

contribute

to

sensitivity

and

selectivity.

Iron

core

permeability-tuned

trans-

formers

improve

performance

and add

to

the

ease

of

adjustment.

The

intermediate

frequency

is

455 KCS,

the EIA

standard.

Ave

SYSTEM

Automatic Volume

Control

minimizes

fading and

signal

strength

variations

by

controlling

the

gain of

the

RF

stage

Vl

and

the

IF

stage

V5.

As

a

result,

a

comfortable

and

constant

level

of audio

is

maintained.

7

FREE DOWNLOAD

COURTESY OF N9SOR

WWW.HAMMARLUND.ORG

"S"

METER

ICARRIER

LEVEl]

The "S",

or

Tuning,

Meter

is

provided

to

assist

in tuning and

to

give

an

indication of

relative

signal

strength.

Because

the

meter

reading

are

propor-

tional

to

AVC

voltage,

it

is

operative

only

in the

AVC

position.

The

meter,

which

is

calibrated

to 40 db

over

S-9,

is

factory

adjusted

so

that a signal

input of

approxi-

mately

50

microvolts

gives a reading

of S-9.

Each

"S"

unit

indicates

a 6 db

increase,

eqUivalent to

doub-

ling

signal

strength.

Should

meter

readjustment

be

necessary:

L Set function

switch

to REC.

2.

Set

front

panel

SENSITIVITY

control

to

"10"

and

Q-Multiplier

SELECTIVITY

control

to

OFF.

3.

With

receiver

off,

mechanically

zero

pointer

with a fine

screwdriver.

4.

With A

VC

on and

the

ANT.

terminals

shorted,

zero

pointer

with ZERO ADJ

potentiometer

R-15.

DETECTOR

AND

NOISE

LIMITER

One diode

section

of

the

6BV8 tube, V7,

is

used

for

the

second

detector

and

AVC

system.

This

system

produced a minimum

of

distortion.

The

other

diode of

V7

operates

as a series,

self-

adjusting

noise

limiter.

It

will

reduce

automobile

+4

+2

0

-2

-4

•

-6

~

u

...

<J

-9

0

g

-10

~

-12

~

lD

-14

0

-16

-18

-20

-22

ignition and

other

types

of

impulse

noise

to a mll1l-

mum.

Intelligibility

is

not

affected

by

the

noise

lim-

iter,

although

it

may

be

switched

off if

desired.

BEAT

FREQUENCY

OSCILLATOR

IBFO]

The

BFO

is

activated

by the FUNCTION

switch

for

reception

of CW

or

SSB

signals

or

as

an

aid

in

loca-

ting

weak

SW

broadcast

stations.

The

BFO

control

is

used

under

these

conditions

to

vary

the

pitch.

Each

calibration

diVision of

this

control

represents

approx-

imately

1000

cycles.

When

receiving

single

side

band

transmission,

the

generally

accepted

procedure

of

setting

the

beat

frequency

oscillator

approximately

1000

cycles

above

or

below

zero

beat

should

be

em-

ployed. In

other

words,

if

the

beat

frequency

oscil-

lator

FREQ.

control

is

set

one

degree

clockwise

or

counterclockwise

from

the

center

position,

optimum

single

side

band

reception

will

usually

be

obtained.

Whether

the

beat

frequency

oscillator

control

will

be

set

clockwise

from

zero

beat

will depend on

whether

upper

or

lower

side

band

is

being

transmitted.

If

the

beat

frequency

oscillator

is

on

the

wrong

side

of

zero

beat,

it

may

be

impossible

to obtain

intelligibility

of

the

single

side

band

signal

when

the

band

spread

dial

is

tuned

very

slowly

through

the

single

Side band

sig-

signal.

Should

such

a condition

arise,

merely

rotate

the FREQ.

control

from

the

one

degree

counterclock-

wise

to the one

degree

clockwise

position

and

then

very

carefully

adjust

the BANDSPREAD

for

intelligi-

ble

speech.

The

BFO

frequency

control

may

also

be

16

1

IIIIl

--

,-.

~

J

-

~

,..

...

"'

I'

,

~P"

~

,

L

-.....

..-

/

,

.~

"

I'

..4

A

~

~

,

I

....

~

HQ'IOO AudiO

Chara"er'lt"

\.

A -

Ma

•. A F Gain Comrol

I(

~

8 - - - AF Gain Appro.

2S

~

of

r.tali."

I~

fro

..

Min. Simulrting

Averaq41

IJ

Settin9

for

11><0

8roadcal;t

~

StcItiont

( IV

at

A"t4lll"a

In""t

)

,

Output

.,1000

CPS'

500

MW

~

I

A

I_t

.10 V

A,rou

AF

Cla,n

Control

Cow

..

ont

B Input 1.4V

A"auAFGoinC

...

lrol

C.OIl1OIo"I

,

~

10

10

1

10)

Frequency

,n

Cycles

Per

Second

figure

6.

Auto-Response

Cur"e

8

FREE DOWNLOAD

COURTESY OF N9SOR

WWW.HAMMARLUND.ORG

----------------@

employed

as

a fine

tuning

adjustment

to

obtain

desired

speech

quality.

Here

again

experience

is

the

best

teacher.

The

stability

of

both

the

high

frequency

os-

cillator

and

the

beat

frequency

oscillator

employed

in

this

receiver

plus

the

excellent

mechanical

rigi-

dity

will

prOVide

excellent

single

side

band

reception.

Refer

to

the

paragraph

on the

Q-Multiplier

operation

for

increase

selectivity

or

narrowing

of

the

passband

usually

permissable

with

CW

and

sideband

reception.

It

may

be

found

desirable

to

place

the

function

switch

on

BFa

while

tuning

to

aide

in

locating

weak

signals.

As a

result

of

activating

the

BFO,

each

carrier

tuned

in

will

produce a beat

note

or

whistle

easily

discern-

able.

If

a phone

signal

is

located

in

this

manner,

adjust

the

bands

pre

ad

tuning

control

for

the

lower

pitch

tone

or

zero

beat.

This

will

result

in

centering

the

desired

phone

signal

and

now

placing

the

function

switch

on

REC

will

allow

for

normal

AM

operation.

AUDIO

AMPI.IFIER

The

first

audio

stage

is a resistance

coupled

voltage

amplifier

employing

the

other

section

of

the

l2AX7

(V4B).

The

audio

output

stage

is

a 6AQ5

beam

power

amplifier

(V8) prOViding

an

undistorted

output

level

of

at

least

one

watt.

A

feature

ofthe

audio

system

is

the

variable

negative

feedback

employed

(see

Auto-Response

Curve,

Figure

6).

Maximum

feedback

is

provided

at

low

settings

of

the

AUDIO GAIN

control

for

the

fine

quality

reception

of

local

broadcast

and

strong

short

wave

stations.

As

the

AUDIO GAIN

control

is

increased,

the

feedback

decreases

so

that

on

reception

of

weak

signals

addi-

tional

selectivity

is

prOVided by

the

audio

section.

This

results

in

an

increased

signal-to-noise

ratio. A further

advantage

is

the

critical

damping

of

the

speaker

for

elimination

of

speaker

"hangover".

This

upgrades

the

reception

of

speech

and

music

and

decreases

the

noise

output of

the

receiver.

A

further

advantage

is

the

reduction

of

distortion

at

lower

settings

of

the

AUDIO GAIN

control.

ACCESSORIES

A

Now you

can

get

even

more

out

of

your

HQ-lOOA

This

is

not

usually

required

by

the

average

short

receiver!

wave

listener,

although

it

will

prove

an

aid

as a means

of

correcting

for

possible

dial

error.

The

amateur

operator

will

find

this

of

most

value

The

XC-lOO

Crystal

Calibrator

is

available,

pro-

since

the

100

KCS

checkpoints

this

unit

provides,

will

viding

checkpoints

every

100 KCs

within

the

range

of

make

it

possible

to

accurately

set

amateur

band

edges.

the

receiver.

This

will

result

in

improving

the

accuracy

of

the

am-

ateur

band

spread

dial,

by

determining

the

exact

set-

ting

of

the

main

tuning

dial.

The

kit

is

qUickly

and

easily

installed.

It

is

com-

plete

with

eas

y-to-follow

instructions

,operating

switch

and

mounting

hardware.

9

FREE DOWNLOAD

COURTESY OF N9SOR

WWW.HAMMARLUND.ORG

®--------------

SERVICE

AND

REALIGNMENT

PROCEDURE

NOTE

To

service

this

receiver,

disconnect

from

power

source

and

remove

all

leadwires

attached

to

terminal

connections

at

rear

of

chassis

apron.

Carefully

turn

the

receiver

up onto

the

front

panel

face

on a

smooth

clean

surf~ce.

Remove

the

two #10 hex

machine

screws

at

the

extreme

ends

of

the

chassis

apron

at

the

rear

of

the

cabinet,

and the knob

from

the

clock

adjustment

shaft ifreceiver

is

so

equipped.

Lift

cabinet

straight

up

and

off of

chassis.

To

reassemble,

use

reverse

procedure.

ANTENNA

ADJUSTME.II.IS

/ ADJUST

SUJG

AT

4MC ADJUST

SWG

AT

1.2

M.C

ADJUST

SLUG AT

L65

Me

ADJUST

SWG

AT IOMC \

WITH

ANT.

CAPACITOR

WITH

ANT.

CAPACITOR

WITH

ANT. CAPACITOR

WITH

ANT.

CAPACITOR

NEAR

MID. CAPACITY

NEAR

M I

N.CAPACITY

NEAR

MID. CAPACITY

NEAR

MID

CAPACITY

•

IF

ADJUSTMENTS

TOP

SLUG

ADJUST

AT

AT

1.65

MC

FOR MAX.

AT

4MC

BOTTOM

BOTTOM

SLUG

ADJUST

TOP

SWG

ADJUST

4MC

BOTTOM

SLUG

AMPLITUDE

SWG

ADJUST AT

TOP

SLUG

ADJUST

AT

ADJUST

AT

10

MC

10

MC

.6MC

BOTTOM

SLUG

\.\...

-J/

'\

ADJUST AT

1.65MC

R F

ADJUSTMENTS

H F

OSc.

ADJUSTMENTS

figure

7.

)'op

View

of

Chassis

I

10

FREE DOWNLOAD

COURTESY OF N9SOR

WWW.HAMMARLUND.ORG

IF

ALIGNMENT

NOTE

Use a non-

metallic

alignment

tool

such

as

Gen-

eral

Cement

Co. No. 5097,

or

equal.

a.

Connect

the

output

cable

of a 455 KCS

unmodu-

lated.

signal

generator

to

the

bus

lead

of

the

6BE6

mixer

gnd.

The

frequency

accuracy

of

the

generator

may

be

checked

with

sufficient

precision

by

picking

up

its

second

harmonic

(910 KCS)

in

any

receiver

whose

calibration

at

910 KCS

has

been

checked

as

correct

and

then

adjusting

the

generator

frequency.

b.

Connect

aDC

vacuum

tube

voltmeter,

set

for

neg-

ati

ve

voltage

reading

to

pin S of

the

V7, 6BVS

socket.

c.

Set

the

receiver

controls

as

follows:

BAND

SPREAD

dial

on 100

Function

switch

on

REC.

Main

tuning

dial

on

. 54

MC

Noise

limiter

switch

on

OFF

AUDIO GAIN

control

at

minimum

SELECTIVITY

control

on

OFF

Band

selector

switch

on . 54 - 1. 6 MC

MAN.

-AVe

switch

on MAN.

SENSITIVITY

control

on 3

from

maximum.

d.

During

alignment,

adjust

the

generator

output

and

the

SENSITIVITY

control

to

prevent

over-

loading.

Final

adjustment

should

be

made

with

the

SENSITIVITY

control

at

approximately

the

third

indice

from

its

maximum

(clockwise)

posi-

tion.

Adjust

each

of

the

three

IF

transformers

fo,('

maximum

meter

reading.

Topside

adjust-

ments

(Figure

7)

are

secondaries

or

grid

cir-

figure

B.

Bottom

View

of

Chassis

11

FREE DOWNLOAD

COURTESY OF N9SOR

WWW.HAMMARLUND.ORG

@--------------

cuits;

bottom

of

chassis

adjustments

(Figure

8)

are

primaries

or

plate

circuits.

e.

Turn

the

Q-MULTI.

ON

and

adjust

the

SELEC-

TIVITY

control

clockwise

to a

position

below

the

oscillating

point.

With

its

panel

bushing

nut

loosened

to

permit

the

frequency

shaft

to

turn

without

hindrance

by

the

stop,

adjust

the

FREQ.

control

to

obtain a maximum

meter

indication.

The

input

signal

must

be

adjusted

to a value

just

sufficient

to

obtain a good

meter

swing.

This

adjustment

is

the

center

frequency

of

the

pass

band.

While

the

meter

is

at

maximum,

turn

the

stop

lug to a

position

180

degrees

directly

opposite

the

stop

pin

in

the

frequency

shaft.

Holding

it

in

this

position,

tighten

the

bushing

in

the

nut

making

sure

that

the

shaft

or

the

stop

lug

have

not

turned bychecking

the

zero

setting.

f.

Turn

FUNCTION

switch

to

BFO.

With

the

BFO

frequency

control

on ZERO

adjust

the

slug

in

L7

for

ZERO

beat

with

the

AVC-MAN

switch

on

MAN

position

and

the

SENSITIVITY

control

adjusted

at a position

below

overload.

g.

With

the

MAN.

-AVCswitchon

AVC,

the

SENSI-

TIVITY

control

at

maximum,

with

grid

pin 1 of

the

V5

amplifier

tube

grounded,

and

with

no

signal

input,

adjust

the

METER

ZERO ADJUST.

pot

at

the

rear

of

the

chassis

(Figure

4)

for

a

reading

of

zero

on

the

"8"

meter.

RF

ALIGNMENT

NOTE

Use a non-metallic

alignment

tool

such

as

Gen-

eral

Cement

Co. No. 8282,

or

equal.

a.

The

slugs

and

trimmers,

having

been

factory

adjusted,

should

require a minimum

amount

of

adjustment

for

any

realignment.

b.

All

RF

and

oscillator

slug

adjustments

are

made

from

the

top

of

the

shield

cans.

See

Figure

7.

c.

Connect

the

unmodulated,

signal

generator

out-

put

cable

to

the

antenna

and

ground

terminals

of

the

receiver,

with

the A terminal

adjacent

to

the G terminal

jumped

together.

See

Figure

4.

d.

Set

the

controls

the

same

as

for

IF

alignment

above.

Adjust

the

SENSITIVITY

control

as

re-

quired

to

obtain a sufficient

voltmeter

read-

ing

and

to

prevent

overloading.

e.

The

oscillator

adjustment

is

made

first.

The

RF

is

adjusted

next

to

obtain

maximum

ampli-

tude.

The

antenna

slugs

are

adjusted

last.

A

certain

amount

of

interaction

will

occur

between

the

oscillator

and

RF

adjustments,

partiCUlarly

on

the

higher

frequency

bands.

Final

adjust-

ment

should

be

accomplished

by

combined

or

alternate

adjustment

of

the

oscillator

and

RF

for

maximum

amplitude.

NOTE

The

trimmer

adjustments,

if

required,

should

be

the

final

adjustment

for

each

band.

See

Fig-

ure 8 for

location

of

trimmers.

There

is

no

RF

amplifier

adjustment

for

the

. 54 - 1. 6 MCband.

f.

Note

that

the

oscillator

frequency

in

the

HQ-100

is

always

on

the

high

side

of

the

signal

frequency

by 455 MCS.

Therefore,

it

is

necessary

to

make

sure

that

the

oscillator

frequency

is

not

adjusted

below

the

signal

frequency

which

would

be

an

image

response

of

the

signal.

g.

It

will

be

necessary

to

repeat

low

and

high

end

alignment

adjustments

of

each

band

since

the

adjustments

are

interdependent.

The

process

should

be

repeated

until

maximum

amplitude

is

obtained

at

both

alignment

frequencies

of

each

band.

NOTE

The

receiver

should

be

warmed

up

at

least

one-half

hour

before

final

oscillator

frequency

adjustments

are

made

for

the

dial

calibration

check.

DIAL

CAI.IBRATION

a.

Use a crystal

calibrator

haVing 100

KCS

and

1000

KCS

output.

Set

the

arbitrary

band

spread

dial

scale

to

100.

Set

the

function

switch

to

BFO.

Set

the

BFO

FREQ.

control

to

zero.

Set

the

SELECTIVITY

control

toOFF.

Set

the

MAN.

-AVC

switch

to

MAN.

b.

Check

to

see

that

the

frequencies

at

or

near

the

alignment

frequencies

are

"on

the

line."

If

not,

make

minor

adjustments

of

the

slugs

and

trim-

mers

(Figures 7 and

8)

to

make

them

correct.

CAUTION

Weaker

signals

will

be

observed

at

dial

settings

apprOXimately 10 KC8

above

each

calibration

dial

marking.

These

are

image

signals

from

1

MC

above

the

desired

signal

and

may

be

re-

cognized

by

their

somewhat

weaker

strength

and

may

be

further

reduced

by

proper

adjust-

ment

of

the

gain

controls.

They

will,

of

course,

be

more

noticeable

on

the

higher

bands.

Keeping

the

antenna

tuned

will

help.

12

FREE DOWNLOAD

COURTESY OF N9SOR

WWW.HAMMARLUND.ORG

CI)

Cl

o

eX)

co

o

o

~

co

o

o

N

20

30

--.

,

II

, ,

--,

,

•

.

•

I

1\

,

\

j

I{

\

,

I I

\

\

IT

117

\

\ \

II

I

A-++\

,

\

..

C

I

1/

\

I

,

I

,

,

--.

--,

--,

,

--,

"

I!t

i

II

I~

\

\ I

II I

\'

\

I!

1'7

,

\

1\

\

I j

7

I

,

1\ \

T

"

,

-,

TT

\

\

,

.1

~\

\

,

/I

\'

\

,

,,'/

\

I

\

,

,

~

,

,

1\

I

,

l=

HO-IOO

Selectivity

,

l-

•

I'

I-

A

-Regular

if

" I

II

I-

6.0

KC

at

6 DB

,\

.

I j

I-

1\\

~

I 1

~

B-

-0

Mult.

Max.width

2.9

KCat6DB

h:

,,

r-

c----Q

Mutt. Adj'd

for

\\

,

I

I,

-

.3

KC

016

DB

~I

V

30

20

10

0 + 10

K C

off

Resonance

Figure

9.

Se'ectivity

Curves

13

FREE DOWNLOAD

COURTESY OF N9SOR

WWW.HAMMARLUND.ORG

:i;:

TABLE

1.

TUBE

SOCKET

VOLTAGES

MEASURED

FROM

TUBE

SOCKET

PINS

TO

CHASSIS WITH VTVM AUDIO GAIN MINIMUM. BAND SWITCH ON 10 TO 30

Me.

LIMITER

OFF.

AVC-MAN SWITCH ON MAN.

SENSITIVITY

MAX.

OPERATION

SWITCH ON

REC.

Q-MULTIPLIER

OFF.

LINE

VOLTAGE

117. NO SIGNAL

INPUT.

TUBE

SOCKET

PIN NUMBERS

SOCKET

NO.

1

2

3 4

5

6 7 8

9

V1RF

6BZ6

V2 MIXER

6BE6

V3

HFO

6C4

V4

12AX7

Q

MULT.

1st

A-F

V5

1st

IF

6BA6

V6

2nd

IF

6BA6

V7 6BV8

DET

LIM AVC

BFO

VB

6AQ5

AUDIO

OUTPUT

V9

OA2

V-R

1.8

6.3

AC

210

105

-6

1.3

6.3

AC

205

70

90

6.3

AC

90

-3

TO

-9

90

1.5

60

6.3

AC

200

100

-8

BFO

ON 110

BFO

ON

6.3

AC

6.3

AC

200

1.2

AC

95

-.2

-9

BFO

ON

105

13

6.3

AC

105

210

205

FREE DOWNLOAD

COURTESY OF N9SOR

WWW.HAMMARLUND.ORG

TABLE

2.

TUBE

SOCKET

RESISTANCES

BAND

SWITCH

ON

10-30

MC.

MEASURED

FROM

TUBE

SOCKET

PINS

TO

CHASSIS. AUDIO GAIN MAXIMUM.

OPERATIONS

SWITCH

ON

REC.

BFO

OFF.

LIMITER

ON.

SENSITIVITY

MAXIMUM.

AVC-MAN

ON MAN.

TUBE

SOCKET

PIN

NUMBERS

SOCKET

NO.

-

1

2

3 4

5

6

7

8 9

VI

RF

10K

6BZ6

2.4M

ON AVC

180

0 0

.5

MEG

.5

MEG

0

V2

MIXER

6BE6

22K 180

0

0

.5

MEG

.5

MEG

0

V3

HFO

6C4

.5

MEG

INF

0 0

.5

MEG

47K

0

V412AX7

6800

Q

MULT.

1st

AF

.5

MEG

2.2

MEG

16KSEL

OFF

0 0

.5

MEG

1

MEG

2200

0

V5

1st

IF

0

180

6BA6

2.4M

ON AVC

0 0 0

.5

MEG

.5

MEG

10K

MIN

SENS

-

V6

2nd

IF

200

6BA6

470K

0 0

0

.5

MEG

.5

MEG

10K

MIN

SENS

-

V7

6BV8

DET

LIM

AVC

BFO

0

lOOK

.5

MEG

0

3.3

120 K

0

2.2

MEG

190 K

BFa

ON

lOOK

LIM

OFF

V86AQ5

AUDIO

OUTPUT

.5

MEG

430

0 0

.5

MEG

.5

MEG

.5

MEG

V9

OA2

V-R

.5

MEG

0

INF

0

.5

MEG

INF

0

.....

CJ1

FREE DOWNLOAD

COURTESY OF N9SOR

WWW.HAMMARLUND.ORG

m

Sche=atic
Designation

C1, Athru

C

C2, Athru

F
C3
C4,

5,

6,

7,8,9,10,
15,19,30,31,32,
34,35,36,41,48

Cll,

12,

13

C16,

17,

18
C20,21,22,23

C24
C25

C26,57

C27
C28
C29
C33,

45,

46

C38
C38A
C38B
C38C
C42
C43,44
C47
C49,50
C51
C52

C53
C54
C55
C56
C58
C59
C60

Ll

L2

L3

L4
L5
L6

L7

Rl,32

R2

R3

R4,

10
R5
R6,33
R8
R9,34

PARTS

LIST

Description

CAPACITORS

Variable,

Main

tuning

..•••.....•......•..•.•.....•.•.....•..•....•...

Variable,

Bandspread

..........•....•..............•.............••.•

Variable,

Antenna

Co=pensator

...•..•.•....•.......•.................

Fixed,

Ceramic

disc.

01

mf

1000V

.

Trimmer

1-8

mmf

500V

..........•.••.....•.•.......•..

"

......•..•..

Fixed,

silver

mica,

100

mmf

500V

...•.....•.••......•....•..•....•.•.

Variable

1-8

mmf

500V

...•...••...•...••....•••.•.•...•...

'

.••......•.

Fixed,

silver

mica

430

mmf

300V

...••......•.....•......•.••.•.•••...

Fixed,

silver

mica,

1300

mmf

500V

.....•...............•......•......

Fixed,

silver

mica,

3000

mrnf

500V

.....•...•••......•.......••...•...

Fixed,

silver

mica,

1100

mrnf

500V

..•....•.•...........•..•••...•••..

Fixed,

silver

mica,

3300

=mf

500V

..•....••.....••......•••........•.

Fixed,

silver

=ica,

510

=mf

500V

..•..................••......•••...

Fixed,

Ceramic

disc,

.04

mf

600V

.•...•••..•....•....•.......••....•

Fixed,

Three-section

electrolytic

....••.•••••.•.....•.......•...••••..

60

rnf

450V

(Part

of

1517-01-00001)

40

rnf

450V

(Part

of

1517-01-00001)

25

mf

50 V (Part

of

1517-01-00001)

Fixed,

Ceramic

disc,

.005

mf

1000V

....•......•......•..•.....•.•..•..

Fixed,

Ceramic

disc,

. 01

rnf

1400 V.........•••......•.....•.•..•.•...

Fixed,

Discap,

temperature

compensating,

6.8

mmf

............••..•....

Fixed,

Discap,

temperature

compensating,

2.7

=mf

.......•.....•....••

Fixed,

Discap,

te=perature

compensating,

6.8

mmf

..•..............•.•

Fixed,

Ceramic,

temperature

compensating

..••.

'"

...

'"

....•.•.•••...

non-insulated,

1,

5

mmf

Fixed,

Silver

mica 5 mmf

10%

500V

....•.....•......•.............•...

Fixed,

Ceramic

disc,

4.7

mmf

5%

N220

..•....

,.

.•....•.............•...

Fixed,

Ceramic

disc,

.02

MFD

500V

..•.•......•................••.••.

Fixed,

Silver

mica

350

mmf,

20%

100V

....•...••..........•............

Fixed,

Silver

mica

220

mmf

5%

500V

....•....••.......................•

Variable

....•......

'"

.••............•....•...........

"

•.....•.....

Fixed,

Silver

mica

2mrnf

±.

5

mmf,

500V

......•..•...••..••..•.••.•...

COILS
R.

F.

Coil

Assembly

(Bands 1 and

2)

........•..•.•......

,

...••......••.

R.

F.

Coil

Assembly

(Bands 3 and

4)

.....•.....••....

,

.•.•........••....

H. F Osc.

Coil

Assembly

(Bands 1 and

2)

...••••.......•....••.•....•.••

H.

F.

Osc.

Coil

Assembly

(Bands 3 and

4)

..•.•.••....••....•.•.•.••....

Coil

and

Ferrule

Assembly

..•......••...••.....•.............•.•.•••.

Choke,

Filter,

13

Henries

at

65

ma

D. C......••.•.•...•...•....•••....

BFO

Coil

.•...••.•.•......•...••.•.•..•..•.•.•..••........•••.••••••

RESISTORS
22

Ohms, 1/2W

.....•.•...........••.•.••..•......•.•......•.•.......

Potentiometer,

10,000

Ohms

.......•.........••.•..•....•..••...•.....

10,000

Ohms,

1/2W

...•...•....•.•...•.•..••...•.••.........•....•..•

1,000

Ohms,

1/2W

.••.........•.....••..••....••.•...•.....•...•.....

22,000

Ohms,

1/2W

.•....•..........•.....•...........•.........•..••

180

Ohms,

1/2W

.•...............•......•...•.........•.....•.....•..

6,200

Ohms, 1/2W

.•..•.•.........•....•..•.•..•..•....•...•.•..•....

47,000

Ohms,

1/2W

.................•..•••....•.........•.•••••..•.•.

Hammarlund

Part

No.

9441-60-40003
9441-60-40004
9434-45-40038
1509-01-01001

1527-01-00001
1519-01-00001
1527-01-00002
1519-02-03010
1519-02-03011
1519-02-03009
1519-01-03001
1519-02-05001
1519-01-03002
1509-01-01005
1517-01-00001

1509-01-01003
1509-01-01015
1509-01-00022
1509-01-00001
1509-02-00003
1509-01-02002

1519-01-00003
1509-02-00024
1509-01-01016
1519-02-00053
1519-01-00007

9434-45-40038

1519-01-00024

1809-01-00005
1811-01-00011
1809-01-00006
1811-01-00012
9001-03-00118

5626-02-00001

1804-02-00055

4703-01-00312
4735-02-00001
4703-01-00344
4703-01-00332
4703-01-00348
4703-01-00323
4703-02-00466
4703-01-00352

16

FREE DOWNLOAD

COURTESY OF N9SOR

WWW.HAMMARLUND.ORG

------------------@

Schematic
Designation

R11
R12
R13
R14,

16,

21, 29,

35
R15
R17
R19
R20
R27
R28
R30
R31
R36
R37
R38
R39
R40

SlA,

SIB
SIC
S2
S3
S4
S5

Tl
T2
T3
T4
T5,

6, 7

T8

T9

CRl,2
Fl
Fl

II,2

Jl

Ml
P2
P2

PARTS

LIST

Description

RESISTORS

(continued)

2.2

Megohms,

1/2W

.

6,8000hms,l/2W

.....•................•..........................

Potentiometer,

10,000

Ohms

.................•.......................

2,200

Ohms, 1/2W"

" .

Potentiometer,

200

Ohms

.....................•.....................

1,600

Ohms,

1/2W

5%

.••.....................•......................

180

Ohms,

1/2W

5%

.•...................•.................•.........

4,000

Ohms,

lOW

.

Potentiometer,

1

Meg

•..............................................

47

Ohms,

1/2W

..........................•.........................

'.

100

Ohms,

1/2W

............•...•....................................

430

Ohms,

1W

..........•...........................................

10

Ohms,

1/2W

.....••...........................................•...

470K

Ohms

1/2W

...•...............••.••.•....•.......•....•........

lOOK

Ohms,

1/2W

..........••.•••••..........•.................•...•

3.3

Ohms,

5W

........••....•.•......................................

22

Ohms,

1W

.....•.••.•.••...........................•.....•........

SWITCHES
Switch

Wafer

RF

.......•..................................•.•.•••...

Switch

Wafer

HF

Osc

.............•..•••....••.••......•.•...........

Power-On-Off,

SPST

(Part

of

R13)

OFF-REC

BFO,

Single

Section,

four

position

...•.•.....•••.•.••....•...

MAN.

-AVC,

SPST

...••••.••••..•......••.•..••••..•.•••••••••••.•....

LIMITER,

SPST

........•.•..•.............................••.•......

TRANSFORMERS

AND

COIL

ASSEMBLIES

Antenna

Transformer

Assembly

(Band 1).•..••••••..•.••.......•.•.....

Antenna

Transformer

Assembly

(Band

2)

..............................•

Antenna

Transformer

Assembly

(Band 3)......•........................

Antenna

Coil

Assembly

(Band

4)

..•••...•..............................

Transformer,

1st,

2nd,

and

3rd

1.

F.

..

.

Transformer,

Output,

Max

power

5W,

impedance

.

match;

10,000

Ohms

plate

to 4 Ohms

voice

coil.

Transformer,

Power,

Primary

115V

/230V

....................•.•.••.•.

50-60

cps.

MISCELLANEOUS
Diode,

Silicon

CER72C

.•........•••..........•..........•............

Fuse, 1 amp

(115V

Operation)

......••................•••.•.•..........

Fuse,

1/2

amp

(230V

operation)

..•••••.••.........•..•..•••.•••.•.....

Lamp,

pilot

#47,

6.3V, . 15A

.•......••.••......•..........••••••.....

Phone

Jack

..............•.•........•.•....................•..••.•..

Meter

"s"

(Carrier

Level)

...•..•••..••......••.•••...........•..•.•••

Adapter

(115V)

.•....•.•••••....•...••••......•.....•..•..••••......•

Adapter

(230V)

.......••••••..•..••••.•....•..•.•.....••••.........••

Telechron

Clock

Assembly

(115V/60

cps)

.••.•••..•..........•.•••••...•

Telechron

Clock

Assembly

(230V

/60

cps)

.•.................••.•••••.•..

Telechron

Clock

Assembly

(230V

/50

cps)

"

.•.•...............•

Crystal

Calibrator

XC-I00

...•••••......•.••••.•.•...........••.••.•..

Hammarlund

Part

No.

4703-01-00372
4703-01-00342
4735-01-08002

4703-01-00336

4735-01-00200
4703-02-00452

4703-02-00429
4714-01-01002
4735-01-00002
4703-01-00316
4703-01-00320
4704-02-00738
4703-01-00308
4703-01-00364
4703-01-00356
4713-01-00001
4704-01-00612

5105-01-00007

5106-02-00005

5106-02-00007

5101-01-00001

5101-01-00001

1809-01-00004

1810-01-00010

1811-01-00010

1812-01-00012

1811-01-00018
5618-01-00002

5603-01-00011

4807-01-00001
5134-01-00201
5134-01-00213
3901-01-00001
2109-01-00001
2902-01-00003
9001-03-00028
9001-03-00029
9207-01-00001
9207-01-00002
9207-01-00003
9205

-00-000

11

17

FREE DOWNLOAD

COURTESY OF N9SOR

WWW.HAMMARLUND.ORG

m

ADDITIONAL

HINTS

FOR

THE

NOVICE

AND

SHORT

WAVE

I.ISTENER

A

voltage

reading

of 45 -

50

volts

may

be

obtained

between

the

chassis

and a ground

as

the

result

of

the

two

power

line

by-pass

condensers

that

are

connected

across

the

power

line

with

the

center

tap

grounded.

Since we

are

dealing

with AC,

these

capacitors

will

look

like

resistors

to a volt

meter.

This

will

also

produce a slight

shock

if

the

chassis

is

not

grounded,

and one

happens

to

contact a grounded

object,

and

the

chassis

or

any

exposed

part

of

the

receiver.

This

al-

so

will

account

for a slight

spark,

if

the

receiver

is

connected

to

the

power

line

and

the

ground

connection

is

made.

For

protection

a good ground

should

always

be

employed.

In

using

the

receiver

for

CW,

or

with

the BFO,

it

is

absolutely

necessary

to

take

the

receiver

out

of

the

AVC

position

and

put

it

into the Manual

position.

Failure

to

do

this

will

result

in

the

receiver

blocking

and

erratic

action

of

the S

meter.

The S meter

is

only

usable

in

the

AVe

position.

When

using

BFO,

the

audio

control

should

be

used

at

2/3

to

3/4

rotation

clockwise

position

and

the

RFsensitivity

control

em-

ployed

as a means

of

adjusting

volume.

When

employing

the Q multiplier

for

phone

use

the

function

switch

will,

of

course,

be

in

the REC

posi-

tion

and

it

is

advisable

to

start

with the Q mUltiplier

selectivity

control

in

the

10

to

12

0'

clock

position.

If

this

control

is

advanced

past

approximately

the 2

o'clock

position,

the Q

multiplier

may

go into

oscil-

lation

resulting

in the blocking of

the

receiver.

For

use

on phone

the Q multiplier

selectivity

control,

will

also

usually

be employed

between

maximum

counter

clock

wise

position

and

approximately

straight

up.

Beyond

this

point

or

even

at

approximately

the

straight

up

position

the

receiver

is

usually

so

selective

that

it

is

capable

of

wiping

the

modulation

off

the

carrier

by

actually

rejecting

the

side

bands.

For

normal

phone

use

or

broadcast

reception

the

selectivity

control

should

always

be

employed

in

the

OFF

counter

clock

wise

position,

since

this

results

in

the

operation

of

a

switch

which

disconnects

the Q multiplier

from

the

IF

system.

If

it

is

desirable

to

use

the

BFO

to

locate a station

when tuning

for

weak

signals,

after

the

carrier

is

tuned

in,

merely

rotate

the function

switch

from

the

BFO

position

to

the

Receiver

position

which will

re-

sult

in

turning

off the

BFO

for

phone

reception.

If

interference

is

experienced

either

between

stations

close

to

one

another,

or

an

interfering

CW

signal,

turn

the Q multiplier

selectivity

control.

Gradually

advance

the Q

multiplier

selectiVity

control

which

will

result

in

increasing

the

selectivity

by

producing

a

spike

of

narrow

band width

that

is

adjustable

from

apprOXimately 3 kc to 100

cycles

in width.

This

spike

can

be

moved

around

within

the

IF

pass

band

that

is

nominally

apprOXimately 6 kc wige.

The

frequency

control

is

the

means

for

varying

the

position

of

this

spike.

Assuming

that

the

selectivity

control

is

ad-

jus

ted

to

produce a spike

1 kc wide and

also

ass

uming

that

the band width

of

the

IF

system

is

6 kc wide,

it

can

be

appreciated

that

the

shape

of the

IF

system

response

curve

can be

varied

by

moving

the

1 kc

band

width

anywhere

within the 6 kc band width.

This

will

produce a valley

on

either

side

of

the

spike

or

peak.

By

proper

tuning,

therefore,

of

the

band

spread

dial

and the

frequency

control

of

the Q multiplier,

it

should

be

apparent

that

an

interfering

signal

may

be

placed

in a

valley

and the

desired

signal

on the

peak,

with

the

net

result

of

decreasing

the

strength

or

elim-

inating

the

signal

that

is

in

the

valley,

without

seri-

ously

affecting

the

deSired

signal

intelligibility.

Since

the

use

of

the Q multiplier

naturally

means

narrower

band

Width, itshould

only

be

employed

when

interference

is

present.

Never

use

the Q multiplier

on

the

broadcast

band

unless

you

are

hunting

weak

DX

signals

and

are

therefore

not

after

maximum

fidelity

response.

The

same,

more

or

less,

applies

to

short

wave

broadcast

listening.

Here

the

use

of

the Q mul-

tiplier

in

addition

to functioning

as

previously

de-

scribed

may

also

prove

advantageous

from a noise

reduction

standpoint

as a direct

result

of

the

de-

creased

band width.

18

FREE DOWNLOAD

COURTESY OF N9SOR

WWW.HAMMARLUND.ORG

------------@

MEMORANDA

FREE DOWNLOAD

COURTESY OF N9SOR

WWW.HAMMARLUND.ORG

N

o

HAMMARLUND

MFG.

CO.

MODEL

NO.

HQ-IOOA-

MARS

HILL.

N.C

0

0

0

HF

€V

IF

OSC.@

e

MIX.

~

BFO

V5

6BA6

SBES

I-j

SC4

V4 Audio

Re~.

c::

'2AX7D

tJj

0

0

OOB

e

V6

IF

M

e e

E)tBis

t"'

Output

SBAS

o

SAQ5

D

0 0

(")

;J>

I-j

8DET-

LIM.-BFO

H

SBve

o

D

0

®

z

SPKR.

Meter

Zero

Fuse

3.2

OHMS

Phone

Adj

Ant.

@

1

01

e e

]0

(9)

01

e

<+>

881

0

PT.

2418-02-00006

FREE DOWNLOAD

COURTESY OF N9SOR

WWW.HAMMARLUND.ORG

- - - - - -

>R40

>22n

>

IW

p~~

JI *

VS

OUTPl:JT

6AC5

T8

30H~

5.~~2J:::::~IIr-

~

I

(S.~_::

6

.J,.

'-=-

~~-

2

A

_--,

C3SC-:::

R31

25UF-'-

430

IW

A

I

.OIUF

:

I,......."..

~

I 0 0 I

I::~I/')

~;;:::::

I

INN

I:l'

:l'

I

I

0<

< 0 I

I

~

> <

~

I

1'--

I

4~

I

L

....J

~

S

112

12AX7 _ 6

7 _

.....

l;;s

vvv

C56 r

AUDIO

350

I

.0T~~

::~~~

S5

IMEG.

,',

OFF

6

9 7

~

C36

~th-

-

:i

ON~~

R

21

- LIMITER

<

2.2K

(\

r+-4-----~--

5-_...,...L

I 2MEG.

Iqp

,=

.--'1'+-.3.JV\.

vvf\vr-

......

-",

I~

.-+----.

I

I r

I IMEG.IMEG.

7..

5

A

K

12P~

I

Z2

I

TVV

v

vv:

: I

'~IUF:

I

L

C35

I

-::::-

.OIUF

T7

:-------

--,

: a

~

i

,--

__

---l--.-------..

:~~~:

I I

I I

I I
L- -

-r

--~

2.2K

R2

S

10K

tJSENSITIVITY

-=-

R

35

- A A A

-;

>RI6

MI

00::

>2.2K

RI7

RI5 <

«w

01-

1600

+

o::W

200<

w::iE

IMA

N

T6

r-------.,

, I

:

~

a :

:::~g~~g:::

,

~

~;I

::;;;:C53 V6

• ~ __

--l

j

~15

~~

6:A6

C34

- R37

II

- A = 7

.OIUF

470K

-=~

C46

-f=.oJt;

J2

SEND

~7

fREe

~:

6:~

BFO r

~e____.-0:-F3----__+......,

4

~~,'

IK-

filS,>

AVC

M~

S4

.C

FRONT

I

C~6

J- CI9

I •

"""'TIlr-

I

~.OIUF

2

l-t;)

3000

~-

.....

--~.((~

.... --\\

C25

Cr,2

6f::--

V3

__

~.\\\'I.

u.·._

....

fL

~l

CIS

---

6C4

r--

~~

......

13--1~_0

.

·H-+-:-NI7<~;'

....

06...,SOO

7

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

?b~::~

V7A

V4B

213

6BVS

GRN

GRN

~

0(

,....

RED

3

J

V2 <VI

33 9 3

3

•

7

c

C3SAfc;r

60UF

40UF

3 4

V9

OB2

....J

~d

~'

/

~

= «

~

\"V7

~

(10

0.",

VB

5

V6

.,.

\!

.,.

))

>R39

.,.

>3.3

5W

"9

20

r--

...

----~

.

let

1\,

~

L4

~

II

IC24

C21

=1

~

1430

~'

I a I

'"

~II

I

C22

L

__

~",,\_J

"u

r--

"

I

dt

:

""-

~

"II

~23

=,L3

.......:"

I

~

I

r,j--+----.-t-+-+~~

I

ct

I

l~_~

I c

II

I

--'-- _

__.J

-==

SIC

REAR

"

r----+-I~

.l"~>--~

....

\ •

..;r---++--,

~o

~

---7---

--------7

~R36>R9

>IOJ\,~47K

'

5

~

I I

J

-=-

R

20

I

4K

v

lOW..

454

4

N01E:

L6

.!l!:!,:!.

~.

OHMS.

No.

39004

ZI

r-2-~/-

-3--

1

BlK/YEl

BLK/GRN

.....

BLK/RED

C43

±

,Oluf~

FI

j

C44

RESISTORS

ARE

1/2 W

AND

VALUE

IN

OHMS

UNLESS OTHERWISE

NOTED.

50/60~

CAPACITORS

ARE

IN

MICRO-MICRO FARADS UNLESS OTHERWISE NOTED.

TRIMMERS

CII

TO

CI3

AND

C20

TO

C23

ARE I

TO

9 MMF.

~

~

~.Oluf

5 4 4

AC

INPUT

_I~L_

-

-,-.~/

--7

,VC2F

..,~~57

}~C2E

}~IC

fig."

10.

H

••••rl••

"

HQ·,OOA

R,c,iver,

Scltematic

Diagram

FREE DOWNLOAD

COURTESY OF N9SOR

WWW.HAMMARLUND.ORG

__

!if.

-

-I~

1 T·5

T

r---

.

=

.bJ.I~~F

~!:;M~n~~~~

rC

-a--a-

-1

:

I

~

IlL

I I

~U:

"Q" I

C28

= I

i*6

~

..

=:I

I ',;r.. I V4A -

r<'l

I

V5

::=~

6~f6

,5

MULT.JP

I

3300

C2\~

I I 1/212AX7l I

I

6B:6,.:-_~,

6

I

/::~

S2

R~

~

.'1

~

I

rl

I

L

__

7H(r'~::-==~~'6

"

:6

.8

. 4

~.>510

12R'2

1

5

---

.JI

I

-.-

r

m~.:JJ

\'GL. ---

~JMEG.~

2

---

I

L

-

-.1-

-

~

I

C3'

I

zp

, .> -

7r

3 =

=

7

Hr

r----,

~

RI3

.OIUf

C31

R6·~O,~:=hc'0:=

•

10K

~

C30

180

.~

.O'UFI

SELECTIVITY

-.ej~

-=.E:-

"='~

=

.01

UF

~·~~t(F

::!:-

RI4

• R8 >R16
:

6.2K

•

2.2K

>2.2K

C45

fl~UFRI9

•

-

180>

"'---l--+--

C33-±-

•

04UF

:f:.

C5 _

C32..,!,o

.0IUF.,J

.0IUF~

R5

•• 22K

•

R3

10K

-::~

C8

SIC

FRONT

SIA FRONT SIB

FRONT

.01

UF

T

L-

...-----

....1

...-------eJ--l1..l

--------,

C

17

"'ML~I

~~~,~>--I--I

C50

2

...---_.:2

...

v""""","' -----,

R4

~

..d~~"""'"

'\

\.

_

.....

..

n._".........

__

--,

IK > = 100

~ll

..

3

5:_.f1\\

U

2.~

+

......4 \.,

./'" •

"""--4

\.'- A

.....

-+----,

N220

c

~~1;;--7""':"":-:"":-=l---+-+-+-""

~t~

~~'c;~~j~=1_~_~-+----,

~~

__

=~?-'"i'~'-f-=-""~---+--+-""

IT~

~

L2

~~

:

~=LJ_~

-~

~I:

L

__

~!-J

;;-='-=f.=o=l---+-..

L--+-~4~

~=-=_~=

~

=~

~.E:"

I\~

~

LI

lj

t :

iTt

~ ~ 3 ~

CI5

I

~

I ~

+-

_

~'

~II

I

....

.......

'-----i

.....

-i--.....-=-+-+-+-H--.. I

SIA REAR

~C6

OI~F

L._

-

.~

,IOIUF

.

.-------+-t-+-'

r-')~

...

~32

0:

~

~

SIBREARnq~·

~-+-+-'

..L--

=

.--

C7

.:r::..OIUF

,,----=7------------

....

----

- -

-----r---7--------------7-

·-€fL3

I

I

J

~;B._.

;~~A

~~~-

-~~3---

---

--~~~4~ -?V;:D-~~;C

--

)V~;--

--

--~k?:F-'

9.5TOzv IO.lTOlEl5;-

IIT0360 / 3.2T052

68NPO'

'" /

-==-

ANTENNA

FREE DOWNLOAD

COURTESY OF N9SOR

WWW.HAMMARLUND.ORG

THE

HAMMARLUND

MANUFACTURING

COMPANY

Standard

Warranty

The Hammarlund Manufacturing Company, warrants this equipment to

be

free from defects

in workmanship

and

materials under normal

and

proper use

and

service for

the

uses

and

purposes for which it

is

designed,

and

agrees

to repair

or

replace, without charge, all parts

thereof showing such defects which

are

returned for Inspection to

the

Company's factory,

transportation prepaid, within a period of

90

days

from

date

of

delivery, provided such Inspec-

tion discloses to the satisfaction of

the

Company

that

the defects

are

as

claimed,

and

provided

also,

that

the equipment

has

not been altered, repaired, subjected to misuse, negligence or

accident,

or

damaged

by lightning, excessive current

or

otherwise, or

had

its serial number

or

any

part

thereof altered, defaced,

or

removed. Tubes shall

be

deemed to

be

covered

by

the

manufacturer's

standard

warranty

applicable thereto,

and

such Items shall

be

and

are

hereby

excluded from the provisions of this warranty. Pilot lamps

and

fuses

are

not

guaranteed

for

length of service.

Except

as

herein specifically provided, no warranty, express or implied, other

than

that

of

title, shall

apply

to

any

equipment sold hereunder.

In

no event shall the Company

be

liable

for

damages

by

reason of

the

failure

of

the equipment to function properly

or

for

any

consequential

damages.

This

Warranty

Is

valid for

the

original owner of the equipment,

and

Is

contingent upon receipt

of the Warranty Registration Card by

the

Company. No equipment shall

be

returned to the

factory for repairs under

warranty

unless

wri"en

authorization

is

obtained by the Company,

and

the

equipment

is

shipped

prepaid

by

the

owner. The Company maintains Authorized

Service Stations, names

and

locations of which will

be

sent upon request of the owner.

The Hammarlund Manufacturing Company

A

Giannini

Sci.ntific

Co.

73·88

Hammarlund

Drive,

Mars

Hill,

N.

C.

Expo"

Departmant:

13

East 40th St,eet, New Yo,k 16, N.

Y.

Th.

policy

of

tha Hammarlu.... Manufacturing Campony, is

ona

of

continuad

improvemant in dooign

and

manufacture

wharever

and

whanaver possibla,

to

provida tha

higha.t

attainobla

quality a .... porformanca. Hanca, .pacifica-

tion., finishOl, ate.

are

subject

to

maltJa

without notice a .... without

a.sump-

tion

by

Hammarlund

of

any obligatIon

or

responsibility to provide

sum

features CIS may

...

manged,

odded

or

dropped

from previous production

runo

of

thi.

aqulpment.

Hammarlund

Manufacturing

Company

A Giannini Scientific Co.

73-88

Hammarlund

Drive.

Mars

Hill.

N.

C.

Export

Department:

13 East

40th

Str.et,

New

York

16,

N.

Y.

DO

NOT

MAKE

ANY

RETURNS

WITHOUT AUTHORIZATION FROM

THE

FACTORY.

ALL

AUTHORIZED

RETURNS

SHOULD

BE

SHIPPED

TO

HAMMAR-

LUND

MANUFACTURING CO.,

ATTN.

CUSTOMER

SERVICE,

MARS

HILL,

NORTH

CAROLINA.

FREE DOWNLOAD

COURTESY OF N9SOR

WWW.HAMMARLUND.ORG

---

-----~-----.-..~~~~----~~------~----

ESTABLISHED

r9ro

FREE DOWNLOAD

COURTESY OF N9SOR

WWW.HAMMARLUND.ORG