Hammarlund HQ-110A Istruzioni per l'uso e l'installazione

1

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HQ-110A

COM'MUNICATIONS

RECEIVER

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TECHNICAL

DESCRIPTION

AND

OPERATING

INSTRUCTIONS

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Hammarlund

Manufacturing Company

A Giannini Scientific Co.

53 West 23rd Street, New

York

10,

N.

Y.

Export Department: 13 East 40th Street, New

York

16,

N.

Y.

MANUAL

PART

NO,

41383-1

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TIlE

HQ-IIOA

COMMUNICATIONS

RECEIVER

INSTRUCTION

AND

SERVICE

INFORMATION

FOR RECEIVERS STARTING WITH SERIAL #8900

,

ESTABLISHED

1910

ISSUE I

In

order

to

receive

the

full

unconditional

gO-day

warranty

against

defective

material

and

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.

I

,-.

THE

HAMMARLUND MANUFACTURING

CO.

A GIANNINI SCIENTIFIC

CO.

53

West 23rd Street New

York

10,

N.

Y.

FREE DOWNLOAD

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m

Figure

J.

The HQ-JJ

OA

Communications

Receiver

TUBE

COMPLEMENT

Symbol

VI

V2

V3

V4

V5

V6

V7

V8

V9

VIO

VII

VI2

Type

6BZ6

6BE6

I2AX7

6BA6

6AZ8

6BJ7

6AQ5

6BZ6

6C4

OB2

5U4-GB

Tube

Pentode

Pentagrid

Converter

Pentagrid

Converter

Twin

Triode

Pentode

Triode-Pentode

Triple

Diode

Pentode

Triode

Gas

Filled

Diode

Twin

Diode

Function

RF

Amplifier

Mixer

Converter

Q-Multiplier,

First

AF

Amplifier

First

IF

Amplifier

Linear

Detector-Second

IF

Amplifier,

BFO

Detector, Noise

Limiter,

AVC

AF

Output

Crystal

Calibrator

Oscillator

HF

Oscillator

Voltage

Regulator

Rectifier

11

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-

INTRODUCTION

The

Hammarlund

HQ-110A

is

an

all-new

amateur

communications

receiver

representing

entirely

new

concepts

in

electrical

and

mechanical

design.

It

will

provide

years

of

top

performance

with

minimum

maintenance.

The

HQ-110A

has

a

self-contained

power

supply

operating

from

a

60

cps,

105-125

volt

AC

source.

Power

consumption

is

80

watts.

The

Hammarlund

HQ-110AC

incorporates

a

telechron

automatic

electric

clock-timer

in

its

design.

The

ex-

port

model,

HQ-llOAE,

now

available,

will

operate

from

a

50

or

60

cps,

115-230

volt

AC

source,

5ee

Fig-

ure

13

for

Wiring

Instructions.

The

HQ-110A

is

a

superheterodyne

receiver

with

a

frequency

coverage

of

the

amateur

bands

as

follows:

160

meter

band,

1.8

to

2.0

mc,

calibrated

in

5

KC

divisions.

30

meter

band,

3.5

to

4.0

mc,

calibrated

in

5

KC

divisions.

40

meter

band

7.0

to

7.3

mc,

calibrated

in

5

KC

divisions

20

meter

band,

14.0

to

14.4

mc,

calibrated

in

5

KC

divisions

IS

meter

band,

21.0

to

21.6

mc,

calibrated

in

10

KC

divisions.

10

meter

band,

23.0

to

30.0

mc,

calibrated

in

20

KC

divisions.

6

meter

band,

50.0

to

54.0

mc,

calibrated

in

50

KC

divisions.

A 2

Meter

scale

is

provided

for

use

with

a

converter

which

has

an

output

in

the

6

meter

band.

Double

conversion

is

employed

for

the

40, 20,

IS,

10

and

6

meter

bands.

A

single

control

provides

extremely

fine

tuning

for

the

separation

of

crowded

signals.

A

very

high

sig-

nal-to-noise

ratio,

plus

the

famous

Hammarlund

noise

limiter

circuit,

permits

full

use

of

the

receiv-

er's

excellent

sensitivity

on

the

weakest

signal.

A

Q-Multiplier

is

provided

for

varying

the

selectivity

of

the

receiver.

A

new

audio

output

circuit

feature

is

the

Auto-Re-

sponse,

which

automatically

narrows

and

widens

the

frequency

range

of

the

audio

output,

according

to

the

gain

required.

This

feature

permits

higher

fidel·

ity

reception

on

stronger

signals,

while

providing

the

sharp

cutoff

required

in

receiving

communica-

tions

under

adverse

conditions.

A

second

advantage

of

the

Hammarlund

Auto-Response

is

the

rapid

damping

of

the

audio

power

in

the

speaker

voice

coil

which

greatly

minimizes

undesirable

speaker

"hangover."

The

receiver

may

be

used

with

either

speaker

or

headphones.

Fast

acting

A

VC

maintains

a

constant

audio

level.

Adequate

filtering

practically

eliminates

AC

power

ripple.

The

HQ-110A

is

equipped

with

a

stable

beat

fre-

quency

oscillator

which

provides

the

operator

with

a

continuous

range

of

audio

tones

when

receiving

telegraphic

code

signals.

When

used

in

conjunction

with

the

Q-Multiplier,

single

signal

reception

is

assured.

A 100

KC

crystal-controlled

oscillator

is

incorpor-

ated

to

provide

100

KC

check

points

for

precise

cali-

bration

on

all

seven

bands.

A

linear

detector

is

provided

for

the

optimum

re-

ception

of

55B

and

CW

signals.

An

"5"

.meter

is

provided

to

obtain

accurate

read-

ings

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

greatest

operating

ease.

The

new

futur-

istic

front

panel

is

clearly

marked

to

permit

full

at-

tention

to

the

operation

at

hand.

The

HQ-110A

was

designed

with

you

in

mind.

Y

ou'II

have

many

hours

of

pleasure

and

use

in

operating

this

truly

fine

communications

instrument.

1

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In

~

75FT

OVERALL--

RECEIVER

A

Figure 2. Installation

of

Single-wire

Antenna

NOTE: I.

INNER

CONDUCTOR

TO

= SHIELD

TO

SHELL

OF

PWG

2.

WHEN

USING

6 METER COAXIAL CABLE,

OPEN

LINK BETWEEN

"6M"

AND

UNMARKED

TERMINAL.

Figure

3.

Installation

of

Folded Dipole

Antenna

2

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------------0

INSTALLATION

UNPACKING

Unpack

the

receiver

carefully.

Make

sure

the

tubes,

associated

tube

shields

and

pilot

lamps

are

in

place.

SPEAKER

CONNECTION

Connect

a 3.2

ohm

permanent

magnet

dynamic

speaker

(Hammarlund

S-100

Speaker)

to

the

two

terminals

marked

SPKR.

on

the

rear

of

the

chassis.

(Note

Figure

4.)

For

best

performance

do

not

place

speaker

on

top

of

receiver

cabinet.

POWER CONNECTIONS

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-IIOA

is

designed

to

operate

with

a

single

wire

or

a

balanced

type

antenna.

The

front

panel

antenna

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

the

one

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:

468

Length

(feet)

Freq.

MCS

Each

half

(

1/4

wave

length)

is

half

the

length

found

from

the

above

formula.

A

one-half

wave

dipole

can

be

used

on

6

meters

but

a

commercial

beam

will

perform

better.

A

separate

coax

socket

input

is

provided

for

6

meters.

The

terminal

strip

may

also

be

used

as a

separate

6

meter

input.

In

either

case

the

jumper

must

be

removed

from

across

the

6

meter

antenna

terminal

strip.

If

the

jumper

is

left

in

place

and

only

a

low

frequency

antenna

connected

to

the

normal

input

terminals

this antenna

will

be

in

the

circuit

on

the

6

meter

position.

A

socket

J3

is

provided

on

the

rear

skirt

for

power-

ing

a

preamplifier

such

as

the

Ameco

model

#PV

50

meter

preamplifier.

Refer

to

the

schematic

dia-

gram

for

wiring

information.

Where

a 6

meter

pre-

amplifier

is

used

the

input

should

be

to

the

6

meter

antenna

connector

or

strip

with

the

link

open.

POWER

SOCKET

RATINGS:

6.3 V @ .15

amperes

250 V @ 15

Milliamperes

When

using

plug-in

Silicon

Rectifier

Part

No.

PL

39143-GI:

6.3V @

.5

Amperes

250 V & 30

Milliamperes

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.

,...-..

o

SPEAKER

32

OHMS PHONE

METER

ZERO

ADJUST PRE-AMP

POWER ANTENNA EXT

RELAY

o

3

Figure

4.

Connection Points

at

Rear

of

Chassis

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1-1

1 2

13--"';"'---

12

---~---!!i!.o=:!

!!::!::::i!+--

3

INDEX

NO.

2

3

4

5

6

7

11

10

CONTROL

CAL

SET

Control

"s"

Meter

(Carrier

Level)

FREQ.

Control (Q-MultipIier)

SELECTIVITY

Control (Q-MultipIier)

FUNCTION

Switch

AUDIO

GAIN

Control

LIM

Switch (Noise

Limiter)

98

INDEX

NO.

8

9

10

11

12

13

14

76 5

CONTROL

TUNING

RANGE

Switch

(Band

Selector)

MAN-AVC Switch

SENSITIVITY

Control

TUNING

Control

ANTENN

A

Trimmer

CW

PITCH

Control

(Beat

Frequency

Oscilla-

tor)

Telechron

Automatic

Clock

(Timer)

Figure

5.

Location

of

Controls

4

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OPERATION

AM

RECEPTION

For

AM

reception

the

position

of

the

controls

should

be

as

follows:

FUNCTION

Switch

_._

Receive

(REC)

TUNING

RANGE

Switch

..

5et

to

desired

frequency

range

MAN

- A

VC

Switch

__

_ AVC

FREQ.

Control

_

Set

pointer

to

triangular

marker

CAL

SET

Control

.Set

to

vertical

marker

LIM

Switch

_

As

required

TUNING

Control

_

Tune

for

highest

"s"

meter

reading

on

signal

ANTENNA

Trimmer

Tune

for

highest

"s"

meter

reading

on

signal

SELECTIVITY

Control

Fully

counter-

clockwise*

SENSITIVITY

Control

._

Fully

clockwise**

AUDIO

GAIN

Control

_._

Adjust

for

required

level***

*Normally

for

AM

reception,

the

Q-Multiplier

is

switched

OFF

(fully

counterclockwise)

for

maximum

bandwidth.

However,

the

Q-Multi-

plier

may

be

useful

in

eliminating

interference

from

closely

adjacent

signals

at

some

sacrifice

in

the

fidelity.

The

bandwidth

is

narrowed

by

clockwise

rotation

of

the

SELECTIVITY

con-

trol

**For

normal

AM

reception,

the

SENSITIVITY

control

is

fully

clockwise.

The

"s"

meter

calibra-

tion

holds

only

in

this

position

on

A

VC

opera-

tion.

In

the

presence

of

extremely

strong

signals,

the

SENSITIVITY

control

may

be

reduced

to

prevent

overloading.

***

A

feature

of

the

audio

system

is

the

variable

negative

feedback

employed.

Maximum

feed-

back

is

provided

at

low

settings

of

the

AUDIO

GAIN

control

for

the

best

quality

reception

of

strong

signals. As

the

AUDIO

GAIN

control

is

increased,

the

feedback

decreases

so

that

on

re-

ception

of

weak

signals

additional

selectivity

is

provided

by

the

audio

system.

This

results

in

an

increased

signal-to-noise

ratio.

A

further

advan-

tage

is

the

critical

damping

of

the

speaker

for

elimination

of

speaker

"hangover."

This

up-

grades

the

reception

of

speech

and

decreases

the

noise

output

of

the

receiver.

A

further

advantage

is

the

reduction

of

distortion

at

low

settings

of

the

AUDIO

GAIN

control.

CODE

SIGNAL

RECEPTION

For

CW

code

reception

the

position

of

the

controls

should

be

as

follows:

FUNCTION

Switch

__

_CW-SSB

TUNING

RANGE

Switch

_Set

to

desired

frequency

range

MAN

- A

VC

Switch

_

MAN

FREQ.

Control

_

Set

pointer

to

triangular

marker*

CAL

SET

Control

5et

to

vertical

marker

CW

PITCH

Control

__

Pointer

on

tri-

angular

marker

for

zero

beat

tuning

and

then

offset

either

left

or

right

for

desired

pitch

TUNING

Control

__

Tune

for

zero

beat

ANTENNA

Trimmer

..

.....

_Tune

for

maximum

response

SELECTIVITY

Control

"ON"

and

advanced

as

required

**

SENSITIVITY

Control

Adjust

for

desired

output

level

AUDIO

GAIN

Control

_

Clockwise

to

12

or

2

o'clock

position

*The

FREQ.

control

will

peak

the

selectivity

curve

to

the

left

or

right

over

the

pass

band

of

the

IF

amplifier

permitting

a

high

degree

of

the

control

of

selectivity

for

closely

adjacent

interfering

signals.

**The

broadest

position

of

the

SELECTIVITY

control

(corresponding

to

a 6

db

bandpass

of

3

KCS)

is

with

the

control

turned

clockwise

just

sufficiently

to

operate

its

switch.

This

puts

the

Q-Multiplier

in

operation.

Further

clockwise

rotation

of

the

control

narrows

the

bandwidth

until

a

position

is

reached,

just

short

of

oscilla-

tion,

where

the

bandwidth

is

of

the

order

of

100

cycles.

The

control

should

be

adjusted

below

the

point

of

oscillation

and

to

the

desired

band-

width

as

required

by

interference.

SSB

RECEPTION

For

SSB

reception

the

position

of

the

controls

should

be

as follows:

FUNCTION

Switch

_ _ CW-SSB

TUNING

RANGE

Switch

_.5et

to

desired

frequency

range

MAN-A

VC

Switch

_

__

.MAN

FREQ.

Control

__

Set

pointer

to

triangular

marker

CAL

SET

Control

Set

to

vertical

marker

5

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IIi

TUNING

Control

Tune

for

maximum

clarity

ANTENNA

Trimmer

.Tune

for

maximum

response

SELECTIVITY

Control

_

"ON"

but

not

advanced

beyond

switch

*

SENSITIVITY

Control

_

As

required

**

AUDIO

GAIN

Control

Clockwise

to

12

or

2

o'clock

position

****

CW

PITCH

Control

_

Approximately

1

division

left

or

right****

*The

SELECTIVITY

control

should

only

be

advanced

beyond

the

switch

"ON"

position

if

required

to

increase

the

selectivity

due

to

interference.

**The

SENSITIVITY

control

should

be

advanced

only

sufficiently

to

provide

the

required

output.

The

use

of

a

minimum

SENSITIVITY

control

setting

insures

that

no

overload

distortion

oc-

curs

in

the

receiver.

***Operating

with

the

AUDIO

GAIN

control

advanced

1/2

to

2/3

rotation

insures

sufficient

power

output

while

permitting

the

reduced

SENSITIVITY

operation

described

above.

****The

CW

PITCH

control

is

set

approximately

1

division

to

the

right

or

left

of

the

triangular

marker,

depending

on

whether

the

upper

or

the

lower

side

band,

respectively,

is

transmitted.

The

CW

PITCH

control

is

adjusted

for

maxi-

mum

clarity,

once

the

signal

has

been

tuned

in.

There

will

be

a

correct

setting

of

this

control

for

each

sideband

and

once

these

two

settings

are

determined,

they

should

be

noted

for

future

use

in

SSB

reception.

CALIBRATE

For

dial

calibration

checking,

the

FUNCTION

switch

is

set

at

the

CAL

position

and

the

other

COH-

troIs

should

be

set

as

listed

under

CODE

SIGNAL

RECEPTION.

The

receiver

is

aligned

with

the

CAL

SET

control

set

at

the

vertical

marker

and

should

be

closely

correct.

The

CAL

SET

control

is

used

to

accurately

reset

the

dial

indicator

lines

if

they

are

found

to

be

slightly

off

calibration

at

any

point

on

the

dials

where

correct

calibration

is

desired.

The

receiver

is

tuned

to

produce

a

zero

beat

response

with

the

PITCH

control

set

at

the

triangular

marker,

on

any

100

KCS

multiple

in

the

desired

band.

The

CAL

SET

control

is

then

used

to

reset

the

dial

indicator

to

the

correct

marker.

If

the

dial

calibration

should

be

foun-d

to

be

beyond

the

range

of

the

CAL

SET

control,

the

HF

Oscillator

will

re-

quire

readjustment

(see

under

SERVICE

AND

RE-

ALIGNMENT)

.

On

switching

from

the

CW-SSB

position

to

the

CAL

position,

an

increase

in

level

will

be

noticed.

This

is

done

deliberately

to

provide

additional

gain

for

the

higher-order

harmonics

of

the

100

KCS

crystal

calibrator,

regardless

of

whether

the

receiver

is

in

MAN

or

A

VC

position.

Note

As

only

the

amateur

bands

are

covered

by

this

receiver

it

is

not

possible

to

compare

the

100

KCS

freq.

calibrator

against

WWV.

The

100

KCS

crystal-controlled

oscillator

has

been

accurately

set

at

the

factory.

This,

plus

the

fact

that

a

very

low

drift

.005%

crystal

is

employed,

will

insure

sufficient

accuracy

for

all

practical

purposes.

For

those

who

desire

frequency

ac-

curacy

of

the

crystal

calibrator

in

the

order

of

cycles,

the

procedure

outlined

on

Page

14

should

be

employed.

EXTERNAL

RELAY

CONNECTION

A

standard

power

receptable

is

provided

on

the

rear

apron

of

the

chassis

for

the

connection

of

an

ex-

ternal

relay-operated

switch.

This

receptacle

accom-

modates

a

standard

power

plug

and

when

so

used

the

SEND

position

of

the

FUNCTION

SWITCH

is

not

used.

A

jump~r

plug,

provided

for

normal

without

relay

switching,

is

removed

from

the

recep-

tacle

when

using

the

relay

switching.

The

usual

antenna

change-over

relay

equipped

with

a

set

of

normally

closed

contacts

is

suggested.

The

choice

of

this

relay

will

depend

on

the

particular

antenna

system

involved,

such

as

whether

a co-ax

relay

or

one

for

open

wire

line

is

employed.

In

either

case

the

extra

set

of

contacts

to

control

the

receiver

will

be

necessary.

TELECHRON

AUTOMATIC

CLOCK-TIMER

If

your

receiver

is

equipped

with

the

built-in

Tele-

chron

Automatic

Clock-Timer,

the

following

in-

structions

should

be

noted:

Every

radio-frequency

device

is

stable

only

at

pre-

determined

operating

temperatures.

In

order

to

eliminate

waiting

for

the

receiver

to

warmup

to

operating

temperature,

the

Telechron

Timer

auto-

matically

turns

on

the

receiver

ahead

of

anticipated

operating

time.

This

is

accomplished

by

setting

the

6

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hand

of

the

timer

(small

knob

at

rear

of

receiver)

to

approximately

one-half

hour

before

operating

time.

The

front

panel

control

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"

and

turn

the

knob

to

set

the

switch

timing

hand

and

"pull

out"

and

turn

the

knob

to

set

the

clock

hands.

The

front

switch

is

set

to

AUTO

and

the

function

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

function

switch

normally,

the

clock

switch

should

be

left

in

the

ON

position.

The

clock

will

continue

to

run

as

long

as

the

re-

ceiver

line

cord

is

connected

to

the

power

outlet,

and

is

extremely

useful

for

checking

sign-in

periods

and

schedules.

If

your

receiver

is

not

equipped

with

the

standard

Telechron

Automatic

Clock-Timer,

and

you

would

care

to

have

the

accessory

added,

The

Clock

Kit,

with

full

installation

instructions,

may

be

pur-

chased

from

your

local

Hammarlund

dealer.

Instructions

for

connecting

the

standard

clock·timer

are

as

indicated

in

figure

12.

The

Export

Model

Clock-Timer

HQ-110AE

is

now

available

from

your

local

Hammarlund

Dealer.

This

automatic

Clock-Timer

will

operate

from

a 50-60

CPS,

115-230

Volt

AC

source.

Instructions

for

con-

necting

the

export

model

Clock-Timer

are

as

indi-

cated

in

Figure

13.

CIRCUIT THEORY

The

HQ-110A is a

superheterodyne

receiver

cover-

ing

the

6, 10, 15, 20, 40,

80.and

160

meter

amateur

frequency

bands.

Double

conversion

is

employed

in

the

6

through

40

meter

bands.

Twelve

tubes

are

used,

including

the

Rectifier

and

Voltage

Regulator

of

the

self-contained

power

supply.

The

circuitry

of

the

receiver

includes

a 100

KCS

crystal

calibrator,

a

Q-Multiplier

for

full

control

of

selectivity,

an

effec-

tive

noise

limiter

and

a

separate

highly

stable

Beat

Frequency

Oscillator.

PRESELECTION

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

capacitor,

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

in-

dependent

oscillator

(6C4),

VI0.

The

output

signal

from

RF

amplifier,

VI,

is

hetero-

dyned

with

the

output

of

the

local

high

frequency

oscillator,

VlO,

and

electronically

combined

within

the

mixer

tube,

V2.

On

the

80

and

160

meter

bands,

the

local

oscillator

is 455

KCS

above

the

signal

frequency.

On

the

10

to

40

meter

bands,

the

local

HF

Oscillator

is 3035

KCS

above

the

signal

fre-

quency.

On

the

6'meter

band,

the

local

HF

Oscilla-

tor

is 3035

KCS

below

the

signal

frequency.

When

operating

in

the

6

to

40

meter

bands,

the

dif-

ference

frequency

of

3035

KCS

is

heterodyned

with

the

output

of

the

2580

KCS

crystal

controlled

oscil-

lator

and

electronically

combined

within

the

con-

verter

tube,

V3,

to

produce

the

455

KCS

final

inter-

mediate

frequency.

Low-loss

tube

sockets,

low-loss

phenolic,

temperature

compensating

capacitors,

and

stable,

coaxial

glass

trimmer

all

contribute

to

oscillator

stability.

Addi-

tional

frequency

stability

is

attained

by

applying

regulated

voltage

to

the

oscillator

circuit

and

by

the

rugged

construction

of

the

entire

HF

oscillator

sec-

tion

assembly.

Q·MULTIPLIER

The

Q-Multiplier

circuit

employed

in

this

receiver

provides

a

means

of

peaking

any

signal

within

the

pass

band

of

the

IF

amplifier.

The

degree

of

peak-

ing

is

controlled

by

the

SELECTIVITY

control.

The

bandwidth

varies

from

3

KCS

with

the

SELECTIV.

ITY

control

switch

just

"ON"

to

approximately

100

7

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