Hallicrafters HT-32A Manuel de formation

Autres manuels pour HT-32A

1

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a

|

oes

2

eee

the

hallicratters

co.

MANUFACTURERS

OF

ELECTRONIC

EQUIPMENT,

CHICAGO

24,

U.S.

A.

%

092-i03923

Figure

I.

Hallicrafters

Model

HT-32A

Transmitter/Exciter

SECTION

I

GENERAL

1-1,

DESCRIPTION,

The

Hallicrafters

Model

HT-32A

Transmitter/

Exciter

is

the

ultimate

in

design

of

self-contained

trans-

mitting

equipment.

This

twenty-tube

precision

built

transmitter/exciter

is

capable

of

SSB

(single

sideband

with

suppressed

carrier),

DSB,

and

CW

transmission

in

the

80,

40, 20,

15,

and

10

meter

bands,

This

unit

canrepres

ent

the

complete

transmitting

complement

of

any

amateur

station.

The

only

requirements

for

im-

mediate"'on

the

air"

operation

area

50-ohm

terminated

antenna

system,

key

or

microphone,

and

AC

power

source.

1-2.

SCOPE

OF

OPERATION.

This

unit

may

be

utilized

as

a

complete

self-

contained

transmitter,

or

as

an

exciter

for

a

linear

power

amplifier

such

asthe

Haliicrafter

Model

HT-33A.

if

other

linear

amplifiers

are

employed,

they

should

be

capable

of

supplying

a

50-ohm

termination

to

the

driver

output

to

utilize

the

full

capabilities

of

the

HT-

32A

Transmitter/Exciter.

Maximum

power

output

ratings

of

the

HT'-32A

Transmitter

/Exciter

are:

SSB,

70-100

watts

P.E.P.

(peak

envelope

power);

cw

70-100

watts;

and

DSB

17-25

watts

(carrier

power).

Prominent

features

of

the

HT-32A4

Transmitter/

Exciter

are;

@

New

high

frequency

crystal

sideband

filter

-

rejection

50

db.

or

more.

®

Bridged-tee

sideband

modulator.

@

C.T.O,

direct

reading

in

kilocycles

to

less

than

300

cycles

from

reference

point.

144

watts

plate

input

(P,

E.

P.

two-tone).

Five

band

output

(80,

40,

20,

15,

10

meters),

Unwanted

sideband

down

50

db,

or

more.

Distortion

products

down

30

db.

or

more

Sie

Biel

el

Poets

anne

We

Carrier

suppression

down

50

db.

or

more,

1-3,

T.V.1,

(Television

Interference)

SUPPRESSION.

The

HT-32A

Transmitter/Exciter

has

been

designed

and

constructed

to

suppress

spurious

radiations

that

may

cause

television

interference.

The

TVI

problem

was

given

full

consideration

in

the

design

of

every

cir-

cuit

as

well

as

in

the

selection

and

layout

of

parts.

Adequate

filtering

has

been

provided

for

control

cir-

cuits

aud

AC

power

lines.

Components

were

specifi-

cally

selected

to

avoid

undesired

resonances

and

ar-

ranged

to

prevent

parasitic

oscillation,

Another

important

T.

V.I.

proofing

feature

is

em-

ployed

in

the

output

coupling

circuit

of

the

final

ampli-

fier,

The

tuned

output

circuit

is

api

network

that

has

inherently

excellent

harmonic

suppression

ability.

The

unique

design

of

this

network

is

such

that

the

conven-

tional

loading

control

is

unnecessary

and

only

the

final

tank

tuning

need

be

adjusted.

The

pi

network

is

cor

nected

to

a

coaxial

connector

and

permits

the

use

of

any

antenna

system

having

a

transmission

line

im-

pedance

of

SO

ohms,

In

additian

to

these

fartare

In

et

ed

he

ee,

eT

MAL

EARLE

RL

ALFA

LAY

LA

saws

¥

ain

stalled

precautions,

a

commercial

50-cohm

low

pass

TVi

filter,

which

connects

between

the

antenna

andthe

transmitter

/exciter

output,

can

be

used,

The

Model

HT-32A

Transmitter/Exciter,

as

re-

ceived

from

the

factory,

has

had

every

advantage

of

Hallicrafters

advanced

engineering

to

minimize

tele-

There

are,

however,

some

tynes

of

TVI

that

cannot

be

prevented

within

the

transmitter

itself.

For

example,

when

a

television

receiver

is

located

in

the

immediate

vicinity

of

the

transmitter/

exciter

itis

entirely

possible

that

a

fundamental

signal

will

reach

the

input

grid

of

the

receiver

in

sufficient

strength

to

cause

a

slight

amount

of

interference.

in

vision

interference.

such

cases,

it

will

be

necessary

to

install

a

filter

or

trap

at

the

television

receiver

to

attenuate

the

trans-

mitter's

fundamental

signal.

if

the

interlering

signal

does

not

enter

the

television

receiver

through

the

an-

tenna,

special

shielding

or

filters

on

the

TV

receiver

may

be

necessary.

For

a

more

complete

discussion

of

measures

that

may

be

used

to

handle

these

special

television

interference

problems,

refer

to

the

ARRL

HANDBOOK.

SECTION

I!

INSTALLATION

2-1.

UNPACKING.

After

unpacking

the

HT-32A

Transmitter/Exciter,

examine

it

closely

for

any

possible

damagt

which

may

have

occurred

during

transit,

Should

any

sign

of

dam-

age

be

apparent,

fileaclaimimmediately

withthe

car-

rier

stating

the

extent

of

damage,

Carefully

check

ail

shipping

labels

and

tags

for

any

speciaj

instructions

before

removing

or

destroying

them,

2-2,

LOCATION.

Although

the

Model

HT-32ATransmitter/Exciter

is

provided

with

4

built-in

power

driven

fan

for

cooling

purposes,

avoid

excessively

warm

locations

such

as

those

near

radiators

andheating

vents.

The

unit

should

be

placed

ina

location

that

provides

adequate

space

around

it,

permitting

free

circulation

of

air

through

the

cabinet

openings.

2-3.

POWER

SOURCE.

The

HT-32A

Transmitter/Exciter

is

designed

to

operate

on

105

to

125

volt,

50-60

cycle

AC

current,

power

consumption

is

375

watts,

JIMPORTANT:

If

in

doubt

about

your

power

Source,

contact

your

local

power

company

prior

to

inserting

the

power

cord

into

an

AC

power

outlet,

Plugging

the

power

cord

into

the

wrong

power

source

can

cause

extensive

damage

to

the

unit,

requiring

costly

repairs.

2-4.

FRONT

PANEL

CONNECTIONS

(See

Fig.

1).

Receptacies

are

provided

on

the

front

panel

of

the

HT=32A

Transmitter/Exciter

for

the

following

pur-

poses:

2-4-1.

MIKE

RECEPTACLE.

The

Model

HT-32A

Transmitter/Exciter

is

designed

to

operate

with

a

high

impedance

communications

type

microphone,

The

microphone

cable

should

be

fitted

with

an

Amphenol

type

80-MC2M

connector

and

should

be

wiredas

shown

in

the

schematie

diagram,

Figure

14,

Tf

the

microphone

used

does

not

have

a

push-to-talk

switch,

the

switch

circuitry

may

be

disregarded

and

the

microphone

connected

between

pin

1

and

the

shield

(connector

body),

2-4-2,

KEY

JACK.

This

standard

two-conductor

phone

jack

is

provided

on

the

front

panel

for

hand

key

or

''bug"

operation.

The

KEY

jack

accepts

a

general

purpose

standard

two-con-

-o°

ductor

phone

plug,

Connections

ior

keying

are

also

provided

on

the

Control

Outlet

receptacle

on

the

rear

panel,

See

paragraph

2-5-2-2.

Wire

the

plug

so

that

the

key

base

is

connected

tothe

sleeve

of

the

plug

which

is

also

at

chassis

ground.

*

2-4-3.

MONITOR

JACK.

This

standard

two-conductor

phone

jack:

permits

yoice

controlled

headphone

reception

in

the

VOX

mode

of

operation.

The

MONITOR

jack

accepts

a

general

purpose

two-conductor

phone

plug.

inserting

the

plug

of

a

headset

into

this

jack

will

automabicay

cut

off

the

receiyer

speaker

connected

as

instructed

in

paragraph

2-5-2-4,

receiver

sneaker

whenit

is

2-5.

REAR

CHASSIS

CONNECTIONS

{See

Fig.

2).

Sockets

are

provided

on

the

rear

of

the

HT-32A

Transmitter/Exciter

for

the

following

purposes:

2-S-1.

RF

OUTPUT,

This

is

&2coaxial

connector

which

connects

the

HT-

32A

Transmitter/Execiter

to

the

antenna

system

or

a

linear

amplifier.

The

connecting

cable

(52

ohm

coax,

)

should

be

fitted

with

an

Amphenol

type

83-15P

connector

or

its

equivalent.

The

selection

of

the

type

of

antenna

and

coupling

will

depend

upon

the

frequencies

used

and

the

purpose

of

operation,

Refer

tothe

ARRL

ANTENNA

HANDBOOK

for

detailed

infor

mgtion

concerning

trans-

mitting

antennas.

2-5-2.

CONTROL

OUTLET.

An

eleven

pin

socket

is

provided

at

the

rear

of

the

chassis

to

connect

the

HT-32A

Transmitter

/Exciter

into

your

control

system.

The

mating

connector

for

this

socket

isan

Amphenol

86-PMil.

‘The

instructions

which

follow

may

be

modified

to

suit

your

particular

needs,

2-5-2-1,

ACCESSORY

RELAY

CONTACTS

{Pins

6

and

7).

Two

extra

relay

contacts

working

against

chassis

ground

(Relay

arm

grounded,

contacts

connected

to

pins

-6

and

7)

are

available

for

applications

where

a

closed

circuit

tochassie

is

required

in

either

the

trans-

mit

or

receive

condition,

When

transmitting

pin6is

at

chassis

groundandpin

7

is

opencirevit,

During

stand-

ioe

SAUER

Le

Sets

a

pes

SUPT

ell

oe

by

or

receive

periods,

pin

6

is

open

circuit

and

pin

7

is

atchassis

ground.

See

Figure

3

for

a

typical

appli-

catiou,

GROUNO-RECEIVE

{

RELAY

_7

RELAY

CONTACTECPEN

CIRCUIT-RECEIVE

-

OPEN

CIRCUIT~TRANSMIT

[CONTACT

;

|

GROUND

-

TRANSMIT

Biot

5

-|OO¥

BIAS

(HIGH

IMPEDANCE)

KEY

CONNECTION

ee

[

9

.

IF

PANEL

JACK

IS

NOT

USED

GROUND

$0

OHM

POWER

FSR

JACK

RF

OUTPUT

corp

er

—

©

@

woe

CONTROL

OUTLET

To

FUSE

4AMPS

RECEIVER

|

GROUND

To

SPOT

$LO-9LO

OUTPUT

vOx

RELAY

CONTACTS

AC

OUTLET

if

CONTACT

RATING

2

AMP.

MAX,

ro

DAMP

@

ey

{ACCESSORY}

SPEAKER

1

crounp

«/_—_.___]

Figure

2.

Rear

Chassis

Connections

8x~-100

$X~101

TO

GRID

RETURN

OPERATING

RECEIVE

STAND-BY

Blas

s0JUST

SWITCH

IN

STAND-BY

POSITIGN

VOX

RELAY

STAND-8Y

PLATE

SHOWN

IN

RECEIVE

TYPICAL

CURRENT

ADJUST

FRONT

POSITION

POWER

4MPL.

PANEL

(INTERNAL

TO

SET}

1

Wak

NC

me

J

RF

GAIN

NOTE:

=

SET

FOR

DESIRED

LEVEL

UNITS

MUST

BE

BONDED

TO

COMMON

USE

HEACPHGNE

JACK

:

WHEN

MONITORING

CW

GROUND

SYSTEM

FOR

OC

RETURN.

TRANSMISSION

WHEN

RECEIVER

15

WIRED

FOR

¥OX

OPERATION

—

1

DAS

RECEIVER

H

TO

ANTENNA

|

&——o—

me

TO

TRANSMITTER

PN

exrenuan

ANTENNA

CHANGE

OVER

RELAY

usar

ART

Sti:

ce

my

GUPPLICUS

NOTE:

SAFETY

INTERLOCK

FEATURE

MAYSE

USED

iF

ANTENNA

RELAY

HAS

EXTRA

CONTACTS.

To

+300

ve

¥OX

RELAY

RY!

Lf

i

i

|

TO

PLATE

OF

|

|

|

TG

FINAL

AMPL

CONTROL

RELAY

TUBE

(GENERALLY

BAS

LEVEL

CHANGE]

VITB

TO

EXTERNAL

|

POWER

SOURCE

|

__

_I

SEEanianieantnenieneeteetaenen

ost.

505

7a5

Figure

4,

Control

Outlet

Relay

Connections

4.

2-5-2-2,

KEY

(Pins

8

and

9}.

For

CW

operation,

the

hand

key

or

“bug”

is

con-

nected

to

pins

8

and

9

of

the

control

outlet.

Pin

9

is

internally

grounded

in

the

unit.

When

the

key

is

up,

cutoff

bias

is

maintainedat

the

secondand

third

mixer

stage.

Closing

the

key

removes

the

cutoff

bias

pro-

viding

signal

excitation

to

the

succeeding

RF

amplifier

Stages,

A

key

jack

is

also

provided

at

the

front

panel

for

those

who

prefer

a

panel

connection

for

the

key.

2-5-2-3.

ANTENNA

RELAY

(Pins

2,

3

and

4).

An

external

antenna

change-over

relay

may

be

em-

ployed

by

utilizing

pins

2, 3,

and

4

on

the

control

out-

let.

These

pins

are

connected

internally

to

insulated

contacts

on

the

VOX

RELAY

of

the

HT-32A

Trans-

mitter/Exciter.

Figure

a

illustrates

typical

con-~

trol

outlet.

During

periods

of

transmission

the

vOX

relay

connects

pins

24nd

3

enabling

the

external

power

source

to

activate

the

external

antenna

change-over

relay,

Forexternal

applications

where

anopen

circuit

is

required

when

transmitting,

pins

3

and

4

may

be

used,

The

voltage

required

of

the

external

source

is

dependent

upon

the

type

change-over

relay

used.

A

coaxial

type

relay

for

50-ohm

transmission

line

impedance

is

recommended.

Where

pins

2,

3,

and

4

areused

to

switch

external

equipment

loads,

the

load

current

should

be

limited

to

one

ampere.

power

2-5-2-4.

RECEIVER

AUDIO

(Pins

9

and

10}

AND

SPEAKER

(Pins

1

and

11).

Connect

the

audio

output

of

the

station's

receiver

di-

rectly

to

pins

9

and

10

of

the

control

outlet,

(Pin

9

is

ground

or

chassis

side.)

Comect

a

2

watt

resistor

across

the

receiver

audio

output

to

maintain

a

load

at

ali

times.

The

receiver

speaker

is

connected

directly

to

pins

land

11.

(Pin

1

is

ground

side.)

Connecting

the

receiver

and

speaker

in

this

manner

prevents

the

actuating

of

the

HT-32A

transmitter

/exciter

VOX

cir-

cuit

by

incoming

atdio

signals

from

the

receiver

and

also

disconnects

the

receiver

output

to

the

speaker

when

the

HT-32A

Transmitter/Exciter

is

on

the

air,

Use

an

i8-ohm

2

watt

resistor

for

3

to

8

chm

voice

coil

impedances

or

1500

ohm

2

watt

resistor

for

500-

600

ohm

outputs.

2-5-2-5.

BIAS

(Pins

5

and

9}.

impedance

b

iy

7

t

with

pin

9

used

as

the

return

or

ground

comiection.

The

bias

is

fixed

at

approximately

-100Vregardiess

of

the

modeof

operation

of

the

transmitter.

An

external

relay

may

be

used

with

the

fixed

bias

provided

at

pin

5

to

obtain

the

desired

application,

Note

that

the

bias

nea

and

not

intended

as

2a

"hard"

ana

not

intended

Rates

UE

p

th

a

2

5

a

a

-

tt

pe

al

:

fa

a

Ln

=

“-

a

-5-

bias

source

for

fixed

bias

applications

in

power

ampli-

fiers.

2-5-3,

FS

JACK,

This

is

a

standard

3-circuit

jack

that

brings

out

the

keying

circuit

required

for

frequency

shift

keying

used

in

teletype

transmission,

For

a

more

detailed

explanation

refer

toNOTES

on

page

23,

The

FSK

jack

accepts

the

standard

size

general

purpose

three-con-

ductor

phone

plug.

2-5-4.

ACCESSORY

POWER

OUTLET,

A

standard

AC

receptacle

is

provided

at

the

rear

apronas

aconyenient

source

of

117V

AC

power

for

the

antenna

relay

or

Similar

light

duty

loads.

Do

not

use

this

outlet

for

heavy

loads

such

as

a

power

amplifier,

2-6.

PHONE

PATCH

INPUT.

While

this

connector

is

not

located

on

the

rear

apron,

a

its

connecting

cable

will

be

fed

through

one

of

the

rear

cabinet

vents,

The

receptacle

is

located

on

the

side-

band

generator

unit

in

the

upper

right

hand

corner

of

the

deck

near

the

microphone

input

connector.

The

receptacle

is

a

standard

"phono"

type

of

jack

used

on

record

players

for

shielded

audio

cables,

The

input

impedance

is

500-600

ohms,

and

the

signal

level

re-

quired

for

maximum

SSB

power

or

100%

AM

modulation

is

a

functionof

the

AUDIO

LEVEL

control

setting,

and

runs

approximately

4

millivolts

at

the

full

clockwize

position,

At

reduced

sensitivity

settings

of

the

AUDIO

LEVEL

control,

demanded

by

the

output

of

the

oper-

ator's

microphone,

the

phone

patch

input

level

for

maxi-

mum

transmitter

output

will

be

proportionately

higher.

2-7.

ADDITIONAL

COUPLING

FOR

CALIBRATING

SIGNAL,

Most

instaliations

will

not

require

additional

mea-

sures

to

couple

the

receiver

to

the

transmitter

for

an

adequate

calibrating

signal

level.

However,

there

are

Situations

where

more

coupling

may

be

desired.

A

phone

tip

jack

has

been

provided

at

the

topof

the

shield

over

the

final

amplifier

tubes

to

cope

with

such

situa-

tions.

With

this

confignration

the

signal

level

is

ade-

quate

So

that

the

capacity

coupling

between

the

jack,

final

tank

capacitor,

and

tube

caps

will

provide

more

than

enough

coupling

if

a

wire

lead

witha

phone

tip

soldered

to

it

is

used

to

couple

the

receiver

to

the

transmitter,

The

phone

tip

is

merely

a

convenient

‘way

of

anchoring

the

coupling

lead

securely

to

prevent

its

accidently

coming

into

contact

with

the

amplifier

com-

ponents

inside

the

shield

compartment.

The

receiver

f

the

coupling

lead

may

be

connected

to

the

re-

ceiver

antenna

terminal

or

may

be

brought

into

close

proximity

of

the

antenna

terminal

as

determined

by

trial,

aI

Moe

I

Te

me

SE

MEST

SECTION

Iil

FUNCTION

OF

OPERATING

CONTROLS

3-1.

FUNCTION.

The

FUNCTION

control

is

afour

position

rotary

Switch

which

selects

CW,

DSB,

UPPER

or

LOWER

SIDEBAND

type

of

transmission

as

desired

by

the

oper-

ator,

An

analysis

of

the

FUNCTION

switch

operation

is

given

in

paragraphs

4-4,

4-5,

and

4-6,

3-2.

OPERATION.

This

control

is

a

five

position

rotary

switch

which

turns

the

power

to

thetransmitter

onor

off,

places

the

transmitter

incalibrate

operation

or

selects

the

mode

of

operation

(VOX

or

MOX).

The

"CALIBRATE"

po-

sitionis

used

in

conjunction

with

the

CALIBRATE

LEV-

EL

control.

(See

paragraph

3-11).

The

"MOX"

position

energizes

the

transmitter

con-

trol

relay

to

the

transmit

position,

This

position

of

the

OPERATION

switch

is

used

when

manual

control

of

transmission

is

desired,

Return

the

switch

to

the

"STANDBY

position

during

receiving

periods,

In

the

“CALIBRATE”

position,

the

HT-32A

Trans-~

mitter

/Exciter

control

relay

(VOX

RELAY)

is

de-en-

ergized,

permitting

normal

receiving

operation

with

an

antenna

change-over

relay

(if

used)in

the

receiver

po-

Sition,

With

the

receiver

inoperation

the

transmitter

signal

can

now

be

monitoredand

the

signalleyel

in

the

receiver

controlled

withthe

CALIBRATE

LEVEL

con-

trol.

See

paragraph

3-11.

Inthe

"PTT-VOX"

position,

the

transmitter

control

relay

may

be

operated

by

voice

energy

from

the

micro-

phone.

The

relay

tube

is

biased

to

cut-offand

will

not

energizethe

VOX

RELAY

until

signal

excitation

is

re-~

ceived

from

the

andio

amplifier

and

vox

amplifier

stages,

When

push-to-talk

operation

is

desired,

turn

the

VOX

sensitivity

control

fully

counterclockwise

and

then

control

the

transmission

with

the

microphone

switch,

3-3.

DRIVER

TUNING.

This

control

is

a

variable

capacitor

mthe

VFO

mixer

plate,

and

driver

plate

circuits,

and

will

resonate

the

Pavet

ttc

wainthea

Of

AO

9M

Th

ans

TH

eirenits

to

a

Lea

ene

fli

bale

UL

“EMS

phe)

iu

&.

a

ay

Ae

>

"4

r

da

av

mer

fw

Sih

Webs

Lis

attiy

Lai

meter

bands,

3-4.

BAND

SELECTOR.

The

BAND

SELECTOR

control

is

a

five

position

ro-

tary

switch

which

selects

the

proper

combination

of

tuned

circuits

and

stages

for

the

desired

frequency

band.

It

also

selects

the

correct

crystal

oscillator

(4.95

or

13.95

MC)

to

produce

the

desired

sideband

when

the

FUNCTION

switch

is

set

at

either

"UPPER"

or

"LOWER

SIDEBAND".

3-5.

FINAL

TUNING.

This

control

is

a

variable

capacitor

in

the

final

am-

-7-

plifier

tank

circuit

and

wili

resonate

the

circuit

to

the

operating

frequency

of

the

selected

band.

The

dial

calibrations

permit

presetting

the

control

roughly

dur-

ing

tune

up.

3-6,

FREQUENCY.

The

FREQUENCY

control

is

a

variable

capacitor

which

sets

the

VFO

frequency.

The

VFO

covers

the

frequency

range

5,000

kilocycles

to

5,500

kilocycles.

With

mixing

circuits,

the

VFO

will

set

the

HT-32A

Transmitter/Exciter

to

the

desired

operation

fre

-

quency

as

indicatedon

the

dial

inany

of

the

five

bands.

Each

minor

marker

on

the

skirt

of

the

FREQUENCY

control

is

equivalent

to

approximately

200

cycles

onal}

bands.

This

is

a

mechanical

brake

which

can

be

adjusted

either

to

Lock

or

apply

drag

to

the

FREQUENCY

con-

trol

to

ayaid

accidental

rotation

of

the

control

during

operation.

3-B.

AUDIO

LEVEL.

This

control

is

apotentiometer

connected

in

the

grid

circuit

of

the

third

audio

amplifier

stage

and

adjusts

the

amount

of

audio

drive

to

the

"bridged-T"

balanced

modulator.

It

has

sufficient

range

to

permit

adjust-

ment

for

any

high

level

crystal

microphone

or

low

Level

dynamic

microphone

normally

used

for

voice

com-

munications,

3-9.

RF

LEVEL.

The

RF

LEVEL

controlis

apotentiometer

inthe

grid

bias

circuitof

the

9MC

amplifier

tube

to

adjust

the

gain

of

the

9

MC

amplifier.

On

DSB

and

CW,

the

amount

of

carrier

in

the

output

signal

is

determinedby

the

setting

of

the

RF

LEVEL

control,

This

is

ameter

sensitivity

control

which

per

mits

the

operator

taset

the

meter

at

maximum

deflection

(0DB)

for

desired

output

Level

(between

approximately

1/4

power

and

full

power)

when

establishing

proper

drive

levelsin

the

HT-324

Transmitter/Exciter.

(See

LE

Y-~

EL

INDICATOR

METER,

paragraph

3-12).

3-11.

CALIBRATE

LEVEL.

The

CALIBRATE

LEVEL

control

provides

a

low

level

adjustment

of

the

transmitter

output

for

SSB,

DSB,

or

CW

operation

when

the

OPERATION

control

is

set

at

CALIBRAT&.

The

CALIBRATE

LEVEL

control

is

normally

set

to

provide

the

desired

signal

level

in

the

station

receiver

for

monitoring

purposes

and

need

not

be

changed

except

possibly

when

changing

bands.

For

CW

or

DSB

work

a

carrier

signal

is

obtained

for

''zero

beat"

frequency

setting.

On

SSB

a

sideband

signal

is

obtained

when

talking

into

microphone

to

"talk

onto

fre-

quency",

If

the

zero

beat

method

is

preferred

by

the

sideband

operator,

the

FUNCTION

control

is

switched

to

DSB

to

obtain

a

carrier

for

calibration

purposes

then

switched

back

to

the

desired

sideband

before

going

on

tbe

air,

_Note

that

o

DSB

|

or

cw

the

@

preset

RF

2

a

|

whe

aml

>

on

wok

hw

Lo

ols

he

16

To

Oe

The

LEVEL

INDICATOR

METER

indicates

the

out-

put

of

the

HT-32A

Transmitter/Exciter

in

DB

below

hO

DR

roeferenca,

enahling

the

adinetment

of

the

HT-

324A

Transmitter/

Exciter.

for

correct

output

(drive

level

required

for

a

linear

amplifier‘or

approximate

rated

output

for

"barefoot"

operation),

Tuning

of

the

transmitter

has

been

simplified

by

the

design

of

the

front

panel

meter

circuit.

The

meter

scale

is

com-

pressed

to

enable

low-level

signals

tonroduce

ausable

indication,

yet

strong

signals

do

not

drive

the

meter

pointer

off

scale,

This

feature

gives

the

meter

a

wide

usable

dynamic

range

which

is

not

possible

to

obtain

with

a

linear

scale,

The

desired

amount

of

compres-

sion

may

be

obtained

by

adjusting

the

METER

COM-

PRESSION

control

on

the

front

panel.

The

output

reading

on

the

LEVEL

INDICATOR

METER

can

be

shifted

to

readfull

scale

("0"DB)

down

to

approximate-

Tee

PLA

Wf

Fal

neawaw

ane

nee

Leeral

halon

¢hiac

roafaranna

Ly

4/2

OL

ture

POWCED

aa

any

2OVCL

GOLUW

Tuib

ACL

Cie

can

easily

be

read

on

the

meter.

A

log

of

METER

COMPRESSION

control

settings,

for

normal

output

into

loads

of

controlled

and

reproducible

characteristics,

will

aid

in

re-establishing

proper

drive

levels

and

determining

the

proper

operation

of

the

unit,

The

log

shonld

be

recorded

at

various

frequencies

and

modes

of

operation,

To

monitor

carrier

suppressionfor

SSB

operation,

set

the

METER

COMPRESSION

contro}

to

read

zero-DB

reference

on

the

meter

at

the

maximum

sideband

out-

put

(single

tone),

and

read

carrier

level

directly

when

the

audio

excitation

is

removed,

Note

that

the

MOX

mode

of

operation

must

be

used

for

this

test,

since

on

VOX

operation

the

transmitter

is

disabled

between

voice

controlied

transmissions

by

the

operation

of

the

VOX

relay.

SECTION

IV

TUNING

PROCEDURE

4-1.

GENERAL.

The

tuning

procedure

for

the

Model

HT-32A

Trans-

mitter/Exciter

has

been

simplified

by

design

as

much

as

possible

to

permit

rapid

adjustment

by

the

operator.

This

does

not

mean,

however,

that

atransmitter,

com-

mercial

or

home-built,

may

be

operated

successfully

when

only

roughly

adjusted.

A

clean

signal

from

any

transmitter

reqttires

good

operator

technique.

Two

mis-tuning

conditions

onthe

HT-32A

Trans-

mitter/Exciter

are

possible,

neither

of

which

can

be

accidentally

used

on

the

air.

These

undesired

signals

are

visible

on

the

output

meter

due

to

the

extreme

range

of

levels

handledby

the

metering

circuit

and

are

60DBor

more

below

fundamental

output

when

the

trans-

mitter

is

correctly

tuned

up.

1,

On

the

15-meter

band

the

undesired

signal

will

appear

when

the

DRIVER

TUNE

control

is

set

outside

itsnormal

tuning

range,

approximately

0

to

1

division

on

the

dial.

Note

that

its

level

cannot

be

increased

on

AM

or

CW

with

the

RF

LEVEL

control

or

driven

by

speech

input

on

SSB,

hence

may

be

identified

in

this

manner.

On

the

10-meter

band

the

undesired

signal

will

appear

when

the

DRIVER

TUNE

control

is

set

outaide

its

normal

tuning

range.

For

example,

when

tuning

the

29

MC

to

29.5

MC

segment

of

the

10-meter

band,

the

DRIVER

TUNE

control

willnormally

tune

up

around

4

onthe

dial

while

the

unwanted

signal

tunes

up

at

around

2

divi-

sions

on

the

dial,

Here

againit

is

identifiedby

the

fact

that

its

level

cannot

be

increased

on

AMor

CW

withthe

RF

LEVEL

control

or

driven

on

SSB

with

speech

input,

4-2,

LOAD.

Connect

a

50-chm

non-reactive

load

to

the

R.F.

OUTPUT

connector

on

the

HT-32A

Transmitter/Ex-

citer.

This

impedance

may

be

an

antennaor

a

proper-

ly

adjusted

linear

amplifier.

A

50-ohm

non-reactive

loadof

at

least

100

watts

dissipation

capabilities

is

re~

eee

ee

es

ee

os

es

eee

ed

Quis

6a

(0

f2ancde

tue

full

power

ouUTput,

4-3.

INITIAL

CONTROL

SETTINGS.

Set

the

front

panel

controls

to

their

starting

positions

as

outlined

below.

OPERATION

........

wee

.

STANDBY

(Power

on)

FUNCTION

2...

ccc

cece

ee

een

ee

en

eceree

.

DSB

AUDIO

LEVEL

......

ccc

e

cesses

eee

ce

cer

cetae

.

0

RF.

LEVEL

oo.

cece

ccc

eee

et

ees

neee

seas

0

METER

COMPRESSION

.....00ceeceees

sees

5

CALIBRATE

LEVEL

....-.cscceeceeenvecerees

0

DRIVER

TUNING

,........-

CENTER

OF

ROTATION

FINAL

TUNING.........

-DESIRED

BAND

SEGMENT

BAND

SELECTOR

.....

eeeteeeeees

DESIRED

BAND

FREQUENCY.......-.-.+...DESIRED

FREQUENCY

4-4,

CW

TUNING.

The

tuning

procedure

for

CW

operation

will

be

presented

first

since

AM

(DSB)

and

SSB

tuning

pro-

cedures

are

modifications

of

that

required

for

CW

operation,

re

he

tuning

procedure

for

CW

operation

isasfollows:

1.

Set

the

OPERATION

switch

at

MOX;

FUNCTION

switch

at

DSB,

ro

ae

|

an

nal

amplifier

stages

with

d

FINAL

TUNE

controls

for

maximum

meter

deflection.

Advance

the

RF

LEVEL

control

slightly,

if

necessary,

to

obtain

reasonable

meter

readings

for

tune

up.

Since

these tuned

circuits,

as

in

any

transmitter,

affect

transmitter

performance,

ALWAYS

TUNE

FOR

MAXIMUM

OUTPUT.

Set

FUNCTION

switch

at

CW

and

close

key.

Advance

the

RF

LEVEL

controi

slowly

while

ob-

serving

the

output

meter.

When

feeding

a

dummy

or

anantenna

load,

set

thecontrol

at

a

point

where

further

rotation

does

not

cause

an

appreciable

increase

inthe

meter

reading.

This

is

saturation

output;

operate

slightly

beiow

this

level

for

CW.

When

driving

a

final

amplifier

stage

with

the

HT-32A

Transmitter/Exciter,

advance

the

RF

LEVEL

control

until

required

excitation

is

obtained

for

the

amplifier.

In

either

cage,

do

not

operate

beyond

the

satura-

tion

level.

A

convenient

reference

for

this

operating

level

may

be

obtained

by

setting

the

METER

COM-

PRESSION

control

so

that

the

output

meter

reads

zero

DB.

Recheck

the

driver

and

final

tuningby

reducing

the

carrier

level

by

about

Sor

10

DB

onthe

out-

pnt

meter

withthe

R

F

LEVEL

control

and

touch-

ingup

the

DRIVER

TUNE

and

FINAL

TUNE

con-

trols

for

maximum

output.

Reset

the

RF

LEVEL

control

for

maximum

output

just

below

the

satu-

ration

point,

as

outlined

above.

Open

the

key.

The

output

should

drop

to

zero,

When

the

transmitter

and

récéiver

share

the

same

antenna

(via

an

antenna

relay),

manual

CW

operation

is

accompUshed

by

switchingbe-

tween

"MOX"

(to

transmit)

and

"STANDBY"

(to

receive),

Note

that

manual

operation

will

not

be

possible

unless

the

CW

DELAY

control

fkmurled

sleeve

shaft

of

R49)

is

turned

fully

(onan

ee

ee

elit

clockwise.

See

Figure

9,

Antomatic

break-in

keying

with

a

shared

an-

tenna

system

is

accomplished

by

placing

the

OPERATION

contrul

in

the

"MOX"

position,

and

turning

the

CW

DELAY

control

(sleeve

shaft)

counterclockwise

untilthe

VOX

relay

de-energizes

(as

in

"receive"

operation),

With

this

accomplished,

any

time

the

key

is

closed,

the

VOX

relay

will

energize,

and

immediate

transmission

will

begin,

startiug

from

the

first

dot.

Note

that

this

setting

of

the

CW

DELAY

control

(sleeve

shaft)

affords

the

longest

delay

between

the

time

transmission

ends

and

the

receiver

is

reactivated.

For

shorter

delays,

turnthe

CW

DELAY

control

(sleeve

shaft)

fur-

ther

counterclockwise,

Torestore

normal

CW

operation

on

"MOX",

return

the

CW

DELAY

control

{sieeve

shaft)

to

its

maximuin

clock-

wise

position,

Note

that

the

CW

DELAY

(sleeve

shaft)

control

adjustment

need

not

be

changed

when

switching

to

other

manually

operated

modes

of

operation,

such

as

DSB

or

SSB;

but,

if

normal

mannal

CW

operation

is

desired,

the

CW

DELAY

contrul

(sleeve

shaft)

must

be

set

at

its

maximum

clock-

wise

position,

Refer

to

the

use

of

the

"CAL"

position

of

the

OPERATION

switch

andthe

CALIBRATE

LEV-

EL

control

for

"Zeroing-in"

on

the

receiver

frequency.

See

paragraph

3-11,

4-5.

SSB

TUNING.

OPERATION

switchat

MOX;

FUNCTION

at

DSB

(Audio

level

zero).

2.

Tune

the

driver

aud

final

amplifier

stages

as

described

for

CW

tune

up.

w

.

Set

the

FUNCTION

switch

to

UPPER

or

LOW-

ER

sideband

as

desired.

If

the

outpnt

meter

was

referenced

at

zero

DB

for

maximum

out-

put

with

the

COMPRESSION

control,

the

meter

will

now

indicate

the

carrier

suppression

di-

rectly

in

DB

below

maximum

output.

4,

Set

the

OPERATION

switch

at

MOX

(manual

operation).

5,

While

monitoring

the

transmitter

output,

pro-

ceed

with

SSB

transmission,

setting

the

AUDIO

LEVEL

control

for

the

required

audio

gain

which

dees

not

produce

peak

flattening

or

over-

joad

distortion

of

the

outpnt

signal

Note

that

the

output

meter

damping

factor

prevents

the

meter

from

indicating

ODB

reference

on

voice

«sade

The

moter

will

awing

raughly

9/3

aeal

a

pean,

2A

GEAR

Week

ee

i

de

2

ee

yf

eee

with

voice

excitation,

6.

If

manual

operation

is

desired

on

SSB,

switch

the

OPERATION

control

between

MOX

and

STANDBY.

For

voice

control

operation,

with

the

receiver

and

transmitter

interconnected,

set

the

OPERATION

control

at

PTT-VOX.

To

"zero-in"

on

frequency,

see

paragraph

3-11

re-

garding

the

calibration

procedure.

For

infor-

mation

on

the

use

of

the

VOX,

DELAY,

and

ANTI-TRIP

controls,

see

paragraphs

4-8

and

4-9.

4-6.

AM

(DSB)

TUNING.

The

tuning

procedurefor

AMoperation

is

asfollows:

1,

Set

the

OPERATION

switchat

MOX;

FUNCTION

switch

at

DSB

(Andio

level

zero),

2

Tune

the

driver

and

fiual

amplifier

stages

as

described

for

CW

tune

up.

3.

Whenfeeding

a

dummy

or

antenna

ioad,

advance

she

DOT

ay

the

RF

LEVEL

control

to

the

saturated

output

level

and

reference

0

DB

on

the

output

meter

withthe

METER

COMPRESSION

control,

as

de-

scribedfor

CW

tune

up,

When

driving

alinear

power

amplifier

withthe

HT-32A

Transmitter

/

Exciter,

advance

the

RF

LEVEL

control

until

maximum

linear

power

ontput

is

obtained

from

the

finalamplifier

stage

before

setting

the

ref-

erence

level

on

the

output

meter,

4,

Withthe

RF

LEVEL

control,

reduce

the

carrier

level

6

DB,

as

read

on

the

outpnt

meter,

This

sets

the

maximum

carrier

levelthat

the

linear

amplifiers

inthe

HT-32A

Transmitter

/Exciter,

or

following

linear

power

amplifier,

can

handle

and

provide

100%

modulation

capabilities,

This

carrier

reference

level

can

be

established

more

precisely

if

an

oscilloscope

and

audio

oscillator

are

used

to

set

up

and

monitor

the

output

signal

Note

that

if

the

carrier

level

is

set

too

high,

peak

amplitudesare

flattened

be-

fore

100%

modulation

occurs.

If

the

carrier

level

is

set

too

iow,

the

maximum

power

output

capabilities

are

not

attained

at

100%

modulation,

Whila

monitoring

the

tranemittear

output,

pro-

Ts

oom

ceed

with

AM

transmission,

setting

the

AUDIO

LEVEL

contro!

for

the

required

audio

gain

which

does

not

produce

peak

flattening, or

over

modulation

distortion

of

the

output

signal

Note

that

the

output

meter

damping

factor

permits

a

Tough

operational

check

on

over-modulation.

The

output

meter

will

drop

about

1

to

2

DB

in

level

when

the

percentage

of

modulation

with

voice

excitation

runs

close

to

100%,

nm

§&.

If

manual

uperation

is

desired

on

AM,

switch

the

OPERATION

control

between

MOX

and

STANDBY.

For

voice

control

operation

with

the

receiver

and

transmitter

interconnected,

set

the

OPERATION

control

at

PTT-

VOX,

4-7.

SEGMENT

ALIGNMENT

FOR

10M

BAND.

ar

The

HT-32A

Transmitter

/Exciter

is

set

up

at

ihe

factory

to

provide

transmission

in

the

28.

5

to

29,

0

MC

segment

of

the

10M

band.

The

other

0.5

MC

segments

of

the

10M

band

are

set

up

as

follows:

(Refer

to

»

Figure

6

i

or

ijocations

of

+ha

tha

yarieus

adjustme

entea

following

wa

=

wa

A

wee

procedure,

)

1.

Tune

up

on

CW

and

determine

the

saturation

level

settings

of

the

RF

LEVEL

control.

Re-

cord

this

settingfor

future

reference

in

step

5.

Remove

the

32.5

MC

crystal

and

insert

de-

sired

crystal

*

019-201963

019-201964

01

9-201965

019-201966

supplied

with

the

transmitter,

3

Connect

electronic

voltmeter

or

similar

high

impedance

DC

voltmeter

(0-10¥V)

to

crystal

oscillator

test

point,

and

adjust

crystal

os-

eillator

trimmer

for

approximately

half

of

the

yoltags

obtained

at

the

maximum

voltage

setting

of

the

trimmer.

Set

the

trimmer

on

the

gentle

Slope

side

of

resonance,

4.

Set

TRAP

TRIMMER

for

minimum

capacity

and

adjust

10M

mixer

trimmer

for

maximum

out-

put.

Increase

RF

LEVEL

contral

setting,

if

necessary,

to

pick

up

an

output

meter

reading

as

the

mixer

ig

tuned

to

resonance,

Back

off

the

RF

LEVEL

as

resonance

is

obtained

with

mixer

trimmer

and

DRIVER

TUNE

control

-JO-

Ss)

OC)

o-

IO

M

OC

90

UU

OM

CRYSTAL

OSC.

——=p

(@)

|

0

|¢

092-203

8598

ta

TRAP

SHOWN

SET

FOR

MIN.

CAP,

O)

©

O

TEST

TRAP

Figure

6.

10

Meter

Band

Adjustments

Touch

al

?

up

FINAL

TUNE

control,

then

adjust

crystal

oscillator

trimmer

and

RF

LEVEL

con-

trol

until

the

saturation

output

again

occurs

at

the

RF

LEVEL

setting,

originally

obtained

for

the

previous

crystal

used,

See

step

1,

§.

Trap

adjustment

-

This

adjustment

is

optional

as

far

as

spurious

output

inthe

10M

band

is

concerned,

since

its

level

is

less

than

60

DBhbe-

iow

fundamental

only

when

the

transmitter

is

mistuned.

To

locate

the

spurious

signal,

turn

the

RF

LEVELecontrol

to

zeroor

switch

to

the

upper

or

lower

sideband

position

of

the

opera-

tion

switch,

and

tune

the

DRIVER

TUNE

and

FINAL

TUNE

for

maximum

output.

Adjust

the

10M

trap

trimmer

for

minimum

output

meter

reading.

7.

Re-check

the

10M

mixer

trimmer

setting

by

retuning

for

the

desired

frequency

and

peak-

ing

the

trimmer,

since

the

trap

adjustment

will

affect

the

original

mixer

setting

slightly.

4-8.

USE

OF

VOX

AND

DELAY

CONTROLS.

The

VOXand

DELAY

controla

are

locatedon

the

top

of

the

HT-32A

Transmitter

/Exciter

chassis,

as

illus

trated

in

Figure

7.

Both

controls

are

utilized

in

con-

junction

with

VOX

operation

and

are

adjusted

to

pro-

vide

control

of

the

transmitter

and

station

receiver.

1.

The

VOX

contro]

is

an

audin

sensitivity

con-

trol

which

determines

the

andio

level

that

will

trip

(energize)

the

VOX

RELAY,

and

place

the

HT-32A

Transmitter

/Exciter

"on

the

air",

This

control

should

be

adjusted

with

the

micro-