Hallicrafters Ht-40 mk1 Training manual

allicraliers

OPERATING

AND

SERVICE

INSTRUCTIONS

COMMUNICATIONS

TRANSMITTER

MODEL

HT

-40

MARK

I

"The Hallicrafter's Company warrants each new radio product manu-

factured by it to be

free.

from defective material and workmanship

and agrees to remedy any such defect or to furnish a new part in ex-

change

for

any part

of

any unit of its manufacture which under

nor-

mal instaliation, use and service discloses such defect, provided the

unit

is

delivered by the owner to our authorized radio dealer, whole-

saler, from whom purchased,

or,

authorized service center, intact,

for

examination, with

all

transportation charges prepaid within ninety

days from the date

of

sale to original purchaser and provided that

such examination discloses in our ;udgment that it is thus defective.

This warranty does not extend

to

any

of

our radio products which

have been sub;ected

to

misuse, neglect, accident, incorrect wiring not

our own, improper installation,

or

to use in violation

of

instructions

furnished by us, nor extended to units which have been repaired

or

altered outside

of

our factory or authorized service center, nor to cases

where the serial numberthereof

liaS

beenremoved, defacedorchanged,

nor to accessories used therewith not

of

our own manufacture.

Any

part

of

a unit approved

for

remedy

or

exchange hereunder will

be remedied or exchanged

by

the authorized radio dealer

or

whole-

saler without charge to the owner.

This warranty is in lieu

of

all other warranties expressed or implied

and no representative or person

is

authorized to assume

for

us any

other liability in connection with the sale

of

our radio products:'

092-01266~

Figure

1.

View

of

Transmitter.

SECTION

I

GENERAL

DESCRIPTION

1-1.

INTRODUCTION.

The

Halli

cr

afte

r s

Model

HT-40

MK1

or

HT-40K

MK1

kit

is

a

four-tube,

self-contained

tr

a

nsmitter

capable

of

AM

(amplitude

modu-

l

ated)

and

CW

(continuous

wave)

transmission

on

the

80,

40,

20,

15,

10,

and

6

meter

bands.

The

on

ly r

equirements

for

immediate

"on-the-

a

ir

"

opera

ti

on

are

a

50-ohm

to

75-ohm

termi-

nated

antenna,

a

crystal

or

external

VFO,

a

key

or

microphone

and

a

117-v

o

lt,

60-CPS,

AC

power

source

.

1-2.

T.V.I.

SUPPRESSION.

The

transmitter

has

been

designed

and

con

-

structed

to

suppress

spurious

radiati

o

ns

that

may

ca

use

television

interference

(T.V.I.).

The

T.V.1.

problem

has

been

given

full

consideration

in

the

c

ircuit

design

and

in

the

selection

and

layout

of

parts.

Adequate

filtering

has

been

provided

for

con

tr

ol

c

ir

cui

ts

and

AC

power

lines.

Components

were

specifically

selected

to

avoid

undesired

re-

sonances

and

arranged

to

prevent

parasitic

os

-

cillation.

Another

important

T.V.1.

proofing

feature

is

employed

in

the

output

coup

lin

g

ci

r

cuit

to

the

final

amplifier.

The

tuned

output

ci

r

cu

it

is

a

pi

network

which

has

excellent

inherent

harm

onic

suppression

capabi

lit

y.

The

pi

network

is

con-

nected

to

a

coaxia

l

connector

and

permits

the

use

of

all

antenna

systems

having

an

impedance

of

50

ohms

to

75

ohms.

The

transmitter,

as

re

c

eived

from

the

f

ac

-

tory,

has

every

advantage

of

Ha

lli

crafters

ad-

vanced

engineering

to

minimize

television

inter-

ference.

Ther

e

are,

however,

some

types

of

T.

V.l.

which

cannot

be

prevented

within

the

transmitter

itse

lf.

Therefore,

it

is

recommended

that,

for

maximum

T.

V.1.

free

operation

of

your

trans-

mitter,

a low

-pass

filter

be

installed

between

the

transmitter

o

utput

connecto

r

and

the

coaxia

l

antenna

feed

line.

TECHNICAL

SPECIFICATIONS

TYPES

OF

EMISSION

AM

• •

••

••••

•.•.••••••

•••

Amplitude

modulation

cw

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

.

FREQUENCY

SELECTION

••••••••

FREQUENCy

COVERAGE • • • • • •

POWER

INPUT

AM

••••

• • •

Continuous

wave

• • •

Crystal

controlled

or

external

VFO

• 80, 40, 20, 15, 10,

and

6

meter

bands

•

••

75

watts

peak

power

CW

••••

•

••••••••••••••••

75

watts

maximum

AUDIO

INPUT

0.004 V

minimum

at

input

to

microphone

jack

DISTORTION • •

••

8%

at

75%

modulation

HUM AND NOISE OUTPUT • • • • • • • • • • • • • • 40 DB

or

more

below

maximum

output

TUBES

•••••••••••

•

Four,

plus

two

silicon

rectifiers

POWER

SOURCE • • • • •

••

105-125

volts,

60 CPS,

AC

OUTPUT

COUPLING • •

.•

Pi

network

POWER

CONSUMPTION • • • • • • •

•••••

175

watts

RF

OUTPUT IMPEDANCE

••••••••.•••••

50

to

75

ohm

coaxial

connector

accepts

Am-

phenol

83-1SP

connector

CW

KEYING.

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

Panel

mounted

key

jack

accepts

standard

2-

connector

1/4"

plug

MICROPHONE

INPUT.

• •

••

•••••••••••

Rear

chassis

mounted

microphone

receptacle

Amphenol

75-MC1F

connector

DIMENSIONS • • • • • •

•••••••••••

7-3/16"

high,

13-3/8"

wide,

8-1/4"

deep

NET

WEIGHT • • • • • • • • • . • . • • • • • • . . • 17

pounds

SHIPPING

WEIGHT • • • • • • • •

•••

19

pounds

FREQUENCY COVERAGE

Band

Transmitter

Frequency

Range

Crystal

or

VFO

Frequency

Range

80

3.5

MC

to

4

MC

3500 KC

to

4000 KC

40 7

MC

to

7.3

MC

7000 KC to 7300

KC

20 14

MC

to

14.35

MC

7000 KC

to

7175 KC

15 21 MC

to

21.45 MC 7000 KC

to

7150 KC

10 28 MC

to

29.7 MC 7000 KC

to

7425 KC

6 50

MC

to

54 MC 8333 KC

to

9000 KC

Note: 1000 KC = 1 MC

2

SECTION

II

INSTALLATION

2-1.

UNPACKING.

Mter

unpacking

the

transmitter,

examine

it

closely

for

any

possible

damage

which

may

have

occurred

during

transit.

Should

any

sign

of

damage

be

apparent,

file

a

claim

immediately

with

the

carrier

stating

the

extent

of

damage.

Carefully

check

all

shipping

labels

and

tags

for

special

in-

structions

before

removing

or

destroying

them.

2-2.

LOCATION.

The

unit

should

be

placed

in

a

location

that

provides

adequate

space

around

it

to

permit

free

circulation

of

air

through

the

cabinet

openings.

Avoid

excessively

warm

locations

such

as

those

on

or

near

radiators

and

heating

vents.

2-3.

POWER

SOURCE.

The

transmitter

is

designed

to

operate

on

105-volt

to

125-volt,

60

cycle,

AC

current.

Power

consumption

is

175

watts.

IMPORTANT

If

in

doubt

about

the

power

source,

contact

your

local

power

company

prior

to

inserting

the

power

plug

into

an

AC

power

outlet.

Plugging

the

pow-

er

cord

into

the

wrong

power

source

can

cause

extensive

damage

to

the

unit,

requiring

costly

repairs.

2-4.

CRYSTAL-VFO

RECEPTACLE.

The

CRYST

AL-

VFO

receptacle

consists

of

two

jacks,

mounted

on

the

front

panel,

to

ac-

commodate

.093

"diameter

pins

with

1/2"

center

separation

(similar

to

type

FT-243

crystal

holder).

468

r----

L

(FEET)

• I

I

FREQUENCY

(MC)

I

~"f-M~'="',,{L.~l'Jo..A.A..LJ~,=,,~--rINS~

COAXIAL LEAD

092-010130C

Figure

2.

Coaxial

Feci

Half-Wave

Dipole

Antenna.

When

an

external

VFO

is

used,

connect

the

high

(hot)

side

of

the

VFO

output

to

the

red

jack

and

the

ground

side

to

the

black

jack.

2-5.

KEY

RECEPTACLE.

The

KEY

jack,

a

standard

two-conductor,

closed

circuit

type

jack

located

on

the

fro'"'t

panel,

provides

for

the

connection

of

ahandkeyer,

a

bug,

or

an

automatic

keyer

(T.O.

Keyer).

In

addition

to

the

KEY

jack,

the

keying

instrument

may

be

con-

nected

to

terminals

3

and

4 of

the

four-terminal

strip

located

on

the

rear

of

the

chassis.

These

con-

tacts

are

connected

in

parallel

with

the

KEY

jack

when

the

plug

is

removed

from

the

jack

(see

para.

2-8).

2-6.

MICROPHONE

CONNECTOR.

The

microphone

connector,

located

on

the

rear

of

the

chassis,

is

an

Amphenol

type

75-PC1M

bulkhead

receptacle

and

will

accept

an

Amphenol

type

75-MC1F

microphone

plug.

2-7.

ANTENNAS.

It

is

suggested

that

a

half-wave

dipole

an-

tenna

fed

with

a

50-ohm

coaxial

cable

be

used

to

radiate

maximum

power

from

the

transmitter

(see

figure

2).

Refer

to

the

ARRL

ANTENNA HAND-

BOOK

or

similar

publications

for

detailed

infor-

mation

concerning

transmitting

antennas.

2-8.

ACCESSORY

TERMINAL

STRIP.

A

four-terminal

strip

on

the

rear

of

the

chassis

permits

connecting

the

transmitter

to

auxiliary

equipments.

The

FUNCTION

switch

in

the

AM

or

CW

position

electrically

connects

terminals

1

and

2.

When

the

FUNCTION

switch

is

in

either

the

OFF,

TUNE,

or

STANDBY

position,

these

terminals

are

not

electrically

connected.

When

terminals

1

and

2

are

connected

to

auxiliary

equipment

such

as

an

antenna

changeover

relay,

the

FUNCTION

switch

controls

the

operation

of

the

relay

(see

figure

3).

Terminals

3

and

4

connected

across

(in

parallel

with)

the

KEY

jack

terminals,

when

the

plug

is

removed

from

the

KEY

jack,

permit

the

transmitter

to

be

connected

to

a

remote

control

switching

device

such

as

the

SX-140

Receiver,

a

remote

control

switch,

or

separate

leads

from

the

push-to-talk

switch

on

the

microphone

(see

figure

4),

The

transmitter

may

be

keyed

by

connecting

a

key

to

terminals

3

and

4.

For

remote

control

oper-

ation

or

keying

from

these

terminals,

the

key

plug

must

be

removed

from

the

KEY

jack

and

the

short-

ing

wire

removed

from

terminals

3

and

4.

3

SECTION

III

OPERATING

CONTROLS

3-1.

FUNCTION

CONTROL.

The

FUNCTION

control,

a

five-position

ro-

tary

switch,

is

used

to

select

the

transmitter

mode

of

operation

as

indicated.

1.

OFF

position:

AC

power

is

disconnected

from

the

power

transformer

primary.

2. TUNE

position:

power

is

applied

to

the

oscillator

and

buffer

stages

but

not

to

the

modulator

and

final

amplifier

sta-

ges.

Grid

current

is

adjusted

with

the

DRIVE

control

for

maximum

indication

on

the

RF

OUTPUT

-GRID CURRENT

meter.

3.

ST

ANDBY

position:

the

negative

side

of

the

DC

power

supply

is

disconnected

from

the

internal

circuitry.

Provision

is

made

for

remote

control

switching,

refer

to

paragraph

2-8.

SX

-

140

RECEIVER

CONTACTS

OF

FUNCTION

SWITCH

AUXILIARY

SWITCHING

CONTACTS

SWITCH CONTACTS SHOWN IN

NORMAL

OR

RECEIVING

POSITION

NOTE

A unique

feature

of

the

power

supply

allows

current

to

be

constantly

fed

through

the

bleeder

w

hen

in

the

ST

ANDBY

position,

thus

providing

better

voltage

regulation

when

switch-

ing

from

STANDBY

to

AM

or

CW.

4.

AM

position:

power

is

applied

to

the

oscillator,

buffer,

speech

amplifier,

final

amplifier

and

modulator

stages.

5.

CW

position:

power

is

applied

directly

to the

buffer

and

final

amplifier

plate,

and to the

oscillator

and

final

amplifier

screen

grid

through

the 6DE7

modulator

tube which, in the

CW

position

functions

as

a

series

regulator

tube.

3-2.

BAND

SELECTOR

CONTROL.

The

BAND

SELECTOR

is

a

six-position,

multi-section

rotary

switch

used

to

select

the

pro-

HT

-

40

TRANSMITTER

CONTACTS OF

FUNCTION SWITCH

~

STANDBY

EXTERNAL

POWER SOURCE

Figure

3.

Transmitter

Controlling

an

Antenna

Relay.

4

S x-

140

RECEIVER

EXTERNAL

POWER

SOURCE

HT -

40

TRANSMITTER

SWITCH CONTACTS

SHOWN

IN

NORMAL

OR

RECEIVING

POSITION

092-00962.9B

Figure

4.

Transmitter

Controllecl

by

Station

Receiver.

per

inductance

in

the

driver

and

final

amplifier

pi

network

for

each

band.

3-3.

DRIVE

CONTROL.

The

DRIVE

control

is

a

variable

capacitor

used

to tune the

plate

circuit

of the

buffer

stage.

This

control

also

functions

as

the input tuning

capacitor

of the

pi

network

between

the

output of

the

buffer

stage

and the input

to

the

final

ampli-

fier

stage.

Operation

of

this

control

is

such

that

it

is

impossible

to tune to a

harmonic

of

the

desired

output

frequency.

3-4.

CRYSTAL-VFO

SWITCH.

The CRYSTAL-VFO

switch

is

a

SPDTslide

switch

which

permits

the

transmitter

to

operate

either

crystal

controlled

or

to

operate

from

an

external

VFO.

3-5.

RF

OUTPUT-G'RID

CURRENT

SWITCH.

The

RF

OUTPUT-GRIDCURRENT

switch

is

a DPDT

slide

switch

which

permits

the

operator

to

switch

the

meter

either

intothe

grid

circuit

of the

final

amplifier

(6DQ5)

or

across

the

RF

output

load.

3-6.

PLATE

LOADING

CONTROL.

The

PLATE

LOADING

control

is

a

variable

capacitor

in

the output of the

pi

network

section

which

adjusts

the

plate

load

impedance,

thus

matching

the

transmitter

to

the

antenna.

3-7.

PLATE

TUNING

CONTROL.

The

PLATE

TUNING

control

is

a

variable

capacitor

which

tunes

the

plate

circuit

of

the

final

amplifier

(6DQ5) to the

desired

operating

fre-

quency.

3-8.

MIKE

GAIN

CONTROL.

The MIKE GAIN

control,

a

I-megohm

po-

tentiometer

located

on the

rear

of

the

chassis,

controls

the audio Signal

applied

to

the

grid

of the

audio

amplifier

tube V3B.

3-9.

MODULATION

AND

KEYING

INDICATOR.

The modulation and

keying

indicator

lamp

functions

as

a

voltage

reference

device

for

the

grid

of

the

6DE7

regulator

tube

and

will

dim

as

the

transmitter

is

keyed.

In

AM

operation,

the

indicator

has

been

set

to

indicate

80%

modulation when the

lamp

is

just

flickering

on

and off.

5

'"

::n

PLATE

LOADING

PLATE

TUNING

R.F.

OUTPUT

-

GRID

CURRENT

CQ

c:

II

; TRANSMITTER

r:=r

~

MODEL

HT-40

....

..,

Q

::s

'"

3 ®

-

CD

..,

."

..,

0

::s

0 0

the

hallicrafters

co.

-

."

Q

::s

FUNCTION BAND SELECTOR DRIVE CRYSTAL KEY

CD

-

C.w.

20

15

• CRYSTAL VFO

R.

F.

OUTPUT

()

4@

.@.

0

STAND;~M~

G

::s

80

06

~

@

-

..,

0 G

;;;-

TUNE

OFF

VFO GRID CURRENT

092-

012051

SECTION

IV

OPERATION

4-1.

GENERAL.

The

tuning

procedure

for

the

transmitter

has

been

simplified

in

design

to

permit

rapid

adjustment

to the

desired

frequency.

However,

this

does

not

mean

that

the

transmitter

may

be

opera-

ted

successfully

when only

rough

tuning

adjust-

ments

are

made.

A

clean

signal

from

any

trans-

mitter

requires

good

operating

technique.

4-2.

TUNING

PROCEDURE

FOR

CW

OPERATION.

The

following tuning

procedure

must

be

per-

formed

prior

to

operating

the

transmitter

in

the

CW

mode.

EQUIPMENT REQUffiED

1.

50-ohm,

non-inductive

dummy

load

or

a

40-watt

light

bulb

(see

figure

6).

2.

Crystal

with

its

fundamental

or

har-

monic

frequency

corresponding

to

the

desired

transmitting

frequency

or

an

external

VFO.

PROCEDURE

1.

Set

the

controls

as

indicated:

MIKE

GAIN.

. . • .

..

Maximum

counter-

clockwise

FUNCTION . . . . .

..

OFF

BAND

SELECTOR

..

Desired

band

DRIVE . . . . • . . .

..

Center

of

range

CRYSTAL-

VFO

. .

..

CRYSTAL

RF

OUTPUT-GRID..

GRID

CURRENT

PLATE

LOADING

80

to

20

meter

bands

Near

100

10

and

6

meter

band

::

Near

0

PLATE

TUNING

80

to

20

meter

bands

..

Near

100

10 and 6

meter

band

..

Near

0

2.

Insert

crystal

of

desired

frequency

into

the

CRYST

AL-

VFO

socket.

3.

It

may

be

desirable

to

insert

the

key

plug

into

the KEY

jack

and

close

the

key

at

this

time

to allowthe

operator

to

tune

the

transmitter.

However,

this

is

not

necessary

since

the

jack

is

a

normally

closed

circuit

type when

the

key

plug

is

removed.

4.

Connect

the

dummy

load

to

the

antenna

connector

on the

rear

chassis

panel

and

plug

the

line

cord

into a

117-volt,

AC

utility

outlet.

5.

Set

FUNCTION

control

to STANDBY,

allow

approximately

5

minutes

to

warm

up,

then

set

FUNCTION

control

to

TUNE.

6.

Adjust

DRIVE

control

for

maximum

de-

flection

onthe

RF

OUTPUT-GRID

CUR-

RENT

meter.

7.

Set

RF

OUTPUT-GRID

CURRENT

switch

to the

RF

OUTPUT

position.

8.

Rotate

FUNCTION

control

to CW.

NOTE

In

steps

9,10,

and

11

the

final

settings

of

the

PLATE

LOADING and

PLATE

TUNING

controls

will

be

the

setting

which

is

nearest

the 100

mark

on

the

Tuning knob

dials.

These

settings

will

be

near

100 on

the

80 and 40

meter

bands

and

progressively

lower

on

the

20

to

6

meter

bands.

On 6

meters,

the

correct

setting

will

be

between

0 and

20.

092-

0101528

Figure

6.

Light

Bulb

Used

as

Dummy

Load.

7

9. Adjust

PLATE

TUNING

control

for

maximum

output

indication

on the

me-

ter.

10. Adjust

PLATE

LOADING

control

for

maximum

output

indication

on the

me-

ter.

11.

Repeat

steps

9 and 10

until

maximum

output

is

obtained; note the

approximate

meter

reading.

12.

Turn

transmitter

off

with

the FUNC-

TION

control,

disconnect

the dummy

load

and

connect

the

transmitting

an-

tenna.

13. Rotate the FUNCTION

control

to

CW

and note output

indication.

If

the

antenna

impedance

is

approximately

the

same

as

that

of the

dummy

load,

the

meter

indication

will

be

approximately

the

same

as

that

noted

in

step

11.

If

antenna

line

is

open, a

higher

indication

will

be

noted;

if

antenna

line

is

shorted,

ap-

proximately

zero

indication

will

be

noted.

14.

If

the

proper

indication

is

obtained

on

the

meter,

the

tr

ansmitter

is

ready

for

CW

operation.

4-3.

TUNING

PROCEDURE

FOR

AM

OPERATION.

The

procedure

for

tuning the

transmitter

for

AM

operation

is

identical

to the

tuningproce-

MODULATION FREQUENCY APPROX.

75%

MODULATION

FREQUENCY

dure

for

CW

operation

in

Paragraph

4-2,

step

1

through

step

12

except

that

the

CW

key

need

not

be

plugged in. The following

procedure

will

complete

the tuning of

the

transmitter

for

AM

operation:

1. Connect the

microphone

to

the

MIKE

connector

on the

rear

of the

chassis.

2. Rotate the FUNCTION

control

to

AM;

note

the

meter

indication,

it

should

be

approximately

one

fourth

the

indication

noted

in

step

11

of

paragraph

4-2.

3. While

talking

in

a

normal

voice

level

at

the

desired

distance

from

the

micro-

phone and

observing

the modulation

in-

dicator

lamp,

advance the MIKE GAIN

control

clockwise

until

the

indicator

lamp

just

flickers

on and off.

This

pro-

vides

75%

to

90%

AM

modulation.

Never

over-modulate

the

transmitter.

Over-modulation

will

be

indicated

by

continuous

bright

flickering

of

the

mod-

ulation

indicator

lamp.

4-4.

SERVICE

OR

OPERATING

QUESTIONS.

For

any

further

information

regarding

op-

eration

of

the

transmitter,

contact

your

Halli-

crafters

dealer.

The

Hallicrafters

Company

main-

tains

an

extensive

system

of

authorized

service

centers

where

any

required

service

will

be

per-

formed

promptly

and

efficiently

at

a

nominal

\J

MODULATION FREQUENCY

100

% MODUL.ATION

OVER

100%

MODULATION

092-010131

Figure

7.

Carrier

Modulation

Patterns.

8

Hallicrafters HT-40 MK1 Training manual

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