Hallicrafters HT-40 MK1, HT-40K MK1 Operating And Service Instructions

allicraliers

OPERATING

AND

MODEL

SERVICE

COMMUNICATIONS

INSTRUCTIONS

TRANSMITTER

HT

-40

MARK

I

"The Hallicrafter's Company warrants each new radio product manu­factured by it to be
and agrees to remedy any
change

for

any part

free.

from defective material and workmanship
such defect or to furnish a new part in ex-

of

any unit of its manufacture which under

nor­mal instaliation, use and service discloses such defect, provided the
unit

is

delivered by the owner to our authorized radio dealer, whole­saler, from whom purchased,
examination, with

all

days from the date

or,

authorized service center, intact,

transportation charges prepaid within ninety

of

sale to original purchaser and provided that

for

such examination discloses in our ;udgment that it is thus defective.
This warranty does not extend

have been sub;ected

to

our own, improper installation,

to

any

of

our radio products which

misuse, neglect, accident, incorrect wiring not

or

to use in violation

of

instructions

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

altered outside

where the serial number thereof

nor

to accessories used therewith not

Any

part

be remedied

of

our factory or authorized service center, nor to cases

of

a unit approved

or exchanged

liaS

been removed, defaced or changed,

of

our own manufacture.

for

remedy

or

by

the authorized radio dealer

exchange hereunder will

or

whole-

saler without charge to the owner.

This warranty
and no representative or person
other liability in connection with the sale

is in lieu

of

all other warranties expressed or implied

is

authorized to assume

of

our radio products:'

for

us any

or

092-01266~

1-1.

HT-40K
transmitter
l
on
The only r
air"
nated
or
source

1-2.

structed
ca
problem
c
parts.
control cir
were

INTRODUCTION.

The

MK1

ated)

and

the

80,

operation

antenna, a crystal

microphone

.

T.V.I.

The

to

use

television

has

ircuit

design

Adequate

specifically

Hallicrafte

kit

is a four-tube,

capable

CW

(continuous

40,

20,

equirements

are a 50-ohm

and a 117-volt,

SUPPRESSION.

transmitter

suppress

interference

been

given

and

in

filtering

cui

ts

and

AC

selected

r s

Model

of

AM

15,

10,

for

or

has

been

spurious

full

the

selection

has

power

to

Figure

GENERAL

HT-40

self-contained

(amplitude

wave)

immediate

external

consideration

avoid

transmission

and 6 meter

to

75-ohm

VFO, a key

60-CPS,

designed

radiations

(T.V.I.).

been
lines.

The

and
provided

Components

undesired

1.

View

SECTION

MK1

or

modu-

bands.

"on-the-

termi-

AC

power

and

con

that

may

T.V.1.

in

the

layout

of

for

re-

of

Transmitter.

I

DESCRIPTION

sonances

cillation.

Another

is

employed

final

amplifier.

network

suppression
nected
of

all

ohms

tory,

-

vanced
ference.
which

itse

maximum

mitter,
the

antenna

which

to a coaxial connector
antenna
to

75

The

has

engineering

There are,

cannot

lf.

Therefore,

a low

transmitter output

feed

and

arranged

important

in

the

The

has

capabi

systems

ohms.

transmitter,

every

T.

be

prevented

V.1.

-pass

line.

advantage

free

to

prevent

T.V.1.

output

excellent

lit

to

however,

it

coup

tuned

filter

output circuit

y.

The

having

as rec

minimize

within

is

recommended

operation

be

connector and

proofing

ling circuit

inherent

pi

network

and

permits

an

impedance

eived

of Halli

television

some

types

the

of

installed

parasitic os-

feature

to

the

is a pi

harm

onic

is

con-

the

use

of

from

the fac

crafters

transmitter

your

the

ad-

inter-

of

T.

V.l.

that,

for

trans-

between

coaxia

50

-

l

TECHNICAL

SPECIFICATIONS

TYPES

FREQUENCY
FREQUENCy
POWER

AUDIO
DISTORTION •
HUM AND NOISE OUTPUT • • • • • • • • • • • • • • 40 DB
TUBES
POWER
OUTPUT

POWER

OF

EMISSION

AM

• •

••

••••

cw

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

SELECTION
COVERAGE • • • • • •

INPUT

AM

••••

CW

••••

INPUT

•••••••••••

SOURCE • • • • •

COUPLING • •

CONSUMPTION • • • • • • •

•.•.••••••

••••••••

•

••••••••••••••••

•••

Amplitude

.

•••••

• • •

Continuous

• • •

Crystal

• 80, 40, 20, 15, 10,

•

••

75

watts

75

watts

0.004 V

••

8%

•

••
.•

at

•

Four,
105-125
Pi

network

175

watts

modulation

wave

controlled

peak

maximum

minimum

75%

modulation

or

more

plus

two

volts,

or

and 6 meter

power

at

input

below

silicon

60 CPS,

external

to

microphone

maximum

rectifiers

AC

VFO

bands

jack

output

RF

OUTPUT IMPEDANCE

CW

KEYING.

MICROPHONE

DIMENSIONS • • • • • •
NET

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

SHIPPING

Band

80
40 7

20 14
15

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

INPUT.

WEIGHT • • • • • • • •

Transmitter

••••••••.•••••

• •

••

3.5

MC

MC

MC

21 MC

•••••••••••

•••••••••••

FREQUENCY COVERAGE

Frequency

to 4 MC

to

7.3

to

14.35

to

21.45 MC 7000 KC

Range

MC

MC

•••

50

to

75

ohm

phenol

Panel

connector

Rear

Amphenol

7-3/16"

19

83-1SP

mounted

chassis

pounds
pounds

coaxial

1/4"

mounted

75-MC1F

high,

13-3/8"

Crystal

connector

connector

key

jack

accepts

plug

microphone

connector

wide,

or

VFO
3500 KC
7000 KC to 7300

7000 KC

to

to
to

accepts

standard

receptacle

8-1/4"

Frequency

4000 KC

KC

7175 KC
7150 KC

Am-

2-

deep

Range

10

6 50

Note:

1000 KC = 1 MC

2

28 MC

MC

to

29.7 MC 7000 KC

to

54 MC 8333 KC

to

7425 KC

to

9000 KC

SECTION

II

INSTALLATION

2-1.

UNPACKING.

Mter

it

closely
occurred
be
carrier
check

during

apparent,

stating

all

structions

2-2.

LOCATION.

The

provides

adequate
circulation
Avoid
on

2-3.

excessively

or

near

POWER

The

105-volt

to

consumption

If

in
contact
prior

an

AC
er

cord
can
unit,

2-4.

CRYSTAL-VFO

The

two

pin

jacks,

commodate

separation

unpacking

for

any

possible

transit.

file a claim

the

shipping

before

unit

of

removing

should

air

radiators

SOURCE.

transmitter

125-volt,

is

175

IMPORTANT

doubt

your

to

inserting

power

into

cause

extensive

requiring

CRYST

mounted

.093

"diameter

(similar

extent

labels

be

space

through

warm

and

60

watts.

about

local

outlet.
the

wrong

costly

AL-

VFO

to

type

the

transmitter,

damage

Should

which

any
immediately
of

damage.

and

tags

or

destroying

placed

around

in a location

it

the

cabinet

locations

heating

is

designed

cycle,

the

vents.

AC

power

current.

power

the

power

Plugging

power

damage

repairs.

RECEPTACLE.

receptacle

on

the

front

pins

with

FT-243

crystal

examine

may

sign

of

with

Carefully

for

special

to

permit

openings.

such

as

to

operate

source,

company

plug

into

the

pow-

source

to

the

consists

panel,

1/2"

have

damage

the

in-

them.

that

free

those

on

Power

of

to

ac-

center

holder).

When

high

(hot)

jack

and

2-5.

The
closed
provides
or

an

automatic
the

KEY
nected
strip

located

tacts

are

when

the

2-8).

2-6.

rear

of
bulkhead
type

75-MC1F

2-7.

tenna
radiate
figure
BOOK

mation

2-8.

chassis

auxiliary

position
When
TUNE,

are

r----

I

L

(FEET)

• I

FREQUENCY

468

(MC)

I

not
and 2 are
an

antenna

switch

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

COAXIAL LEAD

figure

parallel
plug

is
transmitter
switching
remote
push-to-talk

4),

The

key

to

ation

or

must

be

ing

wire

Figure

2.

Coaxial

Dipole

Feci

Half-Wave

Antenna.

092-010130C

an

external

side

of

the

the

ground

KEY

RECEPTACLE.

KEY

jack, a standard

circuit

for

type

the

connection

keyer

jack,

the

keying

to

terminals 3 and

on

the

rear

connected

plug

is

removed

MICROPHONE

The

microphone

the

chassis,

receptacle

microphone

ANTENNAS.

It

is

suggested

fed

with a 50-ohm

maximum

2).

Refer

or

similar

concerning

ACCESSORY

A

four-terminal
permits

power

to

publications

transmitting

connecting

equipments.

The

FUNCTION

electrically

the

FUNCTION

or

STANDBY

electrically

connected

changeover

controls

the

3).

Terminals

with)

removed

device

control

the

to

3

KEY

from

be

connected

such

switch,

switch

transmitter

terminals 3 and

keying
removed

from

from

removed

VFO

is

used,

VFO

output

side

to

the

black

jack

located

(T.O.

on

of

ahandkeyer, a bug,

Keyer).

instrument

4 of

the

of

the

chassis.

in

parallel

with

from

the

CONNECTOR.

connector,

is

an

Amphenol

and

will

accept

plug.

that a half-wave

the

coaxial

from

ARRL

cable

the

transmitter

ANTENNA HAND-

for

antennas.

TERMINAL

strip

on

the

the

switch
connects
switch

position,

connected.

to

auxiliary

operation

in

the

terminals 1 and

is

in

either

these
When
equipment

relay,

the

of

and 4 connected

jack

terminals,

the

KEY

jack,

to a remote

as

the

SX-140

or

separate

on

the

microphone

may

be

keyed

4.

For

remote

these

terminals,

the

KEY

jack

from

terminals

connect

to

the

pin

red

jack.

the
pin

two-conductor,

the

fro'"'t

panel,

In

addition

may

be

con-

four-terminal

These

the

jack

located

type

an

con-

KEY

jack

(see

para.

on

the

75-PC1M

Amphenol

dipole
be

an-

used

(see

detailed

STRIP.

rear

infor-

of

the

transmitter

AM

or

CW

the

OFF,

terminals

terminals

such

FUNCTION

the

relay

across

permit

when

(see

(in
the
the

control

Receiver,

leads

from

the

(see

figure

by

connecting

control

and

the

the

3

oper-

key

short-

and

plug

to

to

to

2.

1

as

a

a

4.

3

SECTION

III

3-1.

tary

switch,

of

operation

FUNCTION

The

FUNCTION

is

used

as

1.

OFF
from

2. TUNE
oscillator
the

modulator
ges.
DRIVE
on

the

meter.

3.

ST

ANDBY

the

DC
from
is

made

refer

CONTROL.

control, a five-position

to

select

indicated.

position:

the

power

position:

and

Grid

current

control

RF

OUTPUT

position:

power

the

internal

for

to

paragraph

the

AC

power

transformer

power
buffer
and

final
is

for

maximum

the

supply

circuitry.

remote

2-8.

OPERATING

ro-

transmitter

is

disconnected

is

applied

stages

amplifier

adjusted

- GRID CURRENT

negative

is

disconnected

control

mode

primary.

to

the

but

not

to

sta-

with

the

indication

side

of

Provision

switching,

CONTROLS

A unique
allows
through
ST

ANDBY
better
ing

4.

5.

3-2.

The

multi-section

voltage

from

AM
oscillator,
final

CW
to the
and to the

screen

tube which, in the

as a series

BAND

BAND

NOTE

feature

current

the

to

bleeder

position,

regulation

STANDBY
position:

buffer,

amplifier

position:

buffer

oscillator

grid

through
regulator

SELECTOR

SELECTOR

rotary

switch

of

the

be

to

power

and

power
and

used

thus

final

CW

power

constantly

w

hen

supply

fed

in

the

providing

when

switch-

AM

or

CW.

is

applied

speech

amplifier,

modulator
is

applied

directly

amplifier

and

final

amplifier

the 6DE7

position

modulator

functions

tube.

CONTROL.

is a six-position,

to

select

the

to

the

stages.

plate,

pro-

SX -140

RECEIVER

CONTACTS

OF

FUNCTION

SWITCH

AUXILIARY

SWITCHING

CONTACTS

SWITCH CONTACTS SHOWN IN

OR

RECEIVING

POSITION

Figure

NORMAL

3.

Transmitter

Controlling

an

Antenna

HT -40

TRANSMITTER

CONTACTS OF
FUNCTION SWITCH

~

STANDBY

EXTERNAL

POWER SOURCE

Relay.

4

S x -

140

RECEIVER

HT -

40

TRANSMITTER

per

inductance

network

3-3.

used
This
capacitor
the
fier
is
output

3-4.

for

each

DRIVE

The

DRIVE

to tune the

control

of the

buffer

stage.

stage
Operation

impossible

frequency.

CRYSTAL-VFO

The CRYSTAL-VFO

switch
either
external

3-5.

which

crystal

VFO.

RF

OUTPUT-G'RID

SWITCH.

The

RF
a DPDT
switch

final

slide

the

meter

amplifier

load.

EXTERNAL

POWER

SOURCE

in

the

Figure

driver

and

4.

Transmitter

final

amplifier

band.

CONTROL.

control

plate

also

functions

pi

network

and the input

to tune to a

is a variable

circuit

of

this

harmonic

of the

as

between

control

buffer

the input tuning

the

to

the

final

is

of

such

the

SWITCH.

permits

controlled

switch

the

transmitter

or

is a SPDTslide

to

to

operate

CURRENT

OUTPUT-GRID CURRENT

switch

which

either

(6DQ5)

permits

into the

or

across

grid

the

operator

circuit

the

RF

pi

capacitor

stage.

output of

ampli-

that

it

desired

operate

from

an

switch

is
to

of the

output

Controllecl

3-6.

capacitor

which

matching

3-7.

capacitor
amplifier
quency.

3-8.

tentiometer
controls
audio

3-9.

functions

grid
the

to

flickering

SWITCH CONTACTS

OR

RECEIVING

by

Station

PLATE

The

adjusts

PLATE

The

Receiver.

LOADING

PLATE
in

LOADING

the output of the

the

the

transmitter

TUNING

PLATE

which

tunes

(6DQ5) to the

MIKE

GAIN

The MIKE GAIN

located

the audio Signal

amplifier

tube V3B.

MODULATION
INDICATOR.

The modulation and

as a voltage

of

the

transmitter

In

AM

indicate

on

6DE7

80%

regulator

is

keyed.

operation,

modulation when the

and off.

SHOWN

IN

NORMAL

POSITION

092-00962.9B

CONTROL.

control

pi

network

plate

load

to

impedance,

the

antenna.

CONTROL.

TUNING

the

control

plate

circuit

desired

operating

CONTROL.

control, a I-megohm

on the

rear

applied

AND

keying

reference

tube

the

indicator

of

to

KEYING

indicator
device

and

is a variable

section

thus

is a variable

of

the

final

fre-

po-

the

chassis,

the

grid

of the

lamp

for

the

will

dim

has

been

set

lamp

is

just

as

5

'"

::n

CQ

c:

;

~

....

..,

Q

::s

'"

3

-

CD

-

..,

."

..,

0

::s

-

."

Q

::s

CD

-

()

0

::s

..,

-

0

;;;-

PLATE

LOADING

TRANSMITTER

MODEL

HT-40

0

FUNCTION BAND SELECTOR DRIVE CRYSTAL

20

0

15

6

.@.

C.w.

STAND;~M~

TUNE

OFF

4@

80

PLATE

TUNING

•

R.F.

OUTPUT -GRID

r:=r

II

the

0

CRYSTAL

VFO

G

~

G

VFO GRID CURRENT

hallicrafters

R.

F.

OUTPUT

~

CURRENT

~

®

@

KEY

II

co.

092-

012051

SECTION

IV

OPERATION

4-1.

has

adjustment
does
ted

ments
mitter

4-2.

formed

CW

GENERAL.

The

tuning

been

simplified

to the

not

mean

successfully

are

made. A clean

requires

TUNING
CW

OPERATION.

The

following tuning

prior

mode.

procedure

in

desired

that

the

transmitter

when only

good

operating

PROCEDURE

to

operating

EQUIPMENT REQUffiED

1.

2.

50-ohm,

40-watt
Crystal

monic
desired
external

non-inductive

light

bulb

with

frequency

transmitting
VFO.

PROCEDURE

1.

Set

the

controls

MIKE

GAIN.

. . • .

FUNCTION . . . . .

BAND

SELECTOR

for

design

to

frequency.

rough

signal

from

technique.

procedure

the

transmitter

(see

its

fundamental

corresponding

frequency

as

indicated:

..

Maximum
clockwise

..

OFF

..

Desired

the

transmitter

permit

However,

may

tuning

any

FOR

must

dummy

figure

band

rapid

be

opera-

adjust-

trans-

be

per-

in

load

6).

or

har­to
or

counter-

this

the

or

the

an

3.

It

may

be

plug

into

at

this

time

the

transmitter.
necessary
closed

circuit

desirable

the KEY

to allow the

since

type when

to

jack

and

operator

However,

the

jack

insert

close

this

the

the

to

is

key
key

tune

is a normally

the

key

plug

not

is

removed.

4.

5.

Connect
connector
plug
utility

Set

allow
up,

the

the

dummy

on the

line

cord

rear

into a

load

chassis

outlet.

FUNCTION

control

approximately 5 minutes

then

set

FUNCTION

to

the

antenna

panel

and

117-volt,

AC

to STANDBY,

to

warm

control

to

TUNE.

6.

Adjust

flection

a

7.

RENT
Set

switch

8.

Rotate

In

steps

of

the

TUNING

which

Tuning knob

be

near

bands

20

to 6 meter

correct

DRIVE

on the

meter.

RF

to the
FUNCTION

9,10,

PLATE

controls

is

nearest

dials.

100 on

and

progressively

setting

control

RF

for

OUTPUT-GRID

OUTPUT-GRID

RF

OUTPUT

control

NOTE

and

11

the

final

LOADING and

will

be

the

the 100

These

the

mark

settings

80 and 40

lower

bands.

will

On 6

be

between

meters,

maximum

CUR-

CURRENT

position.
to CW.

settings

PLATE

setting

on

the

will

meter

on

the
the

0 and

de-

20.

DRIVE . . . . • . . .

CRYSTAL­RF

OUTPUT-GRID..

VFO

CURRENT
PLATE

80
10

PLATE

80
10

2.

LOADING

to

20

meter

and 6 meter

TUNING

to

20

meter

and 6

meter

Insert
the

crystal

CRYST

bands

band

bands

band

AL-

. .

of

..
..

::

..
..

desired

VFO

Center

of
CRYSTAL
GRID

CURRENT

Near

100

Near

0

Near

100

Near

0

frequency

socket.

range

into

Figure

6.

Light

Bulb

Used

as

092-

Dummy

0101528

Load.

7