Hammarlund HX-50 - Introduction to the HX-500 Transmitter

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INTRODUCTION

The

HX-500

Exciter-Transmitter

is

a

self

con-

tained

unit

designed

with your

present

and

future

requirements

in

mind.

The

transmitter

is

completely

self

contained;

employing

21

tubes

(plus

four

semi-

conductor

diodes),

and

requires

only

the

addition

of

a

suitable

mike,

key,

or

bug

and

suitable

antenna

system

for

immediate"

on

the

air"

operation.

This

Transmitter-Exciter

covers,

80,

40,

20,

15

and 10

meter

amateur

bands

by

means

of

an

eight

position

rotary

bandswitch.

Four

bandswitch

posi-

tions

are

provided

for

complete

coverage

of

the

10

meter

band

and

the

built-in

VFO

covers

a

range

of

500

KC's.

The

eight

crystals

needed

for

complete

band

coverage

are

supplied.

The

rotating

drum, il-

luminated

slide

rule

dial

is

calibrated

to

indicate

better

than

10

KC's

and

the

tuning

knob

skirt

can

be

read

to

better

th an 200

cycles.

One

rotation

of

the

frequency

knob

covers

two

divisions

or 20 KCS on

the

illuminated

dial

drum.

The

unit

is

capabie

of

transmitting

the

following

types

of

signals:

LSB,

USB, DSB,

CW,

FM, and

FSK.

The

power

output

on SSB

is

70-100

watts;

70-100

watts

on

CW,

FSK,

FM

and 17-25

watts

on DSB (AM).

The

carrier

suppression

on

both

USB and

LSB

is

greater

than -50 db and

the

unwanted

sideband

is

rej

ected

by more

than

-50

db.

Spurious

frequencies

generated

within

the

unit

are

suppressed

to

a

level

of

-50

db or more.

The

intermodulation

distortion

products

have

been

suppressed

beyond

the

-30

db

level.

The

transmitter

output

pi-network

has

been

care-

fully

designed

to match a

52

ohm

transmission

cable

impedance

and

suppress

harmonic

TVI.

A

logarithmic

type

of

carrier

level

indicator

pro-

vides

a very

simple

yet

adequate

means

of

tuning

up and

continuously

monitoring

the

transmitter.

The

VOX

circuit

adjustments

(Sensi

tivity,

Delay

and

Anti-Trip)

are

located

on

the

front

panel.

The

single

sideband

signal

is

generated

III

the

HX-500

Transmitter-Exciter

by

means

of

a

highly

stable

60

KC

oscillator

whose

signal

is

fed

into

a

carefully

balan

ced

diode

modul

ator

and

subse-

quently

applied

to a

series

of

cascaded

overcoupled

and

under

coupled

tuned

circuits

(with

carrier

re-

jection

trap) which

provides

the

necessary

unwanted

sideband

rejection.

The

choice

of

LSB,

USB, or

DSB

transmission

is

determined

by

the

position

of

the

function

switch

which

shifts

the

resonant

fre-

quencies

of

the

60

KC

tuned

circuits

to

provide

the

proper

bandwidth

for

the

desired

mode

of

operation.

All

of the

controls

that

are

required

for

proper

tune

up and

operation

of

the

Transmitter-Exciter

are

provided

on

it's

front

panel

and

these

controls

are

logically

grouped

for maximum

operating

ease.

The

HX-500

was

designed

with you in mind. You

will

find

many

hours

of

pleasure

in

operating

this

truly

fine

communications

instrument.

Page

2

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