Hammarlund HX-50 - Installation and Connections; Power, Antenna, and Relay Connections

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INSTALLATION

UNPACKING

After

unpa~king

the

transmitter

carefully,

make

sure

that

all

tubes,

associated

tube

shields,

and

pilot

lamps

are

properly

seated

in

their

respective

!!lockets.

Inspect

the

unit

for

any

signs

of

damage

during

shipment

and

carefully

read

all

tags

and

labels

for

any

special

instructions

before

discarding

them.

MONI'TOR

JACK

The

microphone

and

key

connections

to

the

trans-

mitter

are

located

along

the

bottom

edge

of

the

trans-

mitter

panel.

A

standard

microphone

connector

such

as

the

Amphenol

type

75-MCIF

or

equivalent

is

required

to

connect

the

microphone

to

the

transmitter.

Any

high

impedance

microphone,

either

crystal

or

dynamic,

will

give

satisfactory

results

when

used

with

this

transmitter.

The

key

or

"bug"

is

con-

nected

to

the

front

panel

receptacle

by

means

of

a

standard

two

contact

phone

plug.

The

key

or

"bug"

may

be

connected

to

the

remote

control

plug,

lo-

cated

at

the

rear

of

the

chassis,

instead

of

the

front

panel

if

desired.

See

Fig.

2 for

remote

key

connec-

tions

on

the

14

prong

plug

located

at

the

rear

apron

of

chassis.

MICROPHONE

&

KEY

CONNECTIONS

The

monitor

jack

provides

a

means

of

listening

to

the

received

signals.

Any

headset

fitted

with

a

standard

two

conductor

phone

plug

can

be

used.

When

the

phones

are

plugged

into

the

receptacle,

the

communications

receiver

speaker

will

be

disabled,

provided

that

the

receiver

output

and

speaker

are

wired

as

shown

in

Fig.

2.

PHONE

PATCH

The

phone

patch

jack

requires

a

standard

two

conductor

phone

plug.

This

input

receptacle

is

con-

nected

directly

across

the

high

impedance

audio

level

control.

Any of

the

phone

patches

available

should

be

useable

when

the

output

is

fed

into

this

jack

(on

the

assumption

that

sufficient

gain

has

been

provided

in

the

patch).

Page

4

117

VOLT

POWER

CONNECTION

Before

inserting

the

line

cord

plug

into

the

power

outlet,

make

certain

that

the

power

source

is

of

the

proper

voltage

and

frequency.

The

Model HX-500

Transmitter-Exciter

is

designed

to

operate

on

105-125

volts,

50-60

cycles

A.C.

Do

not

under

any

circumstances,

connect

this

unit

to

a

source

of

direct

current

as

doing

so

will

blow

the

fuse.

ANTENINA

CONNECTION

The

output

impedance

of

the

HX-500

is

'50

Ohms.

A

suitable

RF

cable

and

cable

connector

is

RG-8/u

coaxial

cable

with

an

Amphenol

type

83-1SP

or

equivalent

coaxial

cable

connector.

The

selection

of

the

type

of

antenna

and

coupler

will

depend

upon

the

band

of

operation

and

the

ob-

jectives

of

the

user.

The

ARRL

publications

are

an

excellent

source

for

information

on

the

design

and

construction

of

various

types

of

antenna

systems.

ANTENNA

RELAY

The

HX-500

is

equipped

with

an

internal

antenna

changeover

relay.

The

typical

Send-Receive

connec-

tions

are

illustrated

in

Fig.

2.A

stanaard

phonograph

plug

is

required

for

the

receiver

connections

to

the

changeover

relay

contacts.

RECEIVER

AUDIO

CONNECTIONS

In

order

to

have

the

VOX

relay

control

the

signals

from

the

station

receiver's

loud

speaker,

the

HX-500

Transmitter

must

be

connected

to

the

station

receiver

as

shown

in

Fig.

2.

In

many

cases

the

blocking

bias

connections

will

be

needed

to

put

the

receiver

in

standby

in

place

of

the

"make

and

break"

contacts

as

shown

in

the

Figure.

BLOCKIING

BIAS

CONINECTIIONIS

A

high

impedance

bias

source

(-lOOV.)

is

provided

to

silence

the

station

receiver

during

periods

of

transmission.

Pin

6 of

the

rear

receptacle

supplies

this

voltage

when

the

VOX

relay

is

energized,

(transmit

position)

and

grounded

in

the

normally

open

position.

Pin

7

is

a

suitable

groun?

connection

for

running

a

shielded

lead

to

the

receiver

if

it

be-

comes

necessary

to

minimize

RF

pick

up

in

the

lead.

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