SEA 222 - The Power Connector; Terminal Function

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4.3

4.3.1

4.3.2

4.3.3

Any

radio conununications system

operating

in

the

MF-HF

spectrum

MUST

have

an

adequate ground

connection,

otherwise

the

overall

efficiency

of

the

radio

installation

is

degraded.

In

extreme

cases,

it

may

be

impossible

to

properly

load

the

radiotelephone

int!>

the

antenna.

The

50

Ohm

output

impedance

of

the

SEA

222 makes

it

necessary

to

employ

an

antenna system

of

the

resonant

or

externally

matched

type.

The

use

of

the

SEA

1612

antenna coupler

in

conjunction with a

whip

antenna allows

an

effiecient

installation

which

will

cover both

the

MF

and

HF

bands.

The

SEA

1612

was

designed

specifically

for

Marine

applications

and

will

easily

in.terface

with

the

transceiver.

On

wooden

or

fiberglass

boats,

the

use

of

copper

ground

plate

or

the

keel

on

a

sailboat

perform

adequately.

The

ground system

~UST

be

joined

to

the

antenna coupler with a heavy copper

strap.

REAR

PANEL

CONNECTIONS

AND

FUSES

THE

POWER

CONNECTOR

A

heavy

duty

power

plug

is

employed

on

the

SEA

222

to

assure

minimum

voltage

drop

in

the

primary

power

circuit.

See Figure

4.3.1

for proper

assembly of

the

power

plug •

THE

RF

CONNECTOR

One

type

of

VHF

female

connector

is

provided

on

the

SEA

222

rear

panel.

The

output impedance

of

this

transceiver

if

50

Ohms.

The

most

conunon

types of coaxial

cables

used

are

RG-58C/U

·and

RG-213/U.

The

correct

mating plug

is

the

PL-259

or

Amphenol

83-lSP.

THE

REMOTE

PLUG

A nine

contact

screw terminal type plug

is

provided

on

the

SEA

222

rear

panel,

Figure

4.3.3,

to

allow

the

installation

of

an

extension

(simple remote),

an

external

loudspeaker or a handset. Also provided

i·s

the

switched, fused primary

power

(13.6 Volts)

to

operate

an

antenna

coupler, along with

an

"all

tuned"

flag

line.

TERMINAL

FUNCTION

AF

- Output of

the

audio

power

amplifier,-

AC

coupled. Speaker impe-

dance

to

be

used

is

3.2

Ohms

or

more.

SPKR

-

Internal

speaker

input.

A jumper

to

AF

is

needed

to

operate

the

internal

loudspeaker.

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