Plessey PRC 320/1 - Page 32

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CARRYING

POSITION

2.5

The

correction

carrying

position

for

the

manpack

is

as

shown

in

Fig.1

(page

xii).

OPERATING

INFORMATION

2.6

Set

up

and

tune

the

PRC320/1

as

shown

in

Fig.6.

ANTENNA

TUNING

2.7

The

settings

of

the

RANGE

AND

LOAD

SWITCHES

on

the

RT220/1

antenna

tuning

unit

(ATU)

are

determined

by

the

operating

frequency

and

the

type

of

antenna

(various

configurations

are

described

in

para.2.12

to

2.17),

as

shown

in

the

ATU

RANGE

AND

LOADING

TABLE

(Fig.7,

page

24)

on

the

equipment

case.

Switch

Settings

for

V

dipole

and

vehicle

4m

whip

antennas

are

not

given

in

this

table

and

form

the

subject

of

a

Separate

table,

also

illustrated

in

Fig.7.

The

method

of

using

the

tables

is

as

follows:-

2.7.1

Determine

which

block

in

the

appropriate

ANTENNA

column

corresponds

with

the

selected

operating

frequency

in

the

FREQ

MHz

column

and

initially

set

the

RANGE

and

LOAD

switches

respectively

to

the

letter

and

number

given

in

the

block,

e.g.

if

the

operating

frequency

is

5.763

MHz,

commence

tuning

with

the

switches

set

to

B

and

5

respectively

when

using

the

manpack

whip

antenna,

B

and

6

with

the

5.5m

vertical

antenna

and

B

and

2

with

the

vehicle

3m

and

4m

whip

antennas.

When

using

the

7.9m

vertical

antenna,

set

the

switches

to

B

and

the

position

between

6

and

9

inclusive

which

enables

the

highest

meter

reading

to

be

achieved

when

adjusting

the

TUNE

control.

Complete

the

tuning

procedure

as

indicated

in

Fig.6.

20

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