Plessey PRC 320/1 - Page 96

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2.2.5

REF.

-

the

reflected

power

in

the

antenna.

For

an

acceptable

matching

accuracy

the

ratio

of

reflected

to

forward

power

should

be

better

than

1:8.

(А

ratio

of

1:2.5

or

worse

causes

the

PV1518

red

FAULT

lamp

to

light,

indicating

that

the

antenna

system

may

have been

damaged

or

its

impedance

altered

by

the

proximity

of

conducting

structures.

Тһе

fault

should

be

rectified

and,

if

the

antenna

is

fed

via

the

ATU,

the

system

should

be

re-tuned

as

shown

in

Fig.4).

5.2.4

SUPPLY

VOLTS

-

the

d.c.

supply

voltage

to

the

equipment,

which

should

be

within

the

range

20V

to

327

for

satisfactory

operation.

5.5

Set

the

PV1511

function

swtich

to

AMPLIFIER,

depress

the

pressel

switch

and

check

the

equipment

as.

Shown

in

Fig.5

84

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