Continental Electronics 816R - Page 31

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In

the

following

steps

you

will

start

with

low

IPA

output

power

and

with

zero

or

minimum

plate

voltage.

You

will

adjust

Grid

Tuning

and

Coupling

as

you

slowly

increase

drive

power

until

normal

drive

power

is

reached

and

then

you

will

slowly

increase

plate

voltage

while

adjusting

Grid

Tuning

and

Coupling

until

normal

operating

plate

voltage

is

reached.

Keep

the

IPA

Reflected

Power

to

a

minimum

as

you

make

adjustments

to

IPA

power

output

and

plate

voltage.

9.

Restore

primary

power

to

the

transmitter

and

turn

the

Filament

control

ON.

10.

Set

the

Exciter

Power

Output

Adjustment

fully

CCW.

11.

Press

the

Exciter

MUTE

Switch.

Turn

Plate

control

ON

and

reduce

the

plate

voltage

to

zero

or

to

minimum

with

the

Manual

Power

Control.

12.

Release

the

Exciter

MUTE

switch

and

slowly

increase

the

Exciter

output

while

watching

the

IPA

Reflected

Power.

Do

not

let

the

IPA

Reflected

power

exceed

60

watts.

13.

Adjust

the

PA

Grid

Tuning

and

Coupling

for

minimum

IPA

Reflected

Power

as

the

Exciter

output

is

increased

to

normal.

DO

NOT

EXCEED

20

AMPERES

ON

IPA

COLLECTOR

CURRENT.

The

normal

range

of

IPA

Collector

current

is

18

-

20

Amps.

14.

Slowly

increase

the

plate

voltage

with

the

Manual

Power

Control.

You

will

notice

that

the

IPA

Reflected

Power

will

increase

as

the

plate

voltage

is

increased.

Adjust

the

Grid

Tuning

and

Coupling

to

keep

the

IPA

Reflected

Power

at

minimum

as

the

plate

voltage

is

increased

toward

maximum.

15.

This

completes

the

adjustment

procedure.

Restore

the

transmitter

to

normal

configuration.

NOTE:

The

816R-2C,

3C,

4C,

and

5C

transmitters

do

not

use

the

150

watt

driver

and

the

normal

exciter

output

will

be

in

the

range

of

20

to

35

watts.

The

Exciter

RF

output

will

be

10

watts

if

the

IPA

power

output

is

controlled

by

the

collector

voltage

on

the

150

watt

Driver.

The

Driver

collector

voltage

and

the

IPA

output

is

set

by

adjustment

of

R40

on

the

IPA

Meter

Board.

The

Exciter

output

will

be

approximately

seven

watts

if

the

IPA

output

is

controlled

by

the

Exciter

RF

Output

Level

Control

only

and

the

transmiter

uses

the

150

driver

module.

Please

contact

Continental

Technical

Support

at

(214)

388-5800

if

you

have

questions

about

this

Information

Letter.

CONTINENTAL

ELECTRONICS

TECHNICAL

SUPPORT

PHONE

(214)388-5800

FAX

(214)381-7949

27