4-3 PA AND FILTER UNITS ADJUSTMENT

 

ADJUSTMENT

ADJUSTMENT CONDITIONS

 

MEASUREMENT

VALUE

ADJUSTMENT

 

 

 

 

 

 

 

UNIT

 

LOCATION

UNIT

ADJUST

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

IDLING

1

• Operating frequency

: 12.2350 MHz

Rear

 

Connect

an ammeter

2.0 A

PA

R6304

 

CURRENT

 

• Mode

: J3E

panel

 

(10 A)

between an

 

 

 

 

(For drive

 

• Apply no audio signal to the [MICRO-

 

 

external power supply

 

 

 

 

FETs)

 

PHONE] connector.

 

 

 

and the transceiver.

 

 

 

 

 

 

• Disconnect J6702.

 

 

 

 

 

 

 

 

 

 

 

• Preset R6304 and R6412 on the PA

 

 

 

 

 

 

 

 

 

 

unit to max. counter clockwise.

 

 

 

 

 

 

 

 

 

 

• Connect a dummy load or RF power

 

 

 

 

 

 

 

 

 

 

meter to the [ANT] connector.

 

 

 

 

 

 

 

 

 

 

• Transmitting

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

(For final

2

• Transmitting

 

 

 

 

 

0.7 A

 

R6412

 

transistors)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

• After adjustment, connect J6701 to the PA unit.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

SWR

1

• Operating frequency

: 22.0000 MHz

Rear

 

Connect an RF power

140 W

Audio

Output

 

DETECTOR

 

• Mode

: J3E

panel

 

meter to the [ANT]

 

gen-

level

 

 

 

• Connect the CP7332 (FOR line) on

 

 

connector.

 

erator

 

 

 

 

the FILTER unit to ground.

 

 

 

 

 

 

 

 

 

2

 

 

 

 

 

 

 

 

 

• Connect an audio generator to the

FIL-

 

Connect a DC volt-

Minimum level

FIL-

C7275

 

 

 

[MICROPHONE] connector and set

TER

 

meter to check point,

 

TER

 

 

 

 

as:

 

 

 

CP7331.

 

 

 

 

 

 

 

Frequency

: 1.5 kHz

 

 

 

 

 

 

 

 

 

 

• Transmitting

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

• After adjustment, disconnect CP7332 (FOR line) on the FILTER unit from ground.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

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