Icom IC-F4TR Guida

ADJUSTMENT PROCEDURES

PLL ADJUSTMENT for IC-F4TR

UNIT LOCATION UNIT ADJUST

PLL LOCK 1Operating freq: MAIN Connect a multimeter 1.3 V MAIN L11

VOLTAGE 400.000 MHz to check point CP1.

Receiving

2Operating freq: L405

400.000 MHz

Transmitting

3Operating freq: 3.5V- Verify

430.000 MHz 4.5V

Receiving

4Operating freq:

430.000 MHz

Transmitting

ADJUSTMENT

ADJUSTMENT CONDITIONS

MEASUREMENT VALUE

TRIMMER ADJUSTMENT for IC-F4TR

ADJUSTMENT

UNIT LOCATION

REFERENCE

1Operating freq: Top Loosely couple a 430.000000 MHz push[up]or[down]

FREQUENCY 430.000 MHz panel frequency counter keys on the com-

Transmitting to the antenna puter key-board.

connector

OUTPUT 1Operating freq: Top Connected comput- 80 push[up]or[down]

POWER 400.000 MHz panel er screen "Power keys on the com-

High/Low switch:High (Hi)". puter key-board.

2Transmitting Connect an RFpower Maximum output Adjust C467 on

meter to the ante- the MAIN unit.

nna connector. (see detailed

illustration at

right)

3Operating freq: 4.2 W push[up]or[down]

415.000 MHz keys on the com-

High/Low switch:High puter key-board.

Transmitting

4High/Low switch:Low 0.5W-2.0W Verify

Transmitting

BPF1-BPF4 1Operating freq: Top Connect an SSG to Minimum distor- push[up]or[down]

400.000 MHz panel the antenna conne- tion level keys on the com-

Set the SSG as: ctor and a SINAD puter key-board.

Level :+20dBuV meter with 8 ohm

Modulation :1kHz load to the [SP]

Deviation :3.0kHz(W) jack.

:1.5kHz(N)

Receiving

ADJUSTMENT

ADJUSTMENT CONDITIONS

MEASUREMENT VALUE

TRANSMITTER ADJUSTMENT for IC-F4TR

UNIT LOCATION UNIT ADJUST

FM 1Operating freq: Top Connect an FM devia- Set to MAIN R119

BALANCE 415.000 MHz panel tion meter to the an- flat wave

tenna connector thro-

gh an attenuator.

FM 1Operating freq: Top Connect an FM devia- 3.5kHz MAIN R564

DEVIATION 415.000 MHz panel tion meter to the

Wide/Narrow switch:Wide antenna connector

Connect an audio genera- through sn attenuator

tor to the [MIC]jack and

set as:

1kHz/100mV

Set an FM deviation

meter as:

HPF :OFF

LPF :20kHz

De-emphasis :OFF

Detector :(P-P)/2

Transmitting

ADJUSTMENT

ADJUSTMENT CONDITIONS

MEASUREMENT VALUE

RECEIVER ADJUSTMENT for IC-F4TR

UNIT LOCATION UNIT ADJUST

SQUELCH 1Operating freq: Top Connect an SSG to 12dB SINAD SSG Output

LEVEL 415.000 MHz panel the antenna connector level

Wide/Narrow switch:Wide and SINAD meter with

Set the SSG as: an 8ohm load to the

Modulation :1kHz antenna connector

Deviation :3.0kHz

Receiving

2Turn R92 clockwise to At the point MAIN R92

close squelch where the au-

Receiving dio signals

just appears.

ADJUSTMENT

ADJUSTMENT CONDITIONS

MEASUREMENT VALUE

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