Icom IC-F4TR Guide

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
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
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
ADJUSTMENT CONDITIONS
MEASUREMENT VALUE