Icom IC-M422 - Transmit Adjustment Procedures

5 - 3
ADJUSTMENT ADJUSTMENT CONDITION
MEASUREMENT
VALUE
ADJUSTMENT
POINT
UNIT OPERATION UNIT ADJUST
OUTPUT
POWER
1 • Channel : CH16 (156.800 MHz)
• Output power : High
• Transmitting
Rear
Panel
Connect an RF power
meter to the antenna
connector.
23–23.5 W MAIN R112
FREQUENCY
DEVIATION
1 • Channel : CH16 (156.800 MHz)
• Output power : Low
• Connect an audio generator to the pin 28
of J4 (MAIN UNIT) and set as;
Frequency : 1 kHz
Level : 30 mV
• Set the FM deviation meter as;
HPF : OFF
LPF : 20 kHz
De-emphasis: OFF
Detector : (P−P)/2
• Transmitting
Rear
Panel
Connect an FM
deviation meter to the
antenna con-nector
through an attenuator.
±4.25–4.35 kHz MAIN R327
R112
R327
Output power adjustment
Frequency deviation
adjustment
+
–
+
–
AC millivoltmeter
Audio generator
J4
29
28
5-3 TRANSMIT ADJUSTMENT