Transmit Adjustment - Icom IC-M304 Service Manual

5-3 TRANSMIT ADJUSTMENT

ADJUSTMENT ADJUSTMENT CONDITION
TRANSMIT 1 • Channel
OUTPUT • Output power
POWER • Connect an RF power meter to the ant-
enna connector.
• Transmitting
DEVIATION 1 • Channel
• Output power
• Connect an audio generator to the 'MIC'
line (see the picture below), and set as;
Frequency
Level
• Connect an FM deviation meter to the ant-
enna connector through an attenuator,
and set as ;
HPF
LPF
De-emphasis : OFF
Detector
• Transmitting
• ADJUST&CHECK POINTS LOCATION (TRANSMIT)
Audio generator
AC millivoltmeter
: CH16 (156.800 MHz)
: High
: CH16 (156.800 MHz)
: Low
: 1 kHz
: 140 mV
: OFF
: 20 kHz
: (P–P)/2
J2
1 5
R184 (DEV)
DEVIATION
ADJUSTMENT POINT
–
[PTT]
+
–
+
OPERATION
Adjust R135 (PWR).
Adjust R184 (DEV).
R135 (PWR)
TRANSMIT OUTPUT POWER
ADJUSTMENT POINT
5 - 3
VALUE
23.5 W
±4.3 kHz