Transmitter Adjustments - Icom IC-M502 Service Manual

5-3 TRANSMITTER ADJUSTMENTS

ADJUSTMENT ADJUSTMENT CONDITION
OUTPUT 1 • Operating channel : ch16
POWER • Output power
• Transmitting
1 • Operating channel : ch16
FREQUENCY
DEVIATION • Output power
• Connect an audio generator to J7
(pin 5) with an AC millivoltmeter
and set as:
Frequency
Level
• Set an FM deviation meter as:
HPF
LPF
De-emphasis
Detector
• Transmitting
MEASUREMENT
UNIT
Rear Connect
: High Panel power meter to the
antenna connector.
Rear Connect
: Low Panel deviation meter to
the antenna con-
nector through an
attenuator.
: 1 kHz
: 70 mV
: OFF
: 20 kHz
: OFF
: (P–P)/2
5 - 3
VALUE
LOCATION
an RF 25 W
an FM ±4.3 kHz
R172
Frequency deviation
adjustment
R84
Output power
adjustment
ADJUSTMENT
POINT
UNIT ADJUST
MAIN R84
MAIN R172
AC millivoltmeter
2–200 mV
+
Audio generator
–
300 Hz to 3 kHz
J7
[PTT]
1
8