5 - 2
5-2 PLL ADJUSTMENTS
LOCK
VOLTAGE
REFERENCE
FREQUENCY
ADJUSTMENT
ADJUSTMENT
ADJUSTMENT CONDITION
MEASUREMENT
VALUE
POINT
UNIT
LOCATION
UNIT
ADJUST
1
2
1
• Operating channel : ch16
• Receiving
• Operating channel : ch16
• Output power
: Low
• Transmitting
• Operating channel : ch16
• Output power
: Low
• Connect an RF power meter or a
50
Ω
dummy load to the antenna
connector.
• Transmitting
MAIN
Rear
Panel
Connect a digital
multi-meter or oscil-
loscope to the
check point LV.
Loosely couple the
frequency counter
to the antenna con-
nector.
1.8 V
1.6 V
156.8000 MHz
MAIN
Verify
C257
C36
Reference frequency
adjustment
CP1
PLL lock voltage
check point
Summary of Contents for IC-M302
Page 1: ...SERVICE MANUAL VHF MARINE TRANSCEIVER M302 ...
Page 29: ... BOTTOM VIEW DS4 DS5 DS7 DS6 DS2 DS3 9 4 ...
Page 30: ...J 1 R 1 1 5 HVS VOL1 VOL2 GND HV J1 to the MAIN unit W1 9 3 VR BOARD TOP VIEW BOTTOM VIEW 9 5 ...
Page 31: ...J 1 R 1 1 3 SQLI SQLV GND J1 to the MAIN unit W1 9 4 SQL BOARD TOP VIEW BOTTOM VIEW 9 6 ...
Page 32: ...9 7 R1 R3 R2 S2 S3 S4 R4 9 5 HM 141 TOP VIEW ...
Page 33: ...9 8 BOTTOM VIEW C1 S1 ...
Page 40: ......
Page 41: ...1 1 32 Kamiminami Hirano ku Osaka 547 0003 Japan S 14011IZ C1 2003 Icom Inc ...