Icom IC-M401E

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-E
Rear
Panel
Connect a digital
multi-meter or oscil-
loscope to the
check point CP1.
Loosely couple the
frequency counter
to the antenna con-
nector.
1.8 V
1.6 V
156.8000 MHz MAIN
Verify
C12
C12
Reference frequency
adjustment
CP1
PLL lock voltage
check point