Icom IC-M402

5 - 3
5-4 RECEIVER ADJUSTMENTS
SENSITIVITY
SQUELCH
• Operating channel : ch16
• [SQUELCH] control:
Max. counterclockwise
• Connect an SSG to the antenna
connector and set as:
Frequency : 156.800 MHz
Level : 100 µV*
(–67 dBm)
Modulation : 1 kHz
Deviation : ±3.5 kHz
• Receiving
• Operating channel : ch16
• [SQUELCH] control:
Max. counterclockwise
• Connect an SSG to the antenna
connector and set as:
Frequency : 156.800 MHz
Level : 0.22 µV*
(–120 dBm)
Modulation : 1 kHz
Deviation : ±3.5 kHz
• Receiving
ADJUSTMENT
ADJUSTMENT ADJUSTMENT CONDITION
MEASUREMENT
VALUE
POINT
UNIT LOCATION UNIT ADJUST
1
1
MAIN
MAIN
Connect the distor-
tion meter to the
[EXT SP] jack with a
4 Ω load.
Connect a DC volt-
meter to the check
point CP2.
Less than 0.32 µV
1.0 V MAIN
Verify
R16,
*This output level of a standard signal generator (SSG) is indicated as SSG’s open circuit.
5-3 TRANSMITTER ADJUSTMENTS
OUTPUT
POWER
FREQUENCY
DEVIATION
ADJUSTMENT
ADJUSTMENT ADJUSTMENT CONDITION
MEASUREMENT
VALUE
POINT
UNIT LOCATION UNIT ADJUST
1
1
• Operating channel : ch16
• Output power : High
• Transmitting
• Operating channel : ch16
• Output power : Low
• Connect an audio generator to J4
(pin 3) on the MAIN unit with an
AC millivoltmeter and set as:
Frequency : 1 kHz
Level : 45 mV
• Set an FM deviation meter as:
HPF : OFF
LPF : 20 kHz
De-emphasis : OFF
Detector : (P–P)/2
• Transmitting
Rear
Panel
Rear
Panel
Connect an RF
power meter to the
antenna connector.
Connect an FM
deviation meter to
the antenna con-
nector through an
attenuator.
26 W
±4.3 kHz
MAIN
MAIN
R71
R138