Transmitter Adjustments; Receiver Adjustments - Icom IC-M401EURO Service Manual

5-3 TRANSMITTER ADJUSTMENTS

ADJUSTMENT ADJUSTMENT CONDITION
OUTPUT 1 • Operating channel : ch16
POWER • Output power
• Transmitting
FREQUENCY 1 • Operating channel : ch16
DEVIATION • Output power
• Connect an audio generator to J4
(pin 3) on the MAIN unit with an
AC millivoltmeter and set as:
Frequency
Level
• Set an FM deviation meter as:
HPF
LPF
De-emphasis
Detector
• Transmitting

5-4 RECEIVER ADJUSTMENTS

ADJUSTMENT ADJUSTMENT CONDITION
SENSITIVITY 1 • Operating channel : ch16
• [SQUELCH] control:
• Connect an SSG to the antenna
connector and set as:
Frequency
Level
Modulation
Deviation
• Receiving
SQUELCH 1 • Operating channel : ch16
• [SQUELCH] control:
• Connect an SSG to the antenna
connector and set as:
Frequency
Level
Modulation
Deviation
• Receiving
*This output level of a standard signal generator (SSG) is indicated as SSG's open circuit.
UNIT
Rear
: High Panel
Rear
: Low Panel
: 1 kHz
: 20 mV
: OFF
: 20 kHz
: OFF
: (P–P)/2
UNIT
MAIN
Max. counterclockwise
: 156.800 MHz
: 3.2 µV*
(–97 dBm)
: 1 kHz
: ±3.5 kHz
MAIN
Max. counterclockwise
: 156.800 MHz
: 0.71 µV*
(–110 dBm)
: 1 kHz
: ±3.5 kHz
MEASUREMENT
LOCATION
Connect an RF
power meter to the
antenna connector.
Connect an FM
deviation meter to
the antenna con-
nector through an
attenuator.
MEASUREMENT
LOCATION
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.
5 - 3
ADJUSTMENT
POINT
VALUE
UNIT
22.5 W MAIN
±4.3 kHz MAIN
ADJUSTMENT
POINT
VALUE
UNIT
Less than 0.56 µV
0.8 V MAIN
ADJUST
R71
R138
ADJUST
Verify
R16,