Icom IC-M220 Service Manual page 14

4-4 TRANSMIT ADJUSTMENTS (CONTINUED)
1) Select an adjustment item by pushing [↑]/[↓] on the PC keyboard.
2) Set or modify the adjustment value as specified by pushing [←]/[→], and then push [Enter] to store the value.
TRANSCEIVER'S
ADJUSTMENT
DEVIATION 1 • Operating channel: 16
-Verification- • Transmitting
(Transceiver)
(DSC) 2 • Operating channel: 70
• Transmitting
3
MODULATION
1 • Operating channel: 16
SENSITIVITY • Transmitting
-Verification-
TX SIGNAL-TO- 1 • Operating channel: 16
NOISE RATIO
• Transmitting
-Verification-
CONDITION
• Connect the modulation analyzer to
the antenna connector through the
attenuator and set it to:
HPF:
LPF:
De-emphasis: OFF
Detector:
• Connect the audio generator and the
AC millivoltmeter to the FRONT MIC
JACK through the JIG cable, and set
it to:
Frequency:
Wave form:
Level:
• Set the
Level:
• Connect the modulation analyzer to
the antenna connector through the
attenuator and set it to:
HPF:
LPF:
De-emphasis: OFF
Detector:
• Connect the AC millivoltmeter to the
modulation analyzer.
• Connect the audio generator and the
AC millivoltmeter to the FRONT MIC
JACK, and set it to:
Frequency:
Wave form:
• Adjust the
so that the deviation on the
analyzer
• The audio output level of the
modulation analyzer at this time is the
reference level (0 dB).
• Turn off the output of the audio
generator and verify the difference
between the audio output level of the
modulation analyzer at that time and
the reference level.
OPERATION
OFF
20 kHz
(P–P)/2
1 kHz
Sine wave
280 mV rms
–
audio generator to:
28 mV rms
OFF
20 kHz
(P‒P)/2
1 kHz
Sine wave
audio generator output level
modulation
becomes ±3.0 kHz.
4-6
ADJUSTMENT
VALUE
ITEM
– ±3.9~±4.3 kHz
[DSC (1300Hz)] ±2.6 kHz ±10%
[DSC (2100Hz)] ±4.2 kHz ±10%
[MSENS (INT)]
±2.7~±3.3 kHz
– More than
40 dB