Icom IC-M220

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