Deviation Adjustments - Icom IC-80AD Service Manual

5-9 DEVIATION ADJUSTMENTS

Select an adjustment item using [2] / [8], then set the adjustment value as specifi ed using [DIAL].
ADJUSTMENT
ADJUSTMENT
ITEM
FM DEVIATION
[FMV]
(Mod. Freq. =1 kHz)
[VHF (BAND LOW)]
[VHF (BAND HIGH)]
[UHF (BAND LOW)]
[UHF (BAND HIGH)]
(Mod. Freq. =300 Hz)
[VHF (BAND LOW)]
[VHF (BAND HIGH)]
[FMR]
[UHF (BAND LOW)]
[UHF (BAND HIGH)]
DV DEVIATION
(VCO MODULATION)
[VHF (BAND LOW)]
[VHF (BAND HIGH)]
[DVV]
[UHF (BAND LOW)]
[UHF (BAND HIGH)]
(REF. MODULATION)
[VHF (BAND LOW)]
[VHF (BAND HIGH)]
[DVR]
[UHF (BAND LOW)]
[UHF (BAND HIGH)]
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1 1) Set the power supply voltage to 7.4 V.
1) Connect a modulation analyzer to the antenna connector through
an attenuator, and set is as;
HPF
LPF
De-emphasis : OFF
Detector
2) Connect an audio generator to the JIG cable (See the page 5-1).
2 1) Set the audio generator as;
Frequency
Level
3
2) While transmitting, adjust the deviation using [DIAL], then push
4
[BAND] to store the adjustment value.
5
1 1) Set the audio generator as;
Frequency
Level
2
2) While transmitting, adjust the deviation using [DIAL], then push
3
[BAND] to store the adjustment value.
4
1 1) Set the power supply voltage to 7.4 V.
1) Connect a modulation analyzer to the antenna connector through
an attenuator, and set is as;
HPF
LPF
– De-emphasis : OFF
Detector
2) Connect an audio generator to the JIG cable (See the page 5-1),
and set it as;
Frequency
Level
2 • While transmitting, adjust the deviation using [DIAL], then push
[BAND] to store the adjustment value.
3
4
5
6
7
8
9
OPERATION
: OFF
: 20 kHz
: (P-P)/2
: 1 kHz
: 90 mVrms
: 300 Hz
: 90 mVrms
: OFF
: 20 kHz
: (P-P)/2
: 1 kHz
: 90 mVrms.
5 - 8
VALUE
–
4.1–4.3 kHz
3.5–3.6 kHz
3.7–3.8 kHz
–
1.1–1.3 kHz
Minimum
deviation