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3-8. TRIAX Interface System Adjustment
3-8-2. INCOM 1 Deviation Adjustment
Rank:
C
Equipment:
Spectrum analyzer, Oscilloscope,
Audio generator
To be extended:
AT-88 board
Preparation
• INCOM 1 (PROD/ENG) switch/
Test point:
TP3 (GND: E1)/AT-88 board
Adjusting point:
1RV41 (INCOM 1 DEV)/AT-88
board
A = B = 6.0 ±0.4 kHz
Specification:
Adjustment Procedure
1. (For 4W intercom system)
Feed the 400Hz sine-wave to pin A71 (X), pin B71
(Y) and pin C71 (GND)/extension board (AT-88).
...Fig-2 (Refer to 3-1-4. Audio connection.)
(For 2W intercom system)
Feed the 400Hz sine-wave to pin A71 (X), pin C71
(GND)/extension board.
...Fig-1 (Refer to 3-1-4. Audio connection.)
2. Adjust the output of audio generator so that the level at
TP46 (GND: E1) on the AT-88 board is 200 mV p-p.
3. Connect the probe of the spectrum analyzer to TP3
(GND: E1) on the AT-88 board.
Adjust 1RV41 (INCOM 1 DEV) on the AT-88 board
so that the A and B are 6.0 ±0.4 kHz.
A
CENT FREQ : 3.9MHz
FREQ SPAN : 20MHz
3-40
BVP rear panel → "ENG"
B
Image of waveform
3-8-3. INCOM 2 Deviation Adjustment
Rank:
C
Equipment:
Spectrum analyzer, Oscilloscope,
Audio generator
To be extended:
AT-88 board
Preparation
• INCOM 2 (PROD/ENG) switch/
Test point:
TP4 (GND: E1)/AT-88 board
Adjusting point:
1RV61 (INCOM 2 DEV)/AT-88
board
A = B = 6.0 ±0.4 kHz
Specification:
Adjustment Procedure
1. (For 4W intercom system)
Feed the 400Hz sine-wave to pin C69 (X), pin D69
(Y) and pin A70 (GND)/extension board (AT-88).
...Fig-2 (Refer to 3-1-4. Audio connection.)
(For 2W intercom system)
Feed the 400Hz sine-wave to pin C69 (X), pin A70
(GND)/extension board (AT-88).
...Fig-1 (Refer to 3-1-4. Audio connection.)
2. Adjust the output of audio generator so that the level at
TP43 (GND: E10) on the AT-88 board is 200 mV p-p.
3. Connect the probe of the spectrum analyzer to TP4
(GND: E1) on the AT-88 board.
Adjust 1RV61 (INCOM 2 DEV) on the AT-88 board
so that the A and B are 6.0 ±0.4 kHz.
A
CENT FREQ : 3.9MHz
FREQ SPAN : 20MHz
BVP rear panel → "ENG"
B
Image of waveform
CCU-700A
CCU-700AP
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