3-40
CCU-700A
CCU-700AP
A
B
A
B
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/
BVP rear panel
→
“ENG”
Test point
:
TP4 (GND: E1)/AT-88 board
Adjusting point
:
1
RV61 (INCOM 2 DEV)/AT-88
board
Specification
:
A = B = 6.0
±
0.4 kHz
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
1
RV61 (INCOM 2 DEV) on the AT-88 board
so that the A and B are 6.0
±
0.4 kHz.
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/
BVP rear panel
→
“ENG”
Test point
:
TP3 (GND: E1)/AT-88 board
Adjusting point
:
1
RV41 (INCOM 1 DEV)/AT-88
board
Specification
:
A = B = 6.0
±
0.4 kHz
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
1
RV41 (INCOM 1 DEV) on the AT-88 board
so that the A and B are 6.0
±
0.4 kHz.
3-8. TRIAX Interface System Adjustment
CENT FREQ : 3.9MHz
FREQ SPAN : 20MHz
Image of waveform
CENT FREQ : 3.9MHz
FREQ SPAN : 20MHz
Image of waveform