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BE-3110
4.6 Adjusting the Scramble Timing
1. Connect the devices as shown in Connection Diagram 5.
2. Set the devices as shown below.
¶ Video SG
¶ TV modulator
¶ Oscilloscope
¶ CATV terminal
¶ Variable resistance attenuator
3. Set this unit to the adjustment (Digitally SW:F) mode.
Video in
All black signal
Video
SG
H-sync
TRG.
Video out
Oscilloscope
24
All black signals
IFv: 45.75 MHz/50 dBmV
IFa: 41.25 MHz/45 dBmV
H: 1 µs/div
V: 0.1 V/div
US-7ch/10 dBmV input
Adjust the output level to 10 dBmV
2
2µs
Fig. 4-7 Timing Waveform
Video out
IFa in
IFa out
BE-3110
IFv in
IFv out
RF in
TV
demodulator
Fig. 4-8 Connection Diagram 5
4. Set to the group 0 mode 1 using the key switch on the front
panel of this unit, and adjust so that the return waveform of the
video signal in the timing waveform (Fig. 4-7) shown on the
oscilloscope screen comes to point 1.
5. Set to the group 0 mode 2 using the key switch on the front
panel of this unit, and adjust so that the compressed waveform
of the video signal in the timing waveform shown on the
oscilloscope screen comes to point 2.
Note 8 : Steps 4, and 5 can be performed in any order.
H:1µs/div
V:0.1V/div
1
1µs
Video in
115K
IFa out
TV modulator
IFa in
IFv out
TV
RF
IF
CONV.
IFv in
MOD
CW
generator
100.15MHz
38.9MHz
MIXER
Variable
resistance
RF out
attenuator
10dBmV
US-7ch
CATV
terminal
US-3ch
VHF
AMP
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