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IF System
Note 5 : Adjust the RF ATT of the spectrum analyzer so that the
spectrum analyzer does not distort.
Note 6 : When reading waveform on the screen of the spectrum
analyzer, read the center of the waveform noise.
4.4 Adjusting the IFv Output Level
1. Connect the devices as shown by the dotted in Connection
Diagram 3.
2. Set the devices as follows.
¶ Spectrum analyzer
¶ BE-3110
¶ Video SG
¶ TV modulator
Video SG
TV modulator
(TV IF MOD
115K)
45.75MHz
4.5 Adjusting the IFa Output Level
1. Connect the devices as shown by the dotted in Connection
Diagram 4.
2. Set the devices as shown below.
¶ Spectrum analyzer
¶ BE-3110
¶ Video SG
¶ TV modulator
Video SG
TV modulator
(TV IF MOD
115K)
41.25MHz
1 dB/div
f
: 45.75 MHz
0
Video Filter: off
Standby
Random
IFv: 45.75 MHz/50 dBmV,
unmodulated
IFv out
IFv in
Fig. 4-5 Connection Diagram 3
1 dB/div
f
: 41.25 MHz
0
Standby
Random
IFa: 41.25 MHz/45 dBmV,
unmodulated
IFa out
IFa in
Fig. 4-6 Connection Diagram 4
Note 7 : If the waveform on the screen of the spectrum analyzer is
difficult to read, adjust the luminance.
3. Adjust the spectrum analyzer so that the waveform of the IFv
signal peak level of the TV modulator can be seen clearly on the
screen of the spectrum analyzer. (Use this item as the reference
level.)
4. Connect the devices as shown by the solid line in Connection
Diagram 3.
5. Set this unit to standby.
6. Adjust control VR4 (RV4) of the RF ASSY so that the waveform
comes to the position set at step 3.
(Within 0 dB ± 0.2 dB)
Video in
BE-3110
IFv out
3. Adjust the spectrum analyzer so that the waveform of the IFa
signal peak level of the TV modulator can be seen clearly on the
screen of the spectrum analyzer. (Use this item as the reference
level.)
4. Connect the devices as shown by the solid line in Connection
Diagram 4.
5. Set this unit to standby.
6. Adjust control VR7 (RV7) of the RF ASSY so that the waveform
comes to the position set at step 3.
(Within 0 dB ± 0.2 dB)
Video in
BE-3110
IFa out
BE-3110
1 dB/div
f
: 45.75MHz
0
Video Filter: off
Spectrum
analyzer
1 dB/div
f
: 41.25MHz
0
Video Filter:off
Spectrum
analyzer
23
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