BE-3110
IF System
Note 5 :Adjust the RF ATT of the spectrum analyzer so thaNote 7 :t theIf the waveform on the screen of the spectrum analyzer is
spectrum analyzer does not distort.difficult to read, adjust the luminance.
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 Connection3. Adjust the spectrum analyzer so that the waveform of the IFv
Diagram 3.signal peak level of the TV modulator can be seen clearly on the
2. Set the devices as follows.screen of the spectrum analyzer. (Use this item as the reference
? Spectrum analyzer1 dB/divlevel.)
f0 : 45.75 MHz4. Connect the devices as shown by the solid line in Connection
Video Filter: offDiagram 3.
? BE-3110Standby5. Set this unit to standby.
? Video SGRandom6. Adjust control VR4 (RV4) of the RF ASSY so that the waveform
? TV modulatorIFv: 45.75 MHz/50 dBmV,comes to the position set at step 3.
unmodulated(Within 0 dB ? 0.2 dB)
Video SG
1 dB/div
f0: 45.75MHz
Video inVideo Filter: off
TV modulatorSpectrum
(TV IF MOD IFv outIFv inBE-3110IFv outanalyzer
115K)
45.75MHz
Fig. 4-5 Connection Diagram 3
4.5 Adjusting the IFa Output Level
1. Connect the devices as shown by the dotted in Connection3. Adjust the spectrum analyzer so that the waveform of the IFa
Diagram 4.signal peak level of the TV modulator can be seen clearly on the
2. Set the devices as shown below.screen of the spectrum analyzer. (Use this item as the reference
? Spectrum analyzer1 dB/divlevel.)
f0 : 41.25 MHz4. Connect the devices as shown by the solid line in Connection
? BE-3110StandbyDiagram 4.
? Video SGRandom5. Set this unit to standby.
? TV modulatorIFa: 41.25 MHz/45 dBmV,6. Adjust control VR7 (RV7) of the RF ASSY so that the waveform
unmodulatedcomes to the position set at step 3.
(Within 0 dB ? 0.2 dB)
Video SG1 dB/div
f0 : 41.25MHz
Video inVideo Filter:off
TV modulatorSpectrum
(TV IF MOD IFa outIFa inBE-3110IFa outanalyzer
115K)
41.25MHz
Fig. 4-6 Connection Diagram 4
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