Adjustment Procedures
2715 Spectrum Analyzer Service Manual 5-45
Adjust High Pass Filter.Adjust C21, C22, C23, and C24 as follows:
1. Adjust C21, C22, C23 and C24 on the video demod board so the response of
the High Pass filter closely resemblesthe curve shown in Figure 5--17 and
conforms to the limits indicated in thefigure.
NOTE. C21 and C22 primarily tune the notch seen at about 93 MHz; C23 and
C24 primarily affect the areaaround the knee seen near 103 MHz. However,
there is appreciableinteraction between the adjustments.
10dB/DIV
5 MHz/DIV
Atleast 40 dB insertion
lossat 97.0 MHz
Nomore than 14 dB
insertionloss in passband
103.5thru 115 MHz
Atleast 11 dB insertion loss
inrange 100 thru 115 MHz
Figure 5- 17: HPF TuningCriteria (at TP110M)
2. Disconnect the tracking generatoroutput cable from the Video Demod board.