Chapter 2 51
Making Adjustments
5. Crystal and LC Bandwidth Filter
5. Press AMPLITUDE, then use the knob to place the signal at the sixth
graticule line from the bottom.
6. Press BW, 30, kHz on the analyzer.
CAUTION Shorting the crystal test points to ground may permanently damage the
bandwidth board assembly. If you make your own shorts, it is advisable
to insulate the bare wires and connectors.
7. Connect the crystal shorts (through the access holes on the assembly
cover) across the following pairs of test points.
A13TP1 and A13TP2
A11TP1 and A11TP2
A11TP4 and A11TP5
8. Adjust A13C54 CTR for minimum signal amplitude. Then adjust
A13C38 SYM and A13C54 CTR for a centered and symmetrical
bandpass response as shown in Figure 2-9.
9. Remove the crystal short from A13TP1 and A13TP2 and connect it
across A13TP4 and A13TP5.
10.Adjust A13C25 CTR for minimum signal amplitude. Then adjust
A13C15 SYM and A13C25 CTR for a centered and symmetrical
bandpass response.
11.Remove the crystal short from A11TP4 and A11TP5. Connect the
short across A13TP1 and A13TP2.
12.Adjust A11C54 CTR for minimum signal amplitude. Then adjust
A11C38 SYM and A11C54 CTR for a centered and symmetrical
bandpass response.
13.Remove the crystal short from A11TP1 and A11TP2. Connect the
short across A11TP4 and A11TP5.
14.Adjust A11C25 CTR for minimum signal amplitude. Then adjust
A11C15 SYM and A11C25 CTR for a centered and symmetrical
bandpass response.
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