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Frequency Synthesizer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . HP3335A
Oscilloscope . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . HP 54501A
Crystal Filter Bypass Network (4 req&-ed) ......... See Figure 3-109
Test Cable: BNC to SMB snap-on . . . . . . . . . . . . . . . . . . . . HP 85680-60093
1.
Position the spectrum analyzer upright as shown in Figure 3-37
and remove the IF-Display Section top cover.
2.
Set the spectrum analyzer LINE switch to ON and press (2-22).
3.
Connect CAL OUTPUT signal to RF INPUT
4.
Key in IRECALL) @.
Adjust front panel FREQ ZERO control for maximum signal
5.
amplitude on the CRT display.
(
6.
Key in
CENTER FREQUENCY
10 kHz, (BW) 1 kHz, and press LIN pushbutton.
[
)
and adjust reference level, using step keys and
REFERENCE LEVEL
front-panel knob to place signal peak near top CRT graticule line.
7.
On A4A7 3 MHz Bandwidth Filter Assembly connect crystal filter
bypass networks between the two test points above C41 SYM, C32
SYM, C23 SYM, and Cl4 SYM. See Figure 3-38 for the location of
8.
Adjust A4A7C7 CTR for minimum amplitude of the displayed
signal peak. Adjust A4A7C6 SYM for best symmetry of the
displayed signal. Repeat adjustments to ensure that the displayed
signal is nulled and adjusted for best symmetry. See Figure 3-38
for location of adjustments.
You may find it helpful to widen and narrow the spectrum analyzer
frequency span to adjust the bandpass symmetry and centering for
each filter stage.
7. 3 MHz Bandwidth Filter Adjustments
)
[
100 MHz,
FREQUENCY
Press
Adjustments 3-77
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