7. 3 MHz Bandwidth Filter Adjustments
37. Connect CAL OUTPUT to RF INPUT. Key in
9,
10 Hz.
38. Adjust the spectrum analyzer front panel FREQ ZERO control for
maximum signal amplitude on the CRT display.
39. Key in
1
and DISPLAY LINE
Using the
DATA knob, place the display line at the signal trace.
40.
Key in
10 Hz.
41. Adjust the spectrum analyzer front panel FREQ ZERO control for
maximum signal amplitude on the CRT display.
42. Adjust
10 Hz AMPTD and
10 Hz AMPTD equal
amounts to set the signal level the same as the reference level set
in step 39. See Figure 3-38 for location of 10 Hz AMPTD adjusts.
43. Repeat steps 37 through 42 until no further adjustment is
required.
Factory-select component
sets the overall gain of the
3 MHz Bandwidth Filter, and is selected as required in Adjustment
Procedure 10, “Step Gain and 18.4 MHz Local Oscillator Adjustments.”
This procedure should be performed if the
3 MHz Bandwidth
Filter or the
Step Gain Assembly is replaced or repaired.
The remaining adjustments and selection of factory-select components
for the
3 MHz Bandwidth Filter are performed in Adjustment
Procedure 9, “3-dB Bandwidth Adjustments. This procedure should
be performed if the
3 MHz Bandwidth Filter is replaced or
repaired.
Adjustments
