
7. 3 MHz Bandwidth Filter Adjustments
10
Hz
Amplitude
37. Connect CAL OUTPUT to RF INPUT. Key in
(-1,
C-1
9,
Adjustments
@E--ET)
10 Hz.
38. Adjust the spectrum analyzer front panel FREQ ZERO control for
maximum signal amplitude on the CRT display.
39. Key in
[RESBW)
1
kHz
and DISPLAY LINE
C-1.
Using the
DATA knob, place the display line at the signal trace.
40. Key in
(REs]
10 Hz.
41. Adjust the spectrum analyzer front panel FREQ ZERO control for
maximum signal amplitude on the CRT display.
42. Adjust
A4A7R30
10 Hz AMPTD and
A4A7R41
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.
Note
Factory-select component
A4A7R60
sets the overall gain of the
A4A7
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
A4A7
3 MHz Bandwidth
Filter or the
A4A5
Step Gain Assembly is replaced or repaired.
Note
The remaining adjustments and selection of factory-select components
for the
A4A7
3 MHz Bandwidth Filter are performed in Adjustment
Procedure 9, “3-dB Bandwidth Adjustments.
n
This procedure should
be performed if the
A4A7
3 MHz Bandwidth Filter is replaced or
repaired.
Adjustments 3.91
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