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Procedure 1.
Position instrument upright as shown in Figure 3-37 and remove
top cover.
Set LINE switch to ON and press
2.
Frequency Zero Check
3. Connect CAL OUTPUT signal to RF INPUT
Key in IRECALL) @.
4.
5. Adjust front panel FREQ ZERO control for maximum signal
amplitude on the CRT display.
Filter Center and Symmetry Adjustments
Key in
6.
front-panel knob to place signal peak near top CRT graticule line.
7. On the A4A7 assembly, connect crystal filter bypass networks
between the pins above C41 SYM, C32 SYM, C23 SYM, and Cl4
SYM.
8. Adjust A4A7C7 CTR for minimum amplitude signal peak. Adjust
ensure that the signal is nulled and adjusted for best symmetry.
See Figure 3-38 for location of adjustments.
Note
You may find it helpful to widen and narrow the frequency span of
the instrument to adjust the bandpass symmetry and centering for
each filter stage.
9. Remove crystal filter bypass network near Cl4 SYM.
7. 3 MHz Bandwidth Filter Adjustments
MHz,
20
)
FREQUENCY
and adjust reference level, using step keys and
]
LEVEL
3 MHz B a n d w i d t h F i l t e r
Figure 3-38.
Location of Center, Symmetry, and 10 Hz Amplitude
Adjustments
).
PRESET
10
Adjustments 3-73
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