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10. Step Gain and 18.4 MHz Local Oscillator Adjustments
34.
35.
36.
37.
38.
40.
Key in LIN,
[AUTO) (resolution bandwidth), and
(
REFERENCE LEVEL
]
-19.9
Set step attenuators to 13
Press
MARKER
twice to establish a new reference.
Key in
(
REFERENCE LEVEL
]
-18.0
Set step attenuators to 11
Adjust
VR for MKR A level of
See Figure 3-49
for location of adjustment.
Remove all test equipment from the spectrum analyzer. Connect
CAL OUTPUT to RF INPUT.
Press
and
Set front-panel FREQ ZERO control to midrange.
Adjust
FREQ ZERO to peak signal trace on CRT. See
Figure 3-49 for location of adjustment.
S T E P G A I N
F R E Q
A D J
Z E R O C O A R S E
V R
Figure 3-49.
Location of
Gain Step, 18.4 MHz LO, and +
Adjustments
41. Key in
(
FREQUENCY SPAN
]
1
100 Hz, and
SEARCH] [a.
42. Adjust front-panel FREQ ZERO control fully clockwise. Press
SEARCH
].
Signal should move at least 60 Hz away from
center CRT graticule line.
43. Adjust front-panel FREQ ZERO control fully counterclockwise.
Press
(
PEAK SEARCH
).
Signal should move at least 60 Hz away from
center CRT graticule line.
44. If proper indications are not achieved, increase or decrease value
of
and repeat adjustment from step 33. Refer to
3-3 for range of values.
45. Press
and (RECALL)
46. Adjust front panel FREQ ZERO for maximum amplitude of the
displayed signal trace.
3-99 Adjustments