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2 1. Frequency Response Adjustments
22. On the synthesized sweeper, press
the
ENTRY knob as necessary for a power meter indication of
-15.00 dBm *2.00 dB at 100 MHz.
23. On the power meter, press
24. On the synthesized sweeper, press
ENTRY knob for a power meter indication of -10.00 dBm f0.03
25. On the synthesized sweeper, press [mj LEVELING and adjust
the ENTRY knob (REF in dBV with ATN: 0 dB) for a power
meter indication of -10.00 dBm ho.03 dB at 100 MHz.
Do not vary the synthesized sweeper POWER LEVEL setting
(internal leveling) or METER REF and METER ATN settings (external
power meter leveling) for the remaining steps in this section of the
adjustment procedure. The frequency response adjustments are
referenced to the -10.00 dBm power level at 100 MHz.
26. Press [2--22) on the spectrum analyzer. Set the RF Section
front-panel AMPTD CAL control to
adjustment range.
Do not vary
the
spectrum analyzer front-panel AMPTD CAL control
setting for the remaining steps in this adjustment procedure.
27. Set (Band A Lower Segment) A6AllR48 Al and (Band A Upper
Segment) A6AllR66 A2 each to the approximate center of its
adjustment range.
Then, adjust A6AllR84 GAIN fully clockwise for maximum
RF gain. See Figure 3-90 for the locations of A6AllR48 Al,
28. On the spectrum analyzer, key in
-4 dBm and then press the @) and @'J keys as necessary to
position the peak of the displayed 100 MHz signal within one
division of the top graticule line. Key in MARKER
MARKER [nl on the spectrum analyzer to position two markers
on
the peak of the displayed 100 MHz signal.
29. Readjust A6AllR84 GAIN counterclockwise to decrease the RF
gain 5.00 dB *0.02 dB, as indicated by the MARKER A indication
on the spectrum analyzer display.
30. On
the
spectrum analyzer, key in (RECALL) 8.
31. Adjust 17-turn potentiometer (Band A Step Gain) A6AlOR21
GA to adjust the amplitude of the displayed 100 MHz signal to
to increase the signal level, and clockwise to decrease the signal
level. If A6AlOR21 GA does not have sufficient range, adjust the
amplitude of the 100 MHz displayed signal as close as possible to
-10.00 dBm.
]
and adjust
LEVEL
(
)
(turning it on).
RANGE HOLD
(
)
and adjust the
POWER LEVEL
the
approximate center of its
[
8,
REFERENCE LEVEL
)
(
),
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