
13. Sweep, DAC, and Main Coil Driver Adjustments
31.
32.
33.
34.
35.
36.
37.
38.
39.
40.
41.
SPECTRLU ANALYZER
Figure 3-63.
YTO Main Coil Driver Adjustments Setup (Alternate
Piocedure)
Key in
@Z?iTKJ,
CCENTER
FREQUENCY) 0 Hz (Frequency Span
readout should indicate 2
GHz).
Adjust
A20R25
6.15
GHz
adjustment to obtain two comb teeth
(f100
MHz harmonics of CAL OUTPUT signal) per division on
display. Comb teeth should be evenly spaced but not necessarily
aligned with CRT graticule lines (counterclockwise rotation of
adjustment increases spacing between comb teeth).
Adjust
A20R34
2.3
GHz
adjustment to align LO feedthrough signal
(0 Hz) with center CRT graticule line. It might be necessary
to disconnect RF INPUT to locate LO feedthrough signal
(counterclockwise rotation of adjustment moves signal to right).
Repeat steps 32 through 33 until comb teeth are spaced two per
division and aligned with CRT graticule lines (every other comb
tooth will align with a graticule line).
Key in (CENTER
FREQUENCYI)
2
GHz,
[FREQUENCY
SPAN)
100 MHz,
(RES)
30 KHz,
(SAVE_]
1,
[CENTER]
(SHIFT)
(WJ
.9
GHz,
m
2, &ENTER FREQUENCY] 2
GHz,
~EQUENCY
SPANS
10
MHz,
&iEEiiij
10
kHz,
ISAVE_)
3, (CENTER FREQUENCY)
CsHlFTl
[=J
.9 GHz, (SAVE) 4.
Key in
[RECALL]
1. With CAL OUTPUT connected to RF INPUT, at
least one comb tooth should be visible on display.
Adjust
A20R25
6.15
GHz
to align nearest comb tooth with center
CRT graticule line.
Key in
[j?EZXQ
2.
Adjust
A20R34
2.3
GHz
to align nearest comb tooth with center
CRT graticule line.
Repeat steps 36 through 39 until no further adjustments are
necessary.
Key in (RECALL) 3.
3-122 Adjustments
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