13. Sweep, DAC, and Main Coil Driver Adjustments
31.
32.
33.
34.
35.
36.
37.
38.
39.
40.
41.
ANALYZER
Figure 3-63.
YTO Main Coil Driver Adjustments Setup (Alternate
Key in
FREQUENCY
)
0 Hz (Frequency Span
readout should indicate 2
Adjust
6.15
adjustment to obtain two comb teeth
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
2.3
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
2
[
FREQUENCY
100 MHz,
30 KHz,
1,
2,
&
ENTER FREQUENCY
]
2
10
MHz,
10
3,
(C
ENTER FREQUENCY
)
(SAVE) 4.
Key in
1. With CAL OUTPUT connected to RF INPUT, at
least one comb tooth should be visible on display.
Adjust
6.15
to align nearest comb tooth with center
CRT graticule line.
Key in
2.
Adjust
2.3
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
