16. YTO Loop Adjustments
13.
14.
15.
16.
17.
18.
19.
20.
REFERENCE LEVEL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
LOG SCALE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 dB/DIV
Set the Spectrum Analyzer (DUT) LINE switch to ON, and key
in
SPAN
]
0 Hz,
(
CENTER FREQUENCY
]
5.6786
This
tunes the Al
YTO to approximately 6.00
On the second spectrum analyzer, key in (SHIFT) TRACE A
[
PEAK SEARCH
)
to position a marker on
the peak of the displayed 6.00
signal. Press
PEAK
)
on the second spectrum analyzer, and wait for the preselector
peaking routine to complete.
On the Spectrum Analyzer (DUT), key in
(
CENTER FREQUENCY
)
3.6786
This tunes the
YTO to approximately 4.00
On the second spectrum analyzer, key in
[
PEAK SEARCH
)
to position
a marker on
the
peak of the displayed 4.00
signal. Press
PEAK
)
on the second spectrum analyzer and wait for the
preselector peaking routine to complete.
On the second spectrum analyzer. kes in LOG SCALE
ENTER
TRACE
TRACE B
On the spectrum analyzer (DUT), key in SWEEP (SINGLE),
TIME
]
200
SWEEP
A “HARMONIC
LOCK 1” message should appear on the CRT display of the
spectrum analyzer (DUT).
On the spectrum analyzer (DUT), key in
[
START FREQUENCY
_)
1.8786
FREQUENCY
)
5.8786
4, SWEEP
This
tunes the
YTO from approximately 2.20
to 6.20
Wait for
the
sweep to complete (200 seconds)
and
the SWEEP
LED to turn off.
On the Spectrum Analyzer (DUT), key in
[
FREQUENCY SPAN
]
0 Hz,
STEP SIZE
)
100 MHz,
[
CENTER FREQUENCY
].
Using the DATA
knob and step keys, tune the
YTO to position the TRACE
A signal at the lowest point on the TRACE B waveform on the
display of the second spectrum analyzer. See Figure 3-72. Key in
on the
Adjustments
