
16. YTO Loop Adjustments
13.
14.
15.
16.
17.
18.
19.
20.
REFERENCE LEVEL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
+5
dBm
LOG SCALE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 dB/DIV
Set the Spectrum Analyzer (DUT) LINE switch to ON, and key
in
@REQUENCY
SPAN] 0 Hz, (CENTER FREQUENCY] 5.6786
GHz.
This
tunes the Al lA3 YTO to approximately 6.00
GHz.
On the second spectrum analyzer, key in (SHIFT) TRACE A
@iiKiEE],
ISHIFT)
LGHz)
1,
[PEAK SEARCH) to position a marker on
the peak of the displayed 6.00
GHz
signal. Press
~PRESEL
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
GHz.
This tunes the
AllA
YTO to approximately 4.00
GHz.
On the second spectrum analyzer, key in [PEAK SEARCH) to position
a marker on the peak of the displayed 4.00
GHz
signal. Press
[PRESEL
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
dB/DIv)
2-dB,
TRACE
Ei
(CLEAR-WRITE],
TRACE B
(j-j,
k-1.
On the spectrum analyzer (DUT), key in SWEEP (SINGLE),
[SWEEP
TIME] 200 set,
(mj
SWEEP
(CONT)
t.
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
GHz,
(STOP
FREQUENCY) 5.8786
GHz,
IsAvE_)
4, SWEEP
C-1.
This
tunes the
AllA
YTO from approximately 2.20
GHz
to 6.20
GHz.
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,
(CF
STEP SIZE) 100 MHz, [CENTER FREQUENCY]. Using the DATA
knob and step keys, tune the
AllA
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
lsAVEl5
on the
SDectrum
AnaIszer
(DUT).
-
1
.
,
3.138
Adjustments
Commentaires sur ces manuels