16.
Loop Adjustments
41.
All YTO Loop Frequency:
MHz
On the synthesized sweeper, press
and key in the M/N Loop
Frequency from step 40.
42.
43.
Press
on the second spectrum analyzer. Connect the CAL
OUTPUT signal on the second spectrum analyzer to the RF INPUT
on the second spectrum analyzer, and press
8.
Adjust the AMPTD CAL control on the second spectrum analyzer
for a -10.00
displayed signal. Then, key in
[
FREQUENCY SPAN
)
on the second spectrum analyzer and wait for
the self-correction routine to complete. Key in
TRACE A
on the second spectrum analyzer.
44. Use a second BNC to SMB snap-on test cable to connect the RF
INPUT of
the
second spectrum analyzer to AllJ5 IF OUT.
45. Set the controls of the second spectrum analyzer as follows:
START FREQUENCY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . MHz
STOP FREQUENCY . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
MHz
REFERENCE LEVEL . . . . . . . . . . . . . . . . . . . . . . . . . . . + 10
LOG SCALE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 dB/DIV
RESOLUTION BW . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
46. The IF OUT fundamental and second harmonics should be visible
at approximately 30 MHz and 60 MHz on the display of the second
spectrum analyzer, as shown in Figure 3-75. Key in MARKER
30 MHz to position a marker at 30.03 MHz on the display
of the second spectrum analyzer.
Figure 3-75.
30 MHz YTO Loop Sampler Response at A 1155 IF OUT
47. On the Spectrum Analyzer (DUT), turn the DATA knob as
necessary to tune the IF OUT fundamental to 30.0 MHz 0.5
MHz, as indicated by the marker on the display of the second
spectrum analyzer.
Adjustments 3-143
