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Note
Note
Third Converter
Adjustment
16. Second IF Amplifier and Third Converter Adjustment
Place the Markers as accurately as possible within the cursor markers
for maximum frequency accuracy.
18. On the synthesized sweeper, press @G-X-n). M3 - M4 should read
between 7 and 14 MHz.
19. On the synthesized sweeper, press [MKR] OFF and @iW] OFF.
20. Set the synthesized sweeper FREQUENCY MARKERS (M1) to 251.4
MHz and IIv12) to 351.4 MHz.
21. Set the Scalar Network Analyzer (ml to 10 dB and set IREF)
(REF LEVEL) to + 14 dB. Set the REF POSN to one division down
from the top.
22. Adjust A19C12 for minimum amplitude response at 258.4 MHz.
Refer to Figure 3-64 for the location of the bandpass adjustments.
Refer to Figure 3-66 for the typical response when the bandpass
filter is properly adjusted.
2 8 0 MHz,
Figure 3-66. Minimum Image Response at 258.4 MHz
23. Repeat the adjustments in steps 13 and 22 to assure that the
at 258.4 MHz is minimized.
Remember to use the appropriate set up for steps 13 and 20.
Disconnect the cables from A19Jl and A19J2 and reconnect the
24.
instrument cables.
Disconnect cable 83 (gray/orange) from A20J3 and connect A20J3
25.
to the input of HP 8566A/B Spectrum Analyzer, using a BNC to
SMB test cable.
Press
on the HP 8566A/B Spectrum Analyzer, then
26.
)
PRESET
key in
[
CENTER FREQUENCY
MARKER
1 dB.
Adjust A20 AMPTD A20Ll for maximum signal level as indicated
27.
on spectrum analyzer display.
Disconnect spectrum analyzer and reconnect cable 83
28.
(gray/orange) to A20J3.
MHz,
280
)
[
FREQUENCY SPAN
+ 2 dBm, and
MHz. Set
2
)
[
ENTER
Adjustments 3-115
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