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18. 600 MHz Reference Adjustment
Assembly
Adjusted
Al5 RF assembly
Related
Performance
Test
There is no related performance test for this adjustment.
Description
The 100 MHz VCXO and the tripler are adjusted for a maximum signal level at 600 MHz.
A spectrum analyzer is used to monitor the amplitude of the 600 MHz signal while performing
these adjustments.
Equipment
Spectrum analyzer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . HP 8566A/B
Procedure
1. Press
LuNE)
to turn the spectrum analyzer off, disconnect the power cord, and remove the
spectrum analyzer cover. Fold down the Al5 RF and Al4 frequency control assemblies.
Prop up the Al4 frequency control assembly.
2. Disconnect W33, gray/brown coax cable, from A15J701.
3. Connect the signal at A15J701 to the input of the HP
8566A/B
spectrum analyzer.
4. Reconnect the power cord and press
m
to turn the spectrum analyzer on.
5. Set the center frequency of the HP
8566A/B
to 600 MHz and set the frequency span and
resolution bandwidth of the HP 8566A/B for the best display of the 600 MHz signal.
6. Set the peak of the 600 MHz signal near the top graticule line on the HP 8566A/B display
and set to 1 dB per division.
7. Adjust Al5 C750, VCXO Adjust, for maximum amplitude.
8. Adjust Al5 C751 Tripler Adjust, for maximum amplitude. The level, after proper
adjustment, should be between -3 and
t4.8
dBm
(typically 0 to
+l
dBm).
9. Reconnect W33 to A15J701.
2-66 Adjustment Procedures