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12
. 600 MHz Reference Adjustment
Assembly Adjusted
A15 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 ......................................................... 8566A/B
Procedure
1. Press
to turn the spectrum analyzer off, disconnect the power
LINE
cord, and remove the spectrum analyzer cover. Fold down the A15
RF and A14 frequency control assemblies. Prop up the A14
frequency control assembly.
2. Disconnect W33, gray/brown coax cable, from A15J701.
3. Connect the signal at A15J701 to the input of the 8566A/B spectrum
analyzer.
4. Reconnect the power cord and press
analyzer on.
5. Set the center frequency of the 8566A/B to 600 MHz and set the
frequency span and resolution bandwidth of the 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
8566A/B display and set to 1 dB per division.
7. Adjust A15C750, VCXO Adjust, for maximum amplitude.
8. Adjust A15C751 Tripler Adjust, for maximum amplitude. The level,
after proper adjustment, should be between −3 and +4.8 dBm
(typically 0 to +1 dBm).
9. Reconnect W33 to A15J701.
Chapter 3
Manual Adjustment Procedures
13 . 600 MHz Reference Adjustment
to turn the spectrum
LINE
159
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