Chapter 3 3-51
Adjustments and Correction Constants
Fractional-N Spur Avoidance and FM Sideband Adjustment
5. Adjust the 100 kHz (R77) for a null (minimum amplitude) on the spectrum analyzer.
The minimum signal may, or may not, drop down into the noise floor.
Figure 3-23 Location of API and 100 kHz Adjustments
6. On the spectrum analyzer, set the center frequency for 676.051105 MHz.
7. On the analyzer, press .
8. Adjust the API1 (R35) for a null (minimum amplitude) on the spectrum analyzer.
9. On the spectrum analyzer, set the center frequency for 676.007515 MHz.
10.On the analyzer, press .
11.Adjust the API2 (R43) for a null (minimum amplitude) on the spectrum analyzer.
12.On the spectrum analyzer, set the center frequency for 676.003450 MHz.
13.On the analyzer, press .
14.Adjust the API3 (R45) for a null (minimum amplitude) on the spectrum analyzer.
15.On the spectrum analyzer, set the center frequency for 676.003045 MHz.
16.On the analyzer, press .
17.Adjust the API4 (R47) for a null (minimum amplitude) on the spectrum analyzer.
In Case of Difficulty
18.If this adjustment cannot be performed satisfactorily, repeat the entire procedure, or
replace the A13 board assembly.
Sweep Setup
676.048105 M/µ
Sweep Setup
676.004515 M/µ
Sweep Setup
676.00045 M/µ
Sweep Setup
676.000045 M/µ
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