560 Chapter10
Synthesizer Section
Frequency Span Accuracy Problems
5. Set the spectrum analyzer to the following settings:
Start frequency .......................................................... 10MHz
Stop frequency ........................................................... 2.9GHz
Sweep time ................................................................... 80ms
6. Monitor A14J15 pin 14 for a 0 V to −7.4 V ramp. Switches U317A,
U317B, and U317D should be open and U317C should be closed.
7. Change the spectrum analyzer SPAN to 365 MHz and check for a 0
to −936 mV ramp at A14J15 pin 14. Switches U317A, B, and C
should be open and U317D closed.
8. Change the spectrum analyzer SPAN to 36.5 MHz and check for a 0
to −93.6 mV ramp at A14J15 pin 14. Switches U317B, C, and D
should be open and U317A closed.
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