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HP 8672A odd problem.


 

Synthesizer lock on all frequencies but has about a 10 KHz FM signal on
most frequencies. Using a scope on the output pins of the Phase detector
chip shows the expected pulses but about a ten KHz amplitude modulation on
the pins. Powwersupply looks clean. Chip jhas been replaced. Anyone seen
this before?



73

Tom

WB3AKD

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