It is the SYMPTOM - probably a problem in the phase detector or anything between the pD and the oscillator drive.
You need to verify the PD inputs and output.
Cheers!
Bruce
Quoting Tony <tonycox01@...>:
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Hi Goran,
The tuning voltage to the HF oscillator seems to be constant at -12V at 500MHz and does not vary until the set frequency drops down to 750MHz where it flips to +13V and stays there. Nothing in between. I guess this is my problem?
BW
tony
