[time-nuts] notch filter for close in phase noise measurement
cfharris at erols.com
Sun Oct 2 16:49:50 EDT 2016
That is a most interesting suggestion.
Suppose the filter crystal was pulled to the DUT frequency, and due
to the inertia of its very high Q, was able to show you the phase noise
variations of the DUT better than one might expect?
Bob Camp wrote:
>.....One thing you may be seeing is the crystal shift frequency as it is tuned to “accept” power from the source.
> With milliwatts of power flying around, that would not be unusual.
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