Sure, I'll try that. I'll try an xtal in its shunt mode, so just a S11 measurement. Then in series mode in which case I should pick up both a S11 and S21 set of values. I assume you measured the xtal in its series mode.
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Sent: Wednesday, July 10, 2019 10:34 PM
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[email protected]Subject: Re: [nanovna-users] Narrow band filters and LO phase noise/jitter?
Now try a single crystal, closely scanned/calibrated, near resonant frequency point.
It won't be matched to 50 ohms but will still give you a narrow curve.
I tried a crystal at 27 MHz and it looked good, without all the noise of your 500 Hz filter.
Next, I plotted Zmag and Zang too from S11 values and it didn't look too bad either.
But don't count on correct impedance values when you are too far from 50 ohm sweet spot.
