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DiSlord / NanoVNA-D

Firmware for NanoVNA, NanoVNA-H, NanoVNA-H4. Support SD Card, external Serial connection, fast measure, fast exchange vs CPU
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Lower Start Frequency? #66

Closed Moonman0922 closed 11 months ago

Moonman0922 commented 1 year ago

I was wondering if there was a way to further decrease the allowed starting frequency for sweeps. 800hz is worlds better than 50k for my purposes, but it would be nice to have the option to decrease that even further, maybe even to 1hz. I have no knowledge of what impacts that would have on accuracy, just wondering if it would be possible to do.

DiSlord commented 1 year ago

Limits in used generators SI5351 allow only 800Hz Output MS5351 allow 1.5k Also on low frequency VNA perfomance very poor, and need use it very carefully. Additional IF (12kHz) harmonics noise damage measured data