On Mon, Mar 30, 2020 at 08:41 AM, Nbridgema wrote:
After installing ttrftech/NanoVNA version 0.7.1, F_min is again 50 KHz and F_ max is 2.7 GHz, although noisy > 1.5 GHz.
Confirm?
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Nbridgema,
I can confirm. edy555 opened the max frequency up to 2.7 GHz in the 0.7.0 release to to allow NanoVNA-H 3.4 version devices to experiment past 1.5 GHz. The hardware changes to the 3.4 version boards made operation to 1.8 GHz pretty good, and from 1.8-2.0 fair to poor. Past 2.0 GHz measurements are not reliable.
I expect similar performance on the NanoVNA-H4 as its hardware improvements are at least as good as the version 3.4 boards.
edy555 also changed the lower operating frequency from 10 kHz back to 50 kHz in the 0.7.0 release. If enough people lobbied for a change back to 10 kHz, I don't see a technical reason for not doing so. I do know edy555 doesn't want the lower operating frequency to get too close to the IF frequency.
- Herb
