From: DMR
RFpro, Firmware 10KHz-1500MHz.
By default, when turned on, 50KHz-900MHz.
Expand the boundaries in the frequency setting menu.
Added dfu menu item, now it is not necessary to close the jumper with tweezers. This assembly is based on source codes EDY555 & Hugen. At one's own risk. Work with other software is not guaranteed.
The display measures the reference capacitance 15nf, Port S11.
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Thanks for the note. I tried this firmware and indeed it does provide an indication of resonance up to 1.5 GHz. I note two oddities:
- when first switching on, the S11 scaling is 1 dB/division, and I'm unsure how to change this. Somehow, selecting the yellow trace format it went back to a more useful 10 dB/division, but on switching the device back on it returned to 1 dB. It may be that switching the trace between logmag and phase, and back again, restores the 10 dB scaling.
- using the nanovna-saver-v0.0.9, after changing the frequencies and running the sweep, the old sweep remained, but the frequencies had changed. Running the sweep a second time resulted in a new sweep matching the frequency scale. This could have just been finger trouble on my part.
On issue I do still see is that while the S11 plots are sensible with an antenna connected, with an open ch0 and ch1, the yellow S11 plot shows from -7 dB to -10 dB across the 0-900 MHz frequency range.
Cheers,
David
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David J Taylor