Hi David,
I have seen situations where the NanoVNA had not changed frequency after
being asked to do so in the about 500ms I've arbitrarily decided to give
it. In this case, it would repeat the data it had prior to changing
frequency, but still send the new frequencies (as some more time would have
passed)
I will try to put some handling of this problem in the next version, which
might just be increasing the delay a little.
--
Rune / 5Q5R
On Sat, 14 Sep 2019, 10:56 David J Taylor via Groups.Io, <gm8arv=
[email protected]> wrote:
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.
================================
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
--
SatSignal Software - Quality software for you
Web:
Email: david-taylor@...
Twitter: @gm8arv
