Re: NanoVNA selector switch issues?
At least in the source code version I have, it is defined as 200 system ticks - which, going by the comments in the code, should be about 20ms. That shouldn't create a problem in and of itself. --
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Rune Broberg
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#2114
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Re: NanoVNA selector switch issues?
Rob, I just had a look at the code - debounce is defined as 200mS which I think is the culprit. I think if someone could build the F/W with a debounce of 100mS (or 75mS?), that would solve the
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Larry Rothman
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#2113
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Re: nanoVNA Real Resistance Measurement Range
60 ps is about one cm so it seems some calibration problem
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Erik Kaashoek
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#2112
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Re: Case for NanoVNA
[email protected]> wrote: HP/Agilent have made a few instruments over the years that combine the functionality of several instruments into the one box. Your comment got me thinking about the
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Dr. David Kirkby from Kirkby Microwave Ltd <drkirkby@...>
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#2111
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Re: Case for NanoVNA
From: Merlin Fox Amazon's demand algorithm at play I guess! Even worse on ebay :( ======================= I decided to go for two of the bigger boxes (MAX002S) as I have more kit which can then be
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David J Taylor
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#2110
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Re: Case for NanoVNA
Amazon's demand algorithm at play I guess! Even worse on ebay :(
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Merlin Fox
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#2109
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Re: nanoVNA Real Resistance Measurement Range
Hi Tom I get my nanoVNA to day. In the coming week I will measure the empty cap against my HP85033C calibration kit a let you know. Kind regards Kurt -----Oprindelig meddelelse----- Fra:
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Kurt Poulsen
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#2108
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Re: TDR Python Script
Hi Salil, I'm missing the measurement units in your diagram.
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Wolfgang Kiefer
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#2107
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Re: TDR Python Script
Hi Salil, Tested your new script and it is working, I just modified a few things for my own preference. And I use 'ax1.set_xlabel' instead of 'plt.xlabel' to have xlabel displayed. neb
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neb
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#2106
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Edited
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Re: nanoVNA Real Resistance Measurement Range
Hi Erik, Wow - great analysis! Your conclusion pinpointed the OPEN test deviation precisely! When I did the initial calibration I had not yet decided to document the testing. Then after deciding to
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Tom VA7TA
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#2105
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Re: New FreeRTOS-based nanoVNA 4.3" 800x480 LCD on Aliexpress
Unfortunately, I've since trashed all the related "stuff" and will not trust my memory ... However, I thought Hugen had set up a contact to deal with us english only speaking folks ... regretfully,
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jim <ab7vf@...>
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#2104
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Re: NanoVNA selector switch issues?
Hi Larry, et. al., You were right.? It happens in ui.c (static int Btn_check(void)) starting on line 121.? So it looks to me like you have the problem figured out.? The jog switch was something
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Rob Frohne (KL7NA)
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#2103
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Re: NanoVNA selector switch issues?
Thanks Larry, for responding!? It felt the same to me.? I'll have to dig into the source code and see what is happening.? I kind of wanted to know if others were experiencing the same thing before
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Rob Frohne (KL7NA)
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#2102
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Re: What about fittng N conectors like this?
That does make perfect sense. Thank you for the clarification. Don
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Don
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#2101
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Re: Battery won't keep charge after a few days of non-use
Paul, have a look at post 957 for more info on this issue.
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Larry Rothman
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#2100
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Re: Battery won't keep charge after a few days of non-use
thank you for that info, my old eyes aren't up to the task, so I'll live with it I guess
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Paul Raymond <paulandlenora@...>
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#2099
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Re: Battery won't keep charge after a few days of non-use
There is a quality issue with the caps that were installed around the charge,inverter IC chip that causes the chip to not function the way hugen had designed. Another forum member looked at the spec
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Larry Rothman
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#2098
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Re: NanoVNA selector switch issues?
I think the problem arises because the switch is software polled and not interrupt driven. I think most of the devices exhibit this. I have a black and a white unit and they both have this issue. One
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Larry Rothman
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#2097
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Battery won't keep charge after a few days of non-use
Anyone had this happen? My battery will charge ok via usb, but when inactive for a few days it will not boot unless plugged in to usb I measured the voltage when this happens and it's about 3.4V .
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Paul Raymond
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#2096
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Re: nanoVNA as sensitivity tester
Not really - or at least quite poorly. I don¡¯t know if it supports a span of zero, so can act as a signal generator, but I suspect that it does. The output power is unlikely to be well known or
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Dr. David Kirkby from Kirkby Microwave Ltd <drkirkby@...>
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#2095
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