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Do any NanoVNA firmware or software versions support display of the Smith chart Admittance scale ?
If not, is anyone prepared to add it ?
It's useful to have for antenna matching problems.
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Regards,
Martin - G8JNJ
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It doesn¡¯t seem to be on the nanoVNA-H4 with the DiSlord firmware V1.0.39. On Sun, Nov 15, 2020 at 7:41 AM Martin via groups.io <martin_ehrenfried= [email protected]> wrote: Do any NanoVNA firmware or software versions support display of the Smith
chart Admittance scale ?
If not, is anyone prepared to add it ?
It's useful to have for antenna matching problems.
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Regards,
Martin - G8JNJ
-- 73, Tripp Sanders K5TRP
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Can't you convert from series Z to parallel Z in your head?
Alan
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Arrrrghh Nooooo! That¡¯s not normal ???? Regds Ross Ross Filippi VK2ATA From: alan victor<mailto:avictor73@...> Sent: Monday, 16 November 2020 11:48 AM To: [email protected]<mailto: [email protected]> Subject: Re: [nanovna-users] Smith chart - admittance scale ? Can't you convert from series Z to parallel Z in your head? Alan
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Hi Ross!
Thanks for the FUN! It really is not that bad.
However, I think what Martin would like is the ability to flip the standard chart off, turn on its admittance form and then the ability to toggle both views on or create an immittance view. Of course, in 2 colors like red and green. Since the LCD has the ability of color, that would be nice. I have a 2 foot long by 1and1/2 foot wide version of such a chart in my office. It has a plastic clear mylar sheet over it and a grease pencil attached. Back in the day, pre CAD, that's the way it was done.
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On Mon, Nov 16, 2020 at 04:41 AM, alan victor wrote:
I think what Martin would like is the ability to flip the standard chart off,
turn on its admittance form and then the ability to toggle both views on or
create an immittance view.
Hi Alan, Yes that was my requirement. I was working my way though one of Owen Duffy's recent blog posts I agree with his comment that having the Admittance scale would be handy, as I already have enough problems with maths, and any extra help in this respect is definitely of benefit to me. It is possible to do the mental (calculator or spreadsheet) maths, but sometimes it just helps if you can do it graphically, which is one of the great advantages of the Smith chart as you can form a good 'visual' image of what's going on, which helps you to understand the manipulations you are trying to perform. Which in turn is very handy as a teaching and self-training aid. -- Regards, Martin - G8JNJ
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I've suggested this to the developper of nanoSAVER about one year ago. It became an item on his? to do list, but was never done. Other priorities. New developpers never picked this up but gave priority to other issues. I'm not complaining here.
Sure would like to have the admittance circles in nanoSAVER. Not to calculate from series to parallel but as a help for tuning networks.
It just needs some extra grafics, or am I thinking too simple?
73
Arie PA3A
Op 15-11-2020 om 14:41 schreef Martin via groups.io:
toggle quoted message
Show quoted text
Do any NanoVNA firmware or software versions support display of the Smith chart Admittance scale ?
If not, is anyone prepared to add it ?
It's useful to have for antenna matching problems.
-
Regards,
Martin - G8JNJ
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On Mon, Nov 16, 2020 at 11:20 AM, Arie Kleingeld PA3A wrote:
Other priorities. New developpers never picked this up but gave priority to
other issues. I'm not complaining here.
Hi Arie, Agreed. I think I've missed the window of opportunity to ask for stuff like this, as the firmware and software is now relatively stable and any updates and enhancements tend to be 'few and far between', as the developers have moved onto 'newer and shinier' things, as we all have a tendency to do once the initial novelty has worn off.......................... Still it's always worth asking. Because if you don't ask, you don't get :-) -- Regards, Martin - G8JNJ
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Martin,
the NanoVNA-App software by One Of Eleven supports display of the
admittance and reactance Smith Charts side by side.
Is that what you are asking?
73
Martin 9A2JK
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Hi Arie,
you know that the original creator of NanoVNA-Saver (Rune 5Q5R) will no longer be working on this project from the beginning of this year. Unfortunately, I can also imagine that this was His "swan song." Anyone who has taken it over and will carry it on will probably be able to do it in their spare time as a hobby.
Indeed, there are and are improvements in this topic in other programming teams. Since their developments are ongoing and they are made for their own use, it is up to them to decide when and what to share. Anyone who listens knows what I'm talking about.
Please be patient and you can try this for yourself.
73, Gyula HA3HZ
--
*** If you are not part of the solution, then you are the problem. ( ) ***
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On Tue, Nov 17, 2020 at 04:14 PM, Martin J.K. wrote:
the NanoVNA-App software by One Of Eleven supports display of the
admittance and reactance Smith Charts side by side.
Is that what you are asking?
Hi Martin, Yes that's the sort of thing, but my understanding is that it is an Android application, but I've not been able to find it. Do you have a link you could share ? Regards, Martin -- Regards, Martin - G8JNJ
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Hi Martin
no no, it's a Windows app, although I beleive it could be compiled for nixxies and maccies, maybe even andies but not sure.
Anyway, it's a Windows app and you'll find it here ..
You only need the .exe, the other bon files are the firmware I was working on.
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On Wed, Nov 18, 2020 at 11:02 AM, OneOfEleven wrote:
Anyway, it's a Windows app and you'll find it here ..
Great, thanks for that. I'd already looked through the NanoVNA references and performed a Google search but couldn't find it. -- Regards, Martin - G8JNJ
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Fortunately NanoVNA-Saver is python using qt, so it's not too tough to add functionality. Usually what's tricky is figuring out how to do the UI so it's not confusing and overly complex - the worst thing is having 100 little click boxes and radio buttons.
I'm not a UI designer, and I'm not facile in the particular toolset
I'd start in drawSmithChart in Smith.py in the Charts directory. That's what basically creates the "paper" upon which the datapoints are drawn.
You probably want to be able to turn them on and off, and potentially set how many and what value - and that's where the trickyness comes in.
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Hi Gyula,
As I said, I'm not complaining. I was in contact with Rune a year ago. Since then I have never made a reference to the wish of admittance graphs in the Smith Chart.
Reason why I asked in the first place, is because I do a lot of teaching to hamradio students and also talk about Smith Charts and mathing impedances. I show what happens to measured impedance when adding a series or parallel component, and it is enlightening for many. NanoSAVER is a very good tool to show this but at this time only for the impedance circles (=adding components in series).
I'm not a programmer and adding a few impedance circles in the nanoSAVER software is unknown territory.//I would not know where to begin. So I jumped on the wagon when someone started this thread to ask attentention. Not forcing anybody and still praying a humble thanks for what has been developped in the past year.
73 all,
Arie PA3A
Op 18-11-2020 om 11:31 schreef Gyula Molnar:
toggle quoted message
Show quoted text
Hi Arie,
you know that the original creator of NanoVNA-Saver (Rune 5Q5R) will no longer be working on this project from the beginning of this year. Unfortunately, I can also imagine that this was His "swan song." Anyone who has taken it over and will carry it on will probably be able to do it in their spare time as a hobby.
Indeed, there are and are improvements in this topic in other programming teams. Since their developments are ongoing and they are made for their own use, it is up to them to decide when and what to share. Anyone who listens knows what I'm talking about.
Please be patient and you can try this for yourself.
73, Gyula HA3HZ
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I would offer the idea of using a pre-calculated graphic overlay for the scales in the programs like NanoSaver. It seems a waste of processing to have to compute the chart impedance or admittance graphs every time the program is run. The fact is, they never change. I am not a programmer and don't know if there is support for this in QT, but I have made use of this method in Excel. Just use the saved picture of the chart as the "overlay" and all you need to compute / plot are the reflection coefficients. Again, not being a software type, I may be way off base here and would appreciate feedback on this.
On of my favorite tools for building and visualizing matching networks with the Smith Chart is at:
You can input s-parameters or use the keyboard or mouse to enter points and toggle impedance or admittance graphs on or off.
It allows elements to be cascaded between source and load. The demoversion is limited to 5 datapoints and 5 elements.
- Fritz Dellsperger was a Professor for RF and Microwave Engineering
at Bern University of Applied Sciences from 1992 to 2012, now retired.
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NanoSaver already calculates serie and parallel impedances. That's not the issue.
Only thing the Smith chart display needs (for educational purpose) is this circle pattern of the standard chart flipped around in another color. We can already swith on and of SWR circles (which is great!)
I just hope that one of the hobby-programmers thinks it might come in handy so he or she would add this to nanoSaver. If not, I can live with that. Programmers have done so much already.
73
Arie PA3A
Op 19-11-2020 om 14:18 schreef W1RS:
toggle quoted message
Show quoted text
I would offer the idea of using a pre-calculated graphic overlay for the scales in the programs like NanoSaver. It seems a waste of processing to have to compute the chart impedance or admittance graphs every time the program is run. The fact is, they never change. I am not a programmer and don't know if there is support for this in QT, but I have made use of this method in Excel. Just use the saved picture of the chart as the "overlay" and all you need to compute / plot are the reflection coefficients. Again, not being a software type, I may be way off base here and would appreciate feedback on this.
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Arie Kleingeld PA3A
Gyula Molnar