Re: New version of NanoVNA-Saver: 0.2.1
Hi Rune,
Thanks for a great interface program for the NanoVNA. I have run into a problem I do not understand in carrying out a calibration using nanovna-saver 0.2.1 (also 0.2.0). I have the frequency range set to 50 kHz - 50 MHz. If I use the Calibration assistant the calibration is accepted when I press Apply. However if I use the buttons, waiting enough time I believe between stages for the scan to complete, and press "Apply" I get the error box
" Error applying calibration
Two of short, open and load returned the same values at frequency 50016 Hz.
!
OK "
I have repeated this sequence several times and get the same error. I don't think I am making a mistake in connecting the calibration impedances. The calibration sequence works fine for me using the Calibration Assistant or using NanoVNA.exe. I must be doing something stupid that is not obvious to me.
73, Dick, W0QM
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Re: Choke Series resonant frequency measurement
The resonance of a choke is measured by connecting it to the S0 port.? You select Smith chart and, with the frequency at a low value you read the inductance on the screen, with the plot being a dot at the left edge.? (First you select S0 reflection mode.)
Then you sweep the frequency up until the chart becomes a circle.? The point where it passes halfway around, to the right edge, is the resonant frequency.? You carefully adjust the frequency until the inductance reading on screen switches to capacitance.? That's resonance.
Bob K6DDX
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On Sunday, December 22, 2019, 08:00:43 AM PST, Ady, YO2NAA <yo2naa@...> wrote: Will the reactance of NanoVNA's channels? influence the resonant frequencies of the choke, or the calibration process is removing this influence? If the influence is present, what method will minimize it the most? Should the choke be measured mounted in the PA, to include the influence of the neighboring objects? 73 Ady YO2NAA On Sun, Dec 22, 2019 at 2:34 PM Jim Potter <jpotter@...> wrote: To find a series resonance you are looking for the frequency where the
impedance is a minimum.
All three techniques you suggest will work.
1. Series between two ports, look for the frequency of maximum S21
2. Shunt, you only need 1 port. Look for the frequency of a dip in S11.
Don't connect Port 2
3. With two coupling coils the result will be like #1, The frequency for
maximum S21 is the self resonance
4. With one coupling loop the series resonance will be the minimum in S11,
like #2. This is pretty much what you are doing with the grid dip meter,
looking for maximum energy absorption,
Try all of these techniques to see the difference. That's one of the great
thing about the nanoVNA it's a great educational tool at an affordable
price.
73 de K9GXC, Jim
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Hi Larry,
I can explain stop, start and centre but not span:
Essentially, these commands allow you to set the frequency range or span using the position of the active marker. Make sure the current onscreen frequency span is greater than what you actually require so you can use the marker settings to 'zoom-in'.
For simplicity, enable only one marker.
Now place (drag) the marker to the starting frequency of the range you want to investigate. You can read the marker freq onscreen at the upper right area of the display as you move it.
Open the Marker menu and click the Start button and you will see the start freq at the lower left of the display change to the current marker freq.
Now move the marker to the maximum frequency of the range you're interested in and again, open the Marker menu and press the Stop button.
The upper frequency shown at the lower right of the display will now change to that value. You now know how to set the start and stop frequencies using the marker menu.
To set the span, you will use the Center menu button. You set the start freq as before but the second entry will be to move the marker to centre frequency you're interested in and press the Center menu button. This will automatically adjust the start and stop frequencies to be equal, either side of of the center.
As for the Span button, it just turns green when pressed and does not seem to do anything. I will have to look at the source code to see what that's about.
I hope this helps. I will update the user guide with this information soon.
Regards
Larry
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Never mind, I finally found the information I was looking for.
As usual, as soon as I post a question, I find the answer.
Larry
n0sa
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Re: Looking for firmware with battery indica
sorted it,i followed the first link,realsed its the bottom one thats the latest on the firmware list pdf.
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Re: QEX Magazine #tutorials.
I'm confused.? How is that legal??? The following quote is taken directly from the terms of use at librarycat.com:
"You may not post any content that violates copyright or other intellectual property law."
Please explain.
Dave?? AB7E
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On 12/22/2019 4:22 AM, David Wilcox via Groups.Io wrote: Or if you have the issue in question donate it to Paul W0RW¡¯s radio lending library. Then others can check it out via mail and enjoy it, even make a copy of the article for their own use. All perfectly legal.
Paul¡¯s lending library. Check it out.
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Re: errors of "error" models
#90.02 : A Comment on [SAMoEEiVNAM] Technique - #90.00 : A Practical Introduction to our -Second- Arithmetical Method of Error Estimations in VNA Measurements : [SAMEEVNAM] 22 December 2019 - /g/nanovna-users/message/8505Hello, We are terribly sorry for the inconvenience, but we had to also notice already that this our Second Arithmetic Method : ) does not based on higher mathematics at all, since it only involves the very simple form, very easily programmable - more simple than these two simplifications are simply impossible : D - arithmetic of: #88 : the G formula - our research work has been completed 21 December 2019 - /g/nanovna-users/message/8459Specifically, this formula is used once with the Nominal Values of the Standards, as these are provided by their Manufacturers, thus resulting in a Nominal Value Z, by using the well-known formula, and then once more, with some Error Value of the Standards, as it is selected by The Common User to be within the limits posed by their Decent Manufacturers, resulting in an Error Value Zt, respectively. Finally, The Common User takes the difference (Zt - Z), extracts its real and imaginary parts and calculates the percentage differences of them. That's all. : D ) Sincerely, gin&pez@arg :#90.02
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Hi Frank,
When an option of ARRL membership was a CD received at the end of the year,
then I took that option. This was an economic choice as the CD contained
not only QST but NCJ (no interest) and QEX. I enjoyed reading the excellent
technical articles published in QEX.
Life here in the UK is considerably more expensive that in the USA. One
just has to compare the cost of housing and gasoline. It was a shock to our
American daughter-in-law when she moved to live in the UK.
The ARRL closed the CD option and now I get the digital QST only.
I cited 13 sources in the bibliography and 114 sources in my reference
list.. My earliest QST reference was from 1916 - Tuska - The oscillating
Audion - when positive feedback was first being investigated. (I have a
copy of Black's book among the pile here). Access to patents, bound copies
of the journal of the IEE proc.IRE etc. helped enormously.
Now we must leave the NanoVNA forum for more relevant correspondence.
Phil G3SES
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On Sun, 22 Dec 2019 at 15:44, Frank Howell <frankmhowell@...> wrote: All,
Just know that *soon* all ARRL members will have electronic access to QEX
and NCJ issues via the ARRL.org website, although print issues will still
require a subscription.
And, be aware that there IS the Fair Use provision in the copyright law.
You do NOT need permission to quote a copyrighted work with source citation
for limited and reasonable amount. Others have cited the appropriate legal
source. I suspect Phil, that in your large dissertation (mine was two
volumes), you quoted numerous sources with citation, no?
73,
Frank
K4FMH
ARRL Asst Director, Delta Division
Editor-in-Chief, Springer (ret.)
Professor Emeritus, Mississippi State University
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I am a bit confused on the Marker Menu and the Markers in general.
I know I can turn them on and off and move them and read the values on the screen.
I know that I can click on one and then the others show a Delta value.
What I do not understand is the >Start, >Stop, >Center, etc on the marker menu and what they do.
Any help or point to a description would be appreciated.
Larry
n0sa
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Re: NanoVNA connected to Amazon Fire tablet
On Sun, Dec 22, 2019 at 07:07 AM, Lawrence Macionski wrote:
I bought the Amazon Fire Tablet August 23, 2019 --- Exactly 4 months ago...
===============================================================
Lawrence
According to your previous message your Amazon Fire Tablet has OS 5.6.4.0. The wiki at shows OS 5.6.4.0 is based on Android 5.1.1 Lollipop.
That explains why Google Play Store will not display the NanoVNA app on your tablet. The wiki also says your Fire Tablet is 7th generation. I believe 8th and 9th generation Fire Tablets work fine with the NanoVNA apk.
- Herb
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Re: Choke Series resonant frequency measurement
Will the reactance of NanoVNA's channels influence the resonant
frequencies of the choke, or the calibration process is removing this
influence?
If the influence is present, what method will minimize it the most?
Should the choke be measured mounted in the PA, to include the influence of
the neighboring objects?
73 Ady YO2NAA
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Show quoted text
On Sun, Dec 22, 2019 at 2:34 PM Jim Potter <jpotter@...> wrote: To find a series resonance you are looking for the frequency where the
impedance is a minimum.
All three techniques you suggest will work.
1. Series between two ports, look for the frequency of maximum S21
2. Shunt, you only need 1 port. Look for the frequency of a dip in S11.
Don't connect Port 2
3. With two coupling coils the result will be like #1, The frequency for
maximum S21 is the self resonance
4. With one coupling loop the series resonance will be the minimum in S11,
like #2. This is pretty much what you are doing with the grid dip meter,
looking for maximum energy absorption,
Try all of these techniques to see the difference. That's one of the great
thing about the nanoVNA it's a great educational tool at an affordable
price.
73 de K9GXC, Jim
|
Re: errors of "error" models
#90.01 : Final Conclusion - #90.00 : A Practical Introduction to our -Second- Arithmetical Method of Error Estimations in VNA Measurements : [SAMEEVNAM] 22 December 2019 - /g/nanovna-users/message/8505Hello, Allow us, please, to conclude from the last two lines of the computed arithmetical results: as well as, from their graphical representation: that in this particular instance, the Least Core Uncertainty - that is the component of the Uncertainty which is propagated only by three HP Standards to the results of Zt measurement using our [NanoVNA] System - is arithmetically estimated to be more than: ( Rt : +5% , Xt : +13% ) Sincerely, gin&pez@arg #90.01:
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All,
Just know that *soon* all ARRL members will have electronic access to QEX and NCJ issues via the ARRL.org website, although print issues will still require a subscription.
And, be aware that there IS the Fair Use provision in the copyright law. You do NOT need permission to quote a copyrighted work with source citation for limited and reasonable amount. Others have cited the appropriate legal source. I suspect Phil, that in your large dissertation (mine was two volumes), you quoted numerous sources with citation, no?
73,
Frank
K4FMH
ARRL Asst Director, Delta Division
Editor-in-Chief, Springer (ret.)
Professor Emeritus, Mississippi State University
|
Re: NanoVNA connected to Amazon Fire tablet
I bought the Amazon Fire Tablet August 23, 2019 --- Exactly 4 months ago...
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On Sat, Dec 21, 2019 at 06:55 PM, Gary O'Neil wrote:
it is the objective of calibration to normalize the measured standards to
those boundaries.
Hi Gary, Actually, it is the objective of calibration to normalize the measured standards to their imperfect definitions, not to the ideal boundaries. For example, let's say the actual short standard has a Gamma of -0.99 + j0.01. After calibration, if that short is then attached to the VNA's port, the VNA should display -0.99+j0.01 as its Gamma. And if this is the result that the new algorithm would generate, great! But if the new equation normalizes it to -1,0, there's a problem. One of the beauties of the traditional one-port, 3-term error model is that the three standards used for calibration could be anything and do not need to be S.O.L. -- as long as you know the Gammas of the standards, you can use these "actual" Gammas, plus their three measured Gammas, to error-correct your "Device Under Test" measurements. In other words, if you substitute the equations for e00, e11, and delta_e into the traditional equation Gamma(DUT,actual) = (Gamma(DUT,measured - e00)/(Gamma(DUT,measured)*e11 - delta_e), you will get a single function in terms of 7 parameters. I.e: Gamma(DUT, actual) = function(Gamma(DUT, measured), Gamma(S1, measured), Gamma(S2, measured), Gamma(S3, measured), Gamma(S1, actual), Gamma(S2, actual), Gamma(S3, actual), where S1, S2, and S3 are the three calibration standards. But this is a very messy equation, and usually its calculation is broken up into several steps, i.e. the separate calculation of e00, e11, and delta_e, as e00 and e11 are also used in the 12-term 2-port correction. But, if just doing 1-port S11 measurements, there's no reason why Gamma(DUT,actual) can't be expressed, and solved, as a single equation of seven parameters. If the new equation is also a function of the same seven parameters, but if it looks different from the traditional equation "expanded out", then it should be possible, through equation manipulation, to show that the two are equivalent. If this cannot be done, then I would suspect an error or incorrect assumption. Anyway, this is not to say that the new equation is not correct, but I'm personally hesitant to declare it "finished" until I see more information. - Jeff, k6jca
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Re: errors of "error" models
#91: Elevating a [NanoVNA] System to an Instrument of Laboratory Level
Hello,
Allow us, please, to declare that our research efforts here have to do with our
curiosity regarding the investigation of the possibilities to certify the use of a
[NanoVNA] System as an Instrument of Laboratory Level.
Such a Cause is attainable not only through a serious comparison of it with
existing [LabVNA]s but, much more than that, by the careful and reliable
estimation of the Uncertainty Core of its measurements.
And as you may see, from our thoughtful route in this thread until now, this is
a time consuming process successively rewarding step-by-step The Common
Users like us.
Sincerely,
gin&pez@arg
:#91
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Thank you for that link Herb,
I am an (foreign) ARRL member and also read QEX (wonderful magazine). I lost a QEX-article that I particularly find interesting and now found it back again in the archive.
73,
Arie PA3A
Op 22-12-2019 om 01:06 --? hwalker:
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Dr. Steber is one of my favorite authors. He has published easy to follow articles on DIY VNA's and other instruments in QEX magazine and Nuts and Volts magazines over the years. Pretty much all those articles are available for download on the web. Its usually just a matter of waiting for some time after the initial magazine is published before selected articles start to appear.
Entire QEX magazine archives from 1982-2016 have been available at for some years now.
I don't have a subscription to QEX but if there is content that interests me I do purchase individual issues as a way of supporting the author and encouraging him to publish future articles.
- Herb
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Re: Looking for firmware with battery indica
Did you download from the github repo at:.??
Its a zip'ed file. Everything you need is inside the file and you need to extract what you want and yes, the dfu filen is there.?
Use 7zip or the windows built-in unzip utility.?
On Sun, 22 Dec 2019 at 6:28 AM, nanovnauser@...<nanovnauser@...> wrote: ive downloaded the reald firmware but there is no hex or dfu file??
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Re: Choke Series resonant frequency measurement
To find a series resonance you are looking for the frequency where the impedance is a minimum.
All three techniques you suggest will work.
1. Series between two ports, look for the frequency of maximum S21
2. Shunt, you only need 1 port. Look for the frequency of a dip in S11. Don't connect Port 2
3. With two coupling coils the result will be like #1, The frequency for maximum S21 is the self resonance
4. With one coupling loop the series resonance will be the minimum in S11, like #2. This is pretty much what you are doing with the grid dip meter, looking for maximum energy absorption,
Try all of these techniques to see the difference. That's one of the great thing about the nanoVNA it's a great educational tool at an affordable price.
73 de K9GXC, Jim
|
Re: Looking for firmware with battery indicator, 1500 and big font
ive downloaded the reald firmware but there is no hex or dfu file??
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gin&pez@arg
K4FMH
Larry Macionski
Arie Kleingeld PA3A