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Hi Maurizio,

Yes, what is displayed is the value of X when Y is at maximum and it is the total delay
and needs to be divided by 2. With regards to segmented sweep to increase the
number of points, I will try to implement that in the software.

Kind regards,

neb

Hi Daniel;

See Post #8459 - #88 : the G formula - our research work has been completed.

I think you will find the formula given there both relevant and efficient. It yields the corrected reflection coefficient result in one pass by embedding the calibration and measurement data into a single formula.

Your application will also serve as an excellent beta test for the authors GIN&PEZ@arg who I am certain would very much welcome your comments.

This was posted today, so I have not yet personally evaluated the algorithm in this final form. I have independently verified a previous version, and find the integrity of their work to be sound and thorough. I’m confident that I will find the same to be true here also.

They also provided the “proof” for this in an earlier post #8013.

--
73

Gary, N3GO

Hi Jos,

Try excluding the nanoVNAPartner0.19.exe file in Norton.

Kind regards,

neb

On Sat, Dec 21, 2019 at 04:50 PM, <neb40gsm@...> wrote:

You’re welcome Kurt and big Thanks also to all who liked the software.

Kind regards,

neb

Hi neb , many thanks for the nanoVNA Partner program , very nice.
Why not implement the multiple scan ( segmented sweep) , to increase number of points ?
One little mistake or undestand : measuring a cable RG58 C/U VF 0.66
on chart forma TDR , a cable length is ok ( 2.07 m ) , but the delay indicated I suppose need to be divided bye 2.
Best Regards
Maurizio IZ1MDJ

On Sat, Dec 21, 2019 at 07:17 AM, Lawrence Macionski wrote:

When I download NanaVNA-Webapp-nightly-e20d9ae.apk from the Github.com/cho45 on my 4 month old Amazon Fire 10. using web browser "Silk" I click on the .apk
and get a popup, "Do you Want to Download" I click, "OK" it gives me another popup "Done do you want to open? I click on OPEN and I get "PARSE ERROR -
There was a problem parsing the package." I downloaded the package x2 times. I also tried AKP INSTALLER app I had downloaded and used a number of times.. Same issue. Same error.

<This parsing error generally on an android device if the apk you are trying to install does not support the version of Android installed on your device.>

Second ITEM.. I have performed the "GOOGLE PLAY install to my Fire" at least 2 months ago, used it a number of times. No problem.. A number of posts talk about downloading "NanoVNA" from GOOGLE PLAY and it will run on the FIRE... When I go to GOOGLE PLAY I do not find any app named "NanoVNA" but find one named BLUE VNA.. and others like Metro VNA by the same author... What is very interesting is I just logged into google play using this Windoze 7 machine and I can find NanoVNA by cho45 just fine. Apparently the issue is on the FIRE. Blue VNA is written by DAn Toma- I can search on either and get it, but NanoVNA or cho45 brings me nothing.. Finally - On my Motorola moto e* plus... NanoVNA by cho45 is 1st on the list...humm.... moto e* is android 8.0.0 the Fire is Fire OS 5.6.4.0... all I can find regarding it's OS.. it was an "on sale" and a lot faster than my 4 yo Samsung.

<Related to the first comment. Google Play will not display apps that have a higher android version requirement than the target device. The requirement stated for the NanoVNA is "Requires Android 7.0 and up". The Web based interface has looser requirements and sometimes works when the apk will not. Try running with WebUSB by accessing >

Merry Christmas..

<Happy Holidays to you, too.>

- Herb

Sorry Neb still the same problem, don't know how yo overrule Norton.

Kind regards

Jos


Op 21-12-2019 om 16:19 schreef n2msqrp:

I finally got Norton to prompt me and I restored it. Thanks for the program.

Mike N2MS

You’re welcome Kurt and big Thanks also to all who liked the software.

Kind regards,

neb

Hi Mike,

Norton is agressive, Eset NOD32 is work well but not víruses.
This program work well, without problem.
Thank You neb!

73, Gyula HA3HZ

Hi Neb
Works great, I like your approach to user interface very much
Thank you for the new version
Kind regards
Kurt

-----Oprindelig meddelelse-----
Fra: [email protected] <[email protected]> P? vegne af neb40gsm via Groups.Io
Sendt: 21. december 2019 09:54
Til: [email protected]
Emne: Re: [nanovna-users] nanoVNA Partner #nanovna_partner

nanoVNA Partner v 0.19

- Max and Min points unit of values displayed fixed;
- Main chart size can now be horizontally increased;
- Added Q-Factor on the main chart;
- Added separate Cal Reset button on its calibration procedure menu;
- Minor grid in all of its charts are enabled;
- And added Recall ID display to be able to monitor what calibration memory is being used.

If interested, download it from here:

Kind regards,

neb

My Norton also deleted it and I cannot restore.

Mike N2MS

When I download NanaVNA-Webapp-nightly-e20d9ae.apk from the Github.com/cho45 on my 4 month old Amazon Fire 10. using web browser "Silk" I click on the .apk and get a popup, "Do you Want to Download" I click, "OK" it gives me another popup "Done do you want to open? I click on OPEN and I get "PARSE ERROR - There was a problem parsing the package."
I downloaded the package x2 times. I also tried AKP INSTALLER app I had downloaded and used a number of times.. Same issue. Same error.

Second ITEM.. I have performed the "GOOGLE PLAY install to my Fire" at least 2 months ago, used it a number of times. No problem.. A number of posts talk about downloading "NanoVNA" from GOOGLE PLAY and it will run on the FIRE... When I go to GOOGLE PLAY I do not find any app named "NanoVNA" but find one named BLUE VNA.. and others like Metro VNA by the same author... What is very interesting is I just logged into google play using this Windoze 7 machine and I can find NanoVNA by cho45 just fine. Apparently the issue is on the FIRE. Blue VNA is written by DAn Toma- I can search on either and get it, but NanoVNA or cho45 brings me nothing.. Finally - On my Motorola moto e* plus... NanoVNA by cho45 is 1st on the list...humm.... moto e* is android 8.0.0 the Fire is Fire OS 5.6.4.0... all I can find regarding it's OS.. it was an "on sale" and a lot faster than my 4 yo Samsung.

Merry Christmas..

Consider this post NO COMPLAINT but rather REPORT OF FINDINGS...

#88 : the G formula - our research work has been completed

Hello,

Allow us, please, to present the complete G formula - in our sow and
facupov, of course - at:



in terms of its measurement g, as well as of S, L, O loads given
by their honest manufacturers as (Nominal Value, Uncertainty)
couples, and their measurements s, l, o respectively - all complex.

By the way, also allow us, please, to announce -with much pleasure,
indeed- that our related research work in this very subject
-
that is on the assumption that the VNA measurement g caused by a
connected to VNA load G can be considered as obeying the equations
of an irreversible, non-reciprocal, two-port - a virtual-real one consisting
of a virtual measurement port and a real load port - along of course with
their errors caused by the inaccuracies of these measurements and the
uncertainties of these loads
-
has been substantially completed, since in our Small Objective World
sow we can not see anymore any further existing omissions in this picture
facupov From A Common User's Point Of View.

Sincerely,

gin&pez@arg

:88#

Jos,

Try or
contact me through email.

Kind regards,

neb

FYI, a (new) digital version of QEX will be available to all ARRL members starting early next year. If you want the print version, you’ll need to subscribe.

Mark W8EWH

Hi

Both addresses give message from Norton " Dangerous Webpage"

Sorry

Jos

Op 21-12-2019 om 09:49 schreef neb40gsm via Groups.Io:

Yeah, the original Nano (and mini/pocket VNA, plus most old HP gear) are like that. It's possible to remove the drift (and I mean not having to re-calibrate after warmup) with an internal correction switch (basically a switch that shorts port 1 to ground) which I've added in my design; hopefully others will follow.

The difference is, that after warmup one gets repeatable results. When I calibrated the cold VNA and started to measure, maybe the very first results showed true numbers, but very soon results drifted (see the figure to my initial posting). I feel much better when repeated measurement show the same number. Otherwise there is always a bad taste...

Chris

nanoVNA Partner v 0.19

- Max and Min points unit of values displayed fixed;
- Main chart size can now be horizontally increased;
- Added Q-Factor on the main chart;
- Added separate Cal Reset button on its calibration procedure menu;
- Minor grid in all of its charts are enabled;
- And added Recall ID display to be able to monitor what calibration memory is being used.

If interested, download it from here:

Kind regards,

neb

Look in the source code of nanoVNA-saver on github

Or if you only require perfect calibration standards use this:


plusJ=complex(0,1);
minJ=complex(0,-1);
one=complex(1,0);
two=complex(2,0);


gm1 = S; #Measured Short
gm2 = O; #Measured Open
gm3 = L; #Measured Load
s21m = T; #Measured Through


g1=complex(-1,0)

g2=complex(1,0);

g3=complex(0,0);

denominator = g1.*(g2 .- g3).*gm1;
denominator = denominator .+ g2.*g3.*gm2 .- g2.*g3.*gm3 .- (g2.*gm2 .- g3.*gm3).*g1;
e00 = - ((g2.*gm3 .- g3.*gm3).*g1.*gm2 .- (g2.*g3.*gm2 .- g2.*g3.*gm3 .- (g3.*gm2 .- g2.*gm3).*g1).*gm1) ./ denominator;
e11 = ((g2.-g3).*gm1.-g1.*(gm2.-gm3).+g3.*gm2.-g2.*gm3) ./ denominator;
deltaE = - ((g1.*(gm2.-gm3).-g2.*gm2.+g3.*gm3).*gm1.+(g2.*gm3.-g3.*gm3).*gm2) ./ denominator;

e10e32 = s21m .* (one - (e11.*e11));

ed = e00;
es = e11;
et = deltaE;

th = e10e32;



--
NanoVNA Wiki: /g/nanovna-users/wiki/home
NanoVNA Files: /g/nanovna-users/files
Erik, PD0EK