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Re: Identifying ferrite materials with S11 measurements

 

On Tuesday 14 July 2020 04:06:08 pm alan victor wrote:
Wind 2 turns on all units whose perm values vary from say 40-10,000 (type 67, 65, 64, 43, 73, 75, 76)
Just curious, do the types you refer to here mean any specific manufacturer? Or are the same type numbers used by more than one? I have started to collect some mfr. data but haven't gotten very far along that path...


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Member of the toughest, meanest, deadliest, most unrelenting -- and
ablest -- form of life in this section of space, ?a critter that can
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Information is more dangerous than cannon to a society ruled by lies. --James
M Dakin
Re: Identifying ferrite materials with S11 measurements

 

Hi Graeme,

These plots as you stated represent the inductance and loss terms for the ferrite material. Dependent on the construct for the sample to be tested, the leakage inductance can vary and hence the loss term. So as a consequence the crossover point can move dependent on the sample build, for the same ferrite. Consider, if you have Identical ferrite forms, say 2 - hole cores, same physical size. Wind 2 turns on all units whose perm values vary from say 40-10,000 (type 67, 65, 64, 43, 73, 75, 76) you should see a plot of initial permeability (perm values that are well below the crossover point), that increases with larger perm. In all cases, if the measurement frequency is kept low, say below 1 MHz, the L value obtained from a S11 measure would simply increase. That would be a good place to start in an effort to be able to categorize the ferrite material.

Alan
Re: NanoVNA firmware user interface mod #mods

 

I'll test it right now !!
Thank you!
Re: NanoVNA firmware user interface mod #mods

 

When you save the screen shot keep your finger on the screen until it tells you all is OK. That way you know it's saved.
Re: NanoVNA Saver 0.3.3 or 0.3.4

 

Vy Thanks Holger and Gyula !!!

I try...

Vy 73

Enrique LU8EFF


-----Mensaje original-----
De: [email protected] [mailto:[email protected]] En nombre de Gyula Molnar
Enviado el: martes, 14 de julio de 2020 13:43
Para: [email protected]
Asunto: Re: [nanovna-users] NanoVNA Saver 0.3.3 or 0.3.4

ps.: /g/nanovna-users/attachment/10650/0/Installing%20Python%20on%20Windows7-32%20for%20nanoVNA-Saver.pdf

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*** If you are not part of the solution, then you are the problem. ( ) ***




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Re: NanoVNA firmware user interface mod #mods

 

Have fixed the SD card routines now Igor.

2020.Jul.14-2_OneOfEleven_mod_of_DiSlord.rar
2020.Jul.14-2_OneOfEleven_mod_of_DiSlord.rar

Re: Emails

 

You can change your email preferences for the nanovna-users group by logging into the nanovna-users group and going to your account preferences web page.

DaveD

On Jul 14, 2020, at 14:14, Ken Walker <ken.walker8368@...> wrote:

Hi,

Can I receive emails like a digest just once a week please?

I am snowed under by the emails I am getting.

Thanks

Ken Walker
Re: Firmware locations

 

I upload my firmware to file section
/g/nanovna-users/files/Dislord%27s%20Nanovna%20-H%20Firmware
Re: NanoVNA firmvare, compiled by DiSlord #firmware with MiniSD support #firmware

 

I am new to using Python, but I have it installed On Windows 10. What is the command syntax to compile the new build?

Gary
Re: Emails

 

Take the link to the Wiki.

Then click Subscription in the Left Column. You have the choice to set your preferences.


73 KE0ZUW

On Jul 14, 2020, at 1:14 PM, Ken Walker <ken.walker8368@...> wrote:


Can I receive emails like a digest just once a week please?

I am snowed under by the emails I am getting.

Thanks

Ken Walker

-=-=-
Learn about the NanoVNA in the following forum areas:

Knowledge-based Wiki: /g/nanovna-users/wiki
Emails

 

Hi,

Can I receive emails like a digest just once a week please?

I am snowed under by the emails I am getting.

Thanks

Ken Walker
Re: NanoVNA firmvare, compiled by DiSlord #firmware with MiniSD support #firmware

 

yes, AND in Makefile uncomment the line with UDEFS..

#Enable if install external 32.768kHz clock quartz on PC14 and PC15 pins on STM32 CPU
#UDEFS+= -DVNA_USE_LSE
Re: NanoVNA firmvare, compiled by DiSlord #firmware with MiniSD support #firmware

 

Sorry for the dumb question, but if I want to build the latest firmware for the H4 with RTC & SD Card, I need to uncomment the #defines on lines 25 & 27 of nanovna.h and then run make?

Thanks,
Brian
Re: Identifying ferrite materials with S11 measurements

 

Graeme, I've had the identical experience, even using the HP 8753C VNA
calibrated properly. I don't get it, either.

Dave - W?LEV

On Tue, Jul 14, 2020 at 4:12 AM Graeme Jury <gvjury@...> wrote:

Hello Group,

Yes I know that this has been pretty fully dealt with before and I have
read all the posts but I still can't get a consistently good result.

The method that I used was to tightly wrap a single turn of 24 swg wire
around the core (or 1 turn looped through the balun core) and soldered with
minimum lead length to an sma female connector and run an S11 R/w & X/w. I
tested on a range of type 43 cores and the FT50-43 and BN43-202 matched
well plus the X = R crossover came out where I expected but the others came
out widely different and seemed to give results more like I would expect
from type 61 material.

I also experimented with an FT240-43 core and could not get the X and R
lines to crossover with 1 turn at all so I tried 2 turns and got a
crossover at around 80 MHz and 3 turns at about 25 MHz (going from memory
here as I didn't screenshot this) so I am missing something entirely I
think. I will look into Jeff Anderson's work

and see if there is a better approach that I can make but it means that I
will need to come to grips with matlab which I have not done up til now so
there will be a time delay until I get some results.

Naturally I am hoping that someone will come up with "Hey Graeme, you
didn't do this" as I am feeling that there is more that I have not done
like maybe a low inductance copper tape around the core or something.

73, Graeme ZL2APV



--
*Dave - W?LEV*
*Just Let Darwin Work*
Re: NanoVNA Saver 0.3.3 or 0.3.4

 

ps.: /g/nanovna-users/attachment/10650/0/Installing%20Python%20on%20Windows7-32%20for%20nanoVNA-Saver.pdf

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*** If you are not part of the solution, then you are the problem. ( ) ***
Re: NanoVNA Saver 0.3.3 or 0.3.4

 

I confirm that 0.36 works under Python 3.7.4 installed on windows 32 bit. You need to install Python and the required modules in advance. See the required modules in the NanoVNA Saver .zip / requirement.txt

I note that versions 0.3.0 ... 0.3.4 do not work this way.
73, Gyula HA3HZ
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*** If you are not part of the solution, then you are the problem. ( ) ***

NanoVNA_Saver_0.3.6-pre.png

To Dave Daniel #rant

vaclav_sal
 

What a cop-out!
How about instead of "taking you ball and going home " DO SOMETHING constructive , even NON TECHNICAL for amateur radio?

Amateur radio operators are known for rag chewing - also know as " chewing the fat " by normal folks.

Would it destroy the technical integrity of this group to just let them "blow off the steam" once a while ?
( You do not have to read it or participate and memory is cheap )

Cheers

This message will self destruct when I get a "round tuit"
Re: NanoVNA Saver 0.3.3 or 0.3.4

 

On 14.07.20 09:43, pgc1682@... wrote:
Hi,

I have same problem, my ultra portable laptop 32 bit only w10.

Lajos
You can stll try to install from source.

First you need python from the microsoft-store.
Then clone the git (or download as zip).

In the source directory running following in the commands in
the console.

python -m pip install --upgrade pip setuptools
pip install -r requirements.txt
then
python nanovna-saver.py

should start the program.

But some Windows guys can surly give more hints.

73
Holger, DG5DBH
Re: noise on screen

 

Hi,
Like the others have written, its the measured phase of the S21
measurement, and as nothing is connected between ch0 and ch1 you only see
the noise in the ch1 receiver.
It also looks like you don't have a good calibration. If there is nothing
connected to ch0 in the picture, you need to redo it.
Remember to always press reset before you start the calibration...

Br,
Askild

On Tue, Jul 14, 2020 at 10:23 AM "Reske, Jim NB3P" <jgreske@...>
wrote:

Hi, i just purchased a nano vna and can't seem to get it working
properly. When i ruen the unit on i get only what i can describe as noise
on the screen. When i calibrate the unit, the screen does not go blank but
continues to display the noise. Ive tried resetting the unit but that did
not help. Am i doing something wrongbor di I have a defective unit ? See
the attachment for a photo. JIM NB3P
Locked Re: The Uncertain Future of Ham Radio - IEEE Spectrum

 

All,

I am locking this thread. No further posting will be allowed.

Despite my earlier admonition to keep this technical, there continue to be posts which are entirely non-technical.

DaveD

On 7/10/2020 11:32 PM, Larry Rothman wrote:
Interesting article:

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