开云体育

#72 : facupov : confirmation and suggestion

@QRP RX - 5 November 2019 : /g/nanovna-users/message/6471
@Bob Albert - 5 November 2019 : /g/nanovna-users/message/6472
@ johnshouse100@... - 5 November 2019 : /g/nanovna-users/message/6473

Hello,

Thank you very much for your interest on this central point of our work and thus
allow us, please, not only to confirm your guessing but also to suggest you the
reading of the following message:

#62 : On the Most Reasonable Questions with the Most Clear Answers
20 October 2019 : /g/nanovna-users/message/5334

Sincerely,

gin&pez@arg

: 72#

Hi Oristo

Good to hear about success.
It may be a crazy user interface for you being a custom to something else, but not really for me as been the only VNA for me since it's birth. It is for more than 10 years and I still discover something new right click now and then ?
It started as a DG8SAQ Tom Baier "birdnest" ham project, and concept verified by student project at ULM University, where Tom is a teacher and then it expanded gradually over the years to the fantastic complex level it has to day.

Kind regards

Kurt



-----Oprindelig meddelelse-----
Fra: [email protected] <[email protected]> P? vegne af Oristo
Sendt: 5. november 2019 12:29
Til: [email protected]
Emne: Re: [nanovna-users] VNWA software #calibration



Hi Kurt -



Thanks for the additional hints, so essential success!

double click on any trace type name on the lower line

... which for the attached VNWA main window are 'Log Mag' or 'Smith'

the page come up with all the trace settings

.. which is titled 'Display Settings', also attached

another long drop down list S21, S11, S12, S22 and so on, and here you

find the 6 custom traces.

... shown below with Custom1/Custom2/Custom3 selected for 'Smith' and 'log magnitude'

the top Expression line are fully individual...

Each custom trace can be given a Caption name

.. shown below with Expression 's_open' and Caption: 'open'



Then, by clicking any of 'short', 'open' or 'Load' words next to check boxes below plots, not the plot lines, then a dialog box appears with an option for 'Export Trace to s1p'

There are many other feature by right clicking around.

It is IMO a crazy user interface, perhaps if all were by right click instead of some by left double-click..

Anyway, s1p files exported, then can plot in gnuplot, revealing differences between open and short logmag

Hi Rune,

The new TDR impedance measurement is good too.

However it really could use the ability to manually scale the impedance in addition to the length, as the low impedance end of the scale is too compressed to read when used with typical coax in auto-scaling mode.

Regards,

Martin - G8JNJ

Hi Martin,
thanks for the bug report. I'll have a look at it (and probably a fix!) for
the next version :-)

--
Rune / 5Q5R

On Tue, 5 Nov 2019 at 12:56, Martin via Groups.Io <martin_ehrenfried=
[email protected]> wrote:

Hi Rune,

Thanks for the latest update, especially the ability to change the marker
size and the relabeling of the Series L & C values

One small bug I've noticed is that the Marker number on the S11 R+Jx graph
is incorrect, as it always shows as zero.

Regards,

Martin - G8JNJ

From: Rune Broberg

I just released NanoVNA-Saver 0.1.5:


[]
As ever, dear mailing list users, I very much look forward to your comments, feedback, suggestion and bug reports. I already have a number of things I want to try to get done for next week - so it shouldn't be a 2-week gap this time around! :-)

Thank you to all the testers who helped me fix the bugs in the first two alpha releases of this!
[]
==================================

Thanks Rune, working with the nanoVNA-F - current firmware. I particularly appreciate the TDR impedance plot addition.

73,
David GM8ARV
--
SatSignal Software - Quality software for you
Web:
Email: david-taylor@...
Twitter: @gm8arv

Hi Rune,

Thanks for the latest update, especially the ability to change the marker size and the relabeling of the Series L & C values

One small bug I've noticed is that the Marker number on the S11 R+Jx graph is incorrect, as it always shows as zero.

Regards,

Martin - G8JNJ

Hi Kurt -

Thanks for the additional hints, so essential success!

double click on any trace type name on the lower line

... which for the attached VNWA main window are 'Log Mag' or 'Smith'

the page come up with all the trace settings

.. which is titled 'Display Settings', also attached

another long drop down list S21, S11, S12, S22 and so on,
and here you find the 6 custom traces.

... shown below with Custom1/Custom2/Custom3 selected for 'Smith' and 'log magnitude'

the top Expression line are fully individual...
Each custom trace can be given a Caption name

.. shown below with Expression 's_open' and Caption: 'open'

Then, by clicking any of 'short', 'open' or 'Load' words next to check boxes below plots,
not the plot lines, then a dialog box appears with an option for 'Export Trace to s1p'

There are many other feature by right clicking around.

It is IMO a crazy user interface, perhaps if all were by right click instead of some by left double-click..
Anyway, s1p files exported, then can plot in gnuplot, revealing differences between open and short logmag

And here are the plots for the 3GHz VNA with the bridge rotated 180 degrees. Still without HW correction model.
All differences are coming from a change in bridge HW.

--
Erik, PD0EK

Free (in the USA) diodes available for battery indicator

I have 99 "extra" 1N4148WS diodes available.

If you want any, FOR FREE IN THE USA, send me a self-addressed stamped envelope and how many diodes you need. Email me for my address.
Roy K2RMA@...

Attached the plots you requested
All data from 3 VNA's calibrated with the same calibration kit measuring the same two cables

1: nanoVNA
2: ownVNA
3: 3GHzVNA

No VNA specific corrections applied

Top right is the smith chart plot of the calibration kit to prove the calibration was done correctly. I use "+" to plot the data otherwise it would be impossible to see the dot's as they are exactly on the same location and too small to see

The smith charts of the cables (bottom two) include the plot where the reference plane is set to the end of the cable (all VNA's with exactly the same shift per cable, labeled with "rotated") so you can easily see the remaining errors
And yes, some cables move outside the smith chart at higher frequencies and that is indeed the problem I try to solve with a VNA specific error correction approach


--
Erik, PD0EK

I just released NanoVNA-Saver 0.1.5:



Release notes:
This release, after a short break in the release schedule, offers a few new
features and improvements:

Configurable Markers
There are a number of new configuration options for markers:

The size of the markers can be changed under Display Setup,
Marker numbers can be displayed in the charts,
Marker data box headings can be coloured or not, depending on user
preference,
The data displayed for markers is now configurable
Impedance Analysis
The Time Domain Reflectometry window now has a display of an impedance
transform, showing the calculated impedance of the transmission line the
NanoVNA is looking at from the calibration plane onwards.

New analyses - and automatic running
The Analysis window has two new analysis options, peak search and VSWR
analysis. It also adds the option to run the analysis automatically
whenever new data is acquired, for example for adjusting filters.

Frequency display changed
DG5DBH kindly sent me updated functions to display frequencies on GitHub.
You can still enter frequencies in the manner you are used to, as Hz, kHz
or MHz, but now calculated or read frequencies should more consistently be
displayed in a nicely formatted way.


As ever, dear mailing list users, I very much look forward to your
comments, feedback, suggestion and bug reports. I already have a number of
things I want to try to get done for next week - so it shouldn't be a
2-week gap this time around! :-)

Thank you to all the testers who helped me fix the bugs in the first two
alpha releases of this!

--
Rune / 5Q5R

return loss gets poorer > 100MHz.

It looks better without USB connection.
Adding a ferrite core improved results with USB connection:

Hi Gabriel -

From those graphs it's obvious your calibration is way off because S11 exceeds
0dB (meaning outside of the smith chart) by quite a bit. If you plot the smith
chart you I'm guessing it will be all over the place, rather than making
circles around the center like it should. Please show the smith chart instead
next time because it's hard to see what's really going on with those graphs
(impedance is always a 2 dimensional quantity).

I guess you meant message 6456, and agree that was a poor choice of graphs.
I do not calibrate for such a wide range. So, second attempt:
Looking at logmag for CH0 and CH1 terminated by 50 Ohms
(AKA Isolation), then you will notice that return loss gets poorer > 100MHz.

Dear Hans,

many thanks for interesting and useful information. My initial suggestion
of a scheduled scan has exactly this purpose, to eliminate the influence of
cables or operator.

I think the RF on the USB cable wouldn't be an issue. The TX level of
NanoVNA is very low. Some ferrites can be added on the USB / UTP cable.
The UTP cable can be installed perpendicular to the antenna to minimize the
influence.

However, I'm still thinking the software solution, if possible to
implement, would be more elegant: a scheduled scan followed by a pause.

Andrew,
The support group for the NanoVNA-F that you own is located at /g/nanovna-f . You should leave a message on the board there ( /g/nanovna-f/messages ) and hopefully the developer of the NanoVNA-F will respond. The only documentation I was able to find was the same quick start guide you referred to at /g/nanovna-f/wiki/home . Hopefully over time the members of the nanovna-f group will start to produce better documentation for the NanoVNA-F. We went through similar lack of documentation when the NanoVNA was first marketed.

- Herb

So, it has been less than a month and my 4.3 inch long little wonder
arrived from Alixpress today. It had a Quick Start Guide lol. Are you
kidding me? It might as well be encrypted.

Has anyone come up with a video or true quick start guide for calibration
and basic antenna analysis?

Andrew
W1RNY

Andrew Baer, M.D.
301-355-9999

You may also need to add the try group to your user profil. I found that I needed to on RaspberryPi.
M Walter

Hi Oristo
In the help file search in index for "trace types" there all the various and very many trace types are described also custom traces. The trick is to double click on any trace type name e.g. Smith on the lower line, and that mean any of the trace name, and the page come up with all the trace settings, and in the six wide prompt line you decided what you want to have displayed form a long drop down list e.g. dB Smith, phase and so on. In the slim prompt line you decide to what the representation just chosen must belong to, from another long drop down list S21, S11, S12, S22 and so on, and here you find the 6 custom traces. Notice if using subexpressions all 6 custom traces share these subexpression, but the top Expression line are fully individual, and in most cases you can hold the entire expression in that line.
Each custom trace can be given a Caption name, which is shown along the custom traces in the lower trace line. Here is a refinement for all traces as a right click on the trace name, e.g. the custom trace caption name and on other traces e.g. S11, you get the option to save to s1p.
For a custom trace to open the trace settings window to e.g. change color, you mist double click on the trace representation e.g. dB, to the right for the caption name. If you double click on the caption name the Custom trace is opened.
There are many other feature by right clicking around.
If the help file will not open as an old fashion Windows help file, I have a little tool which in window 10 open up for the chm files.
Kind regards
Kurt

-----Oprindelig meddelelse-----
Fra: [email protected] <[email protected]> P? vegne af Oristo
Sendt: 4. november 2019 23:53
Til: [email protected]
Emne: [nanovna-users] VNWA software #calibration

If you have calibration data as impedance and delay, but want S11 s1p format, then VNWA software can generate it, according to Kurt Poulsen.

in the VNWA software you simply open a custom trace

I did not expect this "simply" to be so tricky. It appears that VNWA documentation >>never explains<< how to open a custom trace window.

Help has a section about what to do when already in custom sweep window, but getting there may be something that lucky folks are born already knowing...

Also, Frequency Range, under Settings, >>does not set Start and Stop<<, only Linear vs Log vs Listed...?

I guess this software may discourage many from purchasing the supported hardware.

The answers:
* right-click mouse button in the main window and select Trace Options,
which launches a dialog box titled 'Display Settings'
Custom is selected by scrolling down in small box next to color sample for Trace 1-6

* left double-click near Start or Stop frequencies will launch 'Input' dialog box
to set those frequency values. Sweep Mode is also selected here,
making Frequency Range option in main window Settings less than useful.

in the Expression line write s_load or s_open or s_short or
s_thrumatch or s_thru then the trace is shown according for the custom
trace to be shown as you like in Smith, dB of what ever representation
then to save directly as s1p file by a right click on the trace and use the "Export to s1p file" function.

Well, right-click on trace launches another dialog box, but no options for saving it

apparently "facupov" is pseudo for "from a common user's point of view",