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#86': UPGRADE : On the Results of Measuring Two-Ports Using Only [NanoVNA]
Channel [CH0] or a [LeastVNA].
-
#86: On the Results of Measuring Two-Ports Using Only [NanoVNA] Channel [CH0]:
16 December 2019 - /g/nanovna-users/message/8275

Hello,

Allow us, please, to announce that just we also additionally realized, in our sow,
the following simple facts, always facupov, of course, and thus we just upgraded
our previous division of the values involved in "Measuring Two-Ports Using Only
[NanoVNA] Channel [CH0]" and now : "or a [LeastVNA]", as follows:

- - - - - - (c) gin&pez@arg (cc-by-4.0) 2019 : start - - - - - -

(0) All values are expressed as (complex) (couples of) rational numbers of finite
length, but we can divide them to three 3 different sets, according to their different
origin, form, and precision :

(1) The set of nominal values of the three 3 Standards S, L, O, as they are given
by their manufacturer in the usual form of { -1, 0, +1 }. These numbers are exact.

(2) The set of 4 measured values : { s, l, o, g }, in the form provided by the
manufacturer of [NanoVNA], his current version of the updated firmware, or the
[LeastVNA] in use. These numbers are of fixed precision.

(3) The set of finally computed values, that is either the { S12S21, S22, G }
or just the {G} alone. The form of these numbers, as well as their precision,
which nowadays may be arbitrarily high and limited only by the available
application, computer memory, and run time, are defined by The Common User.

- - - end : (c) gin&pez@arg (cc-by-4.0) 2019 - - - - - - - - - -

Sincerely,

gin&pez@arg

:86'#

Using the matlab script from QRP I created a rough Octave script.

The script can send commands to the nanoVNA and read S11 and S21
Nothing special but it works.....

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

Is rf toolbox (or something equivalent) available for Octave?

Not really; Octave Forge has some signal processing


creatingrf [@] gmail.com has some RF support for Octave:

#86: On the Results of Measuring Two-Ports Using Only [NanoVNA] Channel [CH0]

Hello,

Allow us, please, to announce that, in the process of preparing the presentation
of our results on Measuring Two-Ports Using Only [NanoVNA] Channel [CH0]
and regarding the values involved, we just realized in our sow the following
simple facts - always facupov, of course, as usual :

- - - - - - (c) gin&pez@arg (cc-by-4.0) 2019 : start - - - - - -

(0) All values are expressed as rational numbers of finite length, but we can
divide them to three 3 different sets of different origin and different accuracy:

(1) The set of nominal values of the three 3 Standards S, L, O, as they are
given by their manufacturers : { -1, 0, +1 }. These numbers are exact.

(2) The set of 4 measured values : { s, l, o, g }, as they are provided by
[NanoVNA] in use. These numbers are of fixed accuracy.

(3) The sets of finally computed values : either { S12S21, S22, G } or {G}.
Nowadays, these numbers may are of arbitrary accuracy defined by The
Common User.

- - - end : (c) gin&pez@arg (cc-by-4.0) 2019 - - - - - - - - - -

Sincerely,

gin&pez@arg

:86#

I have the Octave interface to nanoVNA working and wanted to work with the data
All Matlab code I can find uses rf toolbox
Is rf toolbox (or something equivalent) available for Octave?
--
NanoVNA Wiki: /g/nanovna-users/wiki/home
NanoVNA Files: /g/nanovna-users/files
Erik, PD0EK

Hi Alan,

I did some modelling and there are quite a few places where errors can creep in. I was a little surprised on the significance of Tx driver source impedance and balanced Rx output loading impedance have. It will take more analysis to understand what can be calibrated out.

The excitation driving source impedance has a resistor attenuator pad to improve the source impedance control but a compromise must be made on the tolerable drive signal loss. The capacitance of the synthesizer driver output and input of the SA612 effect high frequency end.

The sophistication of the calibration correction algorithm may be an area to examine as the correction algorithm for low Z measurements can be different from high Z measurement. How you might interpolate calibration points may depend on what is creating the errors, resistor matching, absolute resistor values, and/or stray reactance. At low freq end stray reactance effects are minimal but may have to begin to worry about spurious mixing products not being attenuated enough by LPF effecting ADC readings.

But this is a low cost 'hobbyist' unit. I would like to see a better synthesizer IC and mixer IC but that would run up cost. I have a NanoVNA, NavoVNA-F, and N1201SA unit. I like the N1201SA with its better AD4351 synthesizer chip and high frequency capability but it is limited on low freq end and doesn't seem to have open source code available. My N1201SA was built with AD4351 chip which could go down to 35 MHz but firmware stops it at 137.5 MHz as if it has the AD4350 chip. I would definitely go for the extra bucks of the NanoVNA-F over the original NanoVNA. The -F has 5v boosted supply for mixers where the original NanoVNA runs directly from 5v USB that drops to LiIon battery voltage when USB supply ls not connected. The -F also has the more powerful M3 processor and extra flash memory along with several other improvements including a real housing.

Hi Allison
Sure they will work fien with thee NanoVNA as the difference in offset delay is very small as the NanoVNA is designed for ideal calibration kit except the open is compensated by 50fF. But you are not calibrating to the calibration plane of the Female adaptor of the NanoVNA or the Male adaptor at the end of the test cable if using a such. However the Display/Scale/Electrical delay in the NanoVNA can fix it if you enter the offset delay of the male versus female short.
Kind regards
Kurt
-----Oprindelig meddelelse-----
Fra: [email protected] <[email protected]> P? vegne af aparent1/kb1gmx
Sendt: 16. december 2019 02:29
Til: [email protected]
Emne: Re: [nanovna-users] Homebrew Female SMA standards and T-Check

One last, many of the HP loads are air, the most often home made open and short are PTFE loaded, there is a VF difference.

The HP load is definately air (minimal dielectric) to the resistance.
The open and short are for my set air.

I have them to calibrate the HP4191A I have and work well for the nanovna.

Allison
--
-----------------
I do not accept private email due to forum scraping groups.io

Hugen,

What will be the price of the new version? And when it comes out, will the older version still be available?

BruceN, K4TQL

--
*"To invent, you need a good imagination and a pile of junk"* -- Thomas Alva Edison (1847-1931)

Hi Rudi,

The MATLAB T-check script is part of a package of scripts written by Dick Benson, W1QG, and downloadable from the Matlab Central:



Please note that it requires MATLAB's "RF Toolbox", so I do not know if it is compatible with Octave. Give it a try, maybe it will work.

And note that the T-check script works with an S2P file.

Best of luck!

- Jeff, k6jca

Allison, Dave, and Kurt, many thanks for your replies.

Dave -- thank you very much for the "flush thru" description. That explains a lot, and it was a key bit of info that I lacked.

Kurt -- I'll attempt some accurate characterization when I return home (I am "on the road" at the moment). I found some APC-7 terminated airline in the back of a drawer a few days ago, so that should help me characterize C0. Thanks very much for your advice.

Allison -- I am intrigued as to how you are using your 4191A. I have one, too, but I've been using it with the stock fixture. Am I correct in assuming your are adapting its APC-7 to an SMA cable, and then making your measurements at the end of that cable? And where are you defining your reference plane?

Again, thanks to all.

- Jeff, k6jca

I would like to thank all the replies to my initial message. Unfortunatelly, the firmware was an old one that didn't allow me to go into a config menu. I also made sure to jumper the boot0 and Vcc.

In the meantime, I had a great assistance from Igor, PY3IG, who told me to install the proper Win10 driver. Once done, everything else went smoothly. My hats off to Igor for his assistance and Youtube videos.

73,

Luciano PT9KK

Windows 10 has the drivers on board, not necessary to run Zadig. The device should show up under "Ports (Com? & LPT)" as "Serial USB Device (COM3)" eg ,? NOT under "Serial Bus-Controllers". if so DELETE the drivers there. Then connect the device to an USB port, the drivers will be installed on the right place automatically. Then run DFUse to flash the firmware.

Success

Jos


Op 15-12-2019 om 23:06 schreef Luciano Gasparini:

Hi Oscar,

Use it and don't worry about being a clone or not a clone.
If Hugen hadn't cloned from edy555, you wouldn't have to worry now.
By the way, everyone works from a set, if there is a difference, it is revenge of the scrap.

73, Gyula, HA3HZ

Hi Luciano,

You are writing that there was no D2 diode, which is likely to give you an earlier firmware version of nanoVNA.
Therefore, ignore the "Menu -> Config -> DFU" message as you do not have it in the firmware yet.
Download USBDeview (92kB) to see which USB drivers have been installed on your machine since your operating system was installed, and a green circle at the beginning of this line indicates what is in use.
For the DFU (Device Firmware Upgrade) to work properly, you need the en.stsw-stm32080.zip file, which contains the installation program and the driver needed to detect nanoVNA. Download and install it after a short registration. Then short-circuit the VDD and BOOT0 points of the P1 connector and insert the USB plug into the PC. NanoVNA with white screen indicates that it is in DFU mode. If your machine really sees nanoVNA, you can use DfuSe to update the firmware.
If the above process does not work, you will need to extract a ST-Link v2 dongle that you can use with en.stsw-stm32102.zip. I do not write down the details because can read to the forum many times. Use the "Search" button with short sentences.
Note that for the first time I only succeeded with the ST-Link v2 dongle.
I wish you a successful update.

73, Gyula HA3HZ

Hello Jeff,

You have made an interesting T-Check measurement in post 8236, date 2015-12-15 16:19.

Is your MATLAB script "Cal_T_Check.m" also usable with Octave under Linux?

73, Rudi DL5FA

Hi Hugen,

I recently purchased my from ALI Express.

I am totally new to the VNA.

How can one identify if it is a clone or not.

Regards

Oscar

On Mon, Dec 16, 2019 at 03:56 PM, Ady, YO2NAA wrote:

Dear Hugen,

that's good news. I would recommend the store to my friends. We appreciate
your work.
I see that shipping is 15$ for my country (Romania), also for some EU
countries, but for other EU countries shipping is free.
Is there a way we can order with free shipping?

Thank you and best regards,
Adrian

You can contact Maggie to modify, Maggie will choose the appropriate courier, most European countries do not need to add additional postage.

hugen

Greetings,

I am unable to complete the checkout process with two different credit cards. Do you take Paypal?

Dave W6TE

Dear Hugen,

that's good news. I would recommend the store to my friends. We appreciate
your work.
I see that shipping is 15$ for my country (Romania), also for some EU
countries, but for other EU countries shipping is free.
Is there a way we can order with free shipping?

Thank you and best regards,
Adrian

I have made these changes, but I always get an error interrupt. It may be caused by some register values not being reset properly.

hugen