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Siegfried Jackstien - do you have a link to the firmware and that software?? The only version of software i see is 2.09

Thanks

i had both found in the nanovna beta test group

dislord uploaded it there (to make it easy for you i add the fw file for the plus4)

and the nano vna app??

you find here



hope that helps you a bit

dg9bfc sigi



Am 24.08.2022 um 19:09 schrieb GMRS_two_way_radio via groups.io:

Thank-you and I also applied to be part of the beta group but still waiting.

I got my in May, so I wonder if I have the "old" display. I guess my other question is if I have the newer display module and I install firmware that is for the older display modual what will happen to my display? If it don't work right I don't care because I will be using the software I can re-flash it back if I need the display to work right.

What is the best way to back up my firmware that I have on my nanoVNA?

Thanks

Why are you trying to calibrate it using the computer?
You can perform the calibration using the builtin calibration functions that use the three provided plugs (open, short & 50 ohm)

73
David

I thought I read somewhere it should be calibrated using the software if a person is going to be using the software for measurements

Calibration of any VNA is necessary.? You have to use the open'/short/50Ohm plugs along with your adaptor cable to calibrate the VNA "system".
So the proper sequence for any VNA is:
#1 Calibrate VNA with adaptor cable (i.e. any cable that is NOT part of your antenna system) using open/short/50Ohm#2 Measure/tune antenna (not the coax from your rig).? This will be your VNA + adaptor cable plugged directly into the antenna with no chokes or anything in between.#3 Tune your antenna to get 0 reactance and ideally 50Ohms.? But whatever 0 reactance point you have that is the resistance you need to match.? You can usually get below VSWR 2.0 with standard BALUNS of 2X, 4X, 8X, 16X if needed but it's much better to tune the antenna to 50 ohms if you canNote that you can get 0 reactance at multiple points -- especially on 6M and higher.#4 Measure your coax using the the 50Ohm terminator on the antenna side and ensure you have 50 Ohms and 0 reactance...or real close to that.? Also use the TDR to ensure no breaks in the coax (pretty rare).? You do need to know the velocity factor of your coax in order to use the distance calculation in the VNA TDR.#5 Measure the complete coax/antenna system.? Should look very close to the same as it did at the antenna.#6 Add a 1/8th section of coax? to the system and measure again....if there is no common mode the measurement will be very close to #5.? There should be no common mode if the antenna is 50Ohms and 0 reactance.? If the antenna is not 50Ohms (or not matched to 50Ohms) and/or has reactance than extra coax will change the tuned frequency and resistance....this is why you can't really tune at the rig if your system isn't matched near perfectly.? Common mode will modify the VSWR measurement.
Note that nowhere? above do we talk about minimum VSWR -- that's not the goal.? 50Ohm and 0 reactance is minimum VSWR.? Problem is we are rarely exactly on 50/0. And some antennas can never get there without a lot of monkeying around with custom BALUNs and matching networks.? So always measure your antenna system, coax, system, system+1/8th in that order.


Mike W9MDB

Again without the HTML formatting.


Calibration of any VNA is necessary.? You have to use the open'/short/50Ohm plugs along with your adaptor cable to calibrate the VNA "system".

So the proper sequence for any VNA is:

#1 Calibrate VNA with adaptor cable (i.e. any cable that is NOT part of your antenna system) using open/short/50Ohm
#2 Measure/tune antenna (not the coax from your rig).? This will be your VNA + adaptor cable plugged directly into the antenna with no chokes or anything in between.
#3 Tune your antenna to get 0 reactance and ideally 50Ohms.? But whatever 0 reactance point you have that is the resistance you need to match.? You can usually get below VSWR 2.0 with standard BALUNS of 2X, 4X, 8X, 16X if needed but it's much better to tune the antenna to 50 ohms if you can
Note that you can get 0 reactance at multiple points -- especially on 6M and higher.
#4 Measure your coax using the the 50Ohm terminator on the antenna side and ensure you have 50 Ohms and 0 reactance...or real close to that.? Also use the TDR to ensure no breaks in the coax (pretty rare).? You do need to know the velocity factor of your coax in order to use the distance calculation in the VNA TDR.
#5 Measure the complete coax/antenna system.? Should look very close to the same as it did at the antenna.
#6 Add a 1/8th section of coax? to the system and measure again....if there is no common mode the measurement will be very close to #5.? There should be no common mode if the antenna is 50Ohms and 0 reactance.? If the antenna is not 50Ohms (or not matched to 50Ohms) and/or has reactance than extra coax will change the tuned frequency and resistance....this is why you can't really tune at the rig if your system isn't matched near perfectly.? Common mode will modify the VSWR measurement.

Note that nowhere? above do we talk about minimum VSWR -- that's not the goal.? 50Ohm and 0 reactance is minimum VSWR.? Problem is we are rarely exactly on 50/0. And some antennas can never get there without a lot of monkeying around with custom BALUNs and matching networks.? So always measure your antenna system, coax, system, system+1/8th in that order.



Mike W9MDB

Does anyone know how to back up the firmware? I want to back my up before I flash

Thanks

Use ST-Link programmer, see /g/nanovna-beta-test/message/3109
Part dump firmware.

Most easy see current version on version screen, and just download current firmware from official page:

For V2Plus4 exist 2 versions:
20220814 - only for last devices
20211227 - only for old?

Ohh, I need hardware too? And it's only part of the firmware?

My has firmware version 20220301 if that tells you anything?

I do not track the development of these devices, the developer asked to leave support. Therefore, it is better to ask him on the site
/g/NanoVNAV2

Firmware for the device that I have posted, but later their hardware changed (or the display connection, I don’t know), so you should still ask the official manufacturer about any device support.
But knowing his attitude, I don’t think that anything will come of it (it is for this reason that NanoVNA-App does not support the exchange protocol, the developer did not want to fix some of the nuances in the exchange, saying that these are software problems)

Ok that's is good to know i will ask them. you was saying about the display unit could be newer, what would happen if i load your firmware onto a "new" display model? if by doing that the display has issues that is ok cause i would be using the app for measuring and i could flash it back to the stock firmware if i need to.

hummm maybe i am missing something it won't let me join that forum :(

As i know all (but not LCD module) work, you always can load last firmware from official page for restore.

ya, that's what I am thinking to, I can load stock firmware back if you need. I did post in other forum too.

I can use the nanovna.app to load firmware it does detect when it's in DFU mode, so I would think it's ok for that?

I was just thinking if by loading that firmeware and the LCD don't work then it would be hard to get unit into DFU mode? unless there is a way with using the buttons?

You found menu 'enter in DFU mode' on V2Plus4 device? Or no?
For enter in Bootload mode (used in device CPU not have DFU mode, it use bootloader) need hold right button (if connectors up) and power on device

PS be careful on use ST-Link programmer for write firmware (use only QT or NanoVNA-App), at start adress written bootloader, this boodloader use CPU unique ID for run, and if damage it you brick device.

Yes I found it in the menu, and when doing the hold right button the display won't say DFU mode just a white blank screen correct?

I won't be doing the ST-link programmer way :( I was hoping there was a way with just software like is done when flashing

I can use the nanovna.app for flashing, correct?

On LiteVNA (or V2 modded by SD card + my fw) possible dump firmware to card from Expert Settings.
For V2Plus4 only if use ST-link.

After hold button and power on, you see only black screen, but on NanoVNA-App or QT connect to device it ask about flash firmware.
After complete possible need power off and power on device.

Ok I am going to give it a try I will flash using nanovna.app (I won't be able to save what I got on the unit now) your firmware that was post a few messages back, and I will use your modded software hopefully then the nanovna.app will work! If not or if I need my display to work, I will re-flash (enter DFU mode using the button way cause the display won't work) with the newest firmware version that is listed on the website.

This is the plan!

Thanks so very much for the help!

ohh i am waiting to hear back about this problem on the other forum just a fyi.