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I accidently transmitted 12w into my connected nanovna and caused some damage to the software or components, not sure but it cannot read SWR any longer. It still uploads firmware etc but does not function as it did in the past.
Is it possible to replace the entire main board with a new board?
where can I get that replacement pls

I suspected as much. Best to have a known length of the cable to be measured. Then one can get the actual VF. Thanks, Stan.

Brian D
KF6BL

Roger:
Bingo!
I used the wrong .dfu.
Downloaded -H4 and I am back in business.
I owe you big time.
Thanks for all your help.
Fred
WD9HNU

On Mon, May 23, 2022 at 07:25 AM, Fred Piering wrote:

Fred,

Are you sure you are using the correct DFU file for the -H4? If you use the -H you will get a black screen.

You need to use the "Upgrade" button NOT "Upload". This is a common error. Check the "Verify after download" box and it will check that the firmware was written to flash correctly.

Roger

Hello Igor:
Thank you for the comprehensive video.
I performed the task as you showed, with the latest dfu file.
It appeared to function as your video showed.
However, I am still left with a black screen after disconnecting and reapplying power.
Fred

IMO, this would be stupidly cheap if it wasn't for the fact that the other nanoVNAs are so ridiculously cheap. Check the price of any way less capable graphical antenna analyzer for comparison. Even the archaic analog MFJ-259 is $350. Of course this is competing with those other amazingly capable ridiculous cheap nanoVNAs, so the question becomes are the features/benefits worth it to you.

On 23/05/2022 01:32, Roger Need via groups.io wrote:

Attached are some photos showing what you get in the box and what it looks like inside.

What I find disappointing is that it does not come with an N connector calibration kit. Inside it uses a SMA to N connector adapter and then an N Connector to SMA adapter and SMA cal loads are used. This is not great because the cal is now done through two adapters.

Roger,

Many thanks for your comments, links, and photos. I completely agree about the
calibration kit, although I'm more likely to be using it with SMA devices most
of the time. The dynamic range limitations aren't surprising, and even on a
professional VNA you are likely to need reduced bandwidth, slow scans, and
averaging to optimise the dynamic range.

Closed-source firmware and dedicated software is disappointing, but not a deal
killer for me, providing that bugs are fixed. Noted the ML&S reported
problems, but they are being addressed.

I appreciate your input.

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

On 22/05/2022 20:32, Chris Gardner via groups.io wrote:

Just a casual observation / opinion. The device looks to be rather expensive for typical ham use to me,
Unless of course you require testing capabilities in the 4.4 GHz ranges. The so called classic models
like the Nano VNA H4 operate up to about 1.5 GHz and are less than half the price. Other than that
I am not familiar with that particular device.

Chris,

Thanks for your comments. I agree about the price, although these days prices are always higher than expected! It was the large screen which attracted me, and I don't know of any other 7-inch models, and seeing the information Roger provided it does look well built

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

Attached are some photos showing what you get in the box and what it looks like inside.

What I find disappointing is that it does not come with an N connector calibration kit. Inside it uses a SMA to N connector adapter and then an N Connector to SMA adapter and SMA cal loads are used. This is not great because the cal is now done through two adapters.

On Sat, May 21, 2022 at 11:47 PM, David J Taylor wrote:

I see adverts for the SV4401A 4.4 GHz, 7-inch VNA from JNCRADIO, with N
connectors.





- Does anyone know anything further about this device?
- Has anyone bought one?
- What Windows software supports it?
- Where are the firmware updates to be found?

I have one on order, but I can return it if it's not good.

I see nothing in the group messages or the Wiki.

This is the latest product from SYSJOINT (one of the developers of the NanoVNA-F). There is a Chinese version and an English version and they are not compatible according to the manufacturer.

The Web sites describing the product are:
1.
2.

Specifications:


User manual:


Firmware is not open source and one vendor. ML&S UK, reports they have found some bugs which manufacturer is working on. >>

It connects to the PC with a SYSJOINT Version of NanoVNA Saver. Drivers for WIN 10 are not required. Win7 and WIN8 drivers can be downloaded from SYSJOINT.

Looks like it is well built but S11 and S21 dynamic range is something to take a look at.

Roger

WOW, you searched the internet... WOW, what a novel idea, would be cool if
others were to think of that...

AND put their name on their post...

John

A quick search on the internet yielded that it is a 75ohm-based VNA with a generator, like the NanoVNA. I also found a number of sites that had the manuals.

73
Evan
AC9TU

can anyone tell me what the WILTRON 6407 RF ANALYZER does,is it the same as a vna,or more,cheers.

Just a casual observation / opinion. The device looks to be rather expensive for typical ham use to me,
Unless of course you require testing capabilities in the 4.4 GHz ranges. The so called classic models
like the Nano VNA H4 operate up to about 1.5 GHz and are less than half the price. Other than that
I am not familiar with that particular device.

"or" is left in the question :)

How do you update or does your nanovna-H4 look like the attached video?


Link to get FW Hugen:

Well, Ollie, now you have done it.
I have the Tiny SA and NanoVNA-H4.
I have used them intermittently for some time, with the original firmware.
For some reason, I decided this weekend to update the firmware for both devices.
I used the Update instructions by K5DW, using the stm32cube program.
I started with the tinySA and following the directions, it updated perfectly.
Looking at other instructions for updating the NanoVNA, all were done in the dfu mode using the DfuSE software.
When I went to download it, ST Micro indicated it had been replaced with the 32cube software.
So, I used the 32cube program for the NanoVNA also.
I think my mistake was to use the .dfu file the first time instead of the .bin file.
In any case, now I have a black screen, and the computer will not recognize the usb connection, claims it failed last time.
Now I have been able to put the unit in the dfu mode by pressing the wheel while turning on, and the computer recognizes it.
I tried to install the .bin update and an earlier update to no avail using the 32cube software.
So I went to the DfuSE program and installed the .dfu file using that software.
I managed to get it connected and asked it to install the latest .dfu file, which it did (I think).
However, I still have the black screen and no usb in the normal mode.
Have I had it, and needing a new one, or is there some hope of salvation?
Any and all help greatly appreciated!
73
Fred
WD9HNU

On 2022-05-22 07:47:+0100, you wrote:

I see adverts for the SV4401A 4.4 GHz, 7-inch VNA from JNCRADIO, with N
connectors.

Connecting to it might be tricky "witch can be used to connect DUTs with SMA interfaces." ;-) Just gotta find that nearest coven, I guess.

~R~
72/73 de Rich NE1EE
The Dusty Key
On the banks of the Piscataqua

I see adverts for the SV4401A 4.4 GHz, 7-inch VNA from JNCRADIO, with N
connectors.





- Does anyone know anything further about this device?
- Has anyone bought one?
- What Windows software supports it?
- Where are the firmware updates to be found?

I have one on order, but I can return it if it's not good.

I see nothing in the group messages or the Wiki.

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

Just use the 'measure / cable' function from the menu; it should work
fine. It should report the impedance to be about 75ohm, and the length and
loss of the cable.
You do need to set the VF first. But note that true VF often varies by a
few percent from published design values, so you can only expect a length
measurement within a few percent.