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If you turn on Transform and select Low Pass Impulse you are in "TDR mode". You need to set trace to "Real" and then you will see the difference between a short and an open.

Roger

On Wed, Jun 21, 2023 at 02:52 PM, Robert Rose wrote:

On Tue, Jun 11, 2019 at 07:52 PM, Frank S wrote:

Is there a way to tell what rev the firmware is?

HOME MENU->CONFIG->VERSION

Why necropost? Lots of current discussions in this group.

Roger

I should have said that type 43 reads like an open circuit .

--
*Gene Ruff*

All the units are based on the same hardware. This from "A Guide to the NanoVNA":
The current design of the NanoVNA and the name was created several years ago by a Japanese ham under the pseudonym “edy555”. His first design ideas with a different DDS (frequency generator) seem to date back to 2013, but the current design with a significantly reduced parts count and based on the Si5351A was published by him in 2016. Edy555 himself references a German kit, the VNWA3 which was based on the concept of using a cheap computer soundcard, published by Tom Baier, DG8SAQ in the Mar/Apr 2007 issue of QEX ("A Low Budget Vector Network Analyzer for AF to UHF"). In the summer of 2016, edy555 announced to produce the NanoVNA, which was apparently done afterwards, but the kits were predominantly sold in Japan. Edy555 was also involved in the original firmware and continues to support the firmware (see chapter Two). He decided to open-source hardware and firmware to avoid bad clones, which undoubtedly was key to future development and the current popularity of the NanoVNA. It was not until a Chinese ham, Gen Hu (pseudonym ''hugen'') adapted the design slightly by changing the power supply and started to mass market the NanoVNA, that the device created international interest. In agreement with Edy555, hugen sells his product under the name NanoVNA-H. Hugen also runs his version of the firmware.

Schw?rzler, Christoph; Schw?rzler, Maximilian. A guide to the NanoVNA (pp. 9-10). Kindle Edition.

Bob
KN6UXD

Google search: NanoVNA menu images

Bob
KN6UXD

On Tue, Jun 11, 2019 at 07:52 PM, Frank S wrote:

Is there a way to tell what rev the firmware is?

HOME MENU->CONFIG->VERSION

Bob
KN6UXD

This is a "where is Waldo" on the menu spider-web question. How do start a rescan after I change parameters? Is there an FAQ that beginners should read? A "NanoVNA for Dummies" book that you can recommend?

Thank you,
Bob
KN6UXD

I realize this is similar to a recent topic but a bit different.
As the "TDR" function in the nanovan is not actually a time-domain process, is there a wat to differentiate between a short or open fault in a cable?
I have previously built a generator which can produce a very short pulse or a step with fast risetime. I have used it in conjunction with a scope as a TDR. It works reasonable well and you can clearly see an open or short in a cable.
Is there a way to replicate tis with a nanovna?

a useful hint when identifying torrides type 31 has resistance across the
surface . type 43 has none. Different materials.

--
*Gene Ruff*

43 or 31 material are appropriate for HF applications. 43 is better for
20-meters upward and 31 material is best for 160 through 40 meters. If you
are sure you have 43 material, there really is no reason to test the
toroids.

Dave - W0LEV

--
Dave - W?LEV

Dears,

FT240-43 Torroid, Can I use my NanoVNA to meassure my several torroids to be sure that I have the correct ones for HF UNUN?

any info is welcome

73,
Kurt

On 21/06/2023 19:05, Fran?ois wrote:

** Ok but the files would be in a .zip it would happen all at once while keeping the structure
-- F1AMM Fran?ois

That is exactly what I do with my own software, but I then have to ask users not to overwrite and files they have personalise. You can't win!

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

Strange, yes, but personally I prefer it that way, so that you know exactly
what is being added to your computer rather than a massive install.exe with no
idea what it contains!

** Ok but the files would be in a .zip it would happen all at once while keeping the structure
--
F1AMM
Fran?ois

-----Message d'origine-----

De la part de David J Taylor
Envoyé : mercredi 21 juin 2023 17:23

On Wed, Jun 21, 2023 at 09:27 AM, Chris K2STP wrote:

Now there is a GREAT suggestion for the Nanovna, add a firmware update option
to the PC Saver program!! This way we have an “all in one” application to
use and manage the nano.

Use NanoVNA-App

On Wed, Jun 21, 2023 at 06:38 AM, David J Taylor wrote:

On 20/06/2023 06:07, Fran?ois wrote:

The program can also update the firmware.

Now there is a GREAT suggestion for the Nanovna, add a firmware update option to the PC Saver program!! This way we have an “all in one” application to use and manage the nano.


--
Regards,
Chris K2STP

On 21/06/2023 12:05, Fran?ois wrote:

Hello
Thank you for the link.
It's strange that we have to download file by file.
It's done, thank you
73
-- F1AMM

Strange, yes, but personally I prefer it that way, so that you know exactly what is being added to your computer rather than a massive install.exe with no idea what it contains!

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

On Mon, Jun 19, 2023 at 11:23 AM, RJOLLIS wrote:

if there was a short in the coax

Did you check it with an ohmmeter?
BTW, I noticed in the first picture that you're using/reading S21. Is that correct?
And "Transform" was set to "OFF". (but maybe you changed that after taking the picture)
--
Doug, K8RFT

Hello

Thank you for the link.
It's strange that we have to download file by file.

It's done, thank you
73
--
F1AMM
Fran?ois

De la part de David J Taylor
mercredi 21 juin 2023 12:39

The Nano's TDR function can show 'defect' location - even multiple "feature" locations. It shows distance in meters. You move the cursor to the "odd spot" in the trace, and read the distance to there. That works well, but the start and stop frequencies must be correct for the distance range that you want, and you must set the cable velocity factor.
There is a good video on using the nanovna to measure coax length, by W2AEW, on youtube. That method will also show any fault or discontinuity location (distance, in meters).
--
Doug, K8RFT

On 20/06/2023 06:07, Fran?ois wrote:

Hello
I have never used this kind of small spectrum analyzer TinySA
- I read that there are at least 2 software on PC (like nanoVNA-saver) which allow to connect the small box TinySA. I don't want to tear my eyes out too much on a screen that's too small.
- I don't see any "groups.io" discussing this topic. Did I search wrong?
-- F1AMM Fran?ois

Fran?ois,

Gyula has already pointed you to the group (thanks).

The newer and more capable TinySA Ultra has a "4-inch" screen which is adequate (for me) for many things, but there is a TinySA program for the PC which provides a bigger display. The best source of information is the Wiki, and the group, of course:



The TinySA App can also be downloaded from here:



The program can also update the firmware.

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