Electronics > RF, Microwave, Ham Radio

NanoVNA Custom Software

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joeqsmith:
Reading up on the inverse chirp z-transform.


https://coppermountaintech.com/wp-content/uploads/2019/09/Time-Domain-Analysis.pdf

https://www.sbrt.org.br/sbrt2017/anais/1570359870.pdf

https://www.nature.com/articles/s41598-020-60878-7.pdf?proof=t

joeqsmith:
There is a new version now in the works.   Most of the changes are for the TDR measurements but I have added some other features as well. 

DC1MC:
What hardware variant/trusted seller do you recommend that gives the best results for the software, I've seen a (most likely fake clone of fake clone) NanoVNA of a friend that was frankly speaking a piece of junk, never producing 2 similar measurements in a row  |O.

So is there a trusted reliable seller somewhere, preferably in EU, best in DE, but wherever it is if it ships in DE is OK.

 Many thanks for your software,
 DC1MC

joeqsmith:

--- Quote from: DC1MC on October 12, 2021, 01:45:09 pm ---What hardware variant/trusted seller do you recommend that gives the best results for the software, I've seen a (most likely fake clone of fake clone) NanoVNA of a friend that was frankly speaking a piece of junk, never producing 2 similar measurements in a row  |O.

So is there a trusted reliable seller somewhere, preferably in EU, best in DE, but wherever it is if it ships in DE is OK.

 Many thanks for your software,
 DC1MC

--- End quote ---

I see that question posted a lot.  I really don't have a lot of experience with the different manufactures.  I bought the V2Plus and V2Plus4 directly from OWOs company.   The H4 appears to be well put together kit, but I have no idea who produced it.   I am also not sure where my friend bought the two original NanoVNAs. 

As far as making a recommendation on what to buy, it depends on how much you want to spend and how you plan to use it.  The firmware has been by far the biggest problem I have ran into. 

If you do not need narrow band measurements and plan to work above 300MHz, the V2Plus4 would be my pick out of the low cost VNAs.  If you want to work below 300MHz and need barrow band, or if you want to make PDN measurements, get the original NanoVNA.    If you need both, I would buy both products.
If you're the typical radio hobbyist and want to measure your antennas SWR out to three places beyond the decimal, stop kidding yourself and buy an SWR meter.

As far as your friends comment, its hard to say.  They would need to post some actual data, their setup.... before I could offer any input.    You read some of the things people post, like using a couple of VNAs and Ts to make full 2-port measurements  or connecting their VNA directly to their radios PA and you get the idea that many users are just starting to learn some basics.   I wouldn't look to them for advice.    (All actual posts BTW.  You can't make this stuff up.)

I've shown a lot of tests using these low cost VNAs  and have been pretty impressed with the data I have pulled from them.  Obviously working at higher frequencies will require more care to avoid measurement errors.    If your friend has a blog where they are posting their test results, provide a link and I will have a look at it. 

***

galileo:

--- Quote from: DC1MC on October 12, 2021, 01:45:09 pm ---What hardware variant/trusted seller do you recommend that gives the best results for the software, I've seen a (most likely fake clone of fake clone) NanoVNA of a friend that was frankly speaking a piece of junk, never producing 2 similar measurements in a row  |O.

So is there a trusted reliable seller somewhere, preferably in EU, best in DE, but wherever it is if it ships in DE is OK.

 Many thanks for your software,
 DC1MC

--- End quote ---

This is the manufacturer (Hugen) of Nano H and H4, TinySA etc: https://nanovna.com/?page_id=121
I would suggest that you get the H4 as it is a more capable device with standards that have been characterized (search for Kurt Poulsen's calibration data).

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