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Nano VNA like sand on the sea- Who is the "good one" ?

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pdenisowski:

--- Quote from: Aldo22 on July 10, 2024, 12:07:50 pm ---The 2.8" model fits easily in your pocket and if you need it more convenient, there is the PC software.

--- End quote ---

If I'm putting my NanoVNA in my pocket (so to speak), I'm probably using it outdoors to do things like antenna and cable testing, and this is where a larger unit, better controls, and a nicer screen make a big difference.  I would gladly buy yet another NanoVNA if someone would package it with better controls and a much larger/brighter screen.

Martin72:

--- Quote ---The 2.8" model fits easily in your pocket and if you need it more convenient, there is the PC software.[/quote

Some of the models are dramatically cheaper and that can't just be down to the smaller screen, can it?
--- End quote ---

Aldo22:

--- Quote from: Martin72 on July 10, 2024, 12:23:08 pm ---Some of the models are dramatically cheaper and that can't just be down to the smaller screen, can it?

--- End quote ---

You said:

--- Quote from: Martin72 on July 09, 2024, 09:17:07 pm ---I just want to play around with a VNA and a cheap Nano VNA seems to be the perfect solution.

--- End quote ---

That sounds like the 50€ version to me.  ;)
If you need more range/bandwidth or a bigger screen, then compare the specs and buy the one that fits.

I already said that in my first answer:
There are different screen sizes and bandwidths etc.
I don't know if there is the one "good one".

More is usually better... and more expensive.

bingo600:
Martin i'd buy from eleshop.eu or eleshop.nl (eu shows prices wo VAT) - eleshop is authorized reseller.

I'd also get a litevna64, if you need to play with freq's over 300MHz
https://www.eleshop.nl/litevna-64.html

Or you could start with a H4' , if Freq under 300MHz - But "Murphy" says in 2 weeks you want to check your 433MHz or WiFi antenna ....
https://www.eleshop.nl/nanovna-h4.html

But if you go cheap (H4) - Then once you grow out of your H4' , and get a litevna64  ;)
You can reprogram the H4 as a TinyPFA , and play w. phase analysis of Xtals or GPSDO's

Don't get the NanovnaH - The F072 MCU is too weak.

I have a H4, a litevna64 , a V2Plus4  - But usually reach for the litevna64.
I also have the TinySA Ultra - Cute little tool at the right price.
 
Ps: The litevna64 battery draining issue that i have, should be fixed in the newer verions.


/Bingo

joeqsmith:
Its not just a matter of upper frequency.  The LiteVNA's narrow band performance is really poor.  The original NanoVNA will far out perform it in that case.   If you attempt to measure power distribution networks, again the original NanoVNA will out perform the Lite.  They are so cheap, you can spend $250 and have both.   

I am not aware of any 1.5GHz units.  You can certainly use harmonic with the original NanoVNA / H4 that will allow you work up that high but the performance is really poor.  Not to mention other problems it can cause.

I always use the PC so the screen size and other options really are not important.   That said, the original NanoVNA & H4 use a different protocol than the LiteVNA.   If using them with a PC is important, make sure that what ever software you plan to use supports the VNA (before you buy). 

***
Should mention that the LiteVNA64 also supports harmonics.   Attached comparing the floor of my LiteVNA64 compared with my Agilent PNA.   You can operate the LiteVNA64 even higher but as you can see, the performance is poor. 

Also, people will ask if their XXXXXXX brand/name cheap VNA will work with my software.  I have a version that supports the older protocol.  The firmware installed in these makes a big difference on how stable they are.  I abandoned that project some time ago and now only support the LiteVNA64.   There is also the V2Plus4 that supports the newer protocol.  It will work with my software but because the firmware, it has fallen far behind.  I have not used mine since I bought the LiteVNA64.

The LiteVNA64 also has a new version of hardware.  This new version improves the dynamic range a small amount but also appears to have a problem where the frequency is not stable.   It doesn't appear to be firmware related but rather the hardware.  The frequency seems to dip 50Hz from time to time.  Both of my older revisions to not exhibit this problem.  Just something to be aware of. 

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