Beware of cheap underperforming clones

As of 2022 there are many badly performing clones on the market. V2/3GHz NanoVNA uses parts like ADF4350 and AD8342 which are costly and clones have been cutting costs by using salvaged or reject parts.

See official store and look for V2 Plus4/V2 Plus4 Pro versions only to avoid getting a bad clone. We have stopped selling V2.2 versions since October 2020, so all V2 hardware that are not Plus or Plus4 are not made by us and we can not guarantee performance.

NanoVNA V2 Forum

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NanoVNA V2: What means "coherent bandwidth" ?

Bobinuta Bobinel 2021/07/03 10:27

Hi all,
Looking at the specifications from the FAQ ( https://nanorfe.com/nanovna-v2-faq.html ) and at the OwO posts that is quoting them ( https://groups.io/g/NanoVNAV2/message/2062 ) , I see a term that I cannot understand : " *coherent bandwidth* ".
" Additionally, the V2 is not suited to very narrowband measurements ( *coherent bandwidth <1kHz* ) "
So I make a call to OwO (as an official maintainer) or to anyone else - please explain a little bit to me that term - "coherent bandwidth".
Of course, while we are talking about a filter!
I mention that I read what Wikipedia says about "coherence bandwidth" - but there is about a channel / cellular communication path and my knowledge doesn't allow me to translate that explanation to a filter.

Thanks a lot and have a nice week-end,
Bob

OwO 2021/07/04 00:38

The bandwidth over which the DUT's gain changes significantly. So in other words the frequency resolution should be treated as >1kHz.

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