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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Help needed. Strange behavior of SSA V2.2

SA5NTK 2021/06/07 08:35

Hello Everybody,

My first post on this forum.

The other day, while measuring/tuning my newly built antenna, the battery went on blink. After recharging, and for good measure connecting to a battery brick, my NanoVNA started to behave funny:
The curves would not update properly. It looked like only every 10th point of the curve was updating. I am talking about S11 and SWR.
If I reset by switching Off/On the curves are drawn OK. Same thing when i Recall a calibration setting First draw is good and then again only partly update.
If, for example I switch it on with open Port 1 and then connect a 50 ohm load both the S11 and SWR look like a comb with the teeth pointing down.
Re-calibrating and re-flushing the firmware didn't help.

Is this a known behavior? Can something be done to fix that?
Thanks!
73 SA5NTK

DiSlord 2021/06/09 14:34

try disable ecal mode
STIMULUS->CFG SWEEP-> NO ECAL

SA5NTK 2021/06/11 03:06

Thanks for reply DiSlord!

Unfortunately, selecting NO ECAL didn't help :(
And worse - the traces stopped updating all together ECAL or NO ECAL. That is, I can get something that looks like a plausible traces only after initial turn ON or resetting by OFF/ON

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