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.
Hello everyone! My NanoVNA's smith circle always shows ellipses and cannot be corrected by cailberation. Certainly that my caliberation option is correct. When I connect to PC,the viewer shows the same situation. Now I wonder that one or some components in it is broken? if its,which component should I replace? The version is V2_2 and I attached pic(just cable and vna.nothing else attached) follow. Thank U again for tap in and give me an answer! ! !
With a cable attached, I get similar results. A cable is not amorphic. You are looking at it over a wide freq range which is why it is going in circles.
Disconnect everything.
If you want to see, what is on the end of the cable, you have to calibrate at this plane. Try to put a picture when you put short on the end of the cable. I suppose there are multiple discontinuities (adapters or similar). Try to look at TDR and you should see, in which distance the disturbances are.
OK1VAW, Vojtech.
ThankU for answer,I've tested a same filter ,and the S parameter performance tend to be totally different between my desktop and NanoVNA shows.the later just cannt be figure out cause the serrated S11 and S21 line, pics are follows.
ThankU for answer,I've tested a same filter ,and the S parameter performance tend to be totally different between my desktop and NanoVNA shows.the later just cannt be figure out cause the serrated S11 and S21 line, pics are follows.
The image in your first post looks like there may be some damage to the
rf switch U551 (mxd8641) or the baluns. Check for broken wires on the
balun and maybe try replacing U551. The circles should look a bit more
round.
On 06/01/2021 20:23, 13515474300@163.com wrote:
Roger that . I'll try to replace it . SO APPRECIATE ！！
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