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USB connection failed

Rudolf Schaffer All Messages By This Member #14426 Hello, Since this morning, my NanoVNA-H don't accept the USB connection. I tried on 3 different PCs, no success. On battery, all is ok but i'm not able to do charging. I suspect an USB interface failure but i'm not sure... What can i do ? Thank you for your help. Rudi
David J Taylor All Messages By This Member #14427 Hello, Since this morning, my NanoVNA-H don't accept the USB connection. I tried on 3 different PCs, no success. On battery, all is ok but i'm not able to do charging. I suspect an USB interface failure but i'm not sure... What can i do ? Thank you for your help. Rudi ==================================== Let's hope it's just dust or dirt in the connector, perhaps remove with a brush. Or, the connector may have broken off the board enough to have dropped one connection - physical problem rather than anything more complicated. Tale a look. Cheers, David -- SatSignal Software - Quality software for you Web: Email: david-taylor@... Twitter: @gm8arv
Helmut Wabnig All Messages By This Member #14428 On Fri, 19 Jun 2020 10:00:27 +0200, you wrote: Hello, Since this morning, my NanoVNA-H don't accept the USB connection. I tried on 3 different PCs, no success. On battery, all is ok but i'm not able to do charging. I suspect an USB interface failure but i'm not sure... What can i do ? Thank you for your help. Rudi Why don't you look into the Device Manager. W.
Richard Simmer II All Messages By This Member #14436 Have you tried a different USB cable?
Rudolf Schaffer All Messages By This Member #14437 Hi David, Thank you for your answer. In between, i found the "problem". The USB port was connected to a battery powered PC. The NanoVNA's CH0 port was connected to a grounded frequency meter,? powered by the main. After a main power fail, a fatal overvoltage arrived and the NanoVNA's USB interface was killed. Results, no more USB connection; no red line active and no battery charging possible. May be, a better USB protection would be required...but for the price... Regards, Rudi PS I ordered a NanoVNA-H4 and i will take it totally disconnected when not in use... toggle quoted message Show quoted text Le 19.06.2020 à 10:36, David J Taylor via groups.io a écrit?: Hello, Since this morning, my NanoVNA-H don't accept the USB connection. I tried on 3 different PCs, no success. On battery, all is ok but i'm not able to do charging. I suspect an USB interface failure but i'm not sure... What can i do ? Thank you for your help. Rudi ==================================== Let's hope it's just dust or dirt in the connector, perhaps remove with a brush.? Or, the connector may have broken off the board enough to have dropped one connection - physical problem rather than anything more complicated.? Tale a look. Cheers, David
David J Taylor All Messages By This Member #14438 Hi David, Thank you for your answer. In between, i found the "problem". The USB port was connected to a battery powered PC. The NanoVNA's CH0 port was connected to a grounded frequency meter, powered by the main. After a main power fail, a fatal overvoltage arrived and the NanoVNA's USB interface was killed. Results, no more USB connection; no red line active and no battery charging possible. May be, a better USB protection would be required...but for the price... Regards, Rudi PS I ordered a NanoVNA-H4 and i will take it totally disconnected when not in use... ===================================== Sorry to hear that. Still a pain, Rudi, but better to destroy a $80 (or whatever) device than a $8000 one! Cheers, David -- SatSignal Software - Quality software for you Web: Email: david-taylor@... Twitter: @gm8arv

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