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...
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Sorry to hear that. Still a pain, Rudi, but better to destroy a $80 (or whatever) device than a $8000 one!
Cheers,
David
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David J Taylor