It does appear that the cable is somehow involved.? Be all that as it may, my problems are not stopping me from getting good use out of the units.? I am repeatedly amazed at the accuracy and versatility it offers.? If careful I can make measurements to better than 1%.
The main lack for me is its inability to measure at audio frequencies.? No big deal; I have fancy gear for that.
I am tempted to buy a couple more just so I have redundancy big time.
Bob
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On Wednesday, December 18, 2019, 07:34:24 PM PST, Bob Albert via Groups.Io <bob91343@...> wrote:
Update.? I recalibrated and now the Smith display is okay.? Maybe I goofed and mixed up the calibration fixtures.
Both units have a problem where they turn themselves off without provocation.? Sometimes in the middle of a measurement.? One unit already has had the power control IC replaced.? Batteries are fine.
The one still won't go above 900 MHz.
Bob
? ? On Wednesday, December 18, 2019, 06:16:58 PM PST, Bob Albert via Groups.Io <bob91343@...> wrote:
I have two nanoVNAs each with a different problem.
One refuses to accept any frequency above 900 MHz.? I think I have had that aspect working before but now am not so sure.
The other gives me a bad display on Smith chart, with the open circuit near the middle rather than at the left.? This one for sure worked fine before.
Is there some kind of basic reset that can restore operation on the second one, at least?? The usual menu option RESET doesn't do it.
