I recently bought a newer model Nanovna, the one with type "N" connectors and extended frequency range. I loaned it to a former co worker so he could check it out with his better quality equipment. After a week, I called to see what he thought. He said he didn't really check everything, but he thought it was worth the money I paid. He commented that the level measurement seemed very accurate, but he didn't check it over the whole frequency range. Then, he said the frequency was off by 5.6 MHz. I thought this was odd. I assumed that it used some kind of TCXO for its reference and might be off a few PPM, but 5.6 MHz at a pretty low frequency didn't sound right. So, I hooked it up to my trusty Racal 1992 counter, set it for CW frequency, 100 MHz. The counter just displayed random numbers. Surely this thing puts out enough to trigger my counter. So I select 10 MHz, and it displays more or less 10 MHz. I didn't note the exact frequency, but there were zeros after the decimal point. Good enough. I went back to 100 MHz, set the number of points to 1, it displayed 101 points. I set the number of points to zero and it displayed 2 points. Odd, I thought. Still no counter display. So, I connected to my spectrum analyzer and the frequency seemed to be all over the place. Actually, it didn't look like a single frequency jumping around, it looked like a bunch of rapidly shifting frequencies. No wonder the Racal couldn't lock up on it. Checked 10 MHz, same thing. Now, I am wondering if this thing will even be usable. Has anyone else with one of these seen the same thing? I doubt if there was even a warranty. I will do a cal and try measuring a few filters to see what I get.
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