Karl Jan,
My SAA-2N measures about -12dBm at 8MHz CW, but the signal pulses on and off during the sweep. (It is -12dBm during the on times, measured with an HP8563E SA.)
I am using the Ojisan version of the SAA-2 firmware.
--John Gord
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On Thu, Oct 14, 2021 at 10:38 AM, Karl Jan Skontorp wrote:
I'm still struggling with my faulty nanoVNA SAA-2N :-( In addition to the
SAA-2N I have got a nanoVNA-F, a nanoVNA-H4 and a small "very tiny...". The
other units are working ok, but I really want to get my SAA-2N back in
business! Today I tested the S21 measurements with the SAA-2N. I measured a
18MHz bandpass filter, and the unit seems to work ok in this mode :-)
The next thing I wanted to check was the level of the "output signal" on Port
0. I also have a handy spectrum analyzer, the tinySA. I put the SAA-2N in "CW
mode" at a frequency of 8MHz. Connected the tinySA and observed a lot of
harmonics, but the "main peak" was at about -23dBm!!! I think this level is
too low! I did the same measurement on the H4 - result -8dBm and the
nanoVNA-F had +3dBm. The result on the "very tiny..." was -7dBm.
When putting this together, I my first thought was the Si5351, but when I have
done the rest of the measurements, I think one of the RF-switches, MXD8641,
must be broken. Can someone please tell me if my assumptions correct?
Will be grateful for any response!
Karl Jan - LA3FY
