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Herb,

Thanks for all of your suggestions!

I wish that I had access to a calibrated microwave signal generator like I did when I was involved in teaching and research at the University of Kansas and the University of Missouri-Rolla (now Missouri University of Science and Technology), but the only signal generator in my possession now is a Siglent instrument that has not been calibrated for at least a couple of years. The maximum frequency of the Siglent is only 60 MHz and the two TinySA Ultras agree within 0.3 dB at that frequency. The designer of the synthesizer is going to check the power output of the device that I returned to him with with his HP service Monitor and an HP power meter at various frequencies. I have asked him to get back to me with the results.

I may still try to play a bit with the calibration table as I can always restore the original settings. I sincerely appreciate the information that you provided to me on the procedure necessary to adjust the calibration table.
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