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On Tue, Dec 15, 2020 at 04:28 PM, Tony Dudieron wrote:

• Being that what I would be most interested in at the "power meter" TinySA is any difference in signal power between the directly connected reference state and the cable-under-test state, would the +/- 1dB accuracy limitation still apply? I ask this only because in my experience some test equipment does much better at measuring small changes in power than they do in measuring absolute power levels.
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The minimum resolution of the tinySA level meter is 0.5dB, so yes, it is better than +/- 1dB. but impossible to see any delta below 0.5dB

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• In your opinion, will the 50 - 75 ohm impedance mismatch be an issue with the two-TinySA approach? Should I consider using impedance matching pads, in spite of their 5.7 dB loss?? And if so, should it be used at both the signal generator and the "power meter" TinySA?
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Best is to do both (with and without matching pads) and if they do not give the same cable loss? do believe those with the matching pads. The tinySA in its high output mode has sufficient output power to cater for the 10dB or so loss of the matching pads. And measure at two different output levels to be able to eliminate compression at the receiver side
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