One of the beta testers did a very good job at measuring the power linearity of an uncalibrated tinySA.
Uncalibrated implies the absolute level may be a couple of dB off but the relative steps should be accurate
First the low input
And the high input
From these measurements that are a couple of conclusions.
The 1dBc of the low input is possibly at or a bit above 0dBm
The 1dBc of the high input is expected to be close to -10dBm
The low input LPF is at -3dB around 300MHz and at -6dB at 350MHz. This will have to be compensated for.
Below 1MHz the low input is having some problems. These possibly can be corrected by adjusting AGC and LNA
Below 0.4MHz the phase noise limits the low end of the power measurement range
The high input is flat +/- 1.5dB over the whole range
The power level measurement is close to the official +/- 1dB overall linearity.
Overall this measurement confirms the spec on the wiki.
