On Wed, Apr 23, 2025 at 03:41 PM, Hans Summers wrote:
The SSB calibration tool now tests the PA amplitude modulator first, and refuses to run if the modulator isn't working properly. To determine if it is working properly or not, it sets the DAC value to 1000. This should produce a PA voltage of around?5.02 V in theory. "Fail" is when the measured voltage is outside the range 4 to 7V. Probably this range is too wide and could be considerably narrowed. But it should easily identify cases where a fault in the amplitude modulation circuit is causing the PA voltage to be always at max.,?which would both prevent proper phase distortion measurements, as well as prevent SSB generation working, as well as stress the PA transistors because they'd run at full power during the entire lengthy calibration process.
Might this be why I suspect my PA might have failed just now running calibration cycle?
I know I didn't need to but I wanted to see it run the process so I could see what it was doing...
