Erik,
Thank you for the table. It confirms what I wrote in the post at:
/g/nanovna-users/topic/power_output_from_ch0_of_the/34444428?p=,,,20,0,0,0::recentpostdate%2Fsticky,,,20,2,0,34444428
So the third harmonic IS used on CH0 for 300-900 MHz, in both CW mode and in sweep mode. I was not aware of that; however, it does make sense.
--
Bryan, WA5VAH