I don't think this has been incorporated into the "code" yet, so I created a wiki page explaining the fix??
/g/BITX20/wiki/36181(which gives a snippet of code so enterprising followers can edit their files and recompile with ./build sbitx? ? ? ?)?
and edited the wiki front page to point as well to fix, under "sBitx Code" .? ?Github is beyond me, so this is about the best that I can do.
On MY sbitx it was clearly obvious that upper side band transmissions were lower in power level than lower side band transmissions.? ?The same applied to CW and CWR because they are simply single-tone USB and LSB signals.? ?THis is simply a a fact of life with the IF crystal filter, which is not perfect and has unavoidable passband ripple.? Your filter may have a different response, so investigate with a bit of trials on USB and LSB before blindly copying what I did.
In my case, the rough difference was 3dB (power factor of 2) between USB and LSB.? ?So I simply added a few lines that multiplied the SIGNAL (hence, a voltage) for the frequency bins of the USB signal by 1.4 (square root? of 2).? ?This occurs before the windowing filter, so it doesn't cause any problems.
It has worked well for me, since I do a lot of work with upper sideband modes and wanted the power level to be about the same on upper as lower for the same "drive" setting.? ?Nothing is perfect, but getting close is better.
73
Gordon KX4Z
