The formula for upper and lower sideband is explained in the sketch. Simply uncommenting a few lines and adding the Fbutton will allow you to switch between U/L SSB. I am setting mine up this way to allow USB for use on MARS. Mars uses USB regardless of frequency. I am also encoding split mode. This has been a total blast and a learning experience playing with this BITX40.
QUOTE- "If you set the VFO frequency to 26 MHz, the sideband is automatically inverted. You will not need to move the BFO from LSB to USB for 14 MHz".
Then if that is true then setting the VFO frequency to 19Mhz? (19-12=7) will invert- (USB) for 7Mhz? Then enabling Digital modes?? Something the Raduino could do?
