Setup Raspberry Pi to send/recieve sstv signals via ham radio Via Chertsey radio club or install on regular Ubuntu (still have to compile for latest and greatest version) using instructions here.
Great site on recognizing digital modes via waterfall. Via G4UCJ
Most of my digital modes on Raspberry and Linux in general are via WSJT and FLDigi (sudo apt install fldigi)
Ever wonder what difference an antenna makes?