Found a way to modulate a crystal oscillator, FSK that is, w/o any additional efforts. Not sure if it has been done in that way ever before. By now, I am too tired to create some schematics, I will offer something on the webpage (not here thus) soon.
To give an appetizer, I think, building a MEPT for QRSS on 20m is done in less than five minutes... with me having spent night on that, that is....
