When tuning RTTY signals, I use a. (method) (example) [X] Scope (MMTTY software type) [ ] Scope (a real scope) [ ] FFT display (a la MMTTY) [ ] LED bar graph (PK-232) [ ] LED x-y display (HAL DXP-38) [x] by Ear [ ] other (specify) [ ] I never have to tune. I only CQ. My primary decoder is: MMTTY My secondary decoder is: TrueTTY 73, Hisami 7L4IOU