I finally made a QSO with the Michigan Mighty Mite (MMM), one transistor CW QRP last nite with Wilbur, KB1CL on 20m band. I got 339 from him.
I homebrewed MMM working on 80m, 40m and 30m band with one coil which I modified and it showed vry small power out on 20m band on my power meter. I measured it with my homebrew QRP power meter after the QSO showing 40mW.
I have been trying a QSO with 20m band but the condx has been poor for almost six months and not successful. Now I have had QSOs on 80m, 40m, 30m and 20m with one coil with my MMM. The original MMM needs a coil on each band respectively and I am glad that one coil which I modified has worked all of four bands.
My next challenge is to up-grade my MMM working on 20m band and 15m band with, perhaps, more power like 100mW to 200mW in the future. I look forward to going on air 20m and 15m band with MMM when the condx became improved.