See http://www.m0nka.co.uk/ for the original design.
See https://www.eham.net/reviews/detail/13489 for the review of the Chinese clone.
Simple QRP projects, 10m, 8m, 6m, 4m, FT8, 160m, WSPR, LF/MF, sub-9kHz, nanowaves and other random stuff, some not related to amateur radio.
Opening SPRAT 206 I was pleased and surprised to see my 6m Sixbox QRP transceiver. It was entered into the Constructors Competition . It is ...