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.
I have to confess I have no idea where these are and the callsign does not help. In a short while I shall look them up. This is a QSL card....