This photo from 2012 was found earlier. I cannot remember if this was the original 500 kHz transverter or the one for I did for 472 kHz. The 472 kHz one has been used most autumns and winters with my earth-electrode "antenna" in the ground on WSPR. Even though the ERP is very low, it is regularly gets spotted in Norway. The transverter produces 10W, but the ERP is about 10mW.