This morning Chris G0FDZ/P assisted by Chris G4FJW ,worked G8CUB/P over a distance of 650 metres. Signals were 539 / 599. This extends our initial contact distance. 1km or so now looks possible.
In one direction the rx antenna was a 150mm quasi-optical lens antenna. The other rx antenna was a 30cm cassegrain dish. Both txs used 150mm horns.
At the G0FDZ/P end, signals could be copied on two separate receivers, both using relatively simple x7 harmonic mixers, based on DB6NT 240G x6 mixer pcbs.