on 3. October 2020 at 18:50 UTC we had the following QSO:
DC6UW in JO51XO with DL3ARM in JO60LK QRB = 147km
QRG: 440THz / 630nm red light
we tested AM and also FM with 25kHz subcarrier. reports 59 / 59
more stations had QSO the same distance later on this evening:
All stations had LED as TX (Phlatlight PT39 red etc. )
As RX we had Avalanche Photo Diodes.
RX / TX Lenses are 300x400mm Fresnell with 700mm focal lenght.
see/listen more :
sorry for that is only german language.
73 Jo DL3ARM