481THz speech communications

Long before my 2013 stroke, one of my favourite things was optical communications.

Although my keenest interest was weak signal "over the horizon" signals, so called non line of sight (NLOS), I had one QSO with speech over a path of about 11km with G4HJW using the kit shown in the photo. Sadly my stroke put an end to my optical experiments.

See https://sites.google.com/site/g3xbmqrp3/optical