481THz optical beacon

 

One of my Facebook memories today was this photo of my 481THz optical beacon. This was made in 2012 I think. 

I still have it and hope to use it again. It uses a K1EL keyer to produce either CW or QRSS. My first test is likely to be some sort of reflection test, possibly off trees.

It seems I like to experiment at the extreme ends of the spectrum, HI.  Either VLF (sub 9kHz) or optical comms (481THz)!