Modulated light communications

When I was fit and healthy, I enjoyed experimenting with over-the-horizon optical communications using homemade kit and free software. As I recall my RX was based on one from the website below. Personally, I found optical communications more rewarding than microwaves. All the gear was homemade, including the optics and test gear. It was inexpensive and one was working "at the frontiers". Not forgetting the most important thing - it was fun.

See http://www.modulatedlight.org/optical_comms/optical_index.html

See also my own page at https://sites.google.com/site/g3xbmqrp3/optical