Roger G3XBM's (Mainly) Amateur Radio Blog

This may be of some interest. I wonder how far away it can be seen?  https://www.instagram.com/p/ Ch9cQ8xtH5J/?igshid= MDJmNzVkMjY= English ...

In the past, I only tried 481THz (red light) transmissions with LEDs, but Peter Thornton G6NGR kindly sent me a useful link. There is lots ...

Many years ago, before my stroke, I did some work at 481THz, red light. I used LEDs as the TX element, but I see that there are some comme...

Until I read the webpage below I didn't know that the record for optical morse DX goes back to 1896 and was an astounding distance of 18...

Before I became a radio ham, a friend and I had our first phone wireless QSO using a small torch bulb modulated with a couple of germanium t...

Andy Young has an excellent page about optical mirages which is worth reading. Land has been seen hundreds of kms over the horizon as a res...