Roger G3XBM's (Mainly) Amateur Radio Blog

Before my 2013 stroke I enjoyed experimenting at optical frequencies and was amazed that I could decode my QRSS CW well over the horizon wit...

Way back in 2012 I was doing optical work at 481 THz.  The photo shows some initial tests along the road at the old QTH.  Later, some tests ...

This was much easier than I thought.  Although my "thing" is NLOS (non line of sight) over the horizon digital comms, I have tried...

In view of my earlier post, it is probably a good idea to point you to my pages on optical communications. I have not been able to do much i...

This photo popped up as a Facebook memory today.  It shows my early trials trying to receive my 481THz optical CW beacon in daylight along t...

For the uninitiated, 481THz is red light.  My main interest in lightbeam communication was over the horizon beaconing (NLOS), but I did have...

OK, these are tiny steps. Yesterday I did a test reflecting my optical beacon from the kitchen, off the museum roof, to the RX in the loung...

In 2012, I bought several of these from the USA. My intention was to use these very powerful LEDs in my experiments with 481THz light commun...

It is some years since I seriously worked on optical communications. My main "thing" was over the horizon, so called non-line-of-s...

As you will have seen, after a very long break, I took my first tentative steps back into optical communications yesterday.  Before my stro...

It is about 7 years since I last tried anything on 481THz (red light).  So, today I dug out my optical beacon TX and RX and tried some test...

  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 ...

It is many years since I tried any optical communications, because of my poor health:  I have been too giddy for field work.   Hopefully, th...

Yesterday I mentioned that some years ago I bought some Flatlights (very high power LEDs) to allow me to get further over the horizon with l...

Many years ago before my 2013 stroke I bought some Flatlights ( very bright LEDs) from the USA to enable me to get further with my optical e...

Optical RX Until my stroke in 2013, one of my joys was building and testing optical communications gear. Although I had a successful lin...

Long before my 2013 stroke , one of my favourite things was optical communications. Although my keenest interest was weak signal "o...

Whilst looking through some old Google photos, I came across this one of my 481THz (optical) receiver. It was used in my "over the ho...

On my own main website is some information (now very dated!) about my own experiments with optical communications at 481THz (red light) . I ...

Since my 2013 stroke I have not felt fit enough to do field work. I really miss my 481THz over the horizon NLOS (non line of sight) optical ...