"Gordon Hudson" wrote in message
...
Been done. UK record, as of a couple of years back at least, was
something
like 75km. There is project in the latest RSGB handbook (if you are
interesed I'll look up the page, I noticed the article but haven't read
the detail).


Many years ago Practical Wireless had adesign for turning every ready
torches (the ones with the big 9v batteries) into a transmitter and
receiver by amplitude modulating the bulb.
It actually worked (over about 20 feet).

Remember it (or one like it) well- it was one of the many projects I tried
as a youngster. (Same sort of time I played with the Fuller Phone).

With a laser pointer but I'm not sure how linear the transfer function is-
ie is it linear enough to make AM viable. I've not looked into this but
maybe someone will know.

--
73
Brian
www.g8osn.org.uk