"jm" wrote in message ...
Hi,

I need informations on old radio system based on galena stone.
Is there anyone on this newsgroup that is specialist in this or is there anyone that can route me
on another newsgroup more appropriate or any community ?

Don't know if a newsgroup specifically dedicated to galena crystal/cat's whisker, but these links
should be useful:

http://www.vintageradio.me.uk/crystal/catswhisker.htm
http://www.acmi.net.au/AIC/CRYSTAL_SET_3.html
http://earlywireless.com/gecophone_no1_picinfo.htm
http://home.earthlink.net/~wb5rex/xt...detectors.html
http://crystalradio.net/contest/paul2.html
http://dspace.dial.pipex.com/town/pi...stalsets1.html
http://www.bizarrelabs.com/crystal.htm
http://www.biology.utah.edu/goldenberg/fun.html

Glenn AA5PK