(November 5, 2011 at 11:54 am)Darwinian Wrote: No..ok my point is to get to the TRUTH , i search
In the early days of radio, people built and used simple and inexpensive crystal radio sets that worked without electrical power from wall sockets or batteries, and this technology was known as wireless. Even after vacuum-tube radios came into widespread use following World War I, crystal radios remained popular, especially among beginning amateur radio enthusiasts, boy scouts, and school kids, who continued to build crystal radios as their introduction to the field of communications.
And what point are you trying to make anyway? :dodgy:
the history of crystsl radio on google and i found the history of
crystal radio begin in 1904 with the patent for Jagadish Chandra Bose,
bengal scincetest(( the source from wikipedia)) . so how it come (send the radio signal and recieveit?).
