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70th Anniversary FM Commemorative Broadcast
Anonym1ty writes "A special commemorative FM broadcast Saturday, June 11, at noon (EDT) will mark the 70th anniversary of Edwin H. Armstrong's first public demonstration of wideband frequency modulation (FM). The transmission, from Experimental Station WA2XMN (reminiscent of Armstrong's W2XMN call sign) will be on Armstrong's original 42.8 MHz frequency and will emanate from his landmark 400-foot Alpine Tower in NJ. The program will tell the tale of FM's difficult birth, as well as its impact on present-day communications and will include excerpts from a recording of a 1941 test broadcast of the New England Yankee Network. For those unable to receive 42.8 MHz FM, the broadcast is being retransmitted by WFDU-FM on 89.1 MHz and via the Web. Rebroadcasts will take place June 14 and 16 at 7 PM (EDT)"
To play it via linux:
mplayer -cache 128 http://64.92.199.76/WFDU-FM
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I hope we can setup some mirrors so during the broadcast they don't get slashdotted. anybody know how to convert asf to mp3? if so someone setup a mother stream. I am writing up a script right now for dynamic redirection on their server.
Well, FM was and is still important. Popular modulation schemes include both frequency modulation and amplitude modulation, but either is appropriate in different settings.
One advantage to FM is its relative immunity to certain kinds of noise (often noise is additive, and hence the amplitude is affected directly by noise whereas the frequency is less affected).
FM is the precursor to (and was at the time) more noise and jam-resistant schemes. The tradeoff is it requires greater bandwidth than AM to transmit a given signal.
Check out this wikipedia link to find out more about different MODULATION schemes...