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#9
September 2nd 06, 09:43 PM
posted to rec.aviation.piloting
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Why don't voice radio communications use FM?
On Sat, 02 Sep 2006 16:58:12 GMT, "Steven P. McNicoll"
wrote in . net: "Ron Natalie" wrote in message om... No actually, it's just historical. Early av radio used AM, and for that reason we still do. Didn't all early radio use AM? Early radio, including aviation, used Continuous Wave (CW) modulation and Morris Code. Edwin Armstrong patented Frequency Modulation (FM) in 1933.* * http://en.wikipedia.org/wiki/Edwin_Howard_Armstrong 
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