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