Posted by Dan T in MO on March 06, 2013 at 19:55:23 from (166.181.3.4):
In Reply to: Re: O/T am radio posted by Gambles on March 06, 2013 at 17:00:54:
That has more to do with the frequency of the carrier wave than with the type of modulation. Lower frequency waves tend to hug the curve of the Earth better than higher frequency waves. The U.S. Navy use ELF (around 3 cycles per second) to communicate with submarines around the world.
The AM band is between 530 thousand and 1,600 thousand cycles per second while the FM broadcast range is between 87.9 Million and 107.7 million cycles per second. I may be off a bit on the ends, but you get the idea.
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