Hello Pete!
On 04 Apr 98, Pete Stan wrote to Al Thompson:
 PS> Radio waves are not unlike our guitar strings. After all we call it 
adio
 PS> wave instead of sound wave only because it is outside of the human 
hearing
 PS> range.
Slightly inaccurate, though close enough for comparison purposes, as radio 
waves are electromagnetic and can travel through a vaccume, but not an 
insulator, and sound waves are pressure waves and cannot travel through a 
vaccume, but may pass through many electrical insulators.  The usable RF 
spectrum goes all the way from a couple of hz (well below the range of human 
hearing), through the ghz range where we find microwave, spread spectrum, 
etc...
C-ya! Rich
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