NB> Since the doubling of power only increases signal 
 NB> strength by half an S-unit, I can't imagine why 
 NB> they go to all that trouble. But then, this IS the 
 NB> US Government we're talking about. :-)
They really don't measure the increase in S units. The increase is figured in 
miro volts per square meter. If you look at the difference in the coverage 
maps, you can realize a significant difference.
Enjoy!
de W0TLO
John
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