>> The advantages of using DC for such long distances is
>> reduced losses (due to capacitive coupling and EM radiation) and
>> relieving the need to synchronize phase (which is difficult to do
>> between two ends of a very long transmission line with a varying
>> load).
I have pondered phase issues with long transmission lines particularly
when an area is fed by 2 different paths for redundancy, if they do
such a thing.

I always considered a varying signal to travel with less loss.  My
reasoning elludes me know.
--=20
http://www.piclist.com PIC/SX FAQ & list archive
View/change your membership options at
http://mailman.mit.edu/mailman/listinfo/piclist
.