Phone Line Ground Loop Hum [RE-wrenches]

[John Blittersdorf, Cent. VT Solar & Wind]

Sparks,
  I wish I was on this list 8 years ago when I was regularly burning up smart 
interfaces (at $200 a pop) and dealing with a string of answering machines 
running on my 12v system with the atrocious hum.  I finally gave up the fight 
when the phone company supplied voice mail.  I am still fascinated with using 
an interconnect device to allow a normal home phone system all connected to a 
bag phone.  It worked well but the 12v power source was causing overheating 
of the unit.  Not being a high tech electronics technician, it was beyond my 
ability to figure out what was happening.  I had to cease the experiment 
before I got too much money tied up in it.  I had extension phones, and fax 
machine connected directly to it.  Do you have any knowledge on the cellular 
interface systems?

John 
CVSolar

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