[BC] Getting phones on the air

[Dana Puopolo]

IN ther '60's you could buy 4 wire service in Boston (though it was 
very exepensive). The first pair was normal telco.  The second pair 
was caller only. Worked quite well, no hybrids needed.

-D

------ Original Message ------
Received: Tue, 01 Jan 2008 07:12:03 PM EST
From: Broadcast List <Broadcast at fetrow.org>

Imagine though if we did have a four wire system.  Not only would on 
the air phone calls sound better, but the caller could be fed higher 
levels and actually hear what is going on.  (For the non-technical; 
broadcast hybrids feed the phone line at a lower than normal level, 
sometimes as much as 10 dB lower, in order to have less leakage back 
into the hybrid output/console input.)