I would disagree on the later comment as in the commercial world it would 
be quite incorrect....

We have been using telco 2 wire and 4 wire DC control and Tone control 
lines for years. I know of some dispatch operations which use them hundreds 
of miles, while not the cheapest method, it still works.... Telco has been 
providing them since the 50's or 60's at least....and still does, although 
getting DC continuity is no longer very easy....

Thousands ( probably millions ) of them in service in this country alone, 
let alone the rest of the world...
Newer technology is replacing some of them with VOIP technology over 
Internet circuits instead of full period lines where time of arrival is not 
critical..

Doug
KD8B


At 09:18 PM 8/1/2005, you wrote:


> > OTOH, if you can put your receiver and transmitter
> > any appreciable distance
> > apart, and use two antennas and feedline, then you
> > just need to wireline the
> > audio signals between them.
> >
> >
>Wireline from about 1000 feet to a couple of miles ?
>I don't think so.  Sepreation of this distance for 10
>meters usually means a radio link.
>
>
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