[TenTec] 450 Ohm feedline

[Bwana Bob]

Yes, even before bundled cable, when long parallel lines were run on the
telephone poles, the wire positions on the poles were periodically
interchanged. One wire was dropped under the other and crossed over to
its opposite side by means of a "drop bracket".

Hey! Maybe this is the solution to BPL interference: Make the power
companies twist the power lines!


			73,

			BoB WB2VUF

JAMES HANLON wrote:
> 
> Bob wrote:
> 
> > Regarding twisting the feed-line, why do you suppose the phone company
> > called it "a twisted pair"?  Answer: because that what it was and it was
> > used to maintain symmetry and thus reduce induced voltage from overhead
> > power lines.  Same applies here.
> >
> 
> I'm an old Bell Labs engineer, and I can recall being taught in our "CDT"
> (Communications Development Training) courses that the pairs were twisted to
> cut down on the cross talk from other pairs bundled into the same cable.
> I'm sure it helped for power line induced voltage as well though.
> 
> Jim, W8KGI
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