The fact that it is 75 ohm really doesn't bother me. I use 1inch dia Andrews
hard line at the moment
for a 200 foot run but this other stuff was used for cable T.V. and computor
stuff before they changed out to
fiberglass ,so I wondered if it was better than what I was using now and if
so how much !
It does not have a plastic covering on it so no numbers are visible.
Regards
Art


"Lou" wrote in message
o.verio.net...

"Ed" wrote in message
. 92.175...


I was just given a coil of 7/8 hardline coax that I have not seen
before.
It has plastic discs inside to separate the core from the outer
aluminum tube which I suppose uses air as the dielectric. Anybody got
any info on this stuff
and any advantages it may have over the normal hardline cable?
Regards
Art

That's nothing real new. Yes, is air dielectric and slightly less lossy
than regular foam dielectric heliax. Since you described the outer
conductor as aluminum, I suspect it is 75 ohm cable.... but not
necessarily. There should be info printed onto the outer plastic jacket
material mthat would help in specifically identifying that cable.


Ed K7AAT


In a "Hints and Kinks" book - I believe - or maybe it was an Antenna
Handbook from the ARRL - they described how to make a matching network to
take that sort of heliax to use for 50 ohm purposes.

Lou