"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