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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 |
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