[TowerTalk] Teflon Coax with Center That's NOT SCCCS?
jim.thom at telus.net
Tue Jan 16 17:59:06 EST 2018
Date: Mon, 15 Jan 2018 22:13:07 -0800
From: Jim Brown <jim at audiosystemsgroup.com>
To: towertalk reflector <towertalk at contesting.com>
Subject: [TowerTalk] Teflon Coax with Center That's NOT SCCCS?
<All the 0.195-in o.d. TFE coax cables I can find have a center conductor
that is silver-coated copper-coated steel. This is fine above HF, but
it's not great for 160M and 80M, where the steel is contributing to loss.
Can anyone point me to a 50 ohm TFE 0.195-in o.d. cable whose center is
NOT coated steel?
Likewise, they all have a solid center with a 2-in bend radius. Anyone
know of one with a smaller bend radius?
73, Jim K9YC
## have u actually measured the loss, on a CM choke, using the typ lengths
of coax used, say on 160 + 80M ?? I mean like using a wattmeter on each end.
I have not done this, but am set up to do so. RG-303 is what I have right now,
so will try it some time on 160-80-40 m...since I use it for line isolators, which means
coax connectors on each end of the box, so testing for loss would be a simple matter.
## RG-400 has no steel...and is what u want, only game in town.
RG-142 does have steel, as does the bigger RG-304
and a few other teflon coax cables. RG-393 has no steel either, but its huge vs RG-400.
RG-304 is .280 OD, and a 14.5 gauge center conductor, but has the steel core.
RG-304 is very hard to obtain new, its not made, unless special ordered. They dont
make a NON steel version of it either.
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