[TowerTalk] Teflon Coax with Center That's NOT SCCCS?

Jim Thomson 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.   

Jim   VE7RF

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