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Re: [TowerTalk] Fabricated common mode chokes and their impedances

Subject: Re: [TowerTalk] Fabricated common mode chokes and their impedances
From: K8RI on TT <>
Date: Mon, 29 Aug 2011 16:52:02 -0400
List-post: <">>
On 8/29/2011 4:34 PM, Tom Osborne wrote:
>> Right now I'm using Davis BuryFlex, but would like
>> to try RG8X on 40 (foil plus braid) as it's very flexible, light, and
>> has low wind resistance. The voltages are too high for 8X and CNT240 on
>> 75 and 160 at the band edges..
> Someone posted on here once that the foil and braid isn't a good idea as
> they move around and don't make consistant contact.  73
> Tom W7WHY
Both the LMR and CNT series of cables are foil plus braid for shields. 
"Theoretically" the poor contact makes sense, but in practice I've never 
had a problem with quality "foil plus braid". You do have to be careful 
of Aluminum braid over foil when making connections (You score the 
jacket and then break it rather than cutting it). All of these cables 
require water proof connections.  Get water in the foil and shield area 
and it will rapidly turn into a problem.    I like the additional 
shielding of quality "foil plus braid" over plain braid

The CNT240 was difficult to work with due to the fragile braid over the 
foil.  The wires were easily broken. Once up the coax only lasted about 
5 or 6 months before it broke.   It has a solid and very rigid center 
conductor that is easily broken. The CNT 240 worked great until it broke.


Roger (K8RI)


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