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[TowerTalk] Stranded vs solid wire

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Subject: [TowerTalk] Stranded vs solid wire
From: (Jim Pratt)
Date: Tue, 23 Dec 1997 12:51:34 -0800 (PST)
Perhaps slightly off topic, but hopefully interesting nevertheless:

Andrew, the maker of Heliax and Superflex transmission lines, has a 
series of "technical documents" that claim to demonstrate the 
superiority of solid center conductor transmission line versus 
stranded.  This also "demonstrates" the superiority of solid shields 
versus braided shields.  Their dissertations are based on the "facts" 
that stranded and/or braided cables have many, many more wire-to-wire 
junctions in which intermodulation could be created IF such a junction 
were to corrode.  If you used a solid shield or center conductor, such 
junctions would be eliminated.  They have all sorts of laboratory data to 
emphasize that.

I still prefer braided cables for pigtails when outdoors, due to 
empirical evidence I have about the solid shields breaking in the wind 
after years of flexing.  Also, it isn't a good idea to use a solid 
conductor to go around a rotator joint in an amateur installation as it 
will stress and break before a stranded conductor (IMHO).

I am sure it is only a coincidence that Heliax and Superflex both have 
solid shields, and that Heliax has a solid center conductor! ;=>

73 and Happy Holidaze,

Jim  N6IG

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