[TowerTalk] Dacron rope as an insulator
Roger (K8RI) on TT
K8RI-on-TowerTalk at tm.net
Fri Mar 31 23:27:09 EDT 2017
Don't know about your rain water, but ours is no longer clean even
though I'm in the country and a long way down wind from industry. I'd
put an insulator where it connects to the element on each end. Some
just tie the Dacron rope to the end of a wire antenna, even though an
end insulator is recommended.
Personally, I'd use the small Phillystran but it's one whale of a lot
more expensive than Dacron rope. I have bith.
73, Roger (K8RI)
On 3/31/2017 3:38 PM, Jim Thomson wrote:
> How good is dacron rope, as an insulator for HV? I am planning on using .3125 dacron rope as an overhead truss for the shortened 80m rotary dipole.
> One length going out each side of the mast. They will terminate on the mast, aprx 4 ft above the 80m dipole, with a small turnbuckle on each side of the mast.
> The other ends will terminate 15 ft out each side of the main trunk section, which is 2 inch OD tubing. This will also be just a few inches inboard of the T bar
> capacity hats. Balance of loading is done with the tornado drive, which consists of a pair of compressible 6-12 uh coils at the feedpoint.
> Going out 15 ft will be at a HV point, esp since thats also way outboard of the 6-12 uh coils at the feedpoint.
>
> Will 15 ft be enough to stand off the peak V....esp when soaking wet ? IF each side is opposite polarity, then it gets even worse, as the potential difference
> right at the mast could be substantial under some conditions. Or do I need to install an insulator on either side of the mast, right at each turnbuckle ?
> Id rather not have to install insulators if not required, but have no experience with dacron + HV.
>
> Jim VE7RF
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73
Roger (K8RI)
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