[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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