For your particular purpose, you might consider a polyester covered
kevlar material of the minimum diameter required to carry your
calculated load plus a little engineering buffer.
Some folks use this material for guy wires and the like.
It has good strength in tension, doesn't stretch much, less
cross-sectional area, etc, etc.
______________________
Clay Autery, KY5G
MONTAC Enterprises
(318) 518-1389
On 3/31/2017 2:38 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
>
_______________________________________________
_______________________________________________
TowerTalk mailing list
TowerTalk@contesting.com
http://lists.contesting.com/mailman/listinfo/towertalk
|