I've noted no deterioration in the Dacron braided rope. after 8 or 9
years http://www.davisrf.com/dacron.php
I use the 3/16ths inch as well as the 5/16ths. The 3/16ths I use is a
black, single braid, while the 5/16ths is a double braid. They are
relatively inexpensive and have little stretch, but as I said in another
post, they handle the high tension of roughly 200# with ease as the 3/16
ths has a 770# plus strength. 5/16ths is over 1700# strength, but a bit
more expensive.
I've had several 500 and one 1000' rolls for some years, so I have no
hesitation at using the stuff.
So far, I've had no problems with RG8X LL at the legal limit except on
160 and 75. Davis BuryFlex(TM) has done well so far, but I prefer the
lower cross section and lighter weight when it's suspended from the
unsupported center of an antenna.
As for a dynamic weight tensioning I prefer as much weight (or tension)
that I can use safely. With enough weight the antenna and weight will
not get into an oscillation. There should be enough weight that the
antenna can not lift the weight in such a manner as to release the tension.
If enough weight is too much for the antenna, I'd go to a larger wire size.
Unfortunately, all the CopperWeld antenna wire I've had, lost its copper
coating and turned to rust in just a few years, so I've had to resort to
stranded, hard drawn Copper antenna wire of #10, or 12 size. The
deterioration is probably the same thing that ruins Nylok nuts. The
Nylon just seems to dissolve.
73
Roger (K8RI)
On 8/11/2016 Thursday 10:08 PM, Richard (Rick) Karlquist wrote:
Bungie cord is self damping.
Put it in a PVC pipe so the
sun doesn't damage it.
Rick N6RK
On 8/11/2016 7:06 PM, Mike Fahmie via TowerTalk wrote:
One can use a combination of the two to damp the response!
-Mike-
From: Gary <gary_mayfield@hotmail.com>
To: "towertalk@contesting.com" <towertalk@contesting.com>
Sent: Thursday, August 11, 2016 6:25 PM
Subject: Re: [TowerTalk] Weight on ends of a OCF diploe
I saw an amazing thing once. The South Dakota breeze caused my
weight to head upward with some momentum. The antenna then went
slack while the weight was still moving upward. The wind caught the
antenna tightening it while the weight was headed back down literally
causing a snapping sound when the weight bounced. I'm sure it applied
a great deal more instantaneous force than the weight alone. The next
morning the weight and antenna were on the ground.
I replaced the weight with rubber 'bungee' tensioners, and it never
failed again. The sun eats up the tensioners so the need to be
replaced occasionally.
73,
Joe kk0sd
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