[Antennaware] Re: 40m vertical questions
Barry L. Ornitz
ornitz at tricon.net
Wed Sep 24 18:26:11 EDT 2003
Durwydd MacTara wrote:
> .105 dia. Grass trimmer line is cheaper than dacron and just
> as strong!
Unfortunately string trimmer line is almost always Nylon
(Nylon 6 with plasticizers is a common composition). Nylons
as a class have poor ultraviolet resistance. They are also
attacked by acids in acid rain and in industrial environments.
I have seen some cheap "wannabe" string trimmer
line made from polyolefins too. These fair even worse in
Dacron is DuPont's trademark name for their line of
polyethylene terephthalate (PET) polyester fibers. This
material has excellent ultraviolet resistance. [It dissipates
the energy produced by ultraviolet absorption by fluorescing
at a longer wavelength.] PET is also resistant to most
Stick with the Dacron or polyester rope if you want good life.
73, Dr. Barry L. Ornitz WA4VZQ ornitz at tricon.net
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