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wrapping ssb antenna on kevlar backstay
Steve (another one) wrote:
Dear all May I pick-up on something mentioned in response to my earlier question. It was suggested that running a wire up a kevlar backstay is a simple soultion and avoids having to insulate a piece of conventional rigging. This sounds very sensible to me and plan to try it, it avoids having to mess with exposed connections to a wire backstay. However then Bruce in alaska said: Then just helical wrap the antenna wire around the Kevlar Backstay and have a really nice "Fully Loaded Antenna with alot of electrical length...... Could someone (Bruce perhaps?) explain this. Would I gain performance by simply wrapping the wire ? Is no of turns per length of backstay critical ? Is 'core' diameter critical ? Thanks Steve Whilst Kevlar rope has high tensile strength and low weight, they fail to mention that it weakens rapidly under flexion, i.e. it should never be knotted or doubled back on itself, as when seizing around a snall-diameter thimble. I would think that poses several problem when using as a backstay, unless some kind of patent terminals are available. Our Kevlar main halyard parted quite suddenly and without warning at the thimble a few years ago, and I resolved to go back to wire-spliced pre-stretched polyester in future. Remove "nospam" from return address. |
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