To: | <[email protected]> |
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Subject: | Re: LF: Kevlar guy rope for radiating mast ? conductive ? |
From: | "James Moritz" <[email protected]> |
Date: | Sat, 2 Feb 2008 01:26:02 -0000 |
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Dear Graham, LF Group, The problem with rope as an insulator is that, when it gets wet, its dielectric properties will become poor, however good an insulator it is when dry. I expect with the present relatively QRP levels at 500kHz, this will just lead to somewhat increased antenna loss resistance. But with more power coming into use soon at 500k, heating of the wet rope may become a problem. It certainly is on 136k - poor conductors/inslators in contact with or close to the antenna conductor have a habit of melting or catching fire. So would be a good idea to join the guy ropes to the mast via insulators. If you are within reasonable distance of a fishing port, the braided twine that chandlers sell for repairing nets, etc. is pretty good for sun/weather/wear resistance, and a lot cheaper than the kevlar cord. The main advantages of the kevlar stuff seem to be that it hardly stretches at all under strain (if that is useful), and it is quite thin for its breaking strain, which helps to make it less visible to disapproving neighbors and the like. I have had some of this guying a mast for several years now, and it seems to be coping quite well with the elements Cheers, Jim Moritz 73 de M0BMU |
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