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Using speaker wire for a dipole
John S wrote in :
Maybe because NFPA 70 costs $150 US? Yes, standards are expensive things and it is a frustration when researching. Anyway, NFPA makes recommendation on the wires for ham antennas specifically, and it may be binding in some places. I suspect the reason for ignoring it is that the advice is unaccepable to most hams. That said, it does seem over the top in some areas, and is hardly comprehensive in its thinking. For example, the prescription for feedlines seems to not be aware of the existence and use of coax. I guess it is these gaps that give critics the basis for arguing against the whole thing. Anyway, in respect of antenna wires, it does not 'permit' annealled copper or other low strength materials, and it 'requires' a minimum conductor diameter of #14 for up to 150' span. They may have had in mind the risk to persons and property where low strength conductor are broken in high wind and make contact with power lines. Owen |
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