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Coax Collinear Element Materials and Velocity Factor
I always assumed having more 1/2 elements in a collinear was best,
because that obviously raises gain and lowers angle. So from that point of view, I was thinking that it would actually be better to use a low VF coax, since that would give you shorter length elements, thus being able to fit more elements in a shorter space. But I've also read that having the element lengths closer to actual 1/2 length (longer) is actually more efficient than having more elements at a shorter (low VF) length. Just wondering what people's opinion is on this... So lets say you have a choice between using the insulated center conductor of a VF 78 coax through brass tube outer elements and having room for a few extra elements in a given length, verses using just an insulated wire that has a 99 VF through brass tube outer elements, thereby allowing slightly less elements because they're longer, but the elements you do have are closer to actual 1/2 length. Which would be best? And this is basically various UHF bands we're talking about. Thanks for any opinions, Dave |
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