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Coax Collinear Element Materials and Velocity Factor
wrote in message ... 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 Hi Dave Opinion -- If your options are either 5 radiating elements, all slightly shorter than 1/2 wave, or 4 longer elements, there wil be no decernable difference in which is best. If you are contemplating the construction of an antenna much longer than several wavelengths, you will encounter problems much more siginificant than efficiency,. So, in my opinion, the "best" is whatever you find convenient. Jerry KD6JDJ |
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