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Turnstile question
wrote in message oups.com... On Jun 17, 12:47 pm, "Jerry Martes" wrote: I figured 1.8 inches for 1066 MHz. I wanted to build it into a pvc pipe cap so there isn't much room to work. Also, am I correct to assume the 1.8 is the total length, including what is stripped back to make the connection? Ralph Hi Ralph I dont know what your needs are for this Turnstile antenna, so my input may be of no value. But, a Turnstile can be made to work by feeding both dipoles with one feed point. No phasing harness is needed. Make one dipole a little short so it is capacitive and the other dipole a little long so it is inducvtive. Jerry The only problem with that is the antenna will still have basically a dipole pattern. I assume he is wanting the usual omni pattern with circular polarization at the higher angles.. But maybe not... You need the phase line if you want a true omni "turnstile" pattern. But saying that , I have used turnstiles with no line.. But usually on 80m.. And it does change the pattern a bit from the original single dipole, but not quite the same as using a phase line. MK Hi MK I may have screwed up, but I think that a pair of dipoles on the same plane, configured like a pair of non-symetrical Vs could be fed with one feed point to produce a free space cardiod pattern. That would be one short dipole and one one longer dipole fed in parallel. Jerry Jerry |
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