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On Mar 25, 9:53*am, John Ferrell wrote:
There are a lot of Hams who still think a short resonate dipole is just as good as a full size dipole. That would be true if everything was lossless. Unfortunately in the real world, a short dipole *system* almost always suffers more overall losses than a well-designed full size dipole *system*. In general, the shorter the dipole, the greater are the losses in the process of transferring energy from the source to the load. Short dipoles are indeed efficient radiators of the *energy delivered to the antenna*. The loss problems are in the energy transfer/delivery systems, not in the energy radiating system. The reason that a high-Q center loading coil system has less loss than a 100% helical system is interesting. The impedance discontinuity at the loading-coil/whip junction yields a lossless phase shift that contributes to the electrical length of the antenna. It is a rare "something-for-nothing" gift from the Antenna Gods. ![]() -- 73, Cecil, w5dxp.com |
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