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On 26 Jun, 13:34, John Smith I wrote:
Buck wrote: ... The section below with pictures made a difference. I saw that the patent is in concept, that is the arrangement of the coils for the desired effect and the design of coils which can be helical, squared off, etc. Thanks. Buck Buck: Yeah, all that alright. However, he also claims the "arrangement" he has increases the impedance of the 1/4 wave shortened antenna to 72-100 ohms. This is interesting in and of itself, shortened antennas tend to have impedances in the single digits and are difficult to match efficiently ... I am just beginning to toy with this version, maybe can get serious this weekend ... Regards, JS John, I know nothing about vertical whips and I haven't been following the whole thread but it does come to mind that the aperture, which is related to gain, appears to be determined by the smallest diameter drawn that can include the antenna physical configuration. Ofcourse to do this is to have the largest capacity hat as possible with the minimum wire resistance wire that obtains the highest resistance(coil windings) meaning that even if the actual resistance is high so is the radiation resistance. All these factors are varying in curve form ( See Terman for typical curves of all variables) so you may get some insight on what is really happening by reviewing the cross over points of some of these curves relative to the diameter of the capacity hat. Take all of this with a pinch of salt but the answer may well be there some where when looking for the size of the aperture. Regards Art |
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