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Choke balun (was: Interesting 144 foot Dipole)
Cecil Moore wrote:
When one feeds the antenna system at a current maximum point, the balun is non-critical. I am presently using ten turns of RG-400 on an FT-240-61 toroid with no Hi Cecil, It seems like it's been a decade since we debated on RRAP. I hope all is well with you. I plan on erecting a multi-band inverted V with several insulators and associated shorting connectors along each leg so that with all connectors open, the antenna is resonant on 10m; with the first insulator on each leg shorted, the antenna is resonant on 15m; with the first and second insulators on each leg shorted the antenna is resonant on 20m; et cetera. Shorting and opening insulators is easier than winding accurate chokes! For a balun, I'm considering N4UJW's "Ugly Balun" (see http://www.hamuniverse.com/balun.html). UJW leaves the diameter of the coil form to the reader, only specifying that 18-21 feet of coax be used. Can you (or anyone else on RRAA) tell me if there is an optimum diameter, considering that most of my operations will be on 20m? (On that page, UJW has two balun projects -- see the first one.) Warmest regards, Jeff KH6O Chief Petty Officer, U.S. Coast Guard Mathematics Lecturer, University of Hawaii System -- |
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