Loading coils used also as traps are my focus. Alpha Delta uses what they call an Iso-Res Isolation (trap) and Resonator (loading coil) in their antennas. Bill Orr mentions a few antennas in his books that use them, but they are cookbook examples for building and nothing on the design of the dual function coil.
Can any one provide me with a book reference or a URL etc. that might provide clues as to the design, building and measurement of such devices? I realize that certain coils have a self-resonance and I can find info on that, but there are no references that apply this self-resonance to an antenna design. Contact me direct, if you wish. [email protected] More detail if you wish to read about it..............JP sent me a design of a shortened EFHW for 80 and 40 that uses a 110 uH coil near the end of the antenna wire that provides loading for 80 MX and traps 40 MX energy, thus making the antenna dual band. I modeled it in EZNEC based on the basic design, and lo and behold the antenna when doing an SWR sweep does indeed resonant on 80 and 40. Displaying the currents on the wire show that it is used at full length on 80 and stops at the coil on 40. I think I am missing something in my research. TNX for reading....any help appreciated. TNX ES 73....W5RH Rick Hiller *e-mail: [email protected] <[email protected]>H choke * *Cell: 832-474-3713* *Physical: 9031 Troulon Drive* * Houston, TX 77036*
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