I appreciate everyone's comments and direction. I knew if I pondered the question long enough and with the help of a few antenna craftsmen the answer has come to me. It's nice to have knowledgeable and interested friends.
For others, discovery is a light going off or a bell dinging when you get the answer you seek. For me, most of the time, it is either a Homer Simpson "DUH" or a 2 x 4 to the side of the head. It's was no different this time. The answer to be told soon after a few EZNEC runs. Thanks for all of your comments. Regards...Rick W5RH On Sat, Jul 9, 2022 at 8:57 PM Rick Hiller <[email protected]> wrote: > 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* > -- Rick Hiller *e-mail: [email protected] <[email protected]>* *Cell: 832-474-3713* *Physical: 9031 Troulon Drive* * Houston, TX 77036*
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