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|    AMATEUR_RADIO    |    Ham radio for when Armageddon strikes    |    2,531 messages    |
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|    Message 612 of 2,531    |
|    TOM WALKER to ROY WITT    |
|    LPDA    |
|    02 Jun 14 07:15:00    |
      RW> TW> All antannas are built form some Schematic or theory Drawing aren't       RW> TW> they?              RW>Not always...I have the makings of a LPDA in my shop, that will require me       RW>to cut the elements as I assemble them to the booms. The only drawing is       RW>one that I used to help me see it in my mind. No theory, just lengths and       RW>spacing dimensions from an experimental antenna built years ago.              IF you used "Cut and try" to determione the length that is how you       Developed the "Theory" of your antenna.       And you built another one form that "Theory".                     RW>models is called - KLM-27el-UHF-BandPass-Antenna, Model KLM-420-470-27.              RW>The model number speaks for the antenna;              RW>Manf - KLM * Band - 420-470MHz * Elements - 27 * Length 120" aka 10 Feet.              RW>It has 4 elements that are considered to be LPDA, while it has 23       RW>parasitic elements that are called directors with one reflector.              the one I am talking about has NO directors or Reflectors as in a       Standard YAGI                     RW>The 4 element 'dipole array', are seperated and fed with the cross links       RW>as you describe, but the factory labels them as 'phasing straps'...              ALL elements, 7, on my antenna are seperated and fed with the cross       links, phasing straps, or whatever you want ot cal them.                     It is not a YAGI       ---        þ SLMR 2.1a þ 0         * Origin: Fidonet Since 1991 bbs.docsnetservices.com (1:123/140)    |
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