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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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