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   AMATEUR_RADIO      Ham radio for when Armageddon strikes      2,531 messages   

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   Message 526 of 2,531   
   TOM WALKER to ROY WITT   
   Heathkit DX-60B   
   17 May 14 14:12:00   
   
   RW>Here's a vertically polarized LPDA:   
      
      
   RW>           + what are these?   
   RW>           | +   
   RW>           | | +   
   RW>           | | | +   
   RW>           | | | | +   
   RW>           | | | | |   
   RW>  closed|------------+----feed point   
   RW>    loop|____________+----feed point   
   RW>          | | | | |   
   RW>          | | | | +   
   RW>          | | | +   
   RW>          | | +   
   RW>          | +   
   RW>          + and these?   
      
      
   Directly fed elements.   
   A normal YAGI only has one directly fed element.   
      
   The advnatage of the LDPA is increased bandwidth but at the expense of   
   antenna Gain.   
   But it does make it possible for a single antenna to be used with wider   
   range of frequencies at a reasonable SWR   
      
   Create sells 2 "similar"(the ones I was adressing in my previous   
   posts) antennas one with a 105 to 1300 MHZ bandwidth and another with a   
   50 to 1300 Bandwidth with a claimed 2.0 SWR or less   
   ---   
    þ SLMR 2.1a þ Typo Tom strikes agaoin   
    * Origin: TECHWARE BBS -  Since 1995  -  www.techware.dynip.com  (1:102/401)   

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