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ELT Rubber Ducky Antenna?

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bcondrey

Joined: 03 Apr 2006
Posts: 580

Posted: Sat May 27, 2006 12:35 pm Post subject: ELT Rubber Ducky Antenna?

Bob N.,



In the past you've cited the possibility using a rubber ducky style antenna for ELTs.  Would this also be an option for the newer style 121.5/406 MHz types such as the Artex ME406?



Thanks

Bob

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nuckollsr(at)cox.net
Guest

Posted: Sat May 27, 2006 2:44 pm Post subject: ELT Rubber Ducky Antenna?

At 01:35 PM 5/27/2006 -0700, you wrote:



 	  Quote: 	
		  

<bob.condrey(at)baesystems.com>



Bob N.,



In the past you've cited the possibility using a rubber ducky style 

antenna for ELTs.  Would this also be an option for the newer style 

121.5/406 MHz types such as the Artex ME406?



Thanks

Bob


	


   Only if the "rubber duck" has been crafted for dual frequency

   operations. The instance I suggested that the shortened antenna

   be considered was the case where a pair of antennas . . . a 121.5

   and a 406 MHz device were mounted side by side under the fiberglas

   toe cover of the vertical fin fairing on a Beechjet:



http://www.aeroelectric.com/temp/400A_ELT.jpg



   When the fairing cover was installed, metallic braces in

   the fairing upset the SWR on the longer, 121.5 MHz antenna

   and caused self-test failures. They considered the short antenna

   until we discovered that the ELT had been qualified under TSO with

   these specific antennas . . . we couldn't use a different

   antenna without re-qualifying. So . . . they widened the

   trip tolerance on the SWR self check . . . another case where

   under very un-helpful regulation, two wrongs made a "right."



   (sigh)



   Anywho, I suspect your more modern design is paired with

   an antenna designed for optimum performance at two frequencies

   and the simple rubber duck is not an option for you.



   Bob . . .

      ---------------------------------------------------------

      < What is so wonderful about scientific truth...is that >

      < the authority which determines whether there can be   >

      < debate or not does not reside in some fraternity of   >

      < scientists; nor is it divine. The authority rests     >

      < with experiment.                                      >

      <                            --Lawrence M. Krauss       >

      ---------------------------------------------------------

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craig(at)craigandjean.com
Guest

Posted: Sat May 27, 2006 3:05 pm Post subject: ELT Rubber Ducky Antenna?

 	  Quote: 	
		  >

   Anywho, I suspect your more modern design is paired with
	


   an antenna designed for optimum performance at two frequencies

   and the simple rubber duck is not an option for you.



   Bob . . .

<<



The Artex 121.5/406.028 MHz ELTs can be bought bundled with antennas

selected to support the dual frequencies. That's what I did. I'll tell you

how it works after my next crash.



-- Craig

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