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xponder ant mounting

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woxofswa

Joined: 12 Aug 2008
Posts: 349
Location: AZ

Posted: Sat Jun 06, 2009 10:55 am Post subject: xponder ant mounting

Since I already installed a reinforcement plate into the floor of my tailcone to mount my ground power receptacle, is there any reason that I can't mount my transponder antenna into the same plate an inch or two from the piper plug receptacle?



Thanks in advance.  I am loathe to drill holes into my skin without checking first.

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_________________
Myron Nelson
Mesa, AZ
Flew May 10 2014

nuckolls.bob(at)aeroelect
Guest

Posted: Mon Jun 08, 2009 6:26 am Post subject: xponder ant mounting

At 01:55 PM 6/6/2009, you wrote:

 	  Quote: 	
		  



Since I already installed a reinforcement plate into the floor of my 

tailcone to mount my ground power receptacle, is there any reason 

that I can't mount my transponder antenna into the same plate an 

inch or two from the piper plug receptacle?



Thanks in advance.  I am loathe to drill holes into my skin without 

checking first.


	


     I see no structural problems with it . . .



     One usually mounts the xponder antenna

     on the belly centerline. I presume your

     ground power jack structure is off to one

     side. I doubt that an off-center antenna

     location is any big deal.

        Bob . . .



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

        ( . . .  a long habit of not thinking   )

        ( a thing wrong, gives it a superficial )

        ( appearance of being right . . .       )

        (                                       )

        (                  -Thomas Paine 1776-  )

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

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rv8iator

Joined: 11 Apr 2006
Posts: 145
Location: Newberg, OR

Posted: Tue Jun 09, 2009 5:45 am Post subject: xponder ant mounting

Bob et al...



While on the subject of xponder antennae...   I am helping with wiring of a Kitfox (rag & tube) and we need to mount a xponder antenna.  IIRC the antenna requires a ground plane 12 inches in diameter.  Is this correct?  The xponder frequencys are 1030 and 1090Mhz which is a wavelength of about 291mm and 275mm or about 12 and 11 inches.  I would think I would tune for the lower freq as the higher would be inclusive.



A 12 inch diameter aluminum plate with the antenna monted in the center is my plan...  please feel free to educate me  further!



Thanks...

Chris Stone

Newberg, OR

Rv's 'n' Kitfox's



--

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_________________
C. Stone (RV8iator)

nuckolls.bob(at)aeroelect
Guest

Posted: Tue Jun 09, 2009 2:51 pm Post subject: xponder ant mounting

At 08:40 AM 6/9/2009, you wrote:




Bob et al...



While on the subject of xponder antennae...   I am helping with 

wiring of a Kitfox (rag & tube) and we need to mount a xponder 

antenna.  IIRC the antenna requires a ground plane 12 inches in 

diameter.  Is this correct?  The xponder frequencys are 1030 and 

1090Mhz which is a wavelength of about 291mm and 275mm or about 12 

and 11 inches.  I would think I would tune for the lower freq as the 

higher would be inclusive.



A 12 inch diameter aluminum plate with the antenna monted in the 

center is my plan...  please feel free to educate me  further!



     The "ideal" ground plane has a radius equal to

     the height of the antenna. I.e., about 2.6" for

     a transponder.



     Anything bigger, such as the 12" diameter is not

     a "tuned" ground plane in which case make it any

     size you wish. Anything bigger than the 2.6" radius

     is not going to significantly alter performance.

        Bob . . .



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

        ( . . .  a long habit of not thinking   )

        ( a thing wrong, gives it a superficial )

        ( appearance of being right . . .       )

        (                                       )

        (                  -Thomas Paine 1776-  )

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

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