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Balun for VOR antenna

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Gilles.Thesee(at)ac-greno
Guest

Posted: Sun Aug 30, 2009 12:44 am Post subject: Balun for VOR antenna

Bob and all,



While helping a friend wiring his airplane, I stumbled on the 

instruction leaflet for his RA-Miller VOR antenna. It calls for a 

specific built-in balun coax.

My intention was to follow the instructions in 

http://www.aeroelectric.com/articles/BALUN/Balun_Fabrication.html, but 

the coax already installed and bundled in the fuselage is RG 58.

To avoid crawling into the fuselage and doing everything again, is it 

doable to keep the RG 58, and WHEN and IF a balun is required, to add a 

portion of RG 400 with the balun via a pair of BNC connectors ?



Thanks in advance,



Best regards,

-- 

Gilles

http://contrails.free.fr

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nuckolls.bob(at)aeroelect
Guest

Posted: Sun Aug 30, 2009 8:07 am Post subject: Balun for VOR antenna

At 03:32 AM 8/30/2009, you wrote:

 	  Quote: 	
		  

<Gilles.Thesee(at)ac-grenoble.fr>



Bob and all,



While helping a friend wiring his airplane, I stumbled on the 

instruction leaflet for his RA-Miller VOR antenna. It calls for a 

specific built-in balun coax.

My intention was to follow the instructions in 

http://www.aeroelectric.com/articles/BALUN/Balun_Fabrication.html, 

but the coax already installed and bundled in the fuselage is RG 58.

To avoid crawling into the fuselage and doing everything again, is 

it doable to keep the RG 58, and WHEN and IF a balun is required, to 

add a portion of RG 400 with the balun via a pair of BNC connectors ?


	


    It is never "required". Thousands of airplanes

    were built in the 50's and 60's where the coax

    feedline to a VOR antenna "whiskers" were simply

    attached to the two antenna elements: center

    conductor to on, shield to the other. This is

    depicted on 'Connection drawings in the chapter

    on antennas.



    If I interpret the words describing the RA Miller

    AV12 antenna at:



http://www.aircraftspruce.com/catalog/avpages/av12L_ant.php



    it says that the balun is "integral to the coax supplied".

    I don't see how this is done in the data supplied.

    However, you're not on shaky ground to simply install

    per manufacturer's instructions using cable supplied. While

    not necessarily the best we know how to do, its performance

    will be entirely satisfactory.

        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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Gilles.Thesee(at)ac-greno
Guest

Posted: Sun Aug 30, 2009 11:44 am Post subject: Balun for VOR antenna

<nuckolls.bob(at)aeroelectric.com>



Thank you for your quick and comprehensive answer.



 	  Quote: 	
		      It is never "required". Thousands of airplanes

    were built in the 50's and 60's where the coax

    feedline to a VOR antenna "whiskers" were simply

    attached to the two antenna elements: center

    conductor to on, shield to the other.

This is what I did with RG 58.
	


 	  Quote: 	
		  

    However, you're not on shaky ground to simply install

    per manufacturer's instructions using cable supplied.


	


The problem is, the antenna was purchased with no cable.



Thanks again,

Best regards,

-- 

Gilles

http://contrails.free.fr

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Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:

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