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Balum Construction

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currydon(at)bellsouth.net
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Posted: Sun Mar 22, 2009 10:41 am Post subject: Balum Construction

Can RG-400 coax be used to build a balum for a whisker-type VOR antenna? Don

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jetboy

Joined: 22 Jul 2006
Posts: 233

Posted: Sun Mar 22, 2009 1:20 pm Post subject: Re: Balum Construction

yes but it wont perform any different to a balun made from RG58 or RG316, providing you cut the length proportional to the particular vf of the cable used.



Ralph

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Ralph - CH701 / 2200a

currydon(at)bellsouth.net
Guest

Posted: Sun Mar 22, 2009 1:41 pm Post subject: Balum Construction

 	  Quote: 	
		   providing you cut the length proportional to the particular vf of the

cable used.
	




So just copying the dimensions of the old balum (which was made of RG58)

won't work?  How do you figure the vf of RG400 and how do you convert that

information into info useful in determining the lengths of the various

segments of the new RG400 balum?  Or is there a standard template with

lengths for making a balum from RG400?



[quote] --

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nuckolls.bob(at)aeroelect
Guest

Posted: Mon Mar 23, 2009 3:46 pm Post subject: Balum Construction

At 01:37 PM 3/22/2009, you wrote:

 	  Quote: 	
		  



Can RG-400 coax be used to build a balum for a whisker-type VOR antenna? Don


	


    400 is the preferred material. This modern coax easily

    withstands soldering temperatures. See:



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



http://www.aeroelectric.com/Reference_Docs/Antenna/BALUN_Analysis.pdf



http://www.aeroelectric.com/PPS/Antenna/VOR-LOC_ANT_w_BALUN.pdf



http://www.aeroelectric.com/articles/Antennas/Popular_Antenna_Lore.pdf





        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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nuckolls.bob(at)aeroelect
Guest

Posted: Mon Mar 23, 2009 3:55 pm Post subject: Balum Construction

At 04:39 PM 3/22/2009, you wrote:

 	  Quote: 	
		  



 > providing you cut the length proportional to the particular vf of the

cable used.



So just copying the dimensions of the old balum (which was made of RG58)

won't work?  How do you figure the vf of RG400 and how do you convert that

information into info useful in determining the lengths of the various

segments of the new RG400 balum?  Or is there a standard template with

lengths for making a balum from RG400?


	


   The BALUN shown on my website is cut for 1/4-wave

   in free space. The coax velocity factor is not

   a driver for fabricating this version, hence any

   coax can be used. However, attempting to solder to

   RG58 with those WWII plastics can be a challenge.

        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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currydon(at)bellsouth.net
Guest

Posted: Mon Mar 23, 2009 4:24 pm Post subject: Balum Construction

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kuffel(at)cyberport.net
Guest

Posted: Tue Mar 24, 2009 8:42 pm Post subject: Balum Construction

To expand what Bob said:



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



The BALUN shown on my website is cut for 1/4-wave  in free space >>



The velocity factor for RG-400 is 0.70 (for RG-58 it's 0.66).  This means a 

signal travels at 70% the speed of light in free space.  Thus Bob's 1/4 wave 

length of 26" is correct for the horizontal antenna lines (velocity factor 

of about 0.9 but the coax balun length should be reduced by a factor of 

0.70, that is a length of 18 1/4".



Tom Kuffel

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