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"Poor Man's" coax termination with RG-400

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nuckolls.bob(at)cox.net
Guest

Posted: Thu Mar 06, 2008 11:35 am Post subject: "Poor Man's" coax termination with RG-400

At 01:18 PM 3/6/2008 -0500, you wrote:



 	  Quote: 	
		  Bob,



Sorry I didn't explain it very well.



My buddy wants to use RG-400 for his VHF COMM. He has one of those 

antennas that has only a Delrin insulator and the end of the antenna is 

threaded. He currently has some old RG-58 which is installed according to 

the 'Connection, Chapter 13, The "Poor Man's" coax termination in lieu of 

a BNC connector, which is not an option with this antenna.



He was wondering if he should just twist the two layers of (RG-400) braid 

into one "wire" and crimp on a lug like the previous (RG-5 install. I 

was wondering if the outer (RG-400) braid should be trimmed short and only 

the inner braid teased out for crimping onto the ground lug. Or does it 

even matter?



Sorry for the misdirect.


	


   That's what I thought . . . and the technique described

   in the link I provided at:



http://aeroelectric.com/articles/shldwire/shldwire.html



   is what I would suggest. If you pull the center conductor

   through the side of BOTH shields, then there's no "twisting"

   necessary. The braid conductors are already grouped together

   in a manner that's conducive to installation of a terminal.



   The rule of thumb is to keep the coax pigtails as short

   as practical and know that the short length of exposed

   center conductor will cause an electrical "lengthening"

   of the antenna. This will shift the antenna's center-frequency

   down a Mhz or so . . . not generally a 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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rgf(at)dcn.davis.ca.us
Guest

Posted: Thu Mar 06, 2008 5:02 pm Post subject: "Poor Man's" coax termination with RG-400

While we're on the topic of coax and RG-400....what would you guys recommend

as to a wire stripper tool?  I got the Ideal Stripmaster for stripping

regular wire but need something for coax.



And while we're on wire...what would you recommend for a crimper?



Thanks,

Ralph Finch

Davis CA

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