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RG-400 vs. RG-142?

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a.s.elliott(at)cox.net
Guest

Posted: Wed Mar 05, 2008 8:12 am Post subject: RG-400 vs. RG-142?

I know that has been discussed before, but I want to be sure.  Are  there any significant downsides to using RG-142 for aircraft antenna  applications where the cable will not be regularly flexed (except for normal  vibration)?  I am somewhat leery of using a solid core coax.

  

 Andy Elliott, Mesa, AZ

N601GE (reserved)

601XL/TD, Corvair,  building...

   [quote][b]

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nuckolls.bob(at)cox.net
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Posted: Wed Mar 05, 2008 12:33 pm Post subject: RG-400 vs. RG-142?

At 09:00 AM 3/5/2008 -0700, you wrote:



 	  Quote: 	
		  I know that has been discussed before, but I want to be sure.  Are there 

any significant downsides to using RG-142 for aircraft antenna 

applications where the cable will not be regularly flexed (except for 

normal vibration)?  I am somewhat leery of using a solid core coax.


	


   Then use the stranded version, RG-400.



   RG-58 in the lengths we common use for small

   airplanes does not present a significant

   performance impact. However, the materials

   from which RG-58 is made and the technology

   behind the design of the coax is now over 60

   years old.



   See:



http://www.aeroelectric.com/Pictures/Curves/coaxloss1.pdf



   Consider a 10' run of coax from GPS receiver

   to antenna. RG58 offers an attenuation of about

   35db/100'; RG-400/142 is about 24db/100'.

   10' runs reduce to 3.5 and 2.4 db for a difference

   of 1.3 db . . . delta that is impossible to

   observe and difficult to measure at that frequency.



   With respect to materials,  RG-400/142 are double-

   layer, silver-plated shield and fabricated from

   modern cousins to Teflon. It's the best we know how

   to do  . . . today.



   Bob . . .

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gmcjetpilot

Joined: 04 Nov 2006
Posts: 170

Posted: Thu Mar 06, 2008 11:53 am Post subject: RG-400 vs. RG-142?

 	  Quote: 	
		  From: "Robert L. Nuckolls, III" <nuckolls.bob(at)cox.net (nuckolls.bob(at)cox.net)>

Subject: Re: RG-400 vs. RG-142?

 	  Quote: 	
		  >any significant downsides to using RG-142 for aircraft antenna 

>applications where the cable will not be regularly flexed (except

> for normal vibration)?  I am somewhat leery of using a solid core 

>coax.

  >Then use the stranded version, RG-400.

  Bob is right but you can get stranded versions of many coxial 

cables if you know where to look. The best thing recommending 

RG-58 (which can be had stranded) is its easier to find. Cost? 

RG-400 is spendy but when you look at cost of plane and avionics 

it's nickles and dimes. I still would not criticize you for using RG-58 

but at least look for stranded.

  RG-400 prices have come down to $1.85/ft.  cost difference small.

SCORE! http://www.steinair.com/wire.htm has RG-400 for $1.85/ft.

B&C also has a the same price.

  I know you don't need 500ft of RG-58 stranded but this is $0.23/ft

http://www.pacificcable.com/Picture_Page.asp?DataName=RG58AU

It does show RG-58 comes in stranded.

  There are many RG-58 equiv on the market but RG-400 is king, 

but be careful RG-400 comes in solid and stranded as well. Get 

stranded; why not? Not sure RG-142 comes in stranded?

  G

        Be a better friend, newshound, and   [quote][b]

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