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Belden Triax vs. Coax rg58

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davesh(at)techii.com
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Posted: Tue May 08, 2007 10:28 am Post subject: Belden Triax vs. Coax rg58

Glasair sells and installs Belden 9222 triax for the tail com antenna and for the wing tip nav antenna.  Everyone says rg400 is preferred over rg58, but is the triax a step up from the regular rg58 coax?  The triax is installed now for the #1 com tail antenna and nav antenna, but I bought more Belden 9222 triax for transponder, 2nd com, and marker antenna runs, should I scrap it and install rg 400?  

Thanks,  

Dave Shiffer  

   

        [quote][b]

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rjquillin(at)gmail.com
Guest

Posted: Tue May 08, 2007 11:12 am Post subject: Belden Triax vs. Coax rg58

At 11:24 5/8/2007, you wrote:



  	  Quote: 	
		  Glasair sells and installs Belden 9222 triax for the tail com antenna and for the wing tip nav antenna.  Everyone says rg400 is preferred over rg58, but is the triax a step up from the regular rg58 coax?  The triax is installed now for the #1 com tail antenna and nav antenna, but I bought more Belden 9222 triax for transponder, 2nd com, and marker antenna runs, should I scrap it and install rg 400?

 

 Thanks,

 

 Dave Shiffer 	


 Belden 9222 is double shielded coax.  Tinned copper conductors and PVC outer jacket

 RG-400 is double shielded coax.  Silver plated copper conductors with FEP Teflon outer jacket.



 The RG is MIL-17 rated, the 9222 is not.



 We used RG-400 doing a refurb of a certified A/C, and pulled out all the old PVC cable we could find.



 Ron Q.    [quote][b]

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mprather(at)spro.net
Guest

Posted: Tue May 08, 2007 12:11 pm Post subject: Belden Triax vs. Coax rg58

I don't think any of these cable types will perform appreciably different

for small airplane applications.  While the RG400 is more tolerant of high

temps, I don't think that's relevent for avionics signaling.  The RG400 is

supposed to be a bit more flexible than RG58, and since 9222 is triax, I

might guess that it's less flexible than RG58.



The RF performance of RG58 varies depending which part num you buy.  Some

of the "Low Loss" cable show somewhat better numbers, particularly at

transponder freq.  Even so, for the cable run lengths and considering the

power output of a healthy transponder, it's not an issue.



In any case, if you already have equipment installed using 9222, I'd leave

it, and if you have the cable and tools to use it for the rest of the

airplane, fine.  But, I wouldn't go out and buy tools for installing it. 

The connectors I saw for 9222 look bulky.  Might be a hassle in a cramped

space.



BTW, Belden lists 9222 as a type of RG58 even though it's triax.



BTW2, The RG400 I saw has a double layer braid shield, but since it

doesn't have a dielectric between the layers, it's not triax.

Regards,



Matt-

 	  Quote: 	
		   Glasair sells and installs Belden 9222 triax for the tail com antenna and

 for the wing tip nav antenna.  Everyone says rg400 is preferred over rg58,

 but is the triax a step up from the regular rg58 coax?  The triax is

 installed now for the #1 com tail antenna and nav antenna, but I bought

 more

 Belden 9222 triax for transponder, 2nd com, and marker antenna runs,

 should

 I scrap it and install rg 400?



 Thanks,



 Dave Shiffer

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nuckollsr(at)cox.net
Guest

Posted: Wed May 09, 2007 7:15 am Post subject: Belden Triax vs. Coax rg58

At 02:24 PM 5/8/2007 -0400, you wrote:



 	  Quote: 	
		  Glasair sells and installs Belden 9222 triax for the tail com antenna and 

for the wing tip nav antenna.  Everyone says rg400 is preferred over rg58, 

but is the triax a step up from the regular rg58 coax?  The triax is 

installed now for the #1 com tail antenna and nav antenna, but I bought 

more Belden 9222 triax for transponder, 2nd com, and marker antenna runs, 

should I scrap it and install rg 400?



Thanks,



Dave Shiffer


	


     If your connectors are compatible with the 9222, I'd

     say leave it in. But I think RG-400 has superior insulation

     material and is compatible with tools and connectors

     designed for RG-58. I'm mystified as to why anyone would

     offer this relatively odd-ball material except perhaps

     for some homage being paid to a hangar-legend.



     RG-400 and close cousins are the coax of choice in

     the aircraft industry and recommended for all new

    construction.



     Bob . . .



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

        ( IF one aspires to be "world class",  )

        ( what ever you do must be exercised   )

        ( EVERY day . . .                      )

        (                  R. L. Nuckolls III  )

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

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