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Coax Mixing RG-400 and RG58

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email(at)jaredyates.com
Guest

Posted: Wed Jan 27, 2021 2:37 pm Post subject: Coax Mixing RG-400 and RG58

My hangar neighbor's airplane already has rg58 for the transponder antenna, but it is 15 inches short. I happen to have a piece that would fix it, bit it is RG400. Is there any problem running the two different types of cable in the same feed? Do we need to try and round up a piece of RG58 instead?

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Ceengland

Joined: 11 Oct 2020
Posts: 391
Location: MS

Posted: Wed Jan 27, 2021 2:47 pm Post subject: Coax Mixing RG-400 and RG58

Same impedance, so I know that *I'd* certainly try it (using the proper connectors), before ordering a 2' jumper or re-running the whole thing.Â  WorstÂ case scenario would be ATC telling you it isn't working.

Charlie

On Wed, Jan 27, 2021 at 4:42 PM Jared Yates <email(at)jaredyates.com (email(at)jaredyates.com)> wrote:



 	  Quote: 	
		      My hangar neighbor's airplane already has rg58 for the transponder antenna, but it is 15 inches short. I happen to have a piece that would fix it, bit it is RG400. Is there any problem running the two different types of cable in the same feed? Do we need to try and round up a piece of RG58 instead?

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_________________
Charlie

Kellym

Joined: 10 Jan 2006
Posts: 1705
Location: Sun Lakes AZ

Posted: Wed Jan 27, 2021 4:06 pm Post subject: Coax Mixing RG-400 and RG58

I don't know precise years, but RG-400 came along sometime after I put a 

transponder in my first airplane, in the mid-80s. Back then RG-58 was 

used for every antenna, except some pricier airplanes used a couple 

other 75 ohm cables with more insulation between core and shield. 

(RG174? I think). RG-400 is better for DME, transponders and GPS that 

operate above 900 Mhz, but RG-58 worked okay.



On 1/27/2021 3:39 PM, Charlie England wrote:

 	  Quote: 	
		   Same impedance, so I know that *I'd* certainly try it (using the proper 

 connectors), before ordering a 2' jumper or re-running the whole thing.  

 WorstÂ case scenario would be ATC telling you it isn't working.

 

 Charlie

 

 On Wed, Jan 27, 2021 at 4:42 PM Jared Yates <email(at)jaredyates.com 

 <mailto:email(at)jaredyates.com>> wrote:

 

     __

     My hangar neighbor's airplane already has rg58 for the transponder

     antenna, but it is 15 inches short. I happen to have a piece that

     would fix it, bit it is RG400. Is there any problem running the two

     different types of cable in the same feed? Do we need to try and

     round up a piece of RG58 instead?

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_________________
Kelly McMullen
A&P/IA, EAA Tech Counselor # 5286
KCHD

user9253

Joined: 28 Mar 2008
Posts: 1927
Location: Riley TWP Michigan

Posted: Wed Jan 27, 2021 5:23 pm Post subject: Re: Coax Mixing RG-400 and RG58

When faced with a decision like this, do what is best in the long run, not what is easiest or least expensive.

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Joe Gores

nuckolls.bob(at)aeroelect
Guest

Posted: Wed Jan 27, 2021 6:36 pm Post subject: Coax Mixing RG-400 and RG58

At 04:39 PM 1/27/2021, you wrote:

  	  Quote: 	
		  Same impedance, so I know that *I'd* certainly try it (using the proper connectors), before ordering a 2' jumper or re-running the whole thing.Â  WorstÂ case scenario would be ATC telling you it isn't working. 	


    Agreed. There are no performance risks for extending

    the original run of coax with a more modern material

    as long as the connectors are appropriate to the

    wire and in good shape.



 

   Bob . . .



   Un impeachable logic: George Carlin asked, "If black boxes

   survive crashes, why don't they make the whole airplane

   out of that stuff?"

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