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Coax Mixing RG-400 and RG58

 
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PostPosted: Wed Jan 27, 2021 2:37 pm    Post subject: Coax Mixing RG-400 and RG58 Reply with 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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PostPosted: Wed Jan 27, 2021 2:47 pm    Post subject: Coax Mixing RG-400 and RG58 Reply with 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.  Worst 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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Kellym



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PostPosted: Wed Jan 27, 2021 4:06 pm    Post subject: Coax Mixing RG-400 and RG58 Reply with quote

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.
Worst 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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Joined: 28 Mar 2008
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PostPosted: Wed Jan 27, 2021 5:23 pm    Post subject: Re: Coax Mixing RG-400 and RG58 Reply with quote

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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PostPosted: Wed Jan 27, 2021 6:36 pm    Post subject: Coax Mixing RG-400 and RG58 Reply with quote

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. Worst 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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