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Garmin 327 XPDR Cable & Artex me406 ELT cable

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jeffrey_davidson(at)earth
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Posted: Sat May 26, 2007 5:15 pm Post subject: Garmin 327 XPDR Cable & Artex me406 ELT cable

 	  Quote: 	
		  All,        In January Bob wrote:  "Coax cable length should be minimized for the lengths commonly used in light aircraft, both type of cable and variability in length will have no observable effect on performance.", but the Garmin GTX 327 Installation Manual has a list of recommended Antenna Cable Types by length on page 9.  They sure imply that it is critical.  For the 12.5 foot length I need, Garmin recommends either RG304 or M17/112.  Let me just say the RG304 seems to be scarce.  They do say that any 50 ohm, double shielded cable may be used, provided it introduces less that 1.5 dB attenuation at 1 ghz including the connector.  It is worth asking what that means and how to measure it?  What is being used successfully in the real world?  RG400?  Jim Wier seems to still prefer RG58!      The Artex installation instructions call for 5 conductor shielded cable either 22 AWG or 24 AWG.  Since no vendor seems to carry this cable, others must be using some thing else.  I did find 4 conductor shielded cable on B&C.   Anyone have a source or recommendation?            Thanks …   Jeff DavidsonWiring up my CH601-HD/Jabiru 3300/Dynon & Garmin avionics  	
  

   

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jeffrey_davidson(at)earth
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Posted: Sun May 27, 2007 3:17 pm Post subject: Garmin 327 XPDR Cable & Artex me406 ELT cable

Bob,

	Working with the calculator and talking to an electrical engineer

here I pretty much got an understanding of attenuation for practical

purposes.  I got a lead on a "sample" of RG304 that the engineer might be

able to locate.  Four conductor double shielded cable will work for the

Artex ELT, so I'll go that route.  The shield the then used as the ground

connector per the Artex installation instructions.  As others go the 406

route and the February 2009 date gets closer, I suspect that demand will

grow.  Again, thanks for the reply on a holiday weekend.  Please enjoy your

Memorial Day.

	Jeff Davidson

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