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Shielding of audio signal wires, ARINC 129 wires

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alansbarnett(at)verizon.n
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Posted: Wed Jun 25, 2014 5:27 am Post subject: Shielding of audio signal wires, ARINC 129 wires

According to the Garmin GNS430W installation manual, the audio output 

wires should be shielded, with the shield grounded at one end.  In 

addition, the ARINC 129 should be shielded.



I bought a dynon d10a EFIS and pre-wired harness (before I learned how 

easy it is to wire the connectors).  In the pre-wired harness, the ARINC 

129 wires are twisted together, but not shielded. Furthermore, I would 

expect very little crosstalk at audio frequencies, so I wouldn't expect 

much benefit from shielding the audio wires.



Does anyone have experience with these issues?  Are shielded wires 

really necessary?

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