Today's Message Index:
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1. 12:28 AM - Collision avoidance (spcialeffects)
2. 06:27 AM - Shielding of audio signal wires, ARINC 129 wires (Alan Barnett)
3. 07:18 AM - Re: COZY: Shielding of audio signal wires, ARINC 129 wires (Tim Andres)
Message 1
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| Subject: | Collision avoidance |
So I'm still thinking about putting my panel together and an avoidance system is
on my list. My gps and display are both dynon and so want something which will
integrate well with them. I have settled on the TRX-1500, which has been tested
with the dynon skyview system. I just wanted to know if anyone on the forum
has this set up or use the TRX-1500 or if you had about 1000ish what would
you buy? Many thanks Frank
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=425432#425432
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| 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?
Message 3
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| Subject: | Re: COZY: Shielding of audio signal wires, ARINC 129 wires |
Yes you should use shielded wire, buy 2 or 3 conductor wire as needed since you
never use the shield as audio low AND you never ground the shield at both ends
even accidentally as Nick pointed out the need for insulating washers on the
headphone jacks if installed on a conductive panel. Typically the shields are
grounded at the audio panel. 'Lectric Bob has some great pics on his web site
on how to treat the shield grounds, daisy chain them and get them cleanly into
D-sub pins. You may also run into different terms for "audio low" among the
various mfg's.
Also, suggest you convert the shields to wire just out side the D-sub hood since
the completed bundle usually grows too big to fit inside the hood on the audio
panel end.
PSE once had a ppt. on their web site that that gave some good detail on how to
do this. I just looked and didn't see it but I believe I have a copy of it if
you want.
Tim Andres
> On Jun 25, 2014, at 6:26 AM, Alan Barnett <alansbarnett@verizon.net> wrote:
>
> 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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