---------------------------------------------------------- Avionics-List Digest Archive --- Total Messages Posted Wed 06/25/14: 3 ---------------------------------------------------------- Today's Message Index: ---------------------- 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 _____________________________________ Time: 12:28:17 AM PST US Subject: Avionics-List: Collision avoidance From: "spcialeffects" 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 ________________________________ Message 2 _____________________________________ Time: 06:27:24 AM PST US From: Alan Barnett Subject: Avionics-List: 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 _____________________________________ Time: 07:18:56 AM PST US From: Tim Andres Subject: Avionics-List: 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 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? > > ------------------------------------------------------------------------------------- Other Matronics Email List Services ------------------------------------------------------------------------------------- Post A New Message avionics-list@matronics.com UN/SUBSCRIBE http://www.matronics.com/subscription List FAQ http://www.matronics.com/FAQ/Avionics-List.htm Web Forum Interface To Lists http://forums.matronics.com Matronics List Wiki http://wiki.matronics.com Full Archive Search Engine http://www.matronics.com/search 7-Day List Browse http://www.matronics.com/browse/avionics-list Browse Digests http://www.matronics.com/digest/avionics-list Browse Other Lists http://www.matronics.com/browse Live Online Chat! http://www.matronics.com/chat Archive Downloading http://www.matronics.com/archives Photo Share http://www.matronics.com/photoshare Other Email Lists http://www.matronics.com/emaillists Contributions http://www.matronics.com/contribution ------------------------------------------------------------------------------------- These Email List Services are sponsored solely by Matronics and through the generous Contributions of its members.