---------------------------------------------------------- RVSouthEast-List Digest Archive --- Total Messages Posted Sun 07/15/07: 8 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 03:27 AM - Connecting Shielded Wires (Steve Glasgow) 2. 07:02 AM - Re: Connecting Shielded Wires (Radomir Zaric) 3. 07:13 AM - Re: Connecting Shielded Wires (Charlie England) 4. 10:14 AM - Re: Connecting Shielded Wires (Steve Glasgow) 5. 10:38 AM - Re: Connecting Shielded Wires (Radomir Zaric) 6. 10:44 AM - Re: Connecting Shielded Wires (Steve Glasgow) 7. 12:50 PM - Re: Connecting Shielded Wires (Charlie England) 8. 02:34 PM - Re: Connecting Shielded Wires (Steve Glasgow) ________________________________ Message 1 _____________________________________ Time: 03:27:55 AM PST US From: "Steve Glasgow" Subject: RVSouthEast-List: Connecting Shielded Wires I'm looking for information about connecting two shielded wires together. Example inputs from other sources to a PMA 8000 audio panel: Should the shields be butt spliced along with the other wires into a one big mess? Should all wires and shields be connected with Sub D connectors? Should the shields be left cut and unattached? Are there other methods? Thanks in advance for any input. Steve Glasgow-Cappy N123SG RV-8 Cappy's Toy ________________________________ Message 2 _____________________________________ Time: 07:02:58 AM PST US From: "Radomir Zaric" Subject: RE: RVSouthEast-List: Connecting Shielded Wires Cappy, I'd daisy chain 'em together... probably would be easiest way. Something like this: http://www.aeroelectric.com/articles/pigtail/pigtail.html HTH Radomir -----Original Message----- From: owner-rvsoutheast-list-server@matronics.com [mailto:owner-rvsoutheast-list-server@matronics.com] On Behalf Of Steve Glasgow Sent: Sunday, July 15, 2007 6:27 AM Subject: RVSouthEast-List: Connecting Shielded Wires I'm looking for information about connecting two shielded wires together. Example inputs from other sources to a PMA 8000 audio panel: Should the shields be butt spliced along with the other wires into a one big mess? Should all wires and shields be connected with Sub D connectors? Should the shields be left cut and unattached? Are there other methods? Thanks in advance for any input. Steve Glasgow-Cappy N123SG RV-8 Cappy's Toy ________________________________ Message 3 _____________________________________ Time: 07:13:46 AM PST US From: Charlie England Subject: Re: RVSouthEast-List: Connecting Shielded Wires Steve Glasgow wrote: > > > I'm looking for information about connecting two shielded wires together. > > Example inputs from other sources to a PMA 8000 audio panel: > Should the shields be butt spliced along with the other wires into a one > big > mess? > Should all wires and shields be connected with Sub D connectors? > Should the shields be left cut and unattached? > Are there other methods? > > Thanks in advance for any input. > > Steve Glasgow-Cappy > N123SG RV-8 > Cappy's Toy One (general good practices) technique is to strip the cable back a few inches, cut the shield back, solder a short length of stranded wire to the shield & cover the joint with heat shrink tubing. That way, you just have 2 small wires to put in the sub D connector, instead of the big mass of the shield. Loss of shielding is minimal at the impedances of modern audio stuff. If you gather all the shields & tie them together instead of bringing each shield wire into the connector, it might work fine but it might not. It depends on what each shield is doing & how the various components 'relate' to each other. Much smaller chance of setting up 'ground loops' (noise inducing multiple ground paths) if you carry each shield to its recommended termination point. If you get an answer from the aeroelectric list, I'd expect it to sound something like that. Charlie ________________________________ Message 4 _____________________________________ Time: 10:14:41 AM PST US From: "Steve Glasgow" Subject: Re: RVSouthEast-List: Connecting Shielded Wires Thanks Rad and Charlie. The aeroelectric method is what I was thinking of doing but there are some special connectors that you heat shrink that accomplish the same thing and are much easier to use. But I can't find where to buy them. I have at least 7 of these type connections to make. Some with 4 and some with 2 inner wires. Would you use one Sub D for each or pet them together in say two Sub D connectors? Cappy ----- Original Message ----- From: Radomir Zaric To: rvsoutheast-list@matronics.com Sent: Sunday, July 15, 2007 10:03 AM Subject: RE: RVSouthEast-List: Connecting Shielded Wires Cappy, I'd daisy chain 'em together... probably would be easiest way. Something like this: http://www.aeroelectric.com/articles/pigtail/pigtail.html HTH Radomir -----Original Message----- From: owner-rvsoutheast-list-server@matronics.com [mailto:owner-rvsoutheast-list-server@matronics.com] On Behalf Of Steve Glasgow Sent: Sunday, July 15, 2007 6:27 AM To: SERV Subject: RVSouthEast-List: Connecting Shielded Wires I'm looking for information about connecting two shielded wires together. Example inputs from other sources to a PMA 8000 audio panel: Should the shields be butt spliced along with the other wires into a one big mess? Should all wires and shields be connected with Sub D connectors? Should the shields be left cut and unattached? Are there other methods? Thanks in advance for any input. Steve Glasgow-Cappy N123SG RV-8 Cappy's Toy ________________________________ Message 5 _____________________________________ Time: 10:38:09 AM PST US From: "Radomir Zaric" Subject: RE: RVSouthEast-List: Connecting Shielded Wires Cappy, Digikey has 'em. Search for SolderSleeve on www.digikey.com Tyco has technical info for those.. that may help picking the right selection. http://catalog.tycoelectronics.com/TE/bin/TE.Connect?C=15757 &M=FEAT&&I=44&LG=1 If they're all going to same place, I'd just daisy chain 'em w/o using DSub connectors. However, since this is essentially ground for induced electricity, I don't think they need to be all bundled up in exactly same spot (if you have a choice of several places).. you could split 'em up into two-three places on the chassis of the device. (sorry, not familiar with that audio panel.. so all this may not apply). PS. As I understand, though, you don't need/want to connect those at both ends of the wire. only on one side. From: owner-rvsoutheast-list-server@matronics.com [mailto:owner-rvsoutheast-list-server@matronics.com] On Behalf Of Steve Glasgow Sent: Sunday, July 15, 2007 1:14 PM Subject: Re: RVSouthEast-List: Connecting Shielded Wires Thanks Rad and Charlie. The aeroelectric method is what I was thinking of doing but there are some special connectors that you heat shrink that accomplish the same thing and are much easier to use. But I can't find where to buy them. I have at least 7 of these type connections to make. Some with 4 and some with 2 inner wires. Would you use one Sub D for each or pet them together in say two Sub D connectors? Cappy ________________________________ Message 6 _____________________________________ Time: 10:44:07 AM PST US From: "Steve Glasgow" Subject: Re: RVSouthEast-List: Connecting Shielded Wires Thanks Rad. That is the one. Very expensive. I'm back to Sub D connectors. Cappy ----- Original Message ----- From: Radomir Zaric To: rvsoutheast-list@matronics.com Sent: Sunday, July 15, 2007 1:37 PM Subject: RE: RVSouthEast-List: Connecting Shielded Wires Cappy, Digikey has 'em. Search for SolderSleeve on www.digikey.com Tyco has technical info for those.. that may help picking the right selection. http://catalog.tycoelectronics.com/TE/bin/TE.Connect?C=15757&M=FEAT&& I=44&LG=1 If they're all going to same place, I'd just daisy chain 'em w/o using DSub connectors. However, since this is essentially ground for induced electricity, I don't think they need to be all bundled up in exactly same spot (if you have a choice of several places).. you could split 'em up into two-three places on the chassis of the device. (sorry, not familiar with that audio panel.. so all this may not apply). PS. As I understand, though, you don't need/want to connect those at both ends of the wire. only on one side. From: owner-rvsoutheast-list-server@matronics.com [mailto:owner-rvsoutheast-list-server@matronics.com] On Behalf Of Steve Glasgow Sent: Sunday, July 15, 2007 1:14 PM To: rvsoutheast-list@matronics.com Subject: Re: RVSouthEast-List: Connecting Shielded Wires Thanks Rad and Charlie. The aeroelectric method is what I was thinking of doing but there are some special connectors that you heat shrink that accomplish the same thing and are much easier to use. But I can't find where to buy them. I have at least 7 of these type connections to make. Some with 4 and some with 2 inner wires. Would you use one Sub D for each or pet them together in say two Sub D connectors? Cappy ________________________________ Message 7 _____________________________________ Time: 12:50:33 PM PST US From: Charlie England Subject: Re: RVSouthEast-List: Connecting Shielded Wires Are you extending some existing wires? If so, I'd give each shield its own pin in the connector (using the pigtail shown in the aeroelectric link). If you start combining grounds for ins & outs anywhere but at the panel itself, you're asking for problems with noise. Some of the various posts mentioned grounding one end or grounding both ends. Some of the advice might or might not be correct, depending on how the shield is used. In unbalanced audio circuits, the shield is also the return path for the electrons. In balanced circuits, there will be 2 wires surrounded by the shield and all the shield does is shield (doesn't supply the return path). Some stuff needs the shield grounded at both ends (a typical antenna coax feeding a 1/4 wave whip antenna mounted on the belly of an RV-x) & some should only be grounded at one end (magneto p-leads). Are we having fun yet? Charlie Steve Glasgow wrote: > Thanks Rad and Charlie. The aeroelectric method is what I was thinking > of doing but there are some special connectors that you heat shrink that > accomplish the same thing and are much easier to use. But I can't find > where to buy them. > > I have at least 7 of these type connections to make. Some with 4 and > some with 2 inner wires. Would you use one Sub D for each or pet them > together in say two Sub D connectors? > > Cappy > > ----- Original Message ----- > > *From:* Radomir Zaric > *To:* rvsoutheast-list@matronics.com > > *Sent:* Sunday, July 15, 2007 10:03 AM > *Subject:* RE: RVSouthEast-List: Connecting Shielded Wires > > > > > Cappy, > > I'd daisy chain 'em together... probably would be easiest way. > Something > like this: > > http://www.aeroelectric.com/articles/pigtail/pigtail.html > > > > > HTH > Radomir > > > > > -----Original Message----- > From: owner-rvsoutheast-list-server@matronics.com > > [mailto:owner-rvsoutheast-list-server@matronics.com] On Behalf Of Steve > Glasgow > Sent: Sunday, July 15, 2007 6:27 AM > To: SERV > Subject: RVSouthEast-List: Connecting Shielded Wires > > > > > I'm looking for information about connecting two shielded wires > together. > > Example inputs from other sources to a PMA 8000 audio panel: > Should the shields be butt spliced along with the other wires into a > one big > mess? > Should all wires and shields be connected with Sub D connectors? > Should the shields be left cut and unattached? > Are there other methods? > > Thanks in advance for any input. > > Steve Glasgow-Cappy > N123SG RV-8 > Cappy's Toy nbsp; Features Subscriptions > href="http://www.matronics.com/Navigator?RVSouthEast-List">http://www.mp; > available via > href="http://forums.matronics.com">http://forums.matronics.com > > > * > > > * > > > ------------------------------------------------------------------------ > ________________________________ Message 8 _____________________________________ Time: 02:34:26 PM PST US From: "Steve Glasgow" Subject: Re: RVSouthEast-List: Connecting Shielded Wires Thanks Charlie. That is what I will do. No they are new wires. I'm helping Randy Utsey with his RV7. The wires are from 430 to stuff, Audio inputs, Transponders, ETC. I will do the ones with 4 wires inside the shield in a 9 pin Sub D. The ones with only 2 wires inside the sidled I will do with 2 in one 9 pin Sub D. Many are grounded to the units so I will only hook one shield to its mate and not daisy chain them together. Cappy ----- Original Message ----- From: Charlie England To: rvsoutheast-list@matronics.com Sent: Sunday, July 15, 2007 3:50 PM Subject: Re: RVSouthEast-List: Connecting Shielded Wires Are you extending some existing wires? If so, I'd give each shield its own pin in the connector (using the pigtail shown in the aeroelectric link). If you start combining grounds for ins & outs anywhere but at the panel itself, you're asking for problems with noise. Some of the various posts mentioned grounding one end or grounding both ends. Some of the advice might or might not be correct, depending on how the shield is used. In unbalanced audio circuits, the shield is also the return path for the electrons. In balanced circuits, there will be 2 wires surrounded by the shield and all the shield does is shield (doesn't supply the return path). Some stuff needs the shield grounded at both ends (a typical antenna coax feeding a 1/4 wave whip antenna mounted on the belly of an RV-x) & some should only be grounded at one end (magneto p-leads). Are we having fun yet? Charlie Steve Glasgow wrote: > Thanks Rad and Charlie. The aeroelectric method is what I was thinking > of doing but there are some special connectors that you heat shrink that > accomplish the same thing and are much easier to use. But I can't find > where to buy them. > > I have at least 7 of these type connections to make. Some with 4 and > some with 2 inner wires. Would you use one Sub D for each or pet them > together in say two Sub D connectors? > > Cappy > > ----- Original Message ----- > > *From:* Radomir Zaric > *To:* rvsoutheast-list@matronics.com > > *Sent:* Sunday, July 15, 2007 10:03 AM > *Subject:* RE: RVSouthEast-List: Connecting Shielded Wires > > > > > Cappy, > > I'd daisy chain 'em together... probably would be easiest way. > Something > like this: > > http://www.aeroelectric.com/articles/pigtail/pigtail.html > > > > > HTH > Radomir > > > > > -----Original Message----- > From: owner-rvsoutheast-list-server@matronics.com > > [mailto:owner-rvsoutheast-list-server@matronics.com] On Behalf Of Steve > Glasgow > Sent: Sunday, July 15, 2007 6:27 AM > To: SERV > Subject: RVSouthEast-List: Connecting Shielded Wires > > > > > I'm looking for information about connecting two shielded wires > together. > > Example inputs from other sources to a PMA 8000 audio panel: > Should the shields be butt spliced along with the other wires into a > one big > mess? > Should all wires and shields be connected with Sub D connectors? > Should the shields be left cut and unattached? > Are there other methods? > > Thanks in advance for any input. > > Steve Glasgow-Cappy > N123SG RV-8 > Cappy's Toy nbsp; Features Subscriptions > href="http://www.matronics.com/Navigator?RVSouthEast-List">http://www.m p; > available via > href="http://forums.matronics.com">http://forums.matronics.com > > > * > > > * > > > ------------------------------------------------------------------------ > ------------------------------------------------------------------------------------- Other Matronics Email List Services ------------------------------------------------------------------------------------- Post A New Message rvsoutheast-list@matronics.com UN/SUBSCRIBE http://www.matronics.com/subscription List FAQ http://www.matronics.com/FAQ/RVSouthEast-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/rvsoutheast-list Browse Digests http://www.matronics.com/digest/rvsoutheast-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.