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Steve Glasgow
Joined: 10 Jan 2006
Posts: 674
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 Posted: Sun Jul 15, 2007 2:27 am Post subject: Connecting Shielded Wires |
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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
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Steve Glasgow-Cappy
Cappy's Toy
RV-8 N123SG |
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vitez(at)carolina.rr.com
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ceengland(at)bellsouth.ne
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| Posted: Sun Jul 15, 2007 6:13 am Post subject: Connecting Shielded Wires |
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Steve Glasgow wrote:
| Quote: |
<willfly(at)carolina.rr.com>
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
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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
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Steve Glasgow
Joined: 10 Jan 2006
Posts: 674
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| Posted: Sun Jul 15, 2007 9:14 am Post subject: Connecting Shielded Wires |
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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
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Steve Glasgow-Cappy
Cappy's Toy
RV-8 N123SG |
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vitez(at)carolina.rr.com
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| Posted: Sun Jul 15, 2007 9:38 am Post subject: Connecting Shielded Wires |
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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(at)matronics.com [mailto:owner-rvsoutheast-list-server(at)matronics.com] On Behalf Of Steve Glasgow
Sent: Sunday, July 15, 2007 1:14 PM
To: rvsoutheast-list(at)matronics.com
Subject: Re: 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
[quote][b]
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Steve Glasgow
Joined: 10 Jan 2006
Posts: 674
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| Posted: Sun Jul 15, 2007 9:44 am Post subject: Connecting Shielded Wires |
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Thanks Rad. That is the one. Very expensive. I'm back to Sub D connectors.
Cappy
[quote] ---
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Steve Glasgow-Cappy
Cappy's Toy
RV-8 N123SG |
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ceengland(at)bellsouth.ne
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| Posted: Sun Jul 15, 2007 11:50 am Post subject: Connecting Shielded Wires |
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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:
[quote] 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
---
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Steve Glasgow
Joined: 10 Jan 2006
Posts: 674
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| Posted: Sun Jul 15, 2007 1:34 pm Post subject: Connecting Shielded Wires |
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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
[quote] ---
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Steve Glasgow-Cappy
Cappy's Toy
RV-8 N123SG |
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