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Steve Glasgow
Joined: 10 Jan 2006
Posts: 674
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 Posted: Sun Jul 15, 2007 2:31 am Post subject: Connecting Shieled 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
[quote][b]
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Steve Glasgow-Cappy
Cappy's Toy
RV-8 N123SG |
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rjquillin
Joined: 13 May 2007
Posts: 123
Location: KSEE
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| Posted: Sun Jul 15, 2007 6:21 am Post subject: Connecting Shieled Wires |
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At 03:29 7/15/2007, you wrote:
| Quote: | 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?
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Without a bit more information, this can have a number of solutions,
but I believe one can safely say regarding microphone lines;
They should be one continuous run from the microphone source, or
jack, to the input of the amplifier. This does not preclude
intermediate connectors and cable segments, but the shield should
remain connected to itself throughout the length, and should not have
connections to other shields or the airframe except at a single
point, the input to the amplifier at the audio panel/intercom.
A shield cut and unattached at either end is no longer a shield.
Ron Q.
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nuckollsr(at)cox.net
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| Posted: Mon Jul 16, 2007 5:48 am Post subject: Connecting Shieled Wires |
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At 07:20 AM 7/15/2007 -0700, you wrote:
| Quote: |
At 03:29 7/15/2007, you 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?
Without a bit more information, this can have a number of solutions, but I
believe one can safely say regarding microphone lines;
They should be one continuous run from the microphone source, or jack, to
the input of the amplifier. This does not preclude intermediate
connectors and cable segments, but the shield should remain connected to
itself throughout the length, and should not have connections to other
shields or the airframe except at a single point, the input to the
amplifier at the audio panel/intercom.
A shield cut and unattached at either end is no longer a shield.
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Not quite true. Shields should be terminated as shown in
the installation wiring diagrams. Sometimes one end only is
connected, sometimes both ends. Follow directions. The only
time a shield ceases to function as intended is when BOTH
ends are floating.
If a shielded line needs to be taken through a
connector, give the shield it's own pin. I.e., a
shielded, twisted trio of wires takes 4 pins to
transition a connector.
Don't struggle to bring shields "up tight" against
the back of a connector housing. Exposing 2-3 inches
of "protected" conductors on a connector installation
is no big deal. Make all your shield terminations outside
the connector backshell so that only individual strands
of wire pass through the strain relief and into the
connector.
Bob . . .
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rjquillin
Joined: 13 May 2007
Posts: 123
Location: KSEE
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| Posted: Mon Jul 16, 2007 7:38 am Post subject: Connecting Shieled Wires |
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At 07:50 7/16/2007, you wrote:
My poor wording:
"unattached at either end" = not connected at either end.
I think we totally agree.
Ron.
| Quote: | >A shield cut and unattached at either end is no longer a shield.
Not quite true. Shields should be terminated as shown in
the installation wiring diagrams. Sometimes one end only is
connected, sometimes both ends. Follow directions. The only
time a shield ceases to function as intended is when BOTH
ends are floating.
|
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