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Headset and mic shield question

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rparigoris

Joined: 24 Nov 2009
Posts: 791

Posted: Mon Jul 05, 2010 8:55 am Post subject: Headset and mic shield question

My 2 place Europa has a PS audio panel. I need to route shielded headset and mic wires out the port side of instrument module through a D-sub connector.



Curiosity question, what would happen if the shields were connected at the D-sub?



Thx.

Ron Parigoris

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nuckolls.bob(at)aeroelect
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Posted: Mon Jul 05, 2010 10:09 am Post subject: Headset and mic shield question

At 11:55 AM 7/5/2010, you wrote:

 	  Quote: 	
		  

<rparigor(at)suffolk.lib.ny.us>



My 2 place Europa has a PS audio panel. I need to route shielded 

headset and mic wires out the port side of instrument module through 

a D-sub connector.



Curiosity question, what would happen if the shields were connected 

at the D-sub?


	


    What does the PS installation instructions say about

    shielding? It should describe their recommendations

    for terminating the shields. Do they use the shields

    a part of the signal paths (i.e. grounds) or are they

    simply shields over an array of wires? It makes

    a difference and they should tell you exactly how

    to do it.



    For example, on page 1.10 of



http://www.aeroelectric.com/Catalog/AEC/9009/9009-700L.pdf



   you can see examples of shield-only and shield-plus-signal

   connections for shielded wires.



   Bob . . .

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rparigoris

Joined: 24 Nov 2009
Posts: 791

Posted: Mon Jul 05, 2010 12:16 pm Post subject: Re: Headset and mic shield question

Hi Bob



I have a PS Engineering PMA 4000.

See:

Page #21:

http://www.ps-engineering.com/docs/PMA4000_IM.pdf



Each 2 or 3 conductor cable has the shield connected to a different pin on the 25 pinb P1 Bottom Unit Connector.



If pin 1, 2 , 6 and 7 were to touch each other at my D-sub connector, what trouble (if any) might that cause?



Thx.

Ron Parigoris

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nuckolls.bob(at)aeroelect
Guest

Posted: Sat Jul 10, 2010 5:10 pm Post subject: Headset and mic shield question

At 03:16 PM 7/5/2010, you wrote:

 	  Quote: 	
		  

<rparigor(at)suffolk.lib.ny.us>



Hi Bob



I have a PS Engineering PMA 4000.

See:

Page #21:

http://www.ps-engineering.com/docs/PMA4000_IM.pdf



Each 2 or 3 conductor cable has the shield connected to a different 

pin on the 25 pinb P1 Bottom Unit Connector.



If pin 1, 2 , 6 and 7 were to touch each other at my D-sub 

connector, what trouble (if any) might that cause?


	


   None. All their shields are open at the far end, i.e.

   only shields and not part of the audio path. "audio LO"

   connections in virtually all such systems is a common

   signal ground.



   Bob . . .

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