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Still "fighting" with Audio Ground

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trigo(at)mail.telepac.pt
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Posted: Sun Nov 09, 2008 9:28 am Post subject: Still "fighting" with Audio Ground

One has to be very careful with Audio grounds, to avoid unwanted “noise”, and I’m still “fighting” with this.  

I am finishing my Intercom wiring and I have what I think to be my last question about this subject:  

   

I have to connect 3 shielded wires (Radio Receive Audio, Radio Transmit Audio and Nav Audio) from the SL-30 Comm/Nav Radio to the Intercom, and I wonder if I should connect the shields to audio ground on both ends (Radio and Intercom) or only one side (which one?)?  

   

Carlos  

   

       [quote][b]

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nuckolls.bob(at)cox.net
Guest

Posted: Sun Nov 09, 2008 10:10 am Post subject: Still "fighting" with Audio Ground

At 05:26 PM 11/9/2008 +0000, you wrote:



 	  Quote: 	
		  One has to be very careful with Audio grounds, to avoid unwanted noise , 

and I m still fighting with this.



I am finishing my Intercom wiring and I have what I think to be my last 

question about this subject:



I have to connect 3 shielded wires (Radio Receive Audio, Radio Transmit 

Audio and Nav Audio) from the SL-30 Comm/Nav Radio to the Intercom, and I 

wonder if I should connect the shields to audio ground on both ends (Radio 

and Intercom) or only one side (which one?)?


	


   What do the installation instructions show?



   See page 13 of . . .



http://www.aeroelectric.com/DIY/Audio_Isolation_Amplifier.pdf

   Here I show a combination of shielded wires where

   some instances use the shield for both noise

   mitigation -AND- part of a signal pathway . . .

   i.e. shields connected at both ends. In others

   the are not used to serve any purpose other than

   noise mitigation.



   Make sure that your installation instructions

   do not show specific connections to both ends.

   If not, ground once to either end. It doesn't

   matter which on a small installation like the

   panel of an S.E. aircraft.



   Bob . . .

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