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Headphone squeal

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jay(at)horriblehyde.com
Guest

Posted: Thu Dec 22, 2011 2:11 am Post subject: Headphone squeal

I’m busy trying to solve a problem of a load squeal in the headphones.  The installation was done by somebody else and I’m picking up the pieces  J

 

The system uses a Flightcom 403 intercom and has pilot, copilot and 2 pax places.  I see that both the headphone and microphone wires are run in the same shielded cable (a 3 core cable).  Whenever you plug a headset into any of the pax places you get an almost immediate squeal in all the ‘phones.  Sometimes it does not start immediately, but as soon as you tap or try to speak into the microphone the squeal starts.  Best practice suggests that the microphone and headphones wire should be separate and shielded so I suspect that this may be where the problem lies.

 

Anybody else had similar problems?

 

Jay

  [quote][b]

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ceengland(at)bellsouth.ne
Guest

Posted: Thu Dec 22, 2011 6:47 am Post subject: Headphone squeal

On 12/22/2011 04:07 AM, Jay Hyde wrote:      	  Quote: 	
		                         <![endif]-->   <![endif]-->                

I’m busy trying to solve a problem of a           load squeal in the headphones.  The installation was done by           somebody else and I’m picking up the pieces  J         

          

The system uses a Flightcom 403 intercom           and has pilot, copilot and 2 pax places.  I see that both the           headphone and microphone wires are run in the same shielded           cable (a 3 core cable).  Whenever you plug a headset into any           of the pax places you get an almost immediate squeal in all           the ‘phones.  Sometimes it does not start immediately, but as           soon as you tap or try to speak into the microphone the squeal           starts.  Best practice suggests that the microphone and           headphones wire should be separate and shielded so I suspect           that this may be where the problem lies.         

          

Anybody else had similar problems?         

          

Jay

                

     	
     To eliminate the easy stuff first:

     

     Are the all headphones on or off the heads of the users? If any     headset is plugged in but *not* properly installed on a head, you     can get a positive-feedback squeal as soon as you excite the system     by speaking into or tapping on a mic.

     

     I wouldn't claim that it's impossible for the wire to cause the     problem, but look at the cable attached to the headphones. 

     

     Charlie

      [quote][b]

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recapen(at)earthlink.net
Guest

Posted: Thu Dec 22, 2011 7:03 am Post subject: Headphone squeal

My copilot station pops and breaks squelch when there isn't a head between the mic and earpieces.  The noise from the vent or heater kicks it off so I unplug the mic jack when I'm flying solo.....



Someone else mentioned something similar to this - so I'm chiming in too.....





--

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berkut13(at)berkut13.com
Guest

Posted: Thu Dec 22, 2011 7:15 am Post subject: Headphone squeal

One 3-conductor shielded cable for both mic and phone?   How are  the grounds (collar) for each plug isolated from each other as well as from  airframe ground?

  

 I think you are barking up the right tree.  If the system is not wired  as the intercom manufacturer suggests, thatâ€™s the first place to start.

  

 -James

  

  

    From: Charlie England (ceengland(at)bellsouth.net) 

 Sent: Thursday, December 22, 2011 8:43 AM

 To: aeroelectric-list(at)matronics.com (aeroelectric-list(at)matronics.com)  

 Subject: Re: Headphone  squeal



  On  12/22/2011 04:07 AM, Jay Hyde wrote:  [quote]             

Iâ€™m busy trying to solve a problem of a load squeal in the    headphones.  The installation was done by somebody else and Iâ€™m picking    up the pieces  J   

    

The system uses a Flightcom 403 intercom and has pilot,    copilot and 2 pax places.  I see that both the headphone and microphone    wires are run in the same shielded cable (a 3 core cable).  Whenever you    plug a headset into any of the pax places you get an almost immediate squeal    in all the â€˜phones.  Sometimes it does not start immediately, but as soon    as you tap or try to speak into the microphone the squeal starts.  Best    practice suggests that the microphone and headphones wire should be separate    and shielded so I suspect that this may be where the problem    lies.   

    

Anybody else had similar problems?   

    

Jay



 [b]

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tim2542(at)sbcglobal.net
Guest

Posted: Thu Dec 22, 2011 7:35 am Post subject: Headphone squeal

On 12/22/2011 2:07 AM, Jay Hyde wrote:      	  Quote: 	
		                         <![endif]-->   <![endif]-->                

I’m busy trying to solve a problem of a           load squeal in the headphones.  The installation was done by           somebody else and I’m picking up the pieces  J         

          

The system uses a Flightcom 403 intercom           and has pilot, copilot and 2 pax places.  I see that both the           headphone and microphone wires are run in the same shielded           cable (a 3 core cable).  Whenever you plug a headset into any           of the pax places you get an almost immediate squeal in all           the ‘phones.  Sometimes it does not start immediately, but as           soon as you tap or try to speak into the microphone the squeal           starts.  Best practice suggests that the microphone and           headphones wire should be separate and shielded so I suspect           that this may be where the problem lies.         

          

Anybody else had similar problems?         

          

Jay       

        	  Quote: 	
		  

	
     	
     

     Jay; from what I have read about this, putting mic & phone audio     inside the same shielded cable will almost guarantee what you are     seeing. If you go to PSE's site,    (      http://www.ps-engineering.com/support.shtml  )

     they have a Power Point file on how to wire an audio panel. Lots of     other tips & tricks on the ppt also.

     Tim 

     [quote]        	  Quote: 	
		  

	
     [b]

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jay(at)horriblehyde.com
Guest

Posted: Thu Dec 22, 2011 8:19 am Post subject: Headphone squeal

I received a response from Flightcom, “If a mono headset is plugged into the intercom or a stereo headset that is set to mono, this will cause the squeal. Or if the wiring is not shielded cable, and the mic and headphone wires are in the same cable”

 

So it seems that I am barking up the right tree (at least in terms of the wires- not sure that I get the mono/ stereo thing, especially since their system is mono…) , which is what I thought; but thanks for the inputs.  I am going to re-wire the system and will give you feedback when done.

 

Jay

From: owner-aeroelectric-list-server(at)matronics.com [mailto:owner-aeroelectric-list-server(at)matronics.com] On Behalf Of Tim Andres

Sent: 22 December 2011 05:33 PM

To: aeroelectric-list(at)matronics.com

Subject: Re: Headphone squeal

 

On 12/22/2011 2:07 AM, Jay Hyde wrote: 

I’m busy trying to solve a problem of a load squeal in the headphones.  The installation was done by somebody else and I’m picking up the pieces  J

 

The system uses a Flightcom 403 intercom and has pilot, copilot and 2 pax places.  I see that both the headphone and microphone wires are run in the same shielded cable (a 3 core cable).  Whenever you plug a headset into any of the pax places you get an almost immediate squeal in all the ‘phones.  Sometimes it does not start immediately, but as soon as you tap or try to speak into the microphone the squeal starts.  Best practice suggests that the microphone and headphones wire should be separate and shielded so I suspect that this may be where the problem lies.

 

Anybody else had similar problems?

 

Jay 	  Quote: 	
		   	




Jay; from what I have read about this, putting mic & phone audio inside the same shielded cable will almost guarantee what you are seeing. If you go to PSE's site,    (  http://www.ps-engineering.com/support.shtml  )

they have a Power Point file on how to wire an audio panel. Lots of other tips & tricks on the ppt also.

Tim 



 	  Quote: 	
		   	


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  [quote][b]

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deej(at)deej.net
Guest

Posted: Thu Dec 22, 2011 9:21 am Post subject: Headphone squeal

On 12/22/2011 11:16 AM, Jay Hyde wrote:

 	  Quote: 	
		   Or if the wiring is not shielded cable, and the mic and

 headphone wires are in the same cable”


	




	I'm a bit confused by this.  Aren't the mic and headphone wires in the

same cable on the headphone itself (ie, the cable that goes between the

headphone and the plugs)?



-Dj

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email(at)jaredyates.com
Guest

Posted: Thu Dec 22, 2011 3:20 pm Post subject: Headphone squeal

I would suggest barking up the mono/stereo tree. I have installed this intercom and I added a stereo/mono switch at each station, per the directions. I can send you a pdf of the install manual if you need it. I can produce a squeal in my system by operating that switch incorrectly. 



On Dec 22, 2011, at 11:16, "Jay Hyde" <jay(at)horriblehyde.com (jay(at)horriblehyde.com)> wrote:



[quote]  <![endif]-->   <![endif]-->

I received a response from Flightcom, â€œIf a mono headset is plugged into the intercom or a stereo headset that is set to mono, this will cause the squeal. Or if the wiring is not shielded cable, and the mic and headphone wires are in the same cableâ€

 

So it seems that I am barking up the right tree (at least in terms of the wires- not sure that I get the mono/ stereo thing, especially since their system is monoâ€¦) , which is what I thought; but thanks for the inputs.  I am going to re-wire the system and will give you feedback when done.

 

Jay

From: owner-aeroelectric-list-server(at)matronics.com (owner-aeroelectric-list-server(at)matronics.com) [mailto:owner-aeroelectric-list-server(at)matronics.com] On Behalf Of Tim Andres

Sent: 22 December 2011 05:33 PM

To: aeroelectric-list(at)matronics.com (aeroelectric-list(at)matronics.com)

Subject: Re: Headphone squeal

 

On 12/22/2011 2:07 AM, Jay Hyde wrote: 

Iâ€™m busy trying to solve a problem of a load squeal in the headphones.  The installation was done by somebody else and Iâ€™m picking up the pieces  J

 

The system uses a Flightcom 403 intercom and has pilot, copilot and 2 pax places.  I see that both the headphone and microphone wires are run in the same shielded cable (a 3 core cable).  Whenever you plug a headset into any of the pax places you get an almost immediate squeal in all the â€˜phones.  Sometimes it does not start immediately, but as soon as you tap or try to speak into the microphone the squeal starts.  Best practice suggests that the microphone and headphones wire should be separate and shielded so I suspect that this may be where the problem lies.

 

Anybody else had similar problems?

 

Jay 	  Quote: 	
		   	




Jay; from what I have read about this, putting mic & phone audio inside the same shielded cable will almost guarantee what you are seeing. If you go to PSE's site,    (  http://www.ps-engineering.com/support.shtml  )

they have a Power Point file on how to wire an audio panel. Lots of other tips & tricks on the ppt also.

Tim 



 	  Quote: 	
		   	


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" face="courier new,courier">www.aeroelectric.com

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uilthelp.com
	


matronics.com/contribution

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st">http://www.matronics.com/Navigator?AeroElectric-List

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cs.com

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matronics.com/contribution

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[b]

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michael.phil(at)ca.rr.com
Guest

Posted: Fri Dec 23, 2011 12:11 am Post subject: Headphone squeal

Check for insulation washer on mic jack



Sent from my iPad



On Dec 22, 2011, at 2:07 AM, "Jay Hyde" <jay(at)horriblehyde.com (jay(at)horriblehyde.com)> wrote:



[quote]  <![endif]-->   <![endif]-->

Iâ€™m busy trying to solve a problem of a load squeal in the headphones.  The installation was done by somebody else and Iâ€™m picking up the pieces  J

 

The system uses a Flightcom 403 intercom and has pilot, copilot and 2 pax places.  I see that both the headphone and microphone wires are run in the same shielded cable (a 3 core cable).  Whenever you plug a headset into any of the pax places you get an almost immediate squeal in all the â€˜phones.  Sometimes it does not start immediately, but as soon as you tap or try to speak into the microphone the squeal starts.  Best practice suggests that the microphone and headphones wire should be separate and shielded so I suspect that this may be where the problem lies.

 

Anybody else had similar problems?

 

Jay

   	  Quote: 	
		  



===================================

ctric.com

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		  www.buildersbooks.com

uilthelp.com
	


matronics.com/contribution

===================================

st">http://www.matronics.com/Navigator?AeroElectric-List

===================================

cs.com

===================================

matronics.com/contribution

===================================



	


[b]

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