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Feedback while transmitting

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mhilderbrand

Joined: 28 Sep 2006
Posts: 36

Posted: Wed Dec 16, 2009 3:13 pm Post subject: Feedback while transmitting

I am getting a loud feedback noise in my headset when I press the PTT.  It only seems to happen 70% of the time - having the engine running, or not, is of no difference.  Today in the hangar I pressed the PTT and could hear the feedback coming out of the speakers of my jam-box radio several feet away! The radio on the jam-box was on but the volume turned all the way down. When I unplugged it I could no longer hear the noise in the jam-box, but it was VERY present in my headphones. Of course, this in a new installation in my airplane - flown the plane 2 times now.  Not being able to her yourself talk is frustrating! Oh.. yeah, the receiving end ALWAYS hears me "loud & clear."  

  

 Anyone have a good FIRST place to start looking to fix this problem. It seems  like it might be a simple fix.... a ground maybe? Inadequate antenna?   

  

 Thanks! 

 

Michael Hilderbrand

Derby, Kansas

Http://www.kansasflying.com  



 [quote][b]

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mhilderbrand

Joined: 28 Sep 2006
Posts: 36

Posted: Wed Dec 16, 2009 6:07 pm Post subject: Feedback while transmitting

did not seem to post the first time... please scroll down.

 

Michael Hilderbrand

Derby, Kansas

Http://www.kansasflying.com 



 

 ----- Forwarded Message ----

From: Michael Hilderbrand <m_hilderbrand(at)sbcglobal.net>

To: Aeroelectric-list(at)matronics.com

Sent: Wed, December 16, 2009 5:06:37 PM

Subject: Feedback while transmitting



  

 I am getting a loud feedback noise in my headset when I press the PTT.  It only seems to happen 70% of the time - having the engine running, or not, is of no difference.  Today in the hangar I pressed the PTT and could hear the feedback coming out of the speakers of my jam-box radio several feet away! The radio on the jam-box was on but the volume turned all the way down. When I unplugged it I could no longer hear the noise in the jam-box, but it was VERY present in my headphones. Of course, this in a new installation in my airplane - flown the plane 2 times now.  Not being able to her yourself talk is frustrating! Oh.. yeah, the receiving end ALWAYS hears me "loud & clear."  

  

 Anyone have a good FIRST place to start looking to fix this problem. It seems  like it might be a simple fix.... a ground maybe? Inadequate antenna?   

  

 Thanks! 

 

Michael Hilderbrand

Derby, Kansas

Http://www.kansasflying.com  





 [quote][b]

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airgus(at)kc.rr.com
Guest

Posted: Wed Dec 16, 2009 6:22 pm Post subject: Feedback while transmitting

Michael Hilderbrand wrote:

 	  Quote: 	
		   I am getting a loud feedback noise in my headset when I press the 

 PTT.  It only seems to happen 70% of the time - having the 

 engine running, or not, is of no difference.  Today in the hangar I 

 pressed the PTT and could hear the feedback coming out of the 

 speakers of my jam-box radio several feet away! The radio on the 

 jam-box was on but the volume turned all the way down. When I 

 unplugged it I could no longer hear the noise in the jam-box, but it 

 was VERY present in my headphones. Of course, this in a new 

 installation in my airplane - flown the plane 2 times now.  Not being 

 able to her yourself talk is frustrating! Oh.. yeah, the receiving 

 end ALWAYS hears me "loud & clear." 

  

 Anyone have a good FIRST place to start looking to fix this problem. 

 It seems  like it might be a simple fix.... a ground maybe? Inadequate 

 antenna?  

  

 Thanks!

  

 Michael Hilderbrand

 Derby, Kansas

 Http://www.kansasflying.com

 *

 *

I had the same problem, intermittent feedback - until I started moving 
	


my headset cables around and voila! At a certain position in relation to 

the antenna cable it started squealing. I rerouted my antenna cable and 

the problem went away.

Gus Sonex N7770R

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mhilderbrand

Joined: 28 Sep 2006
Posts: 36

Posted: Thu Dec 17, 2009 8:14 am Post subject: Feedback while transmitting

Thanks Gus, 

  

 My headphone jacks (and headsets) are in close proximity of the antenna.  The jacks are located on the first former behind the seat and the antenna is just above all that on top of the turtle deck. 

  

 I will move things around and see what happens.  

 

Michael Hilderbrand

Derby, Kansas

Http://www.kansasflying.com  



 

   From: Gus Schlegel <airgus(at)kc.rr.com>

To: aeroelectric-list(at)matronics.com

Sent: Wed, December 16, 2009 8:07:39 PM

Subject: Re: Feedback while transmitting



--> AeroElectric-List message posted by: Gus Schlegel <airgus(at)kc.rr.com (airgus(at)kc.rr.com)>



Michael Hilderbrand wrote:

 	  Quote: 	
		   I am getting a loud feedback noise in my headset when I press the PTT.  It only seems to happen 70% of the time - having the engine running, or not, is of no difference.  Today in the hangar I pressed the PTT and could hear the feedback coming out of the speakers of my jam-box radio several feet away! The radio on the jam-box was on but the volume turned all the way down.  When I unplugged it I could no longer hear the noise in the jam-box, but it was VERY present in my headphones. Of course, this in a new installation in my airplane - flown the plane 2 times now.  Not being able to her yourself talk is frustrating! Oh.. yeah, the receiving end ALWAYS hears me "loud & clear."  Anyone have a good FIRST place to start looking to fix this problem. It seems  like it might be a simple fix.... a ground maybe? Inadequate antenna?  Thanks!

  Michael Hilderbrand

 Derby, Kansas

 Http://www.kansasflying.com

 *

 *

I had the same problem, intermittent feedback - until I started moving my headset cables around and voila! At a certain position in relation to the antenna cable it started squealing. I rerouted my antenna cable and the problem went away.
	


Gus Sonex sp;   * AeroElectric www.buildur generous                  -Matt Dralle, List

 [quote][b]

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nuckolls.bob(at)aeroelect
Guest

Posted: Thu Dec 17, 2009 10:42 am Post subject: Feedback while transmitting

At 10:09 AM 12/17/2009, you wrote:

 	  Quote: 	
		  Thanks Gus,



My headphone jacks (and headsets) are in close proximity of the 

antenna.  The jacks are located on the first former behind the seat 

and the antenna is just above all that on top of the turtle deck.



I will move things around and see what happens.


	




   Just a reminder to the List about risks for

   the proximity of certain things . . .



   The Comm transmit antenna is the STRONGEST

   potential antagonist for deleterious effects

   of EMC in the airplane. Microphone wiring

   (indeed all audio wiring) is a close second

   place to thermocouple wiring for most likely

   victims to RF interference.



   The mic and thermocouple wires are generally

   limited as to routing and connections. The

   antenna is by far the easiest thing to get

   as far as practical from the firewall and

   cockpit.



        Bob . . .

                    ////

                   (o o)

    ===========o00o=(_)=o00o=========

    < Go ahead, make my day . . .   >

    < show me where I'm wrong.      >

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

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mrspudandcompany(at)veriz
Guest

Posted: Thu Dec 17, 2009 11:44 am Post subject: Feedback while transmitting

Just a reminder to the List about risks for

   the proximity of certain things . . .



   The Comm transmit antenna is the STRONGEST

   potential antagonist for deleterious effects

   of EMC in the airplane. Microphone wiring

   (indeed all audio wiring) is a close second

   place to thermocouple wiring for most likely

   victims to RF interference.



   The mic and thermocouple wires are generally

   limited as to routing and connections. The

   antenna is by far the easiest thing to get

   as far as practical from the firewall and

   cockpit.



        Bob 



Would I be correct in assuming that there should be very little interference

picked up in the mic and thermocouple wires if they are run next to the com

coax, as long as they are not near the antenna, i.e. bundled together behind

the instrument panel?



Roger

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