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HEADset woes

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rv8striker(at)hotmail.com
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Posted: Fri Oct 06, 2006 6:31 am Post subject: HEADset woes

List,

  

 I finally took the plunge and bought the Thirty 3G  Lightspeeds. The day after they arrived I used them in the corporate jet that I  fly. They worked beautifully and because the jet has Bose headsets, I was able  to do a back to back comparison, which BTW, seemed to be about even on all  points. Anyway, here's the problem. When I use the Lightspeeds in my  RV-8, I get a squeal in the interphone when the volume is turned up past a point  where I can hear the back seater. If the volume is low enough, it goes away but  so does my ability to hear my passenger. I don't think it's feedback. It sounds  more like it's related to the VOX threshold. Once the threshold is crossed and  the volume is too high, it squeals. Turn the volume down, the VOX clips off and  the squeal stops. If I put the LS's in the rear and my "cheapos" in the front,  the LS's work fine. I tried the Bose in the RV and they work beautifully in the  front or rear. Until now (60 hours) my two cheepos have worked  fine.

  

 I've talked to the techs a LS and they have no  idea. They seem to think it's my airplane...but why does brand "B" (and my  cheepos) work in my plane and theirs does not?

  

 I also talked to the guys in the avionics shop at  work. They think it could be a mismatch between the LS's (stereo) and my  cheepos. (mono)

  

 My next step is to try two stereo sets and see if  that's the problem but in the meantime any ideas  from you guys would be appreciated.

  

 Steve Struyk

 St. Charles  MO



   [quote][b]

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FLYaDIVE(at)aol.com
Guest

Posted: Fri Oct 06, 2006 8:37 am Post subject: HEADset woes

In a message dated 10/6/2006 10:33:59 AM Eastern Standard Time, rv8striker(at)hotmail.com writes:

  	  Quote: 	
		   I've talked to the techs a LS and they have no idea. They seem to think it's my airplane...but why does brand "B" (and my cheepos) work in my plane and theirs does not?

  

 I also talked to the guys in the avionics shop at work. They think it could be a mismatch between the LS's (stereo) and my cheepos. (mono)

  

 My next step is to try two stereo sets and see if that's the problem but in the meantime any ideas from you guys would be appreciated.

  

 Steve Struyk

 St. Charles MO

	


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

 Hi Steve:

  

 I think the avionics shop is on the right track but needs to refine their thought process just a bit.

  

 It is NOT the stereo, it is the MIC. The Mic is not stereo (not that it needs to be) and it could very well be the MIC impedance between the two different headsets that is causing the problem.

 Now to confuse you a bit further ... It is not the headsets, it is the intercom.  Yes, there probably is a difference between the headsets impedance but it is the intercom, that is not being able to handle the difference that is causing the problem.

 The way to check this out is to use the same type of headset in BOTH the front and read seats at the same time; both Bose's and then both LS.

 ALSO ... It is important to check the following:

 1 - Battery condition in ALL headsets.

 2 - Position of the headset on the head ... Nice and secure, no air/sound leaks around the ear pieces.

 3 - MIC position ... Close to the mouth, just above the upper lip ... So when opening the mouth in Awe (as you roll the plane) there is no rushing sound.

 4 - Mic Muff - Make sure ALL mic's are muffed with that foam thing.

 5 - NEVER leave a headset plugged in when it is not being used during flight.  This is especially true of Noise Canceling headsets.  Doing so will cause all sorts of noise problems.

  

 But, I'd bet it is the intercom with one of these problems:

 1 - Impedance mismatch.  

 2 - Intercom has only ONE Squelch control; better to have a squelch and volume control for pilot & copilot.  Note: 4 seat intercoms do not have a squelch for the passengers.

  

 Hope this helps.

  

  

 Barry

"Chop'd Liver"

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rv8a2001(at)yahoo.com
Guest

Posted: Fri Oct 06, 2006 10:00 am Post subject: HEADset woes

Try to duplicate the problem on the ground with out the engine running..........I am not sure what exactly this will indicate, but somebody here with more knowelegeable than me might be able to make a connection to the problem. I would think if the issue is not duplicated, there might be a mic problem as others mentioned.

  

  

  

Scott Bilinski

RV-8a



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charlieray(at)optonline.n
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Posted: Fri Oct 06, 2006 2:45 pm Post subject: HEADset woes

What kind of Intercom?

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rv8striker(at)hotmail.com
Guest

Posted: Fri Oct 06, 2006 3:06 pm Post subject: HEADset woes

I've had several people ask about my intercom. It's  a Garmin 340 audio panel.

  

 Steve

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brucebell74(at)sbcglobal.
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Posted: Fri Oct 06, 2006 3:37 pm Post subject: HEADset woes

I have found in my RV-4 if the ear pieces are not  seated or tight to the ear I can get some weird nose. My sun glasses can cause a  leak.

 Bruce Bell

 Lubbock, Texas

 RV-4 N23BB

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