Audio squeal

Submitted by Anonymous on

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From: Danny <danny [at] n107sd.com>
Sender: <marv [at] lancaironline.net>
Subject: Audio squeal
Date: Tue, 27 May 2014 07:51:55 -0400
To: <lml [at] lancaironline.net>

This is for all you avionics buffs.  I was headed out for an instrument proficiency check last Saturday.  As we were taxiing out I noticed what sounded like a slight echo in my headset.  My CFII heard it too.  It was the kind of thing one hears from a feedback loop on public address microphone.  We didn’t give it much thought at first but as we continued talking it got progressively worse until finally it became a squeal whenever we spoke, again, just like a PA system microphone.  We played with the squelch, volume, and different headsets, all to no avail.  I later found that it isn’t there with only the pilot headset plugged in.  It also disappears when I bypass the audio panel.  This happened once before several months ago.  I had it look at by a reputable avionics shop but they were unable to replicate it and could find nothing wrong with neither my radios nor my audio panel.  I plan to have them take another look as soon as they can schedule me in but thought I’d query the list in the event anybody here has any experience in this area.  Your comments, thoughts, and consideration are appreciated.



Danny

LNC2-360 Mk-II

AOPA 04856278

EAA 647062

NRA 156453324

Nothing is foolproof to the sufficiently talented fool.

Audio squeal

Submitted by Anonymous on

From: Shane <f4u5n [at] shaw.ca>
Sender: <marv [at] lancaironline.net>
Subject: Re: [LML] Audio squeal
Date: Tue, 27 May 2014 15:31:36 -0400
To: <lml [at] lancaironline.net>
Message Header


Undecoded Message

Danny,



I had this happen on one of my aircraft about a year ago. I have a number of different headsets and every so often I would be taking someone for a flight and we would end up with the squeal just as you described. I also had an avionics shop check out the equipment, but they were unable to find anything wrong. After dealing with this a few times I discovered that it was the mic gain on one of the headsets that was causing the problem. I adjusted the gain down on all on all of my headsets and have not had a problem since.



Hope this helps,



Shane Daly



-----Original Message----- From: Danny

Sent: Tuesday, May 27, 2014 5:51 AM

To: Lancair Mailing List

Subject: [LML] Audio squeal



This is for all you avionics buffs.  I was headed out for an instrument

proficiency check last Saturday.  As we were taxiing out I noticed what

sounded like a slight echo in my headset.  My CFII heard it too.  It was

the kind of thing one hears from a feedback loop on public address

microphone.  We didn’t give it much thought at first but as we continued

talking it got progressively worse until finally it became a squeal

whenever we spoke, again, just like a PA system microphone.  We played

with the squelch, volume, and different headsets, all to no avail.  I

later found that it isn’t there with only the pilot headset plugged in.

It also disappears when I bypass the audio panel.  This happened once

before several months ago.  I had it look at by a reputable avionics

shop but they were unable to replicate it and could find nothing wrong

with neither my radios nor my audio panel.  I plan to have them take

another look as soon as they can schedule me in but thought I’d query

the list in the event anybody here has any experience in this area.

Your comments, thoughts, and consideration are appreciated.



Danny

LNC2-360 Mk-II

AOPA 04856278

EAA 647062

NRA 156453324

Nothing is foolproof to the sufficiently talented fool.





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Audio squeal

Submitted by Anonymous on

From: Danny <danny [at] n107sd.com>
Sender: <marv [at] lancaironline.net>
Subject: RE: [LML] Re: Audio squeal
Date: Wed, 28 May 2014 07:37:40 -0400
To: <lml [at] lancaironline.net>
Message Header


Undecoded Message

Thanks Shane.  I'll have to look up how to do that on my David Clark sets.



Danny

LNC2-360 Mk-II

AOPA 04856278

EAA 647062

NRA 156453324

Nothing is foolproof to the sufficiently talented fool.



-----Original Message-----

From: Shane [f4u5n [at] shaw.ca (mailto:)

]

Sent: Tuesday, May 27, 2014 3:32 PM

To: Lancair Mailing List

Subject: [LML] Re: Audio squeal



Danny,



I had this happen on one of my aircraft about a year ago. I have a number of different headsets and every so often I would be taking someone for a flight and we would end up with the squeal just as you described. I also had an avionics shop check out the equipment, but they were unable to find anything wrong. After dealing with this a few times I discovered that it was the mic gain on one of the headsets that was causing the problem. I adjusted the gain down on all on all of my headsets and have not had a problem since.



Hope this helps,



Shane Daly



-----Original Message-----

From: Danny

Sent: Tuesday, May 27, 2014 5:51 AM

To: Lancair Mailing List

Subject: [LML] Audio squeal



This is for all you avionics buffs.  I was headed out for an instrument proficiency check last Saturday.  As we were taxiing out I noticed what sounded like a slight echo in my headset.  My CFII heard it too.  It was the kind of thing one hears from a feedback loop on public address microphone.  We didn’t give it much thought at first but as we continued talking it got progressively worse until finally it became a squeal whenever we spoke, again, just like a PA system microphone.  We played with the squelch, volume, and different headsets, all to no avail.  I later found that it isn’t there with only the pilot headset plugged in.

It also disappears when I bypass the audio panel.  This happened once before several months ago.  I had it look at by a reputable avionics shop but they were unable to replicate it and could find nothing wrong with neither my radios nor my audio panel.  I plan to have them take another look as soon as they can schedule me in but thought I’d query the list in the event anybody here has any experience in this area.

Your comments, thoughts, and consideration are appreciated.



Danny

LNC2-360 Mk-II

AOPA 04856278

EAA 647062

NRA 156453324

Nothing is foolproof to the sufficiently talented fool.





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