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Date: Tue, 27 May 2014 15:31:36 -0400
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From: "Shane" <f4u5n@shaw.ca>
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Subject: Re: [LML] Audio squeal
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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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