carlosh(at)sec-engr.com
Guest
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 Posted: Thu Nov 02, 2006 2:22 pm Post subject: HEADset woes |
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FLYaDIVE(at)aol.com wrote:
| Quote: | In a message dated 10/6/2006 10:33:59 AM Eastern Standard Time,
rv8striker(at)hotmail.com writes:
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
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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"*
*
*
------------------------------------------------------------------------
I have had a similar problem with my plane. We have the Icom IC-A200 and
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Sigtonics Sport 200 intercom and have had communication problems for
sometime. We went through everything. Changed the gain setings in our
headsets, redid all ground connections in the plane and even sent the
radio back for testing.
Just this morning I had another avionics guy look over our install. He
swapped intercoms and the problem was still there. A few minutes later
he removed the radio and found that on the radio itself has a mic
setting. It was set wide open (or closed?) so intercom between us sucked
and when we hit the PTT all TX went to hell! SQUUUEEEAAAAAAAAALLLLLLL!!!
Feedback. After he reset the mic setting everything is working properly
for all headsets. I have both mono & stereo.
So this may or may not be your exact solution but it's another avenue to
look into.
Carlos in Arizona
PL-1 - N2029 flying
RV7A - N174PP reserved
--
Carlos Hernandez <carlosh(at)sec-engr.com>
Structural Engineers, LLC
2111 E. Broadway Rd. - Suite 3
Tempe, AZ 85282
Phone: 480.968.8600
Fax: 480.968.8608
www.sec-engr.com
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