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gyoung
Joined: 09 Jan 2006
Posts: 211
Location: Republic of Texas
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 Posted: Tue Apr 21, 2009 7:18 am Post subject: 757 mic bias voltage |
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I've got a friend that flys 757's using a Bose headset and has the mic get hot (warm) during the course of a flight, not burn-your-lips-hot, but too hot. Talked to the Bose service mgr here at Sun n Fun and he wants to know what the mic bias voltage is since a replacement mic didn't fix it. FWIW, the mic is live continuously because of the CVR. I thought there might be someone in the brain trust here that might know the answer or have any other ideas. It's not a problem in GA aircraft - he flew with me to SnF in my Navion for 5 hrs and had no problem. Likewise none in his GA airplanes.
Regards,
Greg Young
[quote][b]
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nuckolls.bob(at)aeroelect
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| Posted: Tue Apr 21, 2009 9:11 am Post subject: 757 mic bias voltage |
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At 10:13 AM 4/21/2009, you wrote:
| Quote: | | I've got a friend that flys 757's using a Bose headset and has the mic get hot (warm) during the course of a flight, not burn-your-lips-hot, but too hot. Talked to the Bose service mgr here at Sun n Fun and he wants to know what the mic bias voltage is since a replacement mic didn't fix it. FWIW, the mic is live continuously because of the CVR. I thought there might be someone in the brain trust here that might know the answer or have any other ideas. It's not a problem in GA aircraft - he flew with me to SnF in my Navion for 5 hrs and had no problem. Likewise none in his GA airplanes. |
Don't know what the Bose "ratings" are but in
situations where I've had occasion to put a voltmeter
across an active mic in a TC aircraft, measurement
were always in the 3-5 volt range.
A simple check of his mic while plugged into the
ship's audio system may show a lot more.
Bob . . .
----------------------------------------)
( . . . a long habit of not thinking )
( a thing wrong, gives it a superficial )
( appearance of being right . . . )
( )
( -Thomas Paine 1776- )
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[quote][b]
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