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nfrance(at)avnet.co.uk
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 Posted: Mon Apr 06, 2009 1:56 pm Post subject: Noise in headset when pressing to talk |
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Hello listers, I hope you can help me figure out a small problem I have please.
I have a mk IV Kitfox fitted with a Bendix King KY97A radio coupled to a Flightcom 403mc intercom, which has been in service without trouble for a number of years.
The aircraft has not flown for around seven months, and I am putting it back into service.
When the pilots side ptt is pressed, there is a loud constant noise through both headsets, when the copilots ptt is pressed, there is no noise.
I replaced the wiring and earths to the pilots stick, but it made no difference
I then removed the wire from pin no. 7( pilots ptt switch), on the rear of the unit to eliminate the ptt switch and wiring, and substituted a long length of wire which I touched directly to the battery negative, and the noise was still there.
I checked the pins and sockets which all look in perfect condition, but cleaned them anyway.
If I use the long length of wire from the battery to pin no. 6 (copilot ptt switch ) it works perfectly with no noise.
The noise I hear in my headset, is not transmitted , I have checked the radio reception from a hand held radio using different headsets plugged into the pilot and copilot sockets, and reception is perfect with no background noise.
Has anyone any ideas what it could be please?
Any help would be greatly appreciated, thanks in advance,
Neil.
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aaaron(at)tvp.com.au
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| Posted: Mon Apr 06, 2009 2:58 pm Post subject: Noise in headset when pressing to talk |
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I had a similar problem and it turned out to be a problem with my lightspeed headset. I send them back to lightspeed and they fixed them at no charge.
Allan
From: owner-aeroelectric-list-server(at)matronics.com [mailto:owner-aeroelectric-list-server(at)matronics.com] On Behalf Of Neil France
Sent: Tuesday, 7 April 2009 7:55 AM
To: aeroelectric-list(at)matronics.com
Subject: Noise in headset when pressing to talk
Hello listers, I hope you can help me figure out a small problem I have please.
I have a mk IV Kitfox fitted with a Bendix King KY97A radio coupled to a Flightcom 403mc intercom, which has been in service without trouble for a number of years.
The aircraft has not flown for around seven months, and I am putting it back into service.
When the pilots side ptt is pressed, there is a loud constant noise through both headsets, when the copilots ptt is pressed, there is no noise.
I replaced the wiring and earths to the pilots stick, but it made no difference
I then removed the wire from pin no. 7( pilots ptt switch), on the rear of the unit to eliminate the ptt switch and wiring, and substituted a long length of wire which I touched directly to the battery negative, and the noise was still there.
I checked the pins and sockets which all look in perfect condition, but cleaned them anyway.
If I use the long length of wire from the battery to pin no. 6 (copilot ptt switch ) it works perfectly with no noise.
The noise I hear in my headset, is not transmitted , I have checked the radio reception from a hand held radio using different headsets plugged into the pilot and copilot sockets, and reception is perfect with no background noise.
Has anyone any ideas what it could be please?
Any help would be greatly appreciated, thanks in advance,
Neil.
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