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#1
June 29th 08, 04:57 PM
posted to rec.aviation.soaring
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Transmission feedback on C206 Towplane
Got a Cessna 206 that emits a steady tone during transmission only.
The pitch increases with rpm to a point where ATC refuses service. No tone is emitted on battery power only (Alt. off). No problem yesterday, problem today. Noise remains with audio panel on/off, using L/R trans switch, speaker on/off, swapping headsets(Bose). Aircraft has 95 amp alt. (belt drive), noise filter. Please email me if more infor. is needed. Thanks R 
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#2
June 29th 08, 10:01 PM
posted to rec.aviation.soaring
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Transmission feedback on C206 Towplane
On Sun, 29 Jun 2008 08:57:09 -0700 (PDT), "
wrote: Got a Cessna 206 that emits a steady tone during transmission only. The pitch increases with rpm to a point where ATC refuses service. No tone is emitted on battery power only (Alt. off). No problem yesterday, problem today. Noise remains with audio panel on/off, using L/R trans switch, speaker on/off, swapping headsets(Bose). Aircraft has 95 amp alt. (belt drive), noise filter. Please email me if more infor. is needed. Thanks R Sounds like a bad noise filter on the alternator. rj
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#3
June 29th 08, 10:34 PM
posted to rec.aviation.soaring
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Transmission feedback on C206 Towplane
Take the alternator off and have your local alternator shop check the
"diodes" in it. They are not certified to repair it but they can sure check it out for you. Bad diodes will cause a hum that changes in pitch with rpm. They can also cause the alternator output to be unstable as seen in a quivering amp meter.
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#4
June 30th 08, 03:30 PM
posted to rec.aviation.soaring
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Transmission feedback on C206 Towplane
I had a problem like this and it turned out to be a bad ground on the
ptt. On Jun 29, 2:34*pm, wrote: Take the alternator off and have your local alternator shop check the "diodes" in it. *They are not certified to repair it but they can sure check it out for you. *Bad diodes will cause a hum that changes in pitch with rpm. *They can also cause the alternator output to be unstable as seen in a quivering amp meter.
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