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#19
April 15th 06, 04:10 AM
posted to rec.aviation.owning
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Headset Noise
In all the years of chasing alternator whine in aircraft audio systems,
it sounded to me that it is at a couple of Khz. Jon, If the engine is turning 2600 RPM, that is 43 revs per sec. The pulleys on the alternator have a ratio of about 4:1, so that would make the alternator spin at about 173 revs per sec, or 173Hz. That would make the alternator whine (assuming no bad diodes) of 1038Hz. I should alter the sinsoidal current sources to have a freq of 173Hz, instead of the 500Hz I used. btw- for the electrical geeks out there, you are familiar with LTSpice, arent you? If not, go look at www.linear.com and get a download. Best Spice implemenation out there, and it is FREE! 
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