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At 06:14 PM 2/4/02 -0800, [EMAIL PROTECTED] wrote: >----[Please read http://ercoupers.com/disclaimer.htm before following >any >advice in this forum.]---- > >Just read the article. It speaks of ALTERNATOR noise, not generator. >Maybe a generator can't produce this kind of disturbance. Both alternators and generators can make nasty noise. As can the ignition circuit. To confirm which it is, go flying. Turn on the radio. Hear the noise. Turn off the generator switch. Is the noise gone? If not, then kill the mags, one at a time. Does the noise change? If you're brave, and high enough, kill both mags. Does the noise (no not the engine noise) change? Now you've isolated the noise to either ignition or charging system. As someone suggested, grounding is critical for noise suppression on charging systems. Bad generator brushes can also be noisier than they should be. Grounding is also critical for ignition system shielding. A shield doesn't work unless it's grounded, and at magneto voltages this means a GOOD ground, not a half-assed 30-year old semiconducting grease-covered piece of braid. You also have to verify the ground on the antenna side of the radio. As well as the antenna connection. As well as the quality of the coax going to the antenna. Leakage anywhere here, or a crappy job of putting on the connectors, or corrosion where the antenna ground contacts the airplane at the antenna end can all lead to more receiver noise than is warranted. Your proposed fix was to put an alternator in. Very likely that would just change the noise not at all or change it from generator buzz to alternator whine. That would be quite a $1000.00 experiment. Shoot the bug. Find the offending system or systems, and check their grounding and shielding. Greg ==^================================================================ This email was sent to: [EMAIL PROTECTED] EASY UNSUBSCRIBE click here: http://topica.com/u/?bz8Sid.bAhN69 Or send an email to: [EMAIL PROTECTED] T O P I C A -- Register now to manage your mail! http://www.topica.com/partner/tag02/register ==^================================================================
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