Return-Path: Received: from relay02.roc.ny.frontiernet.net ([66.133.131.35] verified) by logan.com (CommuniGate Pro SMTP 4.2b3) with ESMTP id 3230029 for flyrotary@lancaironline.net; Thu, 13 May 2004 03:10:21 -0400 Received: (qmail 11292 invoked from network); 13 May 2004 07:10:21 -0000 Received: from 170-215-102-5.bras01.cok.tn.frontiernet.net (HELO frontiernet.net) ([170.215.102.5]) (envelope-sender ) by relay02.roc.ny.frontiernet.net (FrontierMTA 2.3.18) with SMTP for ; 13 May 2004 07:10:21 -0000 Message-ID: <40A32014.91E98820@frontiernet.net> Date: Thu, 13 May 2004 02:13:24 -0500 From: Jim Sower X-Mailer: Mozilla 4.77 [en] (Win98; U) X-Accept-Language: en MIME-Version: 1.0 To: Rotary motors in aircraft Subject: Re: [FlyRotary] Alternator noise References: Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit How old is the alternator? New ones tend to have more brush noise than older ones. Is all the intercom wiring shielded (and shields properly grounded)? I would check intercom wire shielding and then put the biggest capacitor I can find on the alternator output. My experience .... Jim S. DaveLeonard wrote: > Now that the engine is running well, I have a new problem. Alternator > noise. The intercom is the main problem (victim). When the intercom the > alternator noise is quite noticeable, even annoying. The noise goes away > altogether when the intercom is off (i.e., when using the radio without the > intercom/audio panel). If I turn off the alternator the noise mostly goes > away, (I think the coils make a faint noise - but it is not significant.) > > The intercom/audio panel is the kit from RST. > > I was going to try an automotive filter on the power to the intercom. Any > other thoughts/suggestions? > > Thanks, > Dave Leonard > > >> Homepage: http://www.flyrotary.com/ > >> Archive: http://lancaironline.net/lists/flyrotary/List.html -- Jim Sower ... Destiny's Plaything Crossville, TN; Chapter 5 Long-EZ N83RT, Velocity N4095T