X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from smtp.knology.net ([24.214.63.101] verified) by logan.com (CommuniGate Pro SMTP 5.0.8) with SMTP id 984031 for flyrotary@lancaironline.net; Mon, 13 Feb 2006 22:56:10 -0500 Received-SPF: pass receiver=logan.com; client-ip=24.214.63.101; envelope-from=rv7rotary@knology.net Received: (qmail 22452 invoked by uid 0); 14 Feb 2006 03:55:27 -0000 Received: from unknown (HELO Silver) (24.96.145.214) by smtp2.knology.net with SMTP; 14 Feb 2006 03:55:27 -0000 From: "Chris Sargent" To: "Rotary motors in aircraft" Subject: RE: [FlyRotary] Radio noise Date: Mon, 13 Feb 2006 21:55:25 -0600 Message-ID: MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit X-Priority: 3 (Normal) X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook IMO, Build 9.0.6604 (9.0.2911.0) Importance: Normal In-Reply-To: X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.2180 Buly, You mentioned picking up noise from many sources. Bob Nuckolls provides several hundred pages of advice on this site: http://www.aeroelectric.com/FAQ/AeroElectric-List/AeroElectric-List_FAQ.pdf Type "noise" in the Acrobat 'Find' feature (binocular icon). Quite a few sources of noise, including motors. Regards, Chris Sargent Here is a problem for you large brained engineers: My radio is picking up noise from all the electrical motors including the alternator. I took the alternator to the shop and checked "as new". When I disconnect the coax from the radio, the noises stop, which leads me to believe the antenna coax is picking up the interference somehow. Guy at the airport suggested a clamp-on ferrite filter on the coax. I bought one tonight, but did not have time to test it. The offenders are: fuel pumps, nose gear motor and alternator. Any Ideas? Buly