X-Virus-Scanned: clean according to Sophos on Logan.com X-SpamCatcher-Score: 32 [X] Return-Path: Sender: To: lml Date: Mon, 11 Dec 2006 16:01:57 -0500 Message-ID: X-Original-Return-Path: Received: from ms-smtp-04.texas.rr.com ([24.93.47.43] verified) by logan.com (CommuniGate Pro SMTP 5.1.3) with ESMTP id 1663311 for lml@lancaironline.net; Mon, 11 Dec 2006 09:38:46 -0500 Received-SPF: pass receiver=logan.com; client-ip=24.93.47.43; envelope-from=toucan@Satx.rr.com Received: from VAIO (cpe-24-243-1-103.satx.res.rr.com [24.243.1.103]) by ms-smtp-04.texas.rr.com (8.13.6/8.13.6) with SMTP id kBBEblc5021435 for ; Mon, 11 Dec 2006 08:37:48 -0600 (CST) X-Original-Message-ID: <009d01c71d31$e8c0c920$6701f318@VAIO> From: "James Cameron" X-Original-To: "Lancair Mailing List" Subject: Electrical bugs X-Original-Date: Mon, 11 Dec 2006 08:37:39 -0600 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_009A_01C71CFF.9DAA7260" X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2900.2869 X-MIMEOLE: Produced By Microsoft MimeOLE V6.00.2900.2962 X-Virus-Scanned: Symantec AntiVirus Scan Engine This is a multi-part message in MIME format. ------=_NextPart_000_009A_01C71CFF.9DAA7260 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable These electrical bugs sound like grounding problems. Running all = ground connections to a single point ground would probably clear up 90% = of them. I like Bob Nuckolls' "forest of tabs" ground system (sold by = B&C), and since using it in my last couple airplanes, have had very = clean systems in terms of noise and crosstalk. Once good grounding has = been taken care of, routing of wires is perhaps the next thing to look = at. If antenna wires can be separated, and high-current wires, = especially alternator leads, can be kept away from others, that may = help. Finally, some equipment is just not very well designed to filter = out noise. Some years ago I had an E.I. fuel quantity guage that would = go nuts every time I keyed the mic to transmit. Apparently the fuel = probes were acting as antennas, and the E.I. device had poor (or no) = input filtering. Jim Cameron Legacy N132X (reserved) ------=_NextPart_000_009A_01C71CFF.9DAA7260 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
    These electrical bugs sound like = grounding=20 problems.  Running all ground connections = to a=20 single point ground would probably clear up 90% of them.  I like = Bob=20 Nuckolls' "forest of tabs" ground system (sold by B&C), and since = using it=20 in my last couple airplanes, have had very clean systems in terms of = noise and=20 crosstalk.  Once good grounding has been taken care of, routing of = wires is=20 perhaps the next thing to look at.  If antenna wires can be = separated, and=20 high-current wires, especially alternator leads, can be kept away from = others,=20 that may help.  Finally, some equipment is just not very well = designed to=20 filter out noise.  Some years ago I had an E.I. fuel = quantity=20 guage that would go nuts every time I keyed the mic to transmit. =20 Apparently the fuel probes were acting as antennas, and the = E.I. device had=20 poor (or no) input filtering.
 
Jim Cameron
Legacy N132X (reserved)
 
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