X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Tue, 10 Mar 2009 22:36:35 -0400 Message-ID: X-Original-Return-Path: Received: from web36903.mail.mud.yahoo.com ([209.191.85.71] verified) by logan.com (CommuniGate Pro SMTP 5.2.13) with SMTP id 3540624 for lml@lancaironline.net; Mon, 09 Mar 2009 14:45:24 -0400 Received: (qmail 58961 invoked by uid 60001); 9 Mar 2009 18:45:23 -0000 DomainKey-Signature:a=rsa-sha1; q=dns; c=nofws; s=s1024; d=yahoo.com; h=Message-ID:X-YMail-OSG:Received:X-Mailer:References:Date:From:Subject:To:In-Reply-To:MIME-Version:Content-Type; b=x837RSRpZg8IppZkyGCuwOBWC8hiD14ogEZAjkXy394DE6B1pWd3RSWL+12uEY9e/h4OctPL/RVV9P3eb+UEGgBvW61mS9fhmCllTZK5x1xuK5GXztytJ1fGYa8dh1pk2JZOZQkBPjMNAw+qTTm2xqQDF6MdBt9ZfcCg7qWNu7g=; X-Original-Message-ID: <23105.57371.qm@web36903.mail.mud.yahoo.com> X-YMail-OSG: lIAYJzIVM1leGjL8OQSCORz5FDL7XZdsuZRNKoU1mcrZ5MLwvuIpnWfh1mjaYeik0JSPok0.v8wAU.XUN15ZuS_ARQFvJe7Z5171q9AIkGg4AtPs.Lb9BJwno27ZP0j8zY63QB4kSrC7axztSZ3Xm9p9EE1UYp0vMWsgXJz3eMH7jBwB0Mvds_5Oh5iOWsX5Im7AcNd1Vb30jVfct3nTGThCMWFp211fdsQs8L17RdB8 Received: from [149.32.224.34] by web36903.mail.mud.yahoo.com via HTTP; Mon, 09 Mar 2009 11:45:22 PDT X-Mailer: YahooMailRC/1277.29 YahooMailWebService/0.7.289.1 References: X-Original-Date: Mon, 9 Mar 2009 11:45:22 -0700 (PDT) From: Chris Zavatson Subject: Re: [LML] Re: TruTrak autopliot and RF X-Original-To: Lancair Mailing List In-Reply-To: MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="0-1452710694-1236624322=:57371" --0-1452710694-1236624322=:57371 Content-Type: text/plain; charset=iso-8859-1 Content-Transfer-Encoding: quoted-printable =0A=0A<>= =0A=0AI have used separate ground lines for each system.=0AI did some testi= ng this weekend.=0AI checked the impedance between ground bus, avionics rac= ks, instrument panel and the autopilot case. -all check out good as a dead = short.=A0 =0A=0AIt is=A0the #2 antenna (bent wip mounted to an aluminum pla= tform in the tail cone) has a big impact on the auto pilot.=A0 The #1 anten= na (Bob Archer in the vertical stab) has a small, barely perceptible impact= if tested on the ground.=A0 Physically moving the=A0#2 antenna from the ta= il cone to outside near the passenger side wing tip eliminates its interfer= ence with the autopilot completely.=A0 With the #2 antenna removed, the #1 = antenna now becomes the source of strong interference with the autopilot.= =A0=0A=0Astill scratching my head....=0A=0A=0AChris Zavatson=0AN91CZ=0AL360= std=0Awww.N91CZ.com=0A=0A=0A --0-1452710694-1236624322=:57371 Content-Type: text/html; charset=iso-8859-1 Content-Transfer-Encoding: quoted-printable
 
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<<Are people using a common ground wire= for the radio PTT and any Auto Pilot
switches ?  ... If so did you= try to run separate grounds ? >>
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I = have used separate ground lines for each system.
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I did some te= sting this weekend.
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I checked the impedance between ground bus= , avionics racks, instrument panel and the autopilot case. -all check out g= ood as a dead short. 
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It is the= #2 antenna (bent wip mounted to an aluminum platform in the tail cone) has= a big impact on the auto pilot.  The #1 antenna (Bob Archer in the ve= rtical stab) has a small, barely perceptible impact if tested on the ground= .  Physically moving the #2 antenna from the tail cone to outside= near the passenger side wing tip eliminates its interference with the auto= pilot completely.  With the #2 antenna removed, the #1 antenna now bec= omes the source of strong interference with the autopilot. 
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still scratching my head....
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Chris Zavatson
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N91CZ
=0AL360std
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