X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Tue, 03 Mar 2009 16:37:49 -0500 Message-ID: X-Original-Return-Path: Received: from web36908.mail.mud.yahoo.com ([209.191.85.76] verified) by logan.com (CommuniGate Pro SMTP 5.2.12) with SMTP id 3525349 for lml@lancaironline.net; Tue, 03 Mar 2009 12:36:08 -0500 Received: (qmail 90400 invoked by uid 60001); 3 Mar 2009 17:36:08 -0000 DomainKey-Signature: a=rsa-sha1; q=dns; c=nofws; s=s1024; d=yahoo.com; h=X-YMail-OSG:Received:X-Mailer:Date:From:Subject:To:MIME-Version:Content-Type:Message-ID; b=WN421YFvHCClBGeNjMj0Eyb+twSFJk/VHo6M5ghn4V/LvDanZqGfugkbMLNQV8kfYBYVOJfpr36p7n27baUIzt4mg1gUOlqqHkQx3jJ3ccrJapDhT/rzvl95RQ1XLmhmemOJHYZpmkFvwn2bvFy5TsxXaIcuoXc5WrtrDo+cdro=; X-YMail-OSG: vQDdIUQVM1nsihJf.boNMdfrYt6tD8wbAI9wywdln9FXr1iJ0NfhNfJPoXAnx.9yBq3MdjdXUeFjwlBNXxGXiLCGF0wQZSKyFZtyUtI0p.Di6a7USRGqFXUEbo_8WrL86kCJQJsAJda9PlgvZVmAidK44WzxtaMrIXhFrpZrNtcsOzP2o1galXVtgB9hrHZLy78xDskgddz9w8dJDJh8ZUa83hsdyqc- Received: from [149.32.224.33] by web36908.mail.mud.yahoo.com via HTTP; Tue, 03 Mar 2009 09:36:08 PST X-Mailer: YahooMailRC/1156.82 YahooMailWebService/0.7.289.1 X-Original-Date: Tue, 3 Mar 2009 09:36:08 -0800 (PST) From: Chris Zavatson Subject: TruTrak autopliot and RF X-Original-To: Lancair Mailing List MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="0-1563969286-1236101768=:80304" X-Original-Message-ID: <516014.80304.qm@web36908.mail.mud.yahoo.com> --0-1563969286-1236101768=:80304 Content-Type: text/plain; charset=iso-8859-1 Content-Transfer-Encoding: quoted-printable A recent upgrade to more powerful com radios has introduced a bit of an und= esirable problem with the Trutrak autopilot.=A0 When the auto pilot is enga= ged and the #2 radio is keyed, serious pitch oscillations occur.=A0 While t= he Trutrak installation materials discuss its relative immunity to RF, it d= oes suggest shielding the lines to the control wheel steering switch. if in= terference is encountered.=A0 The radio upgrade included switching from RG5= 8 to RG142, so the overall shielding is improved, however, the antenna=A0fo= r the #2 radio is much closer to the autopilot wiring and hardware than the= #1 antenna.=A0=A0The interference appears to be be=A0coming directly off t= he comm antenna and not from any 'leaks'=A0on the way there.=0AAre there an= y=A0tried and true=A0fixes for making the Trutrak immune to RF?=A0 I really= didn't want to=A0re-invent the wheel on this one.=A0=0A=0AChris Zavatson= =0AN91CZ=0AL360std=0Awww.N91CZ.com=0A=0A=0A --0-1563969286-1236101768=:80304 Content-Type: text/html; charset=iso-8859-1 Content-Transfer-Encoding: quoted-printable
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A recent upgrade to more powerful com radios has introduced a b= it of an undesirable problem with the Trutrak autopilot.  When the aut= o pilot is engaged and the #2 radio is keyed, serious pitch oscillations oc= cur.  While the Trutrak installation materials discuss its relative im= munity to RF, it does suggest shielding the lines to the control wheel stee= ring switch. if interference is encountered.  The radio upgrade includ= ed switching from RG58 to RG142, so the overall shielding is improved, howe= ver, the antenna for the #2 radio is much closer to the autopilot wiri= ng and hardware than the #1 antenna.  The interference appears to= be be coming directly off the comm antenna and not from any 'leaks'&n= bsp;on the way there.
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Are there any tried and true f= ixes for making the Trutrak immune to RF?  I really didn't want to&nbs= p;re-invent the wheel on this one. 
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C= hris Zavatson
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N91CZ
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L360std
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