X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Wed, 04 Mar 2009 08:13:24 -0500 Message-ID: X-Original-Return-Path: Received: from bay0-omc3-s35.bay0.hotmail.com ([65.54.246.235] verified) by logan.com (CommuniGate Pro SMTP 5.2.12) with ESMTP id 3526540 for lml@lancaironline.net; Wed, 04 Mar 2009 07:45:33 -0500 Received-SPF: pass receiver=logan.com; client-ip=65.54.246.235; envelope-from=gt_phantom@hotmail.com Received: from hotmail.com ([10.12.232.185]) by bay0-omc3-s35.bay0.hotmail.com with Microsoft SMTPSVC(6.0.3790.3959); Wed, 4 Mar 2009 04:44:55 -0800 Received: from mail pickup service by hotmail.com with Microsoft SMTPSVC; Wed, 4 Mar 2009 04:44:42 -0800 X-Original-Message-ID: Received: from 72.145.254.203 by COL0-DAV47.phx.gbl with DAV; Wed, 04 Mar 2009 12:44:41 +0000 X-Originating-IP: [72.145.254.203] X-Originating-Email: [gt_phantom@hotmail.com] X-Sender: gt_phantom@hotmail.com X-Original-Message-ID: <49AE77BA.6070304@hotmail.com> X-Original-Date: Wed, 04 Mar 2009 07:44:42 -0500 From: GT Phantom Reply-To: gt_phantom@hotmail.com Organization: None User-Agent: Thunderbird 2.0.0.19 (Windows/20081209) MIME-Version: 1.0 X-Original-To: Chris Zavatson X-Original-CC: lml@lancaironline.net Subject: Re: TruTrak autopliot and RF References: In-Reply-To: Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit X-OriginalArrivalTime: 04 Mar 2009 12:44:42.0679 (UTC) FILETIME=[FD78F470:01C99CC6] X-Original-Return-Path: gt_phantom@hotmail.com Hi Chris,

This is a known issue with TruTrak, and everyone seems to be stumped.  There is a rather long discussion about it on the Van's site here:

http://www.vansairforce.com/community/showthread.php?t=20487

TruTrak is aware of it and is searching for a solution - and has been for 4 years when I flew out there in my previous Lancair seeking a fix.

The good news?  Once you get used to it, it is very predictable and you tend to learn to simply hold the stick still while transmitting.

:(

Best regards,

Bill Reister


Chris Zavatson wrote:
A recent upgrade to more powerful com radios has introduced a bit of an undesirable problem with the Trutrak autopilot.  When the auto pilot is engaged and the #2 radio is keyed, serious pitch oscillations occur.  While the Trutrak installation materials discuss its relative immunity to RF, it does suggest shielding the lines to the control wheel steering switch. if interference is encountered.  The radio upgrade included switching from RG58 to RG142, so the overall shielding is improved, however, the antenna for the #2 radio is much closer to the autopilot wiring and hardware than the #1 antenna.  The interference appears to be be coming directly off the comm antenna and not from any 'leaks' on the way there.
Are there any tried and true fixes for making the Trutrak immune to RF?  I really didn't want to re-invent the wheel on this one. 
 
Chris Zavatson
N91CZ
L360std