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 [69.146.254.20] (HELO arilabs.net) by logan.com (CommuniGate Pro SMTP 5.2.12) with ESMTP id 3525865 for lml@lancaironline.net; Tue, 03 Mar 2009 16:44:52 -0500 Received-SPF: none receiver=logan.com; client-ip=69.146.254.20; envelope-from=Kevin@arilabs.net Subject: RE: [LML] TruTrak autopliot and RF MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----_=_NextPart_001_01C99C49.33646F06" Content-class: urn:content-classes:message X-Original-Date: Tue, 3 Mar 2009 14:44:14 -0700 X-MimeOLE: Produced By Microsoft Exchange V6.5 X-Original-Message-ID: <7141427652BB3049A7DBF1084B67805B1E3008@penumbra.arilabs.net> X-MS-Has-Attach: X-MS-TNEF-Correlator: Thread-Topic: [LML] TruTrak autopliot and RF Thread-Index: AcmcSFW3kOIiVQ3/RXeVBu1ZQvoEiAAAKteQ From: "Kevin Stallard" X-Original-To: "Lancair Mailing List" This is a multi-part message in MIME format. ------_=_NextPart_001_01C99C49.33646F06 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable So you've sprung a leak? I thought proper grounding of the antenna would prevent stuff like this. =20 =20 Try putting some soap and water around the antenna, look for bubbles... =20 You can then patch the leak with some copper foil ;) =20 Kevin =20 ________________________________ From: Lancair Mailing List [mailto:lml@lancaironline.net] On Behalf Of Chris Zavatson Sent: 2009-03-03 14:38 To: lml@lancaironline.net Subject: [LML] TruTrak autopliot and RF =20 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.=20 =20 Chris Zavatson N91CZ L360std www.N91CZ.com =20 =20 ------_=_NextPart_001_01C99C49.33646F06 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

So you’ve sprung a leak? I thought proper = grounding of the antenna would prevent stuff like this. =

Try putting some soap and water around the antenna, = look for bubbles…

You can then patch the leak with some copper foil = ;)

Kevin

From: = Lancair Mailing List [mailto:lml@lancaironline.net] On Behalf Of Chris Zavatson
Sent: 2009-03-03 = 14:38
To: = lml@lancaironline.net
Subject: [LML] TruTrak = autopliot and RF

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

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