X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Wed, 11 Mar 2009 16:48:35 -0400 Message-ID: X-Original-Return-Path: Received: from QMTA09.emeryville.ca.mail.comcast.net ([76.96.30.96] verified) by logan.com (CommuniGate Pro SMTP 5.2.13) with ESMTP id 3543793 for lml@lancaironline.net; Wed, 11 Mar 2009 12:12:40 -0400 Received-SPF: pass receiver=logan.com; client-ip=76.96.30.96; envelope-from=jimauman@comcast.net Received: from OMTA09.emeryville.ca.mail.comcast.net ([76.96.30.20]) by QMTA09.emeryville.ca.mail.comcast.net with comcast id Rq7a1b00F0S2fkCA9sC4BA; Wed, 11 Mar 2009 16:12:04 +0000 Received: from OFFICE ([98.228.187.172]) by OMTA09.emeryville.ca.mail.comcast.net with comcast id RsC21b00p3jceaA8VsC3rF; Wed, 11 Mar 2009 16:12:04 +0000 From: "Jim Auman" X-Original-To: "'Chris Zavatson'" , References: Subject: RE: [LML] Re: TruTrak autopliot and RF X-Original-Date: Wed, 11 Mar 2009 11:12:05 -0500 X-Original-Message-ID: <3F0A835BB37346CD9D4A7577F1ACFBB0@OFFICE> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0047_01C9A23A.36BE8BF0" X-Mailer: Microsoft Office Outlook 11 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.5579 thread-index: AcmiXybyC/wbUNeBRYaXh6NRISa7cgABNZJA In-Reply-To: This is a multi-part message in MIME format. ------=_NextPart_000_0047_01C9A23A.36BE8BF0 Content-Type: text/plain; charset="US-ASCII" Content-Transfer-Encoding: 7bit Is each shield only grounded at one end of its cable? Jim _____ From: Chris Zavatson [mailto:chris_zavatson@yahoo.com] Sent: Tuesday, March 10, 2009 9:37 PM To: lml@lancaironline.net Subject: Re: [LML] Re: TruTrak autopliot and RF <> I have used separate ground lines for each system. I did some testing this weekend. I checked the impedance between ground bus, avionics racks, instrument panel and the autopilot case. -all check out good as a dead short. 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 vertical 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 autopilot completely. With the #2 antenna removed, the #1 antenna now becomes the source of strong interference with the autopilot. still scratching my head.... Chris Zavatson N91CZ L360std www.N91CZ.com ------=_NextPart_000_0047_01C9A23A.36BE8BF0 Content-Type: text/html; charset="US-ASCII" Content-Transfer-Encoding: quoted-printable

Is each shield only grounded at one = end of its cable?

Jim

From: Chris = Zavatson [mailto:chris_zavatson@yahoo.com]
Sent: Tuesday, March 10, = 2009 9:37 PM
To: = lml@lancaironline.net
Subject: Re: [LML] Re: = TruTrak autopliot and RF

<<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 ? = >>

I have used separate ground lines for each = system.

I did some testing this = weekend.

I checked the impedance between ground bus, avionics = racks, instrument panel and the autopilot case. -all check out good as a dead short.

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 vertical 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 autopilot completely. With the #2 antenna = removed, the #1 antenna now becomes the source of strong interference with the autopilot.

still scratching my = head....

Chris Zavatson

N91CZ

L360std

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