X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Fri, 08 Apr 2011 15:54:11 -0400 Message-ID: X-Original-Return-Path: Received: from pop-siberian.atl.sa.earthlink.net ([207.69.195.71] verified) by logan.com (CommuniGate Pro SMTP 5.4c3j) with ESMTP id 4940516 for lml@lancaironline.net; Fri, 08 Apr 2011 10:59:33 -0400 Received-SPF: none receiver=logan.com; client-ip=207.69.195.71; envelope-from=andyw54_punt@earthlink.net Received: from user-11fa6b3.dsl.mindspring.com ([66.245.25.99] helo=andy71b082867c) by pop-siberian.atl.sa.earthlink.net with smtp (Exim 3.36 #1) id 1Q8D9H-0005li-00; Fri, 08 Apr 2011 10:59:00 -0400 X-Original-Message-ID: <36226FF6742443B881A89C05A3593712@andy71b082867c> From: "Andy Werback" X-Original-To: , "K. Gregory" References: Subject: Re: Request Electrical System Help X-Original-Date: Fri, 8 Apr 2011 07:59:00 -0700 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_006B_01CBF5C2.D2359AA0" X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2900.5931 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.5931 This is a multi-part message in MIME format. ------=_NextPart_000_006B_01CBF5C2.D2359AA0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Hi, Kevin, You should discuss this with Dynon, they might have some good = suggestions. Are your sensor leads shielded and the shields properly = grounded? That should take care of EMI from the motor, except that some = noise might be going through the power leads and into the Dynon units. = Possibly line filtering might be helpful. Another thing would be to = monitor the voltage to the Dynon and make sure that it is above the = minimum operating requirement when the gear motor runs. Andy ----- Original Message -----=20 From: K. Gregory=20 To: lml@lancaironline.net=20 Sent: Thursday, April 07, 2011 11:53 AM Subject: Request Electrical System Help I recently upgraded my 2nd-owner LNC2-235 with dual Dynon Skyview = EFIS. When completed, I discovered that each time the gear motor runs, = the output of the networked sensors (GPS, EMS, and ADAHRS) gets = interrupted, resulting in red X's displayed on screen. When the gear = cycle is complete, the EFIS returns to normal. Testing with the EFIS = system power isolated from the aircraft's electrical system by operating = only on their independent backup batteries resulted in the exact = symptom. From that I concluded that RF from the pump motor must be interfering = with the sensor signals. I then rerouted all sensor leads as far from = the pump as possible, but still had only incremental improvement. Now I'm thinking about ways of shielding the pump and it's wiring in = an effort to reduce their RF output. What I would like to know is if = anyone knows how to best accomplish this, and, if after reading this, = anyone sees an alternate possibility of what could be causing the = problem. Thanks in advance for any feedback you might have for me. Kevin Gregory LNC2 - 235 / KHND ------=_NextPart_000_006B_01CBF5C2.D2359AA0 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
Hi, Kevin,
You should discuss this with Dynon, = they might have=20 some good suggestions.  Are your sensor leads shielded and the = shields=20 properly grounded?  That should take care of EMI from the motor, = except=20 that some noise might be going through the power leads and into the = Dynon=20 units.  Possibly line filtering might be helpful.  Another = thing would=20 be to monitor the voltage to the Dynon and make sure that it is above = the=20 minimum operating requirement when the gear motor runs.
Andy
----- Original Message -----
From:=20 K. = Gregory
Sent: Thursday, April 07, 2011 = 11:53=20 AM
Subject: Request Electrical = System=20 Help

I recently upgraded my 2nd-owner = LNC2-235 with=20 dual Dynon Skyview EFIS. When completed, I discovered that each time = the gear=20 motor runs, the output of the networked sensors (GPS, EMS, and ADAHRS) = gets=20 interrupted, resulting in red X=92s displayed on screen. When the gear = cycle is=20 complete, the EFIS returns to normal. Testing with the EFIS system = power=20 isolated from the aircraft=92s electrical system by operating only on = their=20 independent backup batteries resulted in the exact = symptom.

From that I concluded that RF from the pump motor = must be=20 interfering with the sensor signals. I then rerouted all sensor leads = as far=20 from the pump as possible, but still had only incremental=20 improvement.

Now I=92m thinking about ways of shielding the = pump and it=92s=20 wiring in an effort to reduce their RF output. What I would like to = know is if=20 anyone knows how to best accomplish this, and, if after reading this, = anyone=20 sees an alternate possibility of what could be causing the=20 problem.

Thanks in advance for any feedback you might have = for=20 me.

Kevin Gregory

LNC2 =96 235 /=20 KHND

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