X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Fri, 02 Apr 2010 08:35:36 -0400 Message-ID: X-Original-Return-Path: Received: from mail-iw0-f182.google.com ([209.85.223.182] verified) by logan.com (CommuniGate Pro SMTP 5.3.5) with ESMTP id 4192528 for lml@lancaironline.net; Thu, 01 Apr 2010 17:16:56 -0400 Received-SPF: pass receiver=logan.com; client-ip=209.85.223.182; envelope-from=keith.smith@gmail.com Received: by iwn12 with SMTP id 12so132081iwn.14 for ; Thu, 01 Apr 2010 14:16:21 -0700 (PDT) DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=mime-version:date:message-id:subject:from:to:content-type; b=J8UlUYT7j83rdVSbGPyBJgRQLUPtTxTl5BGjw7rhMD82ELRcrkOX9+t4d8gj2T2Rbe MYieHCwOZtto4X8qVVh6b+Fk9Am68IsOXqu51dL+XJiLiJFK+YlTzVsirtV4Jj0qcbkc wB1KU1cHjA/g3c6k2BMHRBd8umNp7rLYVMX1Q= MIME-Version: 1.0 Received: by 10.231.119.34 with HTTP; Thu, 1 Apr 2010 14:16:21 -0700 (PDT) X-Original-Date: Thu, 1 Apr 2010 17:16:21 -0400 Received: by 10.231.152.79 with SMTP id f15mr424969ibw.19.1270156581784; Thu, 01 Apr 2010 14:16:21 -0700 (PDT) X-Original-Message-ID: Subject: GPS reception issue From: Keith Smith X-Original-To: Lancair Mailing List Content-Type: multipart/alternative; boundary=001636c92aa3ddce1b0483335ff2 --001636c92aa3ddce1b0483335ff2 Content-Type: text/plain; charset=ISO-8859-1 The signal reception on my Garmin 420 is really dodgy. We've tested the unit on a bench and it worked great. We've swapped the antenna, no change. We swapped the antenna cable, it actually got quite a bit worse (the old one had intermittent issues, the new one is dodgy, nearly full time.) If I route the cable 'just so', I can make it work fairly well on the ground with the canopy open, but it tends to go to hell when I close the canopy. If I unscrew and lift the glare shield about 1/2" - 1", the reception is great. The GPS antenna is attached to the top of the glare shield on the co-pilot side. I'm going to get some help from a shop in debugging this...but it seems to me that part of the canopy is either causing interference within the antenna cable, or the antenna itself. Has anyone experienced anything like this before? This is in a 360. Keith --001636c92aa3ddce1b0483335ff2 Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable The signal reception on my Garmin 420 is really dodgy.=A0 We've tested = the unit on a bench and it worked great.=A0 We've swapped the antenna, = no change. We swapped the antenna cable, it actually got quite a bit worse = (the old one had intermittent issues, the new one is dodgy, nearly full tim= e.)

If I route the cable 'just so', I can make it work fairly well = on the ground with the canopy open, but it tends to go to hell when I close= the canopy.=A0

If I unscrew and lift the glare shield about 1/2&qu= ot; - 1", the reception is great.=A0 The GPS antenna is attached to th= e top of the glare shield on the co-pilot side.

I'm going to get some help from a shop in debugging this...but it s= eems to me that part of the canopy is either causing interference within th= e antenna cable, or the antenna itself.

Has anyone experienced anyth= ing like this before? This is in a 360.

Keith
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