X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Sat, 12 Aug 2006 00:03:28 -0400 Message-ID: X-Original-Return-Path: Received: from imo-d05.mx.aol.com ([205.188.157.37] verified) by logan.com (CommuniGate Pro SMTP 5.1c.2) with ESMTP id 1319260 for lml@lancaironline.net; Fri, 11 Aug 2006 22:09:52 -0400 Received-SPF: pass receiver=logan.com; client-ip=205.188.157.37; envelope-from=Sky2high@aol.com Received: from Sky2high@aol.com by imo-d05.mx.aol.com (mail_out_v38_r7.6.) id q.bce.30ed99c (39954) for ; Fri, 11 Aug 2006 22:09:02 -0400 (EDT) From: Sky2high@aol.com X-Original-Message-ID: X-Original-Date: Fri, 11 Aug 2006 22:09:01 EDT Subject: Re: [LML] Re: GPS ground plane X-Original-To: lml@lancaironline.net MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="-----------------------------1155348541" X-Mailer: 9.0 Security Edition for Windows sub 5330 X-Spam-Flag: NO -------------------------------1155348541 Content-Type: text/plain; charset="US-ASCII" Content-Transfer-Encoding: 7bit In a message dated 8/11/2006 7:22:42 P.M. Central Standard Time, dfs155@adelphia.net writes: Mike, Chat - GPS antennas don't require an external ground plane, whatever they need is internal to the antenna module. Mike, what you're calling a ground plane in the submitted photo is probably nothing more than a mounting shelf. Mine is mounted just behind my head aft of the roll-bar on the center-line on a fiberglass shelf (no metal other than the connector and cable) and does just fine (very high S/N ratio on a bunch of satellites). Mike, Chat, Dan, et al, Yes, it appears that the GPS antennae are sufficiently self-contained. Mine, like Dan's, is mounted just behind the roll-over and above the forward edge of a giant top mounted circular ADF ground plane (ADF now defunct along with my sock garters). The Garmin 430 has had no trouble finding all the satellites it needs above the horizon for RAIM approved approaches. Years ago an older GPS with a radio stack top mounted antenna had trouble in steep turns - but that was so long ago that there just weren't enough satellites, and certainly not enough in view during the turn. Scott Krueger AKA Grayhawk Lancair N92EX IO320 SB 89/96 Aurora, IL (KARR) Abnegate Exigencies! -------------------------------1155348541 Content-Type: text/html; charset="US-ASCII" Content-Transfer-Encoding: quoted-printable
In a message dated 8/11/2006 7:22:42 P.M. Central Standard Time,=20 dfs155@adelphia.net writes:
<= FONT=20 style=3D"BACKGROUND-COLOR: transparent" face=3DArial color=3D#000000 size= =3D2>Mike,=20 Chat - GPS antennas don't require an external ground plane, whatever
t= hey=20 need is internal to the antenna module. Mike, what you're calling a
gr= ound=20 plane in the submitted photo is probably nothing more than a mounting=20
shelf. Mine is mounted just behind my head aft of the roll-bar on the=20
center-line on a fiberglass shelf (no metal other than the connector a= nd=20
cable) and does just fine (very high S/N ratio on a bunch of=20 satellites).
Mike,  Chat, Dan, et al,
 
Yes, it appears that the GPS antennae are sufficiently=20 self-contained.  Mine, like Dan's, is mounted just behind the roll-over= and=20 above the forward edge of a giant top mounted circular ADF ground plane (ADF= now=20 defunct along with my sock garters). The Garmin 430 has had no trouble=20 finding all the satellites it needs above the horizon for RAIM approved=20 approaches.  Years ago an older GPS with a radio stack top mounted ante= nna=20 had trouble in steep turns - but that was so long ago that there just weren'= t=20 enough satellites, and certainly not enough in view during the turn. =20
 
Scott Krueger=20 AKA Grayhawk
Lancair N92EX IO320 SB 89/96
Aurora, IL=20 (KARR)

Abnegate Exigencies!
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