Return-Path: Sender: (Marvin Kaye) To: lml@lancaironline.net Date: Wed, 16 Jun 2004 08:36:12 -0400 Message-ID: X-Original-Return-Path: Received: from imo-d21.mx.aol.com ([205.188.144.207] verified) by logan.com (CommuniGate Pro SMTP 4.2b5) with ESMTP id 164420 for lml@lancaironline.net; Wed, 16 Jun 2004 04:30:01 -0400 Received: from Sky2high@aol.com by imo-d21.mx.aol.com (mail_out_v37_r2.6.) id q.4d.4020a3ac (4254) for ; Wed, 16 Jun 2004 04:29:25 -0400 (EDT) From: Sky2high@aol.com X-Original-Message-ID: <4d.4020a3ac.2e015ee5@aol.com> X-Original-Date: Wed, 16 Jun 2004 04:29:25 EDT Subject: Re: [LML] ELT ground plane X-Original-To: lml@lancaironline.net MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="-----------------------------1087374565" X-Mailer: 9.0 for Windows sub 5000 -------------------------------1087374565 Content-Type: text/plain; charset="US-ASCII" Content-Transfer-Encoding: 7bit In a message dated 6/15/2004 11:41:30 PM Central Standard Time, spry@ihug.co.nz writes: Can anybody help me with the sizing of a ground plane for the ELT. I wish to keep the size as small as possible and seem to recall reading somewhere that a 5" CD has been used with some success and with little discernable difference from using a larger copper/aluminium one as recommended by the manufacturers. John, Verrry Interrrresting..... Are you still in a fiberglass airplane? If so, is the ELT broadcasting only on 121.5? If so, an internally mounted Comm antenna should work without any ground plane - such as a foil "Z", etc. A vertically polarized antenna with a ground plane would seem to only work well if the crash left the plane in a normal flying/landing orientation. Upside down or tail sticking up might not transmit enough signal ... maybe? I am not familar with the antenna requirements for the higher frequency ELTs. Scott Krueger AKA Grayhawk Sky2high@aol.com II-P N92EX IO320 Aurora, IL (KARR) LML, where ideas collide and you decide! -------------------------------1087374565 Content-Type: text/html; charset="US-ASCII" Content-Transfer-Encoding: quoted-printable

In a message dated 6/15/2004 11:41:30 PM Central Standard Time,=20 spry@ihug.co.nz writes:

<= FONT=20 style=3D"BACKGROUND-COLOR: transparent" face=3DArial color=3D#000000 size= =3D2>Can=20 anybody help me with the sizing of a ground plane for the ELT.

I wi= sh=20 to keep the size as small as possible and seem to recall reading
somewh= ere=20 that a 5" CD has been used with some success and with little
discernabl= e=20 difference from using a larger copper/aluminium one as
recommended by t= he=20 manufacturers.

John,

Verrry Interrrresting.....

Are you still in a fiberglass airplane? If so, is the ELT=20 broadcasting only on 121.5? If so, an internally mounted Comm antenna=20 should work without any ground plane - such as a foil "Z", etc.

A vertically polarized antenna with a ground plane would seem to o= nly=20 work well if the crash left the plane in a normal flying/landing=20 orientation. Upside down or tail sticking up might not transmit enough= =20 signal ... maybe?

I am not familar with the antenna requirements for the higher frequency= =20 ELTs. =20

Scott Krueger=20 AKA Grayhawk
Sky2high@aol.com
II-P N92EX IO320 Aurora, IL=20 (KARR)

LML, where ideas collide and you=20 decide!

-------------------------------1087374565--