X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Thu, 27 Oct 2005 16:49:49 -0400 Message-ID: X-Original-Return-Path: Received: from mail.pshift.com ([63.166.217.30] verified) by logan.com (CommuniGate Pro SMTP 5.0c7) with ESMTP id 790752 for lml@lancaironline.net; Thu, 27 Oct 2005 15:59:35 -0400 Received-SPF: none receiver=logan.com; client-ip=63.166.217.30; envelope-from=colyncase@earthlink.net Received: from ccaselt (unverified [206.229.199.193]) by mail.pshift.com (Vircom SMTPRS 4.1.361.21) with SMTP id for ; Thu, 27 Oct 2005 15:58:21 -0400 X-Original-Message-ID: <00dc01c5db30$c701e330$0202a8c0@nvidia.com> From: "colyncase on earthlink" X-Original-To: "Lancair Mailing List" References: Subject: Re: [LML] TCAD Antenna's on a Legacy X-Original-Date: Thu, 27 Oct 2005 12:58:18 -0700 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_00D9_01C5DAF6.1A647B90" X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2900.2180 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.2180 This is a multi-part message in MIME format. ------=_NextPart_000_00D9_01C5DAF6.1A647B90 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Ryan also specifies that the wire length to the top and bottom antennas = be precisely the same. I'm not sure if this is about propagation delay, impedance or what. = ....but if the former, then they would probably want the bottom antenna precisely under the top = antenna. Colyn ----- Original Message -----=20 From: Craig Berland=20 To: Lancair Mailing List=20 Sent: Thursday, October 27, 2005 12:35 PM Subject: [LML] TCAD Antenna's on a Legacy Ron said: I need some advice on where to place the TCAD antenna's on a = Legacy. Ron I feel your pain. I have been working on putting external = antennas on my IV-P for 3 months. Nobody wants to give much advice. = Here's what I have peened out of Ryan and Lancair Avionics. The top = antenna should be at the highest point of the fuselage so as to not = block its visibility fore and aft. On the IV-P this is near the door. = The lower antenna just needs to be 24 inches from any other antenna. If = you have to violate this dimension, make sure it is not relative to the = transponder antenna. They do not like each other due to similar = frequencies. All antennas want a 36 inch diameter ground plane. I have = chose to use the "paint on" ground plane. You do not use the rubber = antenna pads when using the paint on ground plane. Even on the IV-P = there is not enough room to get 36 inch ground planes on all antennas. = I have two com antennas, transponder and TCAD antenna on the belly. I = do have 24 inches from the TCAD to any other antenna. This required = moving the 2nd com antenna back behind the main gear doors, similar to = the location used on the Columbia. The next big thing is making sure = the antennas do not interfere with "other stuff" inside the fuselage. = I'm still concerned about this. Hope there is some new bit of info = here. Craig Berland ------=_NextPart_000_00D9_01C5DAF6.1A647B90 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
Ryan also specifies that the wire = length to the top=20 and bottom antennas be precisely the same.
I'm not sure if this is about = propagation delay,=20 impedance or what.   ....but if the former, then
they would probably want the bottom = antenna=20 precisely under the top antenna.
 
Colyn
----- Original Message -----
From:=20 Craig=20 Berland
Sent: Thursday, October 27, = 2005 12:35=20 PM
Subject: [LML] TCAD Antenna's = on a=20 Legacy

Ron said: I need some = advice on=20 where to place the TCAD antenna's on a = Legacy.
 
Ron I feel your = pain.  I=20 have been working on putting external antennas on my IV-P for 3 = months. =20 Nobody wants to give much advice.  Here's what I have peened = out of=20 Ryan and Lancair Avionics.  The top antenna should be at the = highest=20 point of the fuselage so as to not block its visibility fore and = aft.  On=20 the IV-P this is near the door.  The lower antenna just = needs to be=20 24 inches from any other antenna.  If you have to violate this = dimension,=20 make sure it is not relative to the transponder antenna.  They do = not=20 like each other due to similar frequencies.  All antennas = want a 36=20 inch diameter ground plane.  I have chose to use the "paint on" = ground=20 plane.  You do not use the rubber antenna pads when using the = paint on=20 ground plane.  Even on the IV-P there is not enough room to get = 36 inch=20 ground planes on all antennas.  I have two com antennas, = transponder and=20 TCAD antenna on the belly.  I do have 24 inches from the TCAD to = any=20 other antenna.  This required moving the 2nd com antenna back = behind the=20 main gear doors, similar to the location used on the Columbia.  = The next=20 big thing is making sure the antennas do not interfere with "other = stuff"=20 inside the fuselage.  I'm still concerned about this.  Hope = there is=20 some new bit of info here.
Craig=20 Berland
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