X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml Date: Sun, 08 Oct 2006 17:58:44 -0400 Message-ID: X-Original-Return-Path: <5zq@cox.net> Received: from centrmmtao06.cox.net ([70.168.83.78] verified) by logan.com (CommuniGate Pro SMTP 5.1c.5) with ESMTP id 1449841 for lml@lancaironline.net; Sun, 08 Oct 2006 16:42:59 -0400 Received-SPF: none receiver=logan.com; client-ip=70.168.83.78; envelope-from=5zq@cox.net Received: from eastrmimpo02.cox.net ([68.1.16.120]) by centrmmtao06.cox.net (InterMail vM.6.01.06.01 201-2131-130-101-20060113) with ESMTP id <20061008204232.YCYN1780.centrmmtao06.cox.net@eastrmimpo02.cox.net> for ; Sun, 8 Oct 2006 16:42:32 -0400 Received: from OFFICE ([72.192.254.103]) by eastrmimpo02.cox.net with bizsmtp id Xwhy1V00S2EdYPc0000000 Sun, 08 Oct 2006 16:42:02 -0400 X-Original-Message-ID: <000c01c6eb1a$4470d480$6401a8c0@OFFICE> From: "Bill&Sue" <5zq@cox.net> X-Original-To: "Lancair Mailing List" References: Subject: Re: [LML] Good Com antenna X-Original-Date: Sun, 8 Oct 2006 16:42:27 -0400 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0009_01C6EAF8.BD2AB700" X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2900.2869 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.2962 This is a multi-part message in MIME format. ------=_NextPart_000_0009_01C6EAF8.BD2AB700 Content-Type: text/plain; charset="Windows-1252" Content-Transfer-Encoding: quoted-printable Hi Paul, This sounds like a great antenna, but I'm having a bit of trouble = getting a picture of it in my mind. Any chance that you could publish a = diagram or sketch of this thing? Thanks. Bill Harrelson N5ZQ 320 1,250 hrs and holding N6ZQ IV holding for the 320 ----- Original Message -----=20 From: Paul Lipps=20 To: Lancair Mailing List=20 Sent: Saturday, October 07, 2006 10:05 PM Subject: [LML] Good Com antenna Here's a half-wave com antenna design that is easy to make and has a = very broad bandwidth and reasonably small size. It was tested to have a = VSWR of 1.3:1 or less from 110 MHz to 146 MHz, and 1.10:1 from 122MHz to = 130MHz. It was tested while fastened to a 1/4" fibreglass-coated foam = plate. It is made from two triangular arc pieces of thin aluminum and a = 24" long, 3'8" ID soft aluminum tube. The two triangles have a chord at = the outer ends of 13" with a 15 1/4" radius. Separate the inner points = by about 1/2". The antenna is fed through the tube which forms a bazooka = balun. The tube is attached but electrically isolated from one antenna = half with one end near the feed points. The coax shield is connected to = that antenna half feed point, and the center conductor to the other. The = coax shield is also connected to the other end of the tube. This is done = by stripping the outer dielectric from the coax and running a wire = around the bared shield and the end of the tube. It is also possible to = use one or two 1/4" ID X 1" long ferrites around the coax at the = feed-point to form a quasi-balun. This would allow the coax to leave the = array in the preferred perpendicular direction from the line of the = array. The The antenna can be mounted onto the curved fuselage in a = vertical orientation. Because it is a half-wave dipole, it has its best = radiation pattern normal to the array toward the horizon. As with all = antennas, it is best to keep it at least one wavelength, 8' or more, = from any metal that is in a parralel orientation to the antenna to = prevent deep pattern nulls. ------=_NextPart_000_0009_01C6EAF8.BD2AB700 Content-Type: text/html; charset="Windows-1252" Content-Transfer-Encoding: quoted-printable
Hi Paul,
 
This sounds like a great antenna, but = I'm having a=20 bit of trouble getting a picture of it in my mind. Any chance that = you=20 could publish a diagram or sketch of this thing? Thanks.
 
Bill Harrelson
N5ZQ 320 1,250 hrs and = holding
N6ZQ  IV holding for the = 320
 
 
 
----- Original Message -----
From:=20 Paul=20 Lipps
Sent: Saturday, October 07, = 2006 10:05=20 PM
Subject: [LML] Good Com = antenna

Here's a half-wave com antenna design = that is easy=20 to make and has a very broad bandwidth and reasonably small size. It = was=20 tested to have a VSWR of 1.3:1 or less from 110 MHz to 146 MHz, = and=20 1.10:1 from 122MHz to 130MHz. It was tested while fastened to a = 1/4"=20 fibreglass-coated foam plate. It is made from two triangular = arc pieces of thin aluminum and a 24" long, 3'8" ID soft = aluminum=20 tube. The two triangles have a chord at the outer ends of 13" with a = 15 1/4"=20 radius. Separate the inner points by about 1/2". The antenna is fed = through=20 the tube which forms a bazooka balun. The tube is attached but = electrically=20 isolated from one antenna half with one end  near the feed = points. The=20 coax shield is connected to that antenna half feed point, and the = center=20 conductor to the other. The coax shield is also connected to the other = end of=20 the tube. This is done by stripping the outer dielectric from the coax = and=20 running a wire around the bared shield and the end of the tube. It is = also=20 possible to use one or two 1/4" ID X 1" long ferrites around the coax = at the=20 feed-point to form a quasi-balun. This would allow the coax to leave = the array=20 in the preferred perpendicular direction from the line of the = array.=20 The The antenna can be mounted onto the curved fuselage in a = vertical=20 orientation. Because it is a half-wave dipole, it has its best = radiation=20 pattern normal to the array toward the horizon. As with all = antennas, it=20 is best to keep it at least one wavelength, 8' or more, from any = metal=20 that is in a parralel orientation to the antenna to prevent = deep=20 pattern nulls.
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