X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Mon, 13 Feb 2006 13:49:48 -0500 Message-ID: X-Original-Return-Path: Received: from smtp107.sbc.mail.mud.yahoo.com ([68.142.198.206] verified) by logan.com (CommuniGate Pro SMTP 5.0.8) with SMTP id 981931 for lml@lancaironline.net; Sun, 12 Feb 2006 13:23:35 -0500 Received-SPF: none receiver=logan.com; client-ip=68.142.198.206; envelope-from=elippse@sbcglobal.net Received: (qmail 93878 invoked from network); 12 Feb 2006 18:22:51 -0000 Received: from unknown (HELO Computerroom) (elippse@sbcglobal.net@66.122.69.226 with login) by smtp107.sbc.mail.mud.yahoo.com with SMTP; 12 Feb 2006 18:22:51 -0000 X-Original-Message-ID: <000501c63001$570c1cf0$e2457a42@Computerroom> From: "Paul Lipps" X-Original-To: Subject: Counterpoise (ground-plane) antennas X-Original-Date: Sun, 12 Feb 2006 10:22:43 -0800 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0002_01C62FBE.430153D0" 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_0002_01C62FBE.430153D0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable If you guys would like to EXPERIMENT (now where have I heard that = word before), you might try this. Those V-shaped antennas you see on the = vertical stab are balanced antennas; they need no ground plane, They = have a balun inside that transforms the unbalanced coax to the balanced = antenna. This antenna is a little longer than the com antenna as it = operates at a little lower frequency. The geometric mean frequency of = VOR is 113.1MHz, and of comm is 127.9MHz. Cutting the V to the length of = 113.1/127.9 and inserting it through the HORIZONTAL stab will give you = an excellent balanced dipole with a true hemispherical radiation pattern = with maximum radiation toward the horizon, not the reduced horizontal = radiation of the counterpoise antenna with a finite (30") counterpoise. = You could even put one on either side for a dual radio system to give a = balanced appearance. "Course, this should only be tried by the real = experimenters who are more interested in performance than having an = unusual-appearing airplane. Orthodoxy is to be upheld at all costs! ------=_NextPart_000_0002_01C62FBE.430153D0 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
    If you guys would like to = EXPERIMENT=20 (now where have I heard that word before), you might try this. Those = V-shaped=20 antennas you see on the vertical stab are balanced antennas; they need = no ground=20 plane, They have a balun inside that transforms the unbalanced coax to = the=20 balanced antenna. This antenna is a little longer than the com antenna = as it=20 operates at a little lower frequency. The geometric mean = frequency of=20 VOR is 113.1MHz, and of comm is 127.9MHz. Cutting the V to the = length=20 of 113.1/127.9 and inserting it through the HORIZONTAL stab will give = you an=20 excellent balanced dipole with a true hemispherical radiation pattern = with=20 maximum radiation toward the horizon, not the reduced horizontal = radiation of=20 the counterpoise antenna with a finite (30") counterpoise. You could = even put=20 one on either side for a dual radio system to give a balanced=20 appearance. "Course, this should only be tried by the real = experimenters=20 who are more interested in performance than having = an unusual-appearing=20 airplane.
 
Orthodoxy is to be upheld at = all=20 costs!
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