Return-Path: Received: (qmail 27469 invoked from network); 8 Mar 1999 11:18:29 -0000 Received: from magnet.plus.net.uk (HELO magnet.force9.net) (195.166.128.26) by medusa.plus.net.uk with SMTP; 8 Mar 1999 11:18:29 -0000 Received: (qmail 378 invoked from network); 8 Mar 1999 11:20:41 -0000 Received: from post.thorcom.com (194.75.130.70) by magnet.plus.net.uk with SMTP; 8 Mar 1999 11:20:41 -0000 Received: from troy.blacksheep.org ([194.75.183.50] ident=root) by post.thorcom.com with esmtp (Exim 2.04 #3) id 10Jy5Z-0001vw-00; Mon, 8 Mar 1999 11:20:49 +0000 Received: (from root@localhost) by troy.blacksheep.org (8.6.12/8.6.12) id LAA30433 for rsgb_lf_group-outgoing; Mon, 8 Mar 1999 11:17:13 GMT X-Priority: 3 X-MSMail-Priority: Normal Received: from post.thorcom.com (root@post.unica.co.uk [194.75.183.70]) by troy.blacksheep.org (8.6.12/8.6.12) with ESMTP id LAA30335 for ; Mon, 8 Mar 1999 11:08:53 GMT Received: from bw85zhb.bluewin.ch ([195.186.1.75]) by post.thorcom.com with esmtp (Exim 2.04 #3) id 10JxxK-0001ZO-00 for rsgb_lf_group@blacksheep.org; Mon, 8 Mar 1999 11:12:18 +0000 Received: from phonakcom.ch ([195.186.58.49]) by bw85zhb.bluewin.ch ( with ESMTP id AAA179D for ; Mon, 8 Mar 1999 12:08:11 +0100 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1106 Message-ID: <36E3B1B5.24DD078B@phonakcom.ch> Date: Mon, 08 Mar 1999 12:17:09 +0100 From: "Toni Baertschi" Organization: Phonak Communications AG X-Mailer: Mozilla 4.03 [de] (WinNT; I) MIME-Version: 1.0 To: rsgb_lf_group@blacksheep.org Subject: Re: LF: Care and feeding of a top-loaded vertical References: <19990307.110153.-129921.2.riese-k3djc@juno.com> Content-Type: text/plain; charset=us-ascii; format=flowed Content-Transfer-Encoding: 8bit Sender: Precedence: bulk Reply-To: rsgb_lf_group@blacksheep.org from HB9ASB Hello Bob, I'm using a helical vertical for more than a year and it works fine. The lower part (7m) is a PVC irrigation pipe (11cm Diameter) the upper part a Kevlar fishing pole (8m). I've wound about 350m of Liz wire on it. Top load is a 60m long wire going up to 18m and then down to 8m, zigzag over my 30*40m property. Self resonance of the whole thing is around 170 kHz and I match it to the coax via an autotransformer (abt. 1mH), wound on a plastic waste-paper basket. For comparison I've built exactly the same antenna a few meters away but with a straight wire instead of the helical. The helical was always 3 or more dB's better, on transmit and on reception. I think the helical is good for some more dB's if you can make the diameter larger (a handling problem, hi). 73 de Toni Bob RIESE schrieb: > > Has anyone done anything with a continuously loaded vertical and top hat. > 40 Ft of large diameter plastic pipe wound with copper wire would be a > rubber duckie on LF, the only problem I see would to keep it from acting > like a Tesla Coil > > Bob K3DJC > ___________________________________________________________________ > You don't need to buy Internet access to use free Internet e-mail. > Get completely free e-mail from Juno at http://www.juno.com/getjuno.html > or call Juno at (800) 654-JUNO [654-5866]