Return-Path: Received: from rly-md04.mx.aol.com (rly-md04.mail.aol.com [172.20.29.142]) by air-md04.mail.aol.com (v121_r4.4) with ESMTP id MAILINMD043-900493973315c; Fri, 05 Dec 2008 13:30:25 -0500 Received: from post.thorcom.com (post.thorcom.com [193.82.116.20]) by rly-md04.mx.aol.com (v121_r4.4) with ESMTP id MAILRELAYINMD048-900493973315c; Fri, 05 Dec 2008 13:30:10 -0500 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1L8fR3-0004cv-Kr for rs_out_1@blacksheep.org; Fri, 05 Dec 2008 18:29:53 +0000 Received: from [83.244.159.144] (helo=relay3.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1L8fR3-0004cm-8D for rsgb_lf_group@blacksheep.org; Fri, 05 Dec 2008 18:29:53 +0000 Received: from smtp-vbr6.xs4all.nl ([194.109.24.26]) by relay3.thorcom.net with esmtp (Exim 4.63) (envelope-from ) id 1L8fR2-0003VC-It for rsgb_lf_group@blacksheep.org; Fri, 05 Dec 2008 18:29:53 +0000 Received: from organisa-c1c456 (ndb.demon.nl [82.161.81.65]) by smtp-vbr6.xs4all.nl (8.13.8/8.13.8) with ESMTP id mB5ITp0s057189 for ; Fri, 5 Dec 2008 19:29:51 +0100 (CET) (envelope-from roelof@ndb.demon.nl) Date: Fri, 05 Dec 2008 18:29:32 -0000 To: rsgb_lf_group@blacksheep.org From: "Roelof Bakker" MIME-Version: 1.0 References: Message-ID: In-Reply-To: User-Agent: Opera Mail/9.62 (Win32) X-Virus-Scanned: by XS4ALL Virus Scanner X-Spam-Score: 0.0 (/) X-Spam-Report: autolearn=disabled,none Subject: Re: LF: E field active antennas Content-Type: text/plain; format=flowed; delsp=yes; charset=iso-8859-15 Content-Transfer-Encoding: 7bit X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: X-Spam-Status: No, hits=0.0 required=5.0 tests=none autolearn=no version=2.63 X-SA-Exim-Scanned: Yes Sender: owner-rsgb_lf_group@blacksheep.org Precedence: bulk Reply-To: rsgb_lf_group@blacksheep.org X-Listname: rsgb_lf_group X-SA-Exim-Rcpt-To: rs_out_1@blacksheep.org X-SA-Exim-Scanned: No; SAEximRunCond expanded to false X-AOL-IP: 193.82.116.20 X-Mailer: Unknown (No Version) Hello Andy, There is a commercial design that uses a helical wound whip element. The main purpose is to decrease the length of the whip, so you have the same performance with a smaller overall length. I have not tested this myself, but it might be possible that the added inductance does improve performance above about 10 - 15 MHz. At lower frequencies the antenna element works more like a capacitance than as a traditional antenna with voltage and current distrubution. The best way to find out is to try it! Though with current conditions it will be a bit difficult to evaluate propagation above 20 MHz. Best regards, Roelof Bakker, pa0rdt