Return-Path: Received: from mtain-dg09.r1000.mx.aol.com (mtain-dg09.r1000.mx.aol.com [172.29.65.17]) by air-mf05.mail.aol.com (v129.4) with ESMTP id MAILINMF054-8bec4d1a39621f4; Tue, 28 Dec 2010 14:24:18 -0500 Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by mtain-dg09.r1000.mx.aol.com (Internet Inbound) with ESMTP id 9BAE13800493A; Tue, 28 Dec 2010 14:04:35 -0500 (EST) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1PXepI-0002vN-W7 for rs_out_1@blacksheep.org; Tue, 28 Dec 2010 19:03:16 +0000 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1PXepI-0002vE-I6 for rsgb_lf_group@blacksheep.org; Tue, 28 Dec 2010 19:03:16 +0000 Received: from nm14.bullet.mail.ukl.yahoo.com ([217.146.183.188]) by relay1.thorcom.net with smtp (Exim 4.63) (envelope-from ) id 1PXepG-00029q-W2 for rsgb_lf_group@blacksheep.org; Tue, 28 Dec 2010 19:03:16 +0000 Received: from [217.146.183.181] by nm14.bullet.mail.ukl.yahoo.com with NNFMP; 28 Dec 2010 19:03:09 -0000 Received: from [217.146.183.174] by tm12.bullet.mail.ukl.yahoo.com with NNFMP; 28 Dec 2010 19:03:09 -0000 Received: from [127.0.0.1] by omp1015.mail.ukl.yahoo.com with NNFMP; 28 Dec 2010 19:03:09 -0000 X-Yahoo-Newman-Id: 37045.99114.bm@omp1015.mail.ukl.yahoo.com Received: (qmail 33375 invoked from network); 28 Dec 2010 19:03:08 -0000 DomainKey-Signature: a=rsa-sha1; q=dns; c=nofws; s=s1024; d=btopenworld.com; h=DKIM-Signature:Received:X-Yahoo-SMTP:X-YMail-OSG:X-Yahoo-Newman-Property:Message-ID:From:To:References:In-Reply-To:Subject:Date:MIME-Version:Content-Type:Content-Transfer-Encoding:X-Priority:X-MSMail-Priority:X-Mailer:X-MimeOLE; b=BKseZ0f9XU23v3qOBaudbmD6f9DymbiJB/8NYyJJKuxPu44EC9GJgDJjvYY1dgmrbRuCmTSYNLkZLw9/YHcpnWNPU+CKhD/WV7h9TMqZmaxQ4zo1THdyZzcCcelk/zEsWAznC9KNk47vGTJXZSXLlK92ShAIpkg1hIbz4jVsrJ8= ; DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=btopenworld.com; s=s1024; t=1293562988; bh=Z3J5/r/nzq4YbZO+hJhdd1Q/2qz/CChhh5sBaDeiQ9c=; h=Received:X-Yahoo-SMTP:X-YMail-OSG:X-Yahoo-Newman-Property:Message-ID:From:To:References:In-Reply-To:Subject:Date:MIME-Version:Content-Type:Content-Transfer-Encoding:X-Priority:X-MSMail-Priority:X-Mailer:X-MimeOLE; b=13z/uYpxS2ek+3VMIRQbSAzjO8nLMgcfmqB3HIOjNuOEqzXbEnPq02NqO77CuUyze7vK5krjBe8HGkIfM+T8/lmq0V2Bhbkm64JBdyYQGyAAPodqZclFtIfB2COHimRGOvcPHZGg+U4FIzQt2BfSKs+lT6QSFaKecRVRNiuqItI= Received: from JimPC (james.moritz@109.156.208.18 with login) by smtp815.mail.ukl.yahoo.com with SMTP; 28 Dec 2010 19:03:05 +0000 GMT X-Yahoo-SMTP: Cxhli3eswBD1ozmtAojhjrja86kWx0Qm9tycD5QR1DKWrOLgjJcXkw-- X-YMail-OSG: SGLHCWwVM1nO3mxDbUiAYj5_SVpIjEgYiiHo7d4tM8yYUwZ aahid61vebMXZ7kTzqLiM1Osvi6yAD1sHVsK5VnJQNbv8PgqcisVltI7Vxa1 mbPeoUCos4Nb9Lzdg2ySPRVS9wBu3HrSy3QmO9jg7jj4e7SY46UgywGrxbuU RdUuaw5rMOoN07xTvMcnGxi.J1oH3ZRPEmPaOIx7mY09dw_VCKUmdUTBDGjv vkUs3IARdgSmEI5_j9O4xX8JNH4sLoG5h2UQCINLHjUohnugYIlswEs8bIZi b2iPvzQ-- X-Yahoo-Newman-Property: ymail-3 Message-ID: From: "James Moritz" To: References: <101B609FB6D54B6D9FF4102ED3E158BE@AGB> In-Reply-To: Date: Tue, 28 Dec 2010 19:03:05 -0000 MIME-Version: 1.0 X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Windows Mail 6.0.6002.18197 X-MimeOLE: Produced By Microsoft MimeOLE V6.0.6002.18263 DomainKey-Status: good (testing) X-Spam-Score: 0.0 (/) X-Spam-Report: autolearn=disabled,UNPARSEABLE_RELAY=0.001 Subject: Re: LF: 160 to 190 KHz a real magic band ? Content-Type: text/plain; format=flowed; charset="iso-8859-1"; reply-type=response 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=0.1 required=5.0 tests=MISSING_OUTLOOK_NAME 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-global-disposition: G X-AOL-SCOLL-AUTHENTICATION: mail_rly_antispam_dkim-m268.1 ; domain : btopenworld.com DKIM : pass x-aol-sid: 3039ac1d41114d1a34c224fb X-AOL-IP: 195.171.43.25 X-AOL-SPF: domain : blacksheep.org SPF : temperror Dear Graham, LF Group, > Andy is talking about 1 watt dc feed to the PA and a short Ae The Part 15 regulations say something like "total length of antenna and earth connection less than 15m", but this seems to be open to varying interpretations ... perhaps up to "an antenna that will fit into a cylindrical space 15m high and 15m diameter". Most activity seems to happen around the top end of the band, so a dimension scaling factor of roughly 1.6 can be applied when comparing with 136k antennas. So the more optimal Lowfer antennas can compare quite well with their 136kHz counterparts. Cheers, Jim Moritz 73 de M0BMU