Return-Path: X-Spam-DCC: paranoid 1233; Body=2 Fuz1=2 Fuz2=2 X-Spam-Checker-Version: SpamAssassin 3.1.3 (2006-06-01) on lipkowski.org X-Spam-Level: X-Spam-Status: No, score=-0.7 required=5.0 tests=BAYES_00,DNS_FROM_AHBL_RHSBL, RATWARE_GECKO_BUILD,SPF_PASS autolearn=no version=3.1.3 Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by paranoid.lipkowski.org (8.13.7/8.13.7) with ESMTP id u3AFsPow004027 for ; Sun, 10 Apr 2016 17:54:25 +0200 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1apHcs-0000NL-4P for rs_out_1@blacksheep.org; Sun, 10 Apr 2016 16:50:14 +0100 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1apHcr-0000NC-Jk for rsgb_lf_group@blacksheep.org; Sun, 10 Apr 2016 16:50:13 +0100 Received: from smtpout.karoo.kcom.com ([212.50.160.34]) by relay1.thorcom.net with esmtp (Exim 4.87) (envelope-from ) id 1apHcq-0001tt-2y for rsgb_lf_group@blacksheep.org; Sun, 10 Apr 2016 16:50:12 +0100 X-IronPort-AV: E=Sophos;i="5.24,462,1454976000"; d="scan'208";a="100105980" Received: from unknown (HELO [127.0.0.1]) ([109.176.231.201]) by smtpout.karoo.kcom.com with ESMTP; 10 Apr 2016 16:50:10 +0100 Message-ID: <570A7631.5050001@lineone.net> Date: Sun, 10 Apr 2016 16:50:09 +0100 From: LineOne User-Agent: Mozilla/5.0 (Windows NT 5.1; rv:31.0) Gecko/20100101 Thunderbird/31.1.2 MIME-Version: 1.0 To: rsgb_lf_group@blacksheep.org X-Scan-Signature: 4ad5f3f1a9241b934aaa5d0e23c9dc57 Subject: LF: Screening an LF Loading Coil Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: 7bit 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-Scanned-By: MIMEDefang 2.56 on 10.1.3.11 Status: O X-Status: X-Keywords: X-UID: 7638 A few years ago I found an aluminium beer keg which had been used for mixing cement. As it was damaged it was no good returning it to the brewery so I have just moved my LF loading coil into it and placed the assembly outside on a corrugated steel roof. (Having the coil suspended from the shack ceiling was not a good idea for the long term). I took the end off the keg, which is 370mm internal diameter, and the coil is on a 130 mm former, likely to be no more than 160mm diameter wound. The antenna is predominantly current fed so no voltage larger than about 3kV is present. Has anyone tried this and am I likely to lose radiated power by reducing the Q of the coil, the Tx output voltage and current are just the same? Hugh, M0DSZ