Return-Path: X-Spam-DCC: paranoid 1170; 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 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 tA3Jmffv025175 for ; Tue, 3 Nov 2015 20:48:41 +0100 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1ZthVr-0002oZ-HE for rs_out_1@blacksheep.org; Tue, 03 Nov 2015 19:44:59 +0000 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1ZthVr-0002oQ-9G for rsgb_lf_group@blacksheep.org; Tue, 03 Nov 2015 19:44:59 +0000 Received: from smtpout.karoo.kcom.com ([212.50.160.34]) by relay1.thorcom.net with esmtp (Exim 4.86) (envelope-from ) id 1ZthUn-0006MG-0P for rsgb_lf_group@blacksheep.org; Tue, 03 Nov 2015 19:44:58 +0000 X-IronPort-AV: E=Sophos;i="5.20,239,1444690800"; d="scan'208";a="138696050" Received: from unknown (HELO [127.0.0.1]) ([109.176.219.98]) by smtpout.karoo.kcom.com with ESMTP; 03 Nov 2015 19:43:36 +0000 Message-ID: <56390E67.9080708@lineone.net> Date: Tue, 03 Nov 2015 19:43:35 +0000 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: 4ead635eadbaebfaa92cfec77deb715d Subject: LF: Ferrite Rods For LF Preamplifiers 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 10.1.3.10 Status: O X-Status: X-Keywords: X-UID: 4809 Amongst some ferrite rods, I have 3 identical, all with LW & MW windings. I could remove the windings and make a fat bundle of the 3 then wind another coil for an LF preamplifier to improve on my existing one. Inductors are better not to be long and thin I know but what about the magnetic cores such as ferrite? This makes some sense, but I would rather join the rods in line, retaining a litz wire LW winding which will tune with about 470pF, ending up with an 18mm PVC tube of about 600mm and a small ABS box in the centre so the whole looks like a VHF dipole. Has anyone done this? Yesterday we were enveloped in a very wet, dripping fog and it seemed to attenuate my few LF transmissions as nobody received them. UHF TV disappeared later in the evening too. The antenna is surrounded by about 100 trees which probably doesn't help. GW4NOS was on, in S. Wales I think they had a nice, sunny day and G3XIZ also. Hugh, M0DSZ