Return-Path: Received: from mtain-dg02.r1000.mx.aol.com (mtain-dg02.r1000.mx.aol.com [172.29.65.10]) by air-dd03.mail.aol.com (v127_r1.1) with ESMTP id MAILINDD031-86094b8b0cb31a0; Sun, 28 Feb 2010 19:39:15 -0500 Received: from post.thorcom.com (post.thorcom.com [193.82.116.20]) by mtain-dg02.r1000.mx.aol.com (Internet Inbound) with ESMTP id ED60538000081; Sun, 28 Feb 2010 19:39:13 -0500 (EST) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1Nltdy-000277-77 for rs_out_1@blacksheep.org; Mon, 01 Mar 2010 00:37:54 +0000 Received: from [193.82.116.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1Nltdx-00026y-N7 for rsgb_lf_group@blacksheep.org; Mon, 01 Mar 2010 00:37:53 +0000 Received: from mailout10.t-online.de ([194.25.134.21]) by relay1.thorcom.net with esmtp (Exim 4.63) (envelope-from ) id 1Nltdv-0002ek-LN for rsgb_lf_group@blacksheep.org; Mon, 01 Mar 2010 00:37:53 +0000 Received: from fwd01.aul.t-online.de (fwd01.aul.t-online.de ) by mailout10.t-online.de with smtp id 1Nltds-00062K-E6; Mon, 01 Mar 2010 01:37:48 +0100 Received: from [192.168.2.32] (GvBO5-ZTghNztUKvxeDbJnKV7QPIin3T429bgaRqPZqamX1-FI3mLvipzBZOIwDZ94@[93.211.75.206]) by fwd01.t-online.de with esmtp id 1Nltdr-1y1JXU0; Mon, 1 Mar 2010 01:37:47 +0100 MIME-Version: 1.0 From: hajo.brandt.dj1zb@t-online.de To: X-Mailer: T-Online eMail 6.08.0003 Date: 01 Mar 2010 00:37 GMT Message-ID: <1Nltdr-1y1JXU0@fwd01.t-online.de> X-ID: GvBO5-ZTghNztUKvxeDbJnKV7QPIin3T429bgaRqPZqamX1-FI3mLvipzBZOIwDZ94 X-TOI-MSGID: ca173077-5657-4e59-a89f-fa643e6a67c8 X-Spam-Score: 0.6 (/) X-Spam-Report: autolearn=disabled,NO_REAL_NAME=0.55,UNPARSEABLE_RELAY=0.001 Subject: Re: LF: 9kHz/Mini Whip Content-Type: Text/Plain; Charset="ISO-8859-1" X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: X-Spam-Status: No, hits=0.3 required=5.0 tests=NO_REAL_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-sid: 3039ac1d410a4b8b0cb122ca X-AOL-IP: 193.82.116.20 Content-Transfer-Encoding: quoted-printable I would also recommend to increase the inductance of the 470uH power feed choke. I have built similar active aerials using operational amplifiers like OP27 or LT1252 (just 4 to 10 mA current consumption, so my choke is 10mH) and can receive the russian Alpha signals down to 11.9 kHz in southern Germany without problems (unless there are switched off, as it happens from time to time).=20 73 Ha-Jo, DJ1ZB "ALAN MELIA" schrieb: > Yes Laurence KL1X modified the circuit for use from 10kHz. I think it ne= eds some of the coupling caps increased in value. Alan G3NYK >On Sun, 28/2/10, Ken wrote: > From: Ken >ken.h.wright@btinternet.com> > Subject: LF: 9kHz/Mini Whip > To: >rsgb_lf_group@blacksheep.org > Date: Sunday, 28 February, 2010, 20:17 >Hi All.=20 >Has anyone had any experience using the PA0RDT Mini Whip on 9kHz?=20 >73s Ken=20 > M0KHW