X-GM-THRID: 1200536038900871949 X-Gmail-Labels: rsgb lf X-Gmail-Received: c8dc2d1d957f6e85ca303e7ad54e5d6440ae5989 Delivered-To: daveyxm@gmail.com Received: by 10.54.70.6 with SMTP id s6cs31455wra; Thu, 13 Apr 2006 02:26:26 -0700 (PDT) Received: by 10.54.97.20 with SMTP id u20mr218426wrb; Thu, 13 Apr 2006 02:26:26 -0700 (PDT) Return-Path: Received: from post.thorcom.com (post.thorcom.com [193.82.116.20]) by mx.gmail.com with ESMTP id 6si371613wrh.2006.04.13.02.26.24; Thu, 13 Apr 2006 02:26:26 -0700 (PDT) Received-SPF: neutral (gmail.com: 193.82.116.20 is neither permitted nor denied by best guess record for domain of owner-rsgb_lf_group@blacksheep.org) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1FTy2k-0003Sz-Jo for rs_out_1@blacksheep.org; Thu, 13 Apr 2006 10:23:14 +0100 Received: from [193.82.59.130] (helo=relay2.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1FTy2j-0003Sq-Ua for rsgb_lf_group@blacksheep.org; Thu, 13 Apr 2006 10:23:14 +0100 Received: from smtp05.wanadoo.nl ([194.134.35.145]) by relay2.thorcom.net with esmtp (Exim 4.51) id 1FTzJ6-0003pU-Rv for rsgb_lf_group@blacksheep.org; Thu, 13 Apr 2006 11:44:14 +0100 Received: from pa3fnyzus90725 (cd4400af3.cable.wanadoo.nl [212.64.10.243]) by smtp5.wanadoo.nl (Postfix) with SMTP id 23ECA35191 for ; Thu, 13 Apr 2006 11:22:41 +0200 (CEST) From: "Victor van kooten" To: "blacksheep" Date: Thu, 13 Apr 2006 11:22:31 +0200 Message-ID: MIME-Version: 1.0 X-Priority: 3 (Normal) X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook IMO, Build 9.0.2416 (9.0.2911.0) X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.2869 Importance: Normal X-Spam-Score: 0.3 (/) X-Spam-Report: autolearn=disabled,AWL=0.307 Subject: LF: preamp Content-Type: multipart/mixed; boundary="----=_NextPart_000_0013_01C65EEC.8E418830" 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 Status: O X-Status: X-Keywords: X-UID: 6802 This is a multi-part message in MIME format. ------=_NextPart_000_0013_01C65EEC.8E418830 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: 7bit Hello all, since some months I am listening to the 136KHz band with a Icom IC761,this is a good HF tranceiver but on longwave it has some intermodulation problems with local broadcasting stations on 675KHz and higher.To solve this I build a narrowband preamp,also suitable for a whip antenna.Enclosed the circuit,a picture of the filter shape follows. B-3 dB : 3 KHz B-60dB : 28 KHz No more IM problems on any receiver I use.To compensate for the gain on the 50 Ohm input I use the 20 dB attentuator on the IC761. 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