Return-Path: Received: (qmail 21135 invoked from network); 11 Jan 2005 14:24:05 -0000 Received: from unknown (HELO ptb-spamcore02.plus.net) (192.168.71.3) by ptb-mailstore01.plus.net with SMTP; 11 Jan 2005 14:24:05 -0000 Received: from mailnull by ptb-spamcore02.plus.net with spamcore-l-b (Exim 4.32; FreeBSD) id 1CoMvy-000M2Y-G0 for dave@picks.force9.co.uk; Tue, 11 Jan 2005 14:23:49 +0000 Received: from [192.168.67.3] (helo=ptb-mxcore03.plus.net) by ptb-spamcore02.plus.net with esmtp (Exim 4.32; FreeBSD) id 1CoMvy-000M2V-8B for dave@picks.force9.co.uk; Tue, 11 Jan 2005 14:23:46 +0000 Received: from post.thorcom.com ([193.82.116.20]) by ptb-mxcore03.plus.net with esmtp (Exim) id 1CoMwE-0002JU-7X for dave@picks.force9.co.uk; Tue, 11 Jan 2005 14:24:02 +0000 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1CoMvD-0003N6-RC for rs_out_1@blacksheep.org; Tue, 11 Jan 2005 14:22:59 +0000 Received: from [193.82.116.30] (helo=relay.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1CoMvD-0003Mx-GI for rsgb_lf_group@blacksheep.org; Tue, 11 Jan 2005 14:22:59 +0000 Received: from nibbel.kulnet.kuleuven.ac.be ([134.58.240.41]) by relay.thorcom.net with esmtp (Exim 4.43) id 1CoMvB-0001Of-5K for rsgb_lf_group@blacksheep.org; Tue, 11 Jan 2005 14:22:59 +0000 Received: from localhost (localhost [127.0.0.1]) by nibbel.kulnet.kuleuven.ac.be (Postfix) with ESMTP id BCD064BA9B for ; Tue, 11 Jan 2005 15:22:44 +0100 (CET) Received: from antonius.kulnet.kuleuven.ac.be (antonius.kulnet.kuleuven.ac.be [134.58.240.73]) by nibbel.kulnet.kuleuven.ac.be (Postfix) with ESMTP id 62EB54BAAD for ; Tue, 11 Jan 2005 15:22:44 +0100 (CET) Received: from dell-rik.fys.kuleuven.ac.be (pc-10-33-165-177.fys.kuleuven.ac.be [10.33.165.177]) by antonius.kulnet.kuleuven.ac.be (Postfix) with ESMTP id 3713D4C2C5 for ; Tue, 11 Jan 2005 15:22:44 +0100 (CET) Message-Id: <5.1.0.14.0.20050111152937.02ba1eb8@u0019445.kuleuven.be> X-Sender: u0019445@u0019445.kuleuven.be X-Mailer: QUALCOMM Windows Eudora Version 5.1 Date: Tue, 11 Jan 2005 15:34:16 +0100 To: rsgb_lf_group@blacksheep.org From: Rik Strobbe In-Reply-To: Mime-Version: 1.0 X-Virus-Scanned: by KULeuven Antivirus Cluster X-SPF-Result: relay.thorcom.net: 134.58.240.41 is neither permitted nor denied by domain of fys.kuleuven.ac.be X-Spam-Score: 0.0 (/) X-Spam-Report: autolearn=failed,none Subject: Re: LF: Re: semiconductor switches, was "Pre-amps on LF" Content-Type: text/plain; charset=us-ascii; format=flowed X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com 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 X-Spam-Filtered: by PlusNet SpamCORE (v3.00) Content-transfer-encoding: 8bit >It is now starting to look easier to start from scratch by building >a new LF RX or simply to continue using the external preamp. > >73 >Joe VO1NA Hello Joe, maybe is less work to build an up-convertor to HF and use the existing RX at HF. Using a widely available (and thus cheap) 10MHz xtal you end up right in the 30m band (10.137kHz). As the RX is probably very sensitive at 10MHz maybe you can do without any amplification at LF, just a bandpass filter and a mixer (preferably passive DBM, minicircuits has some nice and cheap building blocks). 73, Rik ON7YD