Return-Path: Received: (qmail 21820 invoked from network); 11 Jan 2005 14:31:22 -0000 Received: from unknown (HELO ptb-spamcore02.plus.net) (192.168.71.3) by ptb-mailstore02.plus.net with SMTP; 11 Jan 2005 14:31:22 -0000 Received: from mailnull by ptb-spamcore02.plus.net with spamcore-l-b (Exim 4.32; FreeBSD) id 1CoN2z-000Okm-NF for dave@picks.force9.co.uk; Tue, 11 Jan 2005 14:31:05 +0000 Received: from [192.168.67.1] (helo=ptb-mxcore01.plus.net) by ptb-spamcore02.plus.net with esmtp (Exim 4.32; FreeBSD) id 1CoN2w-000Ojs-9h for dave@picks.force9.co.uk; Tue, 11 Jan 2005 14:30:58 +0000 Received: from post.thorcom.com ([193.82.116.20]) by ptb-mxcore01.plus.net with esmtp (Exim 4.30; FreeBSD) id 1CoN3C-0003EX-E8 for dave@picks.force9.co.uk; Tue, 11 Jan 2005 14:31:14 +0000 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1CoN2f-0003Rt-Sy for rs_out_1@blacksheep.org; Tue, 11 Jan 2005 14:30:41 +0000 Received: from [193.82.116.30] (helo=relay.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1CoN2f-0003Rk-Hr for rsgb_lf_group@blacksheep.org; Tue, 11 Jan 2005 14:30:41 +0000 Received: from virus-out-st.online.no ([193.212.240.200] helo=scan.telenor.net) by relay.thorcom.net with esmtp (Exim 4.43) id 1CoN2d-0001R0-2K for rsgb_lf_group@blacksheep.org; Tue, 11 Jan 2005 14:30:41 +0000 Received: from tns-fbu-22-208.corp.telenor.no ([134.47.162.90] [134.47.162.90]) by scan.telenor.net with ESMTP for rsgb_lf_group@blacksheep.org; Tue, 11 Jan 2005 15:30:22 +0100 Received: from tns-fbu-22-212.corp.telenor.no ([134.47.162.91]) by tns-fbu-22-208.corp.telenor.no with Microsoft SMTPSVC(5.0.2195.6713); Tue, 11 Jan 2005 15:30:22 +0100 Received: from TNS-FBU-2E-014.corp.telenor.no ([134.47.163.124]) by tns-fbu-22-212.corp.telenor.no with Microsoft SMTPSVC(5.0.2195.6713); Tue, 11 Jan 2005 15:30:21 +0100 X-MimeOLE: Produced By Microsoft Exchange V6.5.7226.0 Content-class: urn:content-classes:message Date: Tue, 11 Jan 2005 15:30:21 +0100 Message-Id: Thread-Topic: LF: Re: semiconductor switches, was "Pre-amps on LF" thread-index: AcT36WVqyisEaG5BSx2QzOcrPjIcSgAAELKQ From: jan-martin.noding@telenor.com To: rsgb_lf_group@blacksheep.org X-OriginalArrivalTime: 11 Jan 2005 14:30:21.0897 (UTC) FILETIME=[14F11B90:01C4F7EA] MIME-Version: 1.0 X-SPF-Result: relay.thorcom.net: 193.212.240.200 is neither permitted nor denied by domain of telenor.com X-Spam-Score: 0.2 (/) X-Spam-Report: autolearn=no,FORGED_RCVD_HELO=0.05,NO_REAL_NAME=0.178 Subject: LF: Re: Re: semiconductor switches, was "Pre-amps on LF" Content-Type: text/plain; charset=iso-8859-1; format=flowed Content-Transfer-Encoding: 8bit X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com 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-Spam-Filtered: by PlusNet SpamCORE (v3.00) Not sure if IF-break-through could be a problem - as it is at least on the 28MHz band - so might be an idea to use lower frequency band, possibly around 2MHz (?), so I might even consider my well reputed KwEa receiver 73, Jan-Martin, LA8AK -----Opprinnelig melding----- Fra: owner-rsgb_lf_group@blacksheep.org >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