Return-Path: Received: (qmail 9778 invoked from network); 24 Jan 2003 10:44:09 -0000 Received: from netmail02.services.quay.plus.net (212.159.14.221) by mailstore with SMTP; 24 Jan 2003 10:44:09 -0000 Received: (qmail 16829 invoked by uid 10001); 24 Jan 2003 10:44:09 -0000 X-Priority: 3 X-MSMail-Priority: Normal Received: from post.thorcom.com (193.82.116.70) by netmail02.services.quay.plus.net with SMTP; 24 Jan 2003 10:44:08 -0000 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1106 X-SQ: A Received: from majordom by post.thorcom.com with local (Exim 4.12) id 18c1F3-00073x-00 for rsgb_lf_group-outgoing@blacksheep.org; Fri, 24 Jan 2003 10:39:21 +0000 Received: from [194.25.108.14] (helo=server06.mvnet.de ident=root) by post.thorcom.com with esmtp (Exim 4.12) id 18c1F3-00073m-00 for rsgb_lf_group@blacksheep.org; Fri, 24 Jan 2003 10:39:21 +0000 Received: from gtwf.mvnet.de (gtwf.mvnet.de [194.25.108.83]) by server06.mvnet.de (8.12.5/8.12.5) with ESMTP id h0OAdWHG025345 for ; Fri, 24 Jan 2003 11:39:32 +0100 Received: from falkenuge02.mvnet.de (gtwf-mgw.mvnet.de [192.168.0.3]) by gtwf.mvnet.de (8.12.6/) with SMTP id h0OAeCBp032646 for ; Fri, 24 Jan 2003 11:40:12 +0100 Received: from no.name.available by falkenuge02.mvnet.de via smtpd (for [192.168.0.10]) with SMTP; 24 Jan 2003 10:39:15 UT Received: from prox ([10.10.0.3]) by mgwl01.mgw.mvnet.de (8.12.5/8.12.5) with SMTP id h0OAcleR019164 for ; Fri, 24 Jan 2003 11:38:54 +0100 Received: from 10.254.1.1 by prox (InterScan E-Mail VirusWall NT); Fri, 24 Jan 2003 11:53:24 +0100 Received: from [194.1.2.8] by adlerauge-11.mvnet.de via smtpd (for [10.254.1.10]) with SMTP; 24 Jan 2003 10:35:47 UT Received: by UMNT02 with Internet Mail Service (5.5.2650.21) id ; Fri, 24 Jan 2003 11:37:11 +0100 Message-ID: From: v.wedelstaedt@um.mv-regierung.de To: rsgb_lf_group@blacksheep.org Date: Fri, 24 Jan 2003 11:37:11 +0100 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2650.21) Subject: LF: AW: VFO for VLF receiver? Digital type pre-mixer, any ideas? Content-Type: text/plain; charset=iso-8859-1; format=flowed Content-Transfer-Encoding: 8bit X-Spam-Status: No, hits=4.0 required=6.0tests=EXCHANGE_SERVER,FORGED_RCVD_TRAIL,NO_REAL_NAME, SPAM_PHRASE_00_01version=2.43 X-Spam-Level: **** X-SA-Exim-Scanned: Yes Sender: Precedence: bulk Reply-To: rsgb_lf_group@blacksheep.org X-Listname: rsgb_lf_group X-SA-Exim-Rcpt-To: rsgb_lf_group-outgoing@blacksheep.org X-SA-Exim-Scanned: No; SAEximRunCond expanded to false Hi yes, any ideas, please look at www.mvnet.de/priv/vw/index~1.htm I will write any schematics and programs thes evening and on the weekend 01.Feb to the homepage 73 Eberhard -----Ursprüngliche Nachricht----- Von: jan-martin.noding@telenor.com [mailto:jan-martin.noding@telenor.com] Gesendet: Mittwoch, 22. Januar 2003 18:03 An: rsgb_lf_group@blacksheep.org Betreff: LF: VFO for VLF receiver? Digital type pre-mixer, any ideas? Hi planning to build a VFO for a boatanchor VLF receiver covering 50-140KHz, first IF is 169kHz and it was originally using xtal control. The VFO must cover 220-310kHz. The variation needs to 85kHz, and it seems easier to make a VFO above 1MHz, possibly Clapp oscillator (my favourite since everybody else disregard it!), might also try the Seiler. I thought of using a 2457.6MHz xtal and mix with VFO (ca 2MHz), and divide the output by two or more. Suppose I could use an FF, preferably CD4013 for the mixer. But I can't find any reference to similar constructions, only have a vague memory that it has been mentioned in TT some time in the last 35 years Wonder if somebody else have some experience in this, and will the mixer divide or just mix? 960kHz resonators are also readily available, but they won't pull much. 73 Jan-Martin --- J M Nøding, Datakvalitet, TTS, Kristiansand Telefon 0047-380-52660, 9077-7126 (QTH: 0047-380-87178)