Return-Path: Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by mtain-db05.r1000.mx.aol.com (Internet Inbound) with ESMTP id DA8FB380000AB; Thu, 5 Jul 2012 13:00:27 -0400 (EDT) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1SmpOr-0000HW-0D for rs_out_1@blacksheep.org; Thu, 05 Jul 2012 17:59:29 +0100 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1SmpOq-0000HN-Fq for rsgb_lf_group@blacksheep.org; Thu, 05 Jul 2012 17:59:28 +0100 Received: from smtp08.online.nl ([194.134.42.53]) by relay1.thorcom.net with esmtp (Exim 4.77) (envelope-from ) id 1SmpOo-0007Ui-Sc for rsgb_lf_group@blacksheep.org; Thu, 05 Jul 2012 17:59:27 +0100 Received: from smtp08.online.nl (localhost [127.0.0.1]) by smtp08.online.nl (Postfix) with ESMTP id DB6C766496 for ; Thu, 5 Jul 2012 18:59:25 +0200 (CEST) Received: from victor0a1c960e (s529d275f.adsl.wanadoo.nl [82.157.39.95]) by smtp08.online.nl (Postfix) with SMTP for ; Thu, 5 Jul 2012 18:59:25 +0200 (CEST) From: To: Date: Thu, 5 Jul 2012 19:00:52 +0200 Message-ID: MIME-Version: 1.0 X-Priority: 3 (Normal) X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook IMO, Build 9.0.2416 (9.0.2910.0) In-Reply-To: <4FF5C181.9070302@iup.uni-heidelberg.de> Importance: Normal X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.3138 X-Antivirus: avast! (VPS 120705-0, 05-07-2012), Outbound message X-Antivirus-Status: Clean X-Online-Scanned: by Cloudmark authority (on smtp08.online.nl) X-Spam-Score: -0.7 (/) X-Spam-Report: Spam detection software, running on the system "relay1.thorcom.net", has identified this incoming email as possible spam. The original message has been attached to this so you can view it (if it isn't spam) or label similar future email. If you have any questions, see the administrator of that system for details. Content preview: Hello Stefan, for narrowband vfo i get best results with a clap or a seiler,both with big parallel c over the FET.But of course everything depends on the mechanical stability and the quality of the parts: ceramic coilformer,silvered mica capacitors and tempcompensation with N750 ceramic capacitors.With trial and error you may get very good results.Use big parts,temprise will be less,so stability will be better.. [...] Content analysis details: (-0.7 points, 5.0 required) pts rule name description ---- ---------------------- -------------------------------------------------- -0.7 RCVD_IN_DNSWL_LOW RBL: Sender listed at http://www.dnswl.org/, low trust [194.134.42.53 listed in list.dnswl.org] -0.0 T_RP_MATCHES_RCVD Envelope sender domain matches handover relay domain X-Scan-Signature: 5f132ffce194fb93f2267a462d849f2b Subject: LF: RE: Analog oscillators Content-Type: text/plain; charset="ISO-8859-15" Content-Transfer-Encoding: quoted-printable X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: * X-Spam-Status: No, hits=1.2 required=5.0 tests=FROM_ENDS_IN_NUMS,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-SCOLL-SCORE: 0:2:341468640:93952408 X-AOL-SCOLL-URL_COUNT: 0 x-aol-sid: 3039ac1d40594ff5c82b29c8 X-AOL-IP: 195.171.43.25 X-AOL-SPF: domain : blacksheep.org SPF : none Hello Stefan, for narrowband vfo i get best results with a clap or a seiler,both with b= ig parallel c over the FET.But of course everything depends on the mechanica= l stability and the quality of the parts: ceramic coilformer,silvered mica capacitors and tempcompensation with N750 ceramic capacitors.With trial a= nd error you may get very good results.Use big parts,temprise will be less,s= o stability will be better.. GL 73 Victor -----Oorspronkelijk bericht----- Van: owner-rsgb_lf_group@blacksheep.org [mailto:owner-rsgb_lf_group@blacksheep.org]Namens Stefan Sch=E4fer Verzonden: donderdag 5 juli 2012 18:32 Aan: rsgb_lf_group@blacksheep.org Onderwerp: LF: Analog oscillators LF/MF, I want to build an analog oscillator running on 1888....1916 kHz. It will be used as the input VFO for my PA which divides the frequency by 4 internally. A metallic box with 12V input voltage cables and a RG174 cable for the output is already available. Also a 78L05 with its 100nF Cs is mounted. Later i can label the scale directly with 472...479 kHz, so the need to divde by 4 in my head will not be necessary any more. The output voltage should be arround 12V. The curve form is not critical, it does not need to be a clear sine wave. However the frequency should be as stable as possible. So, what is the best oscillator circuit? Are there strong differences regarding stability or is it always a question of the temperature? Ah, it must be a LC oscillator. The adjusting part is a variable C of 33pF with a 6mm axis. There are a lot of circuits in the web but maybe one principe is to be preferred.. 73, Stefan/DK7FC