Return-Path: Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by mtain-mk03.r1000.mx.aol.com (Internet Inbound) with ESMTP id A8AC1380000B2; Thu, 5 Jul 2012 12:34:52 -0400 (EDT) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1Smp0I-00007Z-7r for rs_out_1@blacksheep.org; Thu, 05 Jul 2012 17:34:06 +0100 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1Smp0H-00007P-RJ for rsgb_lf_group@blacksheep.org; Thu, 05 Jul 2012 17:34:05 +0100 Received: from relay2.uni-heidelberg.de ([129.206.210.211]) by relay1.thorcom.net with esmtps (TLSv1:AES256-SHA:256) (Exim 4.77) (envelope-from ) id 1Smp0G-0007ON-3s for rsgb_lf_group@blacksheep.org; Thu, 05 Jul 2012 17:34:04 +0100 Received: from freitag.iup.uni-heidelberg.de (freitag.iup.uni-heidelberg.de [129.206.29.204]) by relay2.uni-heidelberg.de (8.13.8/8.13.8) with ESMTP id q65GY21K002255 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=NO) for ; Thu, 5 Jul 2012 18:34:03 +0200 Received: from [129.206.22.206] (pc206.iup.uni-heidelberg.de [129.206.22.206]) by freitag.iup.uni-heidelberg.de (8.12.11.20060308/8.11.2) with ESMTP id q65GY2AJ023138 for ; Thu, 5 Jul 2012 18:34:02 +0200 Message-ID: <4FF5C181.9070302@iup.uni-heidelberg.de> Date: Thu, 05 Jul 2012 18:32:01 +0200 From: =?ISO-8859-15?Q?Stefan_Sch=E4fer?= User-Agent: Mozilla/5.0 (Windows; U; Windows NT 6.1; de; rv:1.9.1.8) Gecko/20100227 Thunderbird/3.0.3 MIME-Version: 1.0 To: rsgb_lf_group@blacksheep.org X-Spam-Score: -2.3 (--) 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: 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. [...] Content analysis details: (-2.3 points, 5.0 required) pts rule name description ---- ---------------------- -------------------------------------------------- -2.3 RCVD_IN_DNSWL_MED RBL: Sender listed at http://www.dnswl.org/, medium trust [129.206.210.211 listed in list.dnswl.org] -0.0 T_RP_MATCHES_RCVD Envelope sender domain matches handover relay domain X-Scan-Signature: bb61bee384896e075004ae5ec954ddd2 Subject: LF: Analog oscillators Content-Type: text/plain; charset=ISO-8859-15; format=flowed Content-Transfer-Encoding: 7bit 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 x-aol-global-disposition: G X-AOL-SCOLL-SCORE: 0:2:414623232:93952408 X-AOL-SCOLL-URL_COUNT: 0 x-aol-sid: 3039ac1d61874ff5c22b092a X-AOL-IP: 195.171.43.25 X-AOL-SPF: domain : blacksheep.org SPF : none 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