Return-Path: Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by mtain-da01.r1000.mx.aol.com (Internet Inbound) with ESMTP id C076C38000099; Sat, 7 Jul 2012 17:15:08 -0400 (EDT) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1SncJg-0001o9-Q4 for rs_out_1@blacksheep.org; Sat, 07 Jul 2012 22:13:24 +0100 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1SncJg-0001o0-3d for rsgb_lf_group@blacksheep.org; Sat, 07 Jul 2012 22:13:24 +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 1SncJe-00012a-G3 for rsgb_lf_group@blacksheep.org; Sat, 07 Jul 2012 22:13:22 +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 q67LDLRp019035 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=NO) for ; Sat, 7 Jul 2012 23:13:21 +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 q67LDLt7029323 for ; Sat, 7 Jul 2012 23:13:21 +0200 Message-ID: <4FF8A5F5.5020200@iup.uni-heidelberg.de> Date: Sat, 07 Jul 2012 23:11:17 +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 References: <7E7DFBB4D102A04DB5ADC88D66628A4A0FAB99CC@ICTS-S-MBX5.luna.kuleuven.be> <1SmrFA-199XcW0@fwd21.t-online.de> <4FF5EB68.9040507@iup.uni-heidelberg.de> <4FF61402.6000703@iup.uni-heidelberg.de> <4FF6EE70.2040600@iup.uni-heidelberg.de> <804F85B8E2764C8C9D9007462F586A67@JimPC> In-Reply-To: <804F85B8E2764C8C9D9007462F586A67@JimPC> 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: Hello Jim, Am 07.07.2012 20:55, schrieb James Moritz: > When you replace the existing inductor with a high-Q one, you will > find that the loop gain of the circuit is increased due to the higher > Q, and you will be able to use a lower gain/reduced transistor bias > current. Give me some days. Soon i will report about the progress. A T50-6 os at my parents QTH where i will be in some days. [...] 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: 4e3b1488273adbbe9757d6bdd5adf219 Subject: Re: LF: RE: 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: 0:2:365258368:93952408 X-AOL-SCOLL-URL_COUNT: 0 x-aol-sid: 3039ac1d40494ff8a6dc71a5 X-AOL-IP: 195.171.43.25 X-AOL-SPF: domain : blacksheep.org SPF : none Hello Jim, Am 07.07.2012 20:55, schrieb James Moritz: > When you replace the existing inductor with a high-Q one, you will > find that the loop gain of the circuit is increased due to the higher > Q, and you will be able to use a lower gain/reduced transistor bias > current. Give me some days. Soon i will report about the progress. A T50-6 os at my parents QTH where i will be in some days. > > For CW enthusiasts, I am suprised more use is not made of simple LC > VFOs. A drift of +/- 100Hz during the time taken for a QSO is usually > not noticeable, Oh i would say 100 Hz is a bit hard but 20 Hz should be OK in my opinion. > and it is easy to achieve this in the LF/MF range. Also, the narrow > tuning range means an elaborate tuning mechanism with reduction > gearing is not needed - just a knob with a simple hand-marked scale is > adequate. EXACTLY!!!! 73, Stefan/DK7FC > It is much simpler than the schemes needed to obtain an LF/MF signal > by dividing/mixing down the output of an HF rig, etc. A VFO is also a > much better practical choice than a crystal oscillator, which leaves > you stuck on a fixed frequency. > > Cheers, Jim Moritz > 73 de M0BMU