Return-Path: Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by mtain-da02.r1000.mx.aol.com (Internet Inbound) with ESMTP id A8EB5380000A4; Tue, 20 Mar 2012 18:06:13 -0400 (EDT) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1SA7AR-0006sg-Sl for rs_out_1@blacksheep.org; Tue, 20 Mar 2012 22:04:35 +0000 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1SA7AR-0006sX-AQ for rsgb_lf_group@blacksheep.org; Tue, 20 Mar 2012 22:04:35 +0000 Received: from relay.uni-heidelberg.de ([129.206.100.212]) by relay1.thorcom.net with esmtp (Exim 4.63) (envelope-from ) id 1SA7AQ-0006C4-D5 for rsgb_lf_group@blacksheep.org; Tue, 20 Mar 2012 22:04:35 +0000 Received: from freitag.iup.uni-heidelberg.de (freitag.iup.uni-heidelberg.de [129.206.29.204]) by relay.uni-heidelberg.de (8.14.1/8.14.1) with ESMTP id q2KM4X9Z030096 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=NO) for ; Tue, 20 Mar 2012 23:04:33 +0100 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 q2KM4Xo8024406 for ; Tue, 20 Mar 2012 23:04:33 +0100 Message-ID: <4F68FEDF.4030201@iup.uni-heidelberg.de> Date: Tue, 20 Mar 2012 23:04:15 +0100 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: 1.4 (+) X-Spam-Report: autolearn=disabled,RATWARE_GECKO_BUILD=1.426 Subject: LF: 137 kHz transmit IQ converter schematic 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: 0:2:469612448:93952408 X-AOL-SCOLL-URL_COUNT: 0 x-aol-sid: 3039ac1d404a4f68ff5415f4 X-AOL-IP: 195.171.43.25 X-AOL-SPF: domain : blacksheep.org SPF : none LF, I took the time to draw the circuit of my transmit IQ converter in the new program i have. This is the circuit i use to generate my transmit signal to drive the exciter of my PA. The 137 kHz signal is directly generated in this circuit. It is mixed with 125 kHz internally. The basic idea is taken from Andy/G4JNT, tnx agn. The circuit is however modified for an input frequency of 10.7...12.8 kHz which can be generated by the soundcard. The 125 kHz generator can be locked to a reference signal, into a PLL which isn't shown here (separate circuit). Anyway the circuit is a stand alone device. The input signal level may be 0 (=100%) down to -30 dB full scale of the soundcard without a change of the output signal (including a safety factor of > 10 dB). http://dl.dropbox.com/u/19882028/LF/schematics/TX%20IQ%20converter.png Comments welcome. 73, Stefan/DK7FC