Return-Path: Received: from mtain-me03.r1000.mx.aol.com (mtain-me03.r1000.mx.aol.com [172.29.96.139]) by air-ma07.mail.aol.com (v129.4) with ESMTP id MAILINMA073-b52e4cd6ff6712d; Sun, 07 Nov 2010 14:35:03 -0500 Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by mtain-me03.r1000.mx.aol.com (Internet Inbound) with ESMTP id E63D23800004D; Sun, 7 Nov 2010 14:35:01 -0500 (EST) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1PFAzY-0007Vw-BZ for rs_out_1@blacksheep.org; Sun, 07 Nov 2010 19:33:28 +0000 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1PFAzX-0007Vn-Rw for rsgb_lf_group@blacksheep.org; Sun, 07 Nov 2010 19:33:27 +0000 Received: from smtp-out12.han.skanova.net ([195.67.226.212]) by relay1.thorcom.net with esmtp (Exim 4.63) (envelope-from ) id 1PFAzU-00072r-Te for rsgb_lf_group@blacksheep.org; Sun, 07 Nov 2010 19:33:27 +0000 Received: from [127.0.0.1] (81.235.167.68) by smtp-out12.han.skanova.net (8.5.124.10) (authenticated as u33233109) id 4C7E0D4901446C59 for rsgb_lf_group@blacksheep.org; Sun, 7 Nov 2010 20:33:18 +0100 Message-ID: <4CD6FF00.9090406@telia.com> Date: Sun, 07 Nov 2010 20:33:20 +0100 From: "Johan H. Bodin" User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; sv-SE; rv:1.9.2.12) Gecko/20101027 Thunderbird/3.1.6 MIME-Version: 1.0 To: rsgb_lf_group@blacksheep.org References: <000c01cb7da9$23b1a1e0$8d01a8c0@JAYDELL> In-Reply-To: X-Spam-Score: 1.4 (+) X-Spam-Report: autolearn=disabled,RATWARE_GECKO_BUILD=1.426 Subject: Re: LF: exciter for 137 and 500 kHz Content-Type: text/plain; charset=ISO-8859-1 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-sid: 3039ac1d608b4cd6ff651e20 X-AOL-IP: 195.171.43.25 X-AOL-SPF: domain : blacksheep.org SPF : none X-Mailer: Unknown (No Version) Andy, here's another nice program for all-pass I/Q filter design: http://www.tonnesoftware.com/quad.html 73 Johan SM6LKM ---- Andy Talbot wrote 2010-11-06 14:59: > Very Interesting. > Where did you find the design data for the allpass network? I've only been > able to find the values for up to 3+3 allpass stages. > > Mind you, at that number of chips a DSPic begins to look attractive. > > > Andy > www.g4jnt.com > > > On 6 November 2010 11:52, > > wrote: > > Nothing earth shattering ... another way to skin the cat. The 137 and 500 > kHz units have been in use for a few years ... just now getting around to > the write up. > > http://www.w1vd.com/137-500Phasingexciter.html > > Jay W1VD WD2XNS WE2XGR/2 > >