Return-Path: Received: from rly-df12.mx.aol.com (rly-df12.mail.aol.com [172.19.156.25]) by air-df04.mail.aol.com (v121_r5.5) with ESMTP id MAILINDF042-599497270ec121; Sat, 17 Jan 2009 18:59:48 -0500 Received: from post.thorcom.com (post.thorcom.com [193.82.116.20]) by rly-df12.mx.aol.com (v121_r4.4) with ESMTP id MAILRELAYINDF128-599497270ec121; Sat, 17 Jan 2009 18:59:42 -0500 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1LOL4Q-0007wo-8S for rs_out_1@blacksheep.org; Sat, 17 Jan 2009 23:59:18 +0000 Received: from [193.82.116.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1LOL4P-0007wf-T3 for rsgb_lf_group@blacksheep.org; Sat, 17 Jan 2009 23:59:17 +0000 Received: from mail-bw0-f19.google.com ([209.85.218.19]) by relay1.thorcom.net with esmtp (Exim 4.63) (envelope-from ) id 1LOL4P-0001ik-5Q for rsgb_lf_group@blacksheep.org; Sat, 17 Jan 2009 23:59:17 +0000 Received: by bwz12 with SMTP id 12so6527076bwz.4 for ; Sat, 17 Jan 2009 15:59:10 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=googlemail.com; s=gamma; h=domainkey-signature:received:received:message-id:date:from:to :subject:mime-version:content-type:content-transfer-encoding :content-disposition; bh=MgE/+IhM8D5j+17fvfiJblS/AFuqXeqJbamkMuXu/po=; b=rcbdWZySxkgLVqwY2E4yuvXTvQM/pcOU7v9dVQiyz8u7NzyLPAlens0QutEVpWA/A1 m2XtOsJu8m0+mn3CXlqho12OtGGKexbV9yTcS7xO4LFYWXB86lo8c4zZSjYWC4uO0Gx6 n/+v0DEKPjbYuuQGitJUDxKlWdK1ciOkPAWtU= DomainKey-Signature: a=rsa-sha1; c=nofws; d=googlemail.com; s=gamma; h=message-id:date:from:to:subject:mime-version:content-type :content-transfer-encoding:content-disposition; b=kU5MPutgFjgbp1CjgNEzCf76EqSUHM9x5DOmPZvKGYq89x8/jOYWA/85/TTxvlKgF8 VFKegolso4YYrcSV1B5xtIl8B9Mx7qhLwPjNRuGORo8wAYKgjvYRA5JIhsbXwola3bu5 L2g0wvBVXg/ebYEMiv6OLy+uzKP11qGs3CKFA= Received: by 10.181.150.16 with SMTP id c16mr1433275bko.150.1232236750388; Sat, 17 Jan 2009 15:59:10 -0800 (PST) Received: by 10.180.228.10 with HTTP; Sat, 17 Jan 2009 15:59:10 -0800 (PST) Message-ID: Date: Sat, 17 Jan 2009 23:59:10 +0000 From: "Andy Talbot" To: rsgb_lf_group@blacksheep.org MIME-Version: 1.0 Content-Disposition: inline X-Karma: unknown: DomainKey-Status: good (testing) X-Spam-Score: 0.0 (/) X-Spam-Report: autolearn=disabled,none Subject: LF: Direct LF Upconverter 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-IP: 193.82.116.20 X-AOL-SCOLL-AUTHENTICATION: mail_rly_antispam_dkim-m262.2 ; domain : googlemail.com DKIM : fail X-Mailer: Unknown (No Version) Direct soundcard to LF upconverter; image reject mixer with allpass phase network for a few hundred Hz bandwidth. http://www.g4jnt.com/LFUpconv.pdf Around 40dBc sideband rejection, so a bit marginal for the perfectionist but probably difficult to do very much better without an awful lot of phase and amplitude tweaking. Andy G4JNT www.g4jnt.com