Return-Path: Received: from rly-de12.mx.aol.com (rly-de12.mail.aol.com [172.19.170.148]) by air-de07.mail.aol.com (v121_r5.5) with ESMTP id MAILINDE072-51f497273cf301; Sat, 17 Jan 2009 19:12:14 -0500 Received: from post.thorcom.com (post.thorcom.com [193.82.116.20]) by rly-de12.mx.aol.com (v121_r4.4) with ESMTP id MAILRELAYINDE126-51f497273cf301; Sat, 17 Jan 2009 19:12:01 -0500 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1LOLGW-0008AT-93 for rs_out_1@blacksheep.org; Sun, 18 Jan 2009 00:11:48 +0000 Received: from [193.82.116.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1LOLGV-0008AK-U2 for rsgb_lf_group@blacksheep.org; Sun, 18 Jan 2009 00:11:47 +0000 Received: from mout2.freenet.de ([195.4.92.92]) by relay1.thorcom.net with esmtp (Exim 4.63) (envelope-from ) id 1LOLGU-0001q9-Ny for rsgb_lf_group@blacksheep.org; Sun, 18 Jan 2009 00:11:47 +0000 Received: from [195.4.92.21] (helo=11.mx.freenet.de) by mout2.freenet.de with esmtpa (ID dl4yhf@freenet.de) (port 25) (Exim 4.69 #76) id 1LOLGU-00022g-0M for rsgb_lf_group@blacksheep.org; Sun, 18 Jan 2009 01:11:46 +0100 Received: from e177036155.adsl.alicedsl.de ([85.177.36.155]:3890 helo=[192.168.0.101]) by 11.mx.freenet.de with esmtpa (ID dl4yhf@freenet.de) (port 25) (Exim 4.69 #76) id 1LOLGT-0005iY-RI for rsgb_lf_group@blacksheep.org; Sun, 18 Jan 2009 01:11:45 +0100 Message-ID: <497273C0.4060808@freenet.de> Date: Sun, 18 Jan 2009 01:11:44 +0100 From: =?ISO-8859-1?Q?Wolfgang_B=FCscher?= User-Agent: Thunderbird 2.0.0.19 (Windows/20081209) MIME-Version: 1.0 To: rsgb_lf_group@blacksheep.org References: In-Reply-To: X-Karma: unknown: X-Spam-Score: 0.0 (/) X-Spam-Report: autolearn=disabled,none Subject: Re: LF: Direct LF Upconverter Content-Type: text/plain; charset=ISO-8859-1; 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-IP: 193.82.116.20 X-Mailer: Unknown (No Version) Hello Andy, If you want to see a REALLY ugly LF exciter, also with I/Q processing : http://freenet-homepage.de/dl4yhf/phasing_lf_exciter/index.html And, not as ugly as mine: http://www.w1tag.com/Phasing.htm John has achieved a carrier suppresion around 60 dB, or better. A few notes about the software to drive it is also on this site. Cheers, Wolf DL4YHF . Andy Talbot schrieb: > 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 > > > >