Return-Path: Received: (qmail 42113 invoked from network); 16 Jan 2005 20:36:40 -0000 Received: from unknown (HELO ptb-spamcore02.plus.net) (192.168.71.3) by ptb-mailstore02.plus.net with SMTP; 16 Jan 2005 20:36:40 -0000 Received: from mailnull by ptb-spamcore02.plus.net with spamcore-l-b (Exim 4.32; FreeBSD) id 1CqH4m-000O8j-M4 for dave@picks.force9.co.uk; Sun, 16 Jan 2005 20:32:45 +0000 Received: from [192.168.67.2] (helo=ptb-mxcore02.plus.net) by ptb-spamcore02.plus.net with esmtp (Exim 4.32; FreeBSD) id 1CqH4m-000O8a-90 for dave@picks.force9.co.uk; Sun, 16 Jan 2005 20:32:44 +0000 Received: from post.thorcom.com ([193.82.116.20]) by ptb-mxcore02.plus.net with esmtp (Exim) id 1CqH8Y-0003SL-2E for dave@picks.force9.co.uk; Sun, 16 Jan 2005 20:36:38 +0000 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1CqH7P-0005fE-Hs for rs_out_1@blacksheep.org; Sun, 16 Jan 2005 20:35:27 +0000 Received: from [193.82.116.30] (helo=relay.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1CqH7P-0005f5-2t for rsgb_lf_group@blacksheep.org; Sun, 16 Jan 2005 20:35:27 +0000 Received: from smtpout01-04.mesa1.secureserver.net ([64.202.165.79]) by relay.thorcom.net with smtp (Exim 4.43) id 1CqH7K-0004yC-AV for rsgb_lf_group@blacksheep.org; Sun, 16 Jan 2005 20:35:27 +0000 Received: (qmail 16352 invoked from network); 16 Jan 2005 20:35:06 -0000 Received: from unknown (68.116.172.18) by smtpout01-04.mesa1.secureserver.net (64.202.165.79) with ESMTP; 16 Jan 2005 20:35:06 -0000 Message-ID: <005801c4fc0a$c5526380$0500a8c0@charter.net> From: "John Andrews" To: lowfer@lwca.org, rsgb_lf_group@blacksheep.org Date: Sun, 16 Jan 2005 20:34:24 -0000 MIME-Version: 1.0 X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2800.1409 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1409 X-SPF-Result: relay.thorcom.net: 64.202.165.79 is neither permitted nor denied by domain of w1tag.com X-Spam-Score: 0.0 (/) X-Spam-Report: autolearn=failed,none Subject: LF: Image-Cancelling Exciter Content-Type: text/plain; charset=iso-8859-1; format=flowed Content-Transfer-Encoding: 8bit X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com 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-Spam-Filtered: by PlusNet SpamCORE (v3.00) I've been tinkering with a phasing exciter that uses easy-to-get parts and produces a very clean signal from the sound card quadrature outputs in Jason and SpecLab. A preliminary schematic (hand-drawn, DL4YHF quality ) is at: http://www.w1tag.com/files/Exciter.jpg The "left" and "right" inputs from the sound card are at the upper left. A 4X L.O. input is at the lower left. The output on the right is +8 dBm for a 1.5 volt p-p audio input. Power is 12 VDC, not critical, but stay above 11 VDC. Present specs at +9 dBm output are: Carrier: > 65 dB suppression LSB: > 52 dB suppression All other: > 50 dB below the carrier. I'll get this drawn and written up later in the week. Questions about my sanity are welcome. Credit is due VK3BHR for several ideas in the article posted at: http://ironbark.bendigo.latrobe.edu.au/~rice/ssb/ssb.html John Andrews, W1TAG/WD2XES