Return-Path: X-Spam-DCC: paranoid 1290; Body=2 Fuz1=2 Fuz2=2 X-Spam-Checker-Version: SpamAssassin 3.1.3 (2006-06-01) on lipkowski.org X-Spam-Level: X-Spam-Status: No, score=-0.5 required=5.0 tests=BAYES_00,DNS_FROM_AHBL_RHSBL, FORGED_RCVD_HELO,RATWARE_GECKO_BUILD autolearn=no version=3.1.3 Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by paranoid.lipkowski.org (8.13.7/8.13.7) with ESMTP id u11KH8E1001663 for ; Mon, 1 Feb 2016 21:17:08 +0100 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1aQKoG-0001zm-6Q for rs_out_1@blacksheep.org; Mon, 01 Feb 2016 20:10:52 +0000 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1aQKoF-0001zb-U7 for rsgb_lf_group@blacksheep.org; Mon, 01 Feb 2016 20:10:51 +0000 Received: from brian.netcom.co.uk ([217.72.171.64]) by relay1.thorcom.net with esmtp (Exim 4.86) (envelope-from ) id 1aQKnB-0005mN-P3 for rsgb_lf_group@blacksheep.org; Mon, 01 Feb 2016 20:10:50 +0000 Received: from sb.abelian.org (i-194-106-52-83.freedom2surf.net [194.106.52.83]) by brian.netcom.co.uk (Postfix) with ESMTP id F2B8E320078 for ; Mon, 1 Feb 2016 19:48:16 +0000 (GMT) Received: from [127.0.0.1] (localhost [127.0.0.1]) by sb.abelian.org (Postfix) with ESMTP id 71BCD28A0220 for ; Mon, 1 Feb 2016 20:09:29 +0000 (UTC) Message-ID: <56AFBB79.1050108@abelian.org> Date: Mon, 01 Feb 2016 20:09:29 +0000 From: Paul Nicholson User-Agent: Mozilla/5.0 (X11; Linux i686; rv:17.0) Gecko/20130106 Thunderbird/17.0.2 MIME-Version: 1.0 To: rsgb_lf_group@blacksheep.org References: <56AE72BE.9080308@abelian.org> In-Reply-To: <56AE72BE.9080308@abelian.org> X-Scan-Signature: 4ead635eadbaebfaa92cfec77deb715d Subject: Re: LF: Linux DDS program Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit 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-Scanned-By: MIMEDefang 2.56 on 10.1.3.10 Status: RO X-Status: X-Keywords: X-UID: 6609 > http://abelian.org/ebnaut/ebsynth.shtml I squared up the soundcard output with a Schmitt trigger and the 3rd harmonic of 45.9 kHz comes out very nicely at 137.7 kHz. Also the 7th harmonic of 68142.857143 Hz gives a nice pure note at 477 kHz on my scanner. Right now I'm listening to the 53rd harmonic on 80m and it still sounds quite clean. EbNaut sounds very chirpy when listening to a harmonic as the phase rapidly slews from one symbol to the opposite one. The 7th harmonic is going through 3.5 cycles each time. I'll have to add another command line option to specify the phase change so that a selected harmonic will have the right 180 degree shift. -- Paul Nicholson --