Return-Path: Received: from mtain-dg05.r1000.mx.aol.com (mtain-dg05.r1000.mx.aol.com [172.29.65.13]) by air-mc05.mail.aol.com (v129.4) with ESMTP id MAILINMC053-a9694d4d9df88; Sat, 05 Feb 2011 13:59:04 -0500 Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by mtain-dg05.r1000.mx.aol.com (Internet Inbound) with ESMTP id 6A83A38000092; Sat, 5 Feb 2011 13:59:03 -0500 (EST) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1PlnKL-0002ls-EY for rs_out_1@blacksheep.org; Sat, 05 Feb 2011 18:57:45 +0000 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1PlnKK-0002lj-SG for rsgb_lf_group@blacksheep.org; Sat, 05 Feb 2011 18:57:44 +0000 Received: from mail-iy0-f171.google.com ([209.85.210.171]) by relay1.thorcom.net with esmtp (Exim 4.63) (envelope-from ) id 1PlnKI-0001yF-DW for rsgb_lf_group@blacksheep.org; Sat, 05 Feb 2011 18:57:44 +0000 Received: by iyh42 with SMTP id 42so233525iyh.16 for ; Sat, 05 Feb 2011 10:57:35 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=domainkey-signature:mime-version:date:message-id:subject:from:to :content-type; bh=PoOasjbobB88ChmoMKFpahLfQj33kYwZtxaT9lr1cw8=; b=CP9wL4zin2OeT73tY00nmAz99+t3qb+7k4zOxtP4tD04lPtr5QgtW04Bp19CVCV2Nt KoylA3zIEOuWomsvBmhQQXLTVoJAOZuowWfCY1dfqTg++KMVJzh+UF4KCW9LS58QRd+s tppU6NAmhW9pmqXSCLedESX/t7nofocHysXeQ= DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=mime-version:date:message-id:subject:from:to:content-type; b=Wes6jAtUjxhux9LIsjN1hxx9XKFzlvZLOgAfL+juhA6PrSVfZt4vQF0wsThJLzF7aG J+aMxXxhJIPdwlKLOcuVw9l4pnBC2c4Q53CPbGVFYaXgfvJkoCN4N0jxUyifUJEdxnzI H8PFkf6vFrG48EPLH6qeL719baQuKqZshIuIw= MIME-Version: 1.0 Received: by 10.231.199.212 with SMTP id et20mr3976822ibb.22.1296932254206; Sat, 05 Feb 2011 10:57:34 -0800 (PST) Received: by 10.231.199.4 with HTTP; Sat, 5 Feb 2011 10:57:34 -0800 (PST) Date: Sat, 5 Feb 2011 18:57:34 +0000 Message-ID: From: Andy Talbot To: rsgb_lf_group@blacksheep.org, sub9khz@yahoogroups.com DomainKey-Status: good (testing) X-Spam-Score: 0.0 (/) X-Spam-Report: autolearn=disabled,HTML_MESSAGE=0.001 Subject: LF: Simple PIC based DDS for VLF Content-Type: multipart/alternative; boundary=90e6ba53aa664f4b17049b8d9238 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=HTML_MESSAGE 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-SCOLL-AUTHENTICATION: mail_rly_antispam_dkim-d003.2 ; domain : gmail.com DKIM : fail x-aol-sid: 3039ac1d410d4d4d9df61277 X-AOL-IP: 195.171.43.25 X-AOL-SPF: domain : blacksheep.org SPF : none X-Mailer: Unknown (No Version) --90e6ba53aa664f4b17049b8d9238 Content-Type: text/plain; charset=ISO-8859-1 9kHz OPs may be interested in this DDS suitable for audio/ VLF using just a 16F628 PIC, , R-2R ladder and op-amp filter. It can generate frequencies up to about 40kHz with typical DDS high resolution / frequency steps, (higher if you overclock the device) offers two-tone FSK operation by toggling a single input line (ideal for DFCW), The two frequencies are stored in non-volatile memory and are user-programmable from an RS232 interface using ASCII text based commands. See www.g4jnt.com/PIC_DDS.zip for full details. Andy www.g4jnt.com --90e6ba53aa664f4b17049b8d9238 Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable
9kHz OPs may be interested in this DDS suitable for audio/ VLF using= just a 16F628 PIC, , R-2R ladder and op-amp filter.=A0=A0 It can generate= frequencies up to about 40kHz with typical DDS high resolution / frequenc= y steps, (higher if you overclock the device) =A0offers two-tone FSK opera= tion by toggling a single input line=A0(ideal for DFCW),=A0 The two=A0freq= uencies are stored in non-volatile memory and are=A0user-programmable=A0fr= om=A0an RS232 interface=A0using ASCII text based commands.
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See www.g4jnt.com/PIC_DD= S.zip for=A0full details.
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Andy
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