Return-Path: Received: from mtain-me06.r1000.mx.aol.com (mtain-me06.r1000.mx.aol.com [172.29.96.142]) by air-dc03.mail.aol.com (v129.4) with ESMTP id MAILINDC034-86a14d78ffca79; Thu, 10 Mar 2011 11:43:54 -0500 Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by mtain-me06.r1000.mx.aol.com (Internet Inbound) with ESMTP id 0F6BF38000B9C; Thu, 10 Mar 2011 11:43:52 -0500 (EST) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1Pxix1-0005XL-5i for rs_out_1@blacksheep.org; Thu, 10 Mar 2011 16:42:59 +0000 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1Pxix0-0005XC-On for rsgb_lf_group@blacksheep.org; Thu, 10 Mar 2011 16:42:58 +0000 Received: from mail-iy0-f171.google.com ([209.85.210.171]) by relay1.thorcom.net with esmtp (Exim 4.63) (envelope-from ) id 1Pxiwy-0004mP-B1 for rsgb_lf_group@blacksheep.org; Thu, 10 Mar 2011 16:42:58 +0000 Received: by iyf40 with SMTP id 40so2324173iyf.16 for ; Thu, 10 Mar 2011 08:42:49 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=domainkey-signature:mime-version:in-reply-to:references:date :message-id:subject:from:to:content-type; bh=o6sdhdDl0Nuu7ZqzZrpkU/ed/S2jdCrcwI4M30O/Zos=; b=C/iEN7WqTr1lseHr7o60Fhoy9F9s/vkRzIydubemLZILXMNApFQWmR1kGSIm1IIfKC 8EF1Kwsmxt1UNKLadT+EQRs8iO7xTpYLe66ustqK8x3shTEC7nLwGlEiY14J+ymDjA3M M5OLk/So5KdFgqnl284+GwKRjxQppcrWoYyq0= DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=mime-version:in-reply-to:references:date:message-id:subject:from:to :content-type; b=hmPGg71W4pZ4I19R9CAydwjSyu0w7WCHfFHm1K2AGzLk8Uq2jxaZE88m0xZaJx9guP mt00ZvbSWZ0F6TKivSN6QSQAiDMRPCfNNa/BGwsGdPho+isQeRoKt6rbZ1RyEH6wwfgO Kl1zwrHZE4kL4FV3YmbD+MTKqHYfieLdzSRUc= MIME-Version: 1.0 Received: by 10.42.152.136 with SMTP id i8mr5873449icw.200.1299775369502; Thu, 10 Mar 2011 08:42:49 -0800 (PST) Received: by 10.231.199.197 with HTTP; Thu, 10 Mar 2011 08:42:49 -0800 (PST) In-Reply-To: <520894233e2f4e6e9b7934761a24682d@kabelmail.de> References: <520894233e2f4e6e9b7934761a24682d@kabelmail.de> Date: Thu, 10 Mar 2011 16:42:49 +0000 Message-ID: From: Andy Talbot To: rsgb_lf_group@blacksheep.org DomainKey-Status: good (testing) X-Spam-Score: 0.0 (/) X-Spam-Report: autolearn=disabled,HTML_MESSAGE=0.001 Subject: Re: Re: LF: GRABBER Content-Type: multipart/alternative; boundary=90e6ba61384e2fdf03049e238972 X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: X-Spam-Status: No, hits=0.8 required=5.0 tests=HTML_30_40,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-m016.1 ; domain : gmail.com DKIM : pass x-aol-sid: 3039ac1d608e4d78ffc8268c X-AOL-IP: 195.171.43.25 X-AOL-SPF: domain : blacksheep.org SPF : none X-Mailer: Unknown (No Version) --90e6ba61384e2fdf03049e238972 Content-Type: text/plain; charset=ISO-8859-1 I think we have developed similar hardware with different processors: http://www.g4jnt.com/PIC_DDS.pdf What size A/D and sine lookup table do you use ? Andy G4JNT > no divider in use. the accurate sine wave is generated by the high speed > microcontroller AT90S2313followed by a R matrixc and a lowpass filter > cutqrg 10kHz. > > the phase is GPS sychronized. the time is locked to GPS 1pps. > > negative: the resolution (step size) is 0,3mHz (32-bit). theoretically. > really: 63xmHz. the eeprom doesnt take any notice of the last two signs of > the HEX group. so it can generate near 8970,000Hz: 8970,022xHz or > 8969,959xHz. > --90e6ba61384e2fdf03049e238972 Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable
I think we have developed similar hardware with different processors:=
=A0
What size A/D and sine lookup table do you use ?
=A0
Andy
G4JNT


=A0

no divider in use.= the accurate sine wave is generated by the high speed microcontroller AT9= 0S2313followed by a R matrixc and a =A0lowpass filter cutqrg= 10kHz.

the phase is GPS syc= hronized. the time is locked to GPS 1pps.

negative: the resolu= tion (step size) is 0,3mHz (32-bit). theoretically. really: 63xmHz. the ee= prom doesnt take any notice of the last two signs of the HEX group.=A0so it can generate near 8970,000Hz: =A08970,022xHz= or 8969,959xHz.

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