Return-Path: X-Spam-DCC: paranoid 1102; 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 tBAKd7QN009538 for ; Thu, 10 Dec 2015 21:39:07 +0100 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1a77wd-00013D-Mh for rs_out_1@blacksheep.org; Thu, 10 Dec 2015 20:36:07 +0000 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1a77wd-000134-9S for rsgb_lf_group@blacksheep.org; Thu, 10 Dec 2015 20:36:07 +0000 Received: from parrot.netcom.co.uk ([217.72.171.49]) by relay1.thorcom.net with esmtp (Exim 4.86) (envelope-from ) id 1a77vZ-0003AP-2g for rsgb_lf_group@blacksheep.org; Thu, 10 Dec 2015 20:36:06 +0000 Received: from sb.abelian.org (i-194-106-52-83.freedom2surf.net [194.106.52.83]) by parrot.netcom.co.uk (Postfix) with ESMTP id 88E2B3273EB for ; Thu, 10 Dec 2015 20:25:35 +0000 (GMT) Received: from [127.0.0.1] (localhost [127.0.0.1]) by sb.abelian.org (Postfix) with ESMTP id EF2DB28A0220 for ; Thu, 10 Dec 2015 20:34:43 +0000 (UTC) Message-ID: <5669E1E3.6070008@abelian.org> Date: Thu, 10 Dec 2015 20:34:43 +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: <56686FA0.4050707@gmail.com> <56695B15.6010203@abelian.org> <56696950.1040300@abelian.org> <5669B7CE.1090601@freenet.de> In-Reply-To: X-Scan-Signature: b77892ad90d0261eaf071f4f6cf31464 Subject: Re: LF: LF EbNaut test from JN80 on 137370 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: O X-Status: X-Keywords: X-UID: 5733 In vlfrx-tools I use I = s(t) * cos( 2pi * Fo * t); Q = s(t) * sin( 2pi * Fo * t); where s(t) is the incoming signal and Fo is the local oscillator frequency. Is that right, or should there be a minus sign in there somewhere? If s(t) is VO1NA at 137370.00000 and I set Fo to 137369.9, then when I put I and Q into EbNaut, it needs an offset of +0.1 Hz to decode as you would expect with the LO being 0.1Hz on the low side. For more general mixing and frequency shift, to select the upper sideband of the mixer output I use I - j * Q is that the right way round? When I take I/Q data from an RTL2832 I find I have to invert Q to get the correct sideband, ie I + j * Q. That's the only independent source of I/Q signal that I have available to try. -- Paul Nicholson --