Return-Path: X-Spam-DCC: paranoid 1233; Body=3 Fuz1=3 Fuz2=3 X-Spam-Checker-Version: SpamAssassin 3.1.3 (2006-06-01) on lipkowski.org X-Spam-Level: X-Spam-Status: No, score=-0.7 required=5.0 tests=BAYES_00,DNS_FROM_AHBL_RHSBL, 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 tBDLoN1f017868 for ; Sun, 13 Dec 2015 22:50:23 +0100 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1a8ETJ-0002DR-8n for rs_out_1@blacksheep.org; Sun, 13 Dec 2015 21:46:25 +0000 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1a8ETI-0002DI-TC for rsgb_lf_group@blacksheep.org; Sun, 13 Dec 2015 21:46:24 +0000 Received: from mout1.freenet.de ([195.4.92.91]) by relay1.thorcom.net with esmtps (TLSv1.2:ECDHE-RSA-AES256-GCM-SHA384:256) (Exim 4.86) (envelope-from ) id 1a8ESE-0000kR-Od for rsgb_lf_group@blacksheep.org; Sun, 13 Dec 2015 21:46:23 +0000 Received: from [195.4.92.141] (helo=mjail1.freenet.de) by mout1.freenet.de with esmtpa (ID dl4yhf@freenet.de) (port 25) (Exim 4.85 #1) id 1a8ERy-0000xX-Cp for rsgb_lf_group@blacksheep.org; Sun, 13 Dec 2015 22:45:02 +0100 Received: from localhost ([::1]:58532 helo=mjail1.freenet.de) by mjail1.freenet.de with esmtpa (ID dl4yhf@freenet.de) (Exim 4.85 #1) id 1a8ERy-0008Hp-8v for rsgb_lf_group@blacksheep.org; Sun, 13 Dec 2015 22:45:02 +0100 Received: from mx9.freenet.de ([195.4.92.19]:55056) by mjail1.freenet.de with esmtpa (ID dl4yhf@freenet.de) (Exim 4.85 #1) id 1a8EPp-0002Oc-2l for rsgb_lf_group@blacksheep.org; Sun, 13 Dec 2015 22:42:49 +0100 Received: from x4d026b4d.dyn.telefonica.de ([77.2.107.77]:51631 helo=[192.168.178.27]) by mx9.freenet.de with esmtpsa (ID dl4yhf@freenet.de) (TLSv1.2:DHE-RSA-AES128-SHA:128) (port 587) (Exim 4.85 #1) id 1a8EPo-0006am-Uf for rsgb_lf_group@blacksheep.org; Sun, 13 Dec 2015 22:42:49 +0100 To: rsgb_lf_group@blacksheep.org References: <56686FA0.4050707@gmail.com> <56695B15.6010203@abelian.org> <56696950.1040300@abelian.org> <5669B7CE.1090601@freenet.de> <5669E1E3.6070008@abelian.org> <566D6597.4070901@freenet.de> <566D73CD.1070805@freenet.de> <566D8578.3090401@posteo.de> <566DA1BF.9080504@freenet.de> <566DDCC0.2010202@abelian.org> From: =?UTF-8?Q?Wolfgang_B=c3=bcscher?= Message-ID: <566DE657.30104@freenet.de> Date: Sun, 13 Dec 2015 22:42:47 +0100 User-Agent: Mozilla/5.0 (Windows NT 6.3; WOW64; rv:38.0) Gecko/20100101 Thunderbird/38.4.0 MIME-Version: 1.0 In-Reply-To: <566DDCC0.2010202@abelian.org> X-Originated-At: 77.2.107.77!51631 X-Scan-Signature: 7001055fa59a9c23b9831ea6d317a074 Subject: Re: LF: LF EbNaut test from JN80 on 137370 Content-Type: text/plain; charset=windows-1252; 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: 5803 Hi Paul, Am 13.12.2015 um 22:01 schrieb Paul Nicholson: > > I'm puzzled by the I/Q inconsistency. Is there no convention > on the signs in the complex mixer? Perhaps it is > vlfrx-tools and ebnaut which needs to change Q sign? > Don't change yours. I already changed mine :) http://www.qsl.net/dl4yhf/speclab/wavfiles.htm#I_Q_files Seriously: There doesn't seem to be a convention (at least I didn't find a better explanation than the one previously mentioned, see the datasheet of the AD6620). Yours has trigonometric reasons, the other may have traditional reasons (cos, sin). Similar as angle values on a compass and in a mathematician's coordinate system. One prefers the pointer (or needle) to rotate clockwise when the value increases, the other one counter-clockwise. For 'downconverters' (like the AD6620) the negative Q sign may have its reason. For a dedicated 'upconverter' the NCO's Q output may have a different sign. But this is just guesswork. Maybe someone has a more convincing explanation for doing it this way ? Cheers, Wolf .