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 tBAM4v4b009840 for ; Thu, 10 Dec 2015 23:04:57 +0100 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1a79HS-00026Y-Tu for rs_out_1@blacksheep.org; Thu, 10 Dec 2015 22:01:42 +0000 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1a79HS-00026P-M0 for rsgb_lf_group@blacksheep.org; Thu, 10 Dec 2015 22:01:42 +0000 Received: from parrot.netcom.co.uk ([217.72.171.49]) by relay1.thorcom.net with esmtp (Exim 4.86) (envelope-from ) id 1a79GO-0003SP-Hb for rsgb_lf_group@blacksheep.org; Thu, 10 Dec 2015 22:01:41 +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 E72063273FE for ; Thu, 10 Dec 2015 21:51:08 +0000 (GMT) Received: from [127.0.0.1] (localhost [127.0.0.1]) by sb.abelian.org (Postfix) with ESMTP id 4929228A0121 for ; Thu, 10 Dec 2015 22:00:18 +0000 (UTC) Message-ID: <5669F5F2.2000201@abelian.org> Date: Thu, 10 Dec 2015 22:00:18 +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> <5669E1E3.6070008@abelian.org> <5669EBD9.6070609@virginbroadband.com.au> In-Reply-To: <5669EBD9.6070609@virginbroadband.com.au> X-Scan-Signature: 2e2f7cbbe9f38dd7bf3fac4fc012e6fc 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: 5738 Those Zoom FFT pages show -sin() as the multiplier for Q. But a lot of other sources show +sin(), as I use in vlfrx-tools. Andy's hardware is using +sin and the spectrum is correct in Spectrum Lab but is reversed with vlfrx-tools/EbNaut. And RTL2832 appears to use -sin() because I have to use -Q in vlfrx-tools. Wolf wrote: > When loading Andy's file in a curve editor, I see the > 2nd channel leads the 1st by 90 degrees. That sounds like Q is using +sin() then. It's a puzzle why Andy is having to give the opposite frequency offset to the decoder. Perhaps I'll sleep on this one. I/Q signal processing is always easier when wide awake. -- Paul Nicholson --