Return-Path: Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by mtain-mg03.r1000.mx.aol.com (Internet Inbound) with ESMTP id 24D843800005B; Mon, 21 Jan 2013 19:49:29 -0500 (EST) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1TxS1m-00009p-Bd for rs_out_1@blacksheep.org; Tue, 22 Jan 2013 00:47:50 +0000 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1TxS1l-00009g-Ud for rsgb_lf_group@blacksheep.org; Tue, 22 Jan 2013 00:47:49 +0000 Received: from mail-ie0-f171.google.com ([209.85.223.171]) by relay1.thorcom.net with esmtps (TLSv1:RC4-SHA:128) (Exim 4.77) (envelope-from ) id 1TxS1j-0004x9-Ek for rsgb_lf_group@blacksheep.org; Tue, 22 Jan 2013 00:47:48 +0000 Received: by mail-ie0-f171.google.com with SMTP id 9so6972627iec.2 for ; Mon, 21 Jan 2013 16:47:25 -0800 (PST) X-DKIM-Result: Domain=gmail.com Result=Good and Known Domain DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:x-received:in-reply-to:references:date:message-id :subject:from:to:content-type; bh=ZFhJBDe9xeyfpihb3kZQiKhlxoURujXFdsZkJkxnD1s=; b=LSuNRt6dwMMEO80Zm5HA6V+RpHUK2yPCVZyJvzh4n/0OC3k+CGsMleJOV6ejFgeCIu YLEUOCBS2xOlbKYsvvtS46dEhQxxtl3sHdwZFgArlmUBKs2R9dUdEiykn2bNE504LRQR wSm342BBy4Mmn5zm1yrRHKYNhBECjcrVhk9z61ujwu4vNbBFu6SE09dPfdunuejRiOMR Qciq9HrX9HMmiN3ZaQ0z0ZclTudkPqQ6JgfakvIjQTSUIYLZeZt6SDK9BUjkdCv8gkej N70YM6mMQ+VCHh1DjoC7muI9tp6L7OC4QiSjzEATce3lb8XNS2GjbKRubLAEWqcMesma ulRw== MIME-Version: 1.0 X-Received: by 10.50.13.173 with SMTP id i13mr10337869igc.93.1358815644823; Mon, 21 Jan 2013 16:47:24 -0800 (PST) Received: by 10.231.149.195 with HTTP; Mon, 21 Jan 2013 16:47:24 -0800 (PST) In-Reply-To: References: Date: Tue, 22 Jan 2013 11:47:24 +1100 Message-ID: From: Dimitrios Tsifakis To: rsgb_lf_group@blacksheep.org X-Spam-Score: -0.7 (/) X-Spam-Report: Spam detection software, running on the system "relay1.thorcom.net", has identified this incoming email as possible spam. The original message has been attached to this so you can view it (if it isn't spam) or label similar future email. If you have any questions, see the administrator of that system for details. Content preview: 2013/1/22 Roger Lapthorn : > Now, to me these figures seem far too low, so perhaps the noise level is > much higher than 3uV/m or my maths are wrong? The noise floor is variable (over time) and the noise in WSPR S/N is calculated on a 2500 Hz window that may contain all sorts of RF garbage that come and go and will influence the noise calculation. [...] Content analysis details: (-0.7 points, 5.0 required) pts rule name description ---- ---------------------- -------------------------------------------------- -0.7 RCVD_IN_DNSWL_LOW RBL: Sender listed at http://www.dnswl.org/, low trust [209.85.223.171 listed in list.dnswl.org] 0.0 FREEMAIL_FROM Sender email is commonly abused enduser mail provider (dtsifakis[at]gmail.com) -0.0 SPF_PASS SPF: sender matches SPF record 0.0 T_DKIM_INVALID DKIM-Signature header exists but is not valid X-Scan-Signature: 59677119386dcf9f1872cb454dc1331d Subject: Re: LF: 472kHz ERP calculations based on WSPR results Content-Type: text/plain; charset=ISO-8859-1 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=none 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: mtain-mg03.r1000.mx.aol.com ; domain : gmail.com DKIM : pass x-aol-sid: 3039ac1d60cb50fde2183c3d X-AOL-IP: 195.171.43.25 X-AOL-SPF: domain : blacksheep.org SPF : none 2013/1/22 Roger Lapthorn : > Now, to me these figures seem far too low, so perhaps the noise level is > much higher than 3uV/m or my maths are wrong? The noise floor is variable (over time) and the noise in WSPR S/N is calculated on a 2500 Hz window that may contain all sorts of RF garbage that come and go and will influence the noise calculation. I think WSPR reports are good for relative comparisons between multiple reception reports of the same transmitter at the same receiver. Even then, a plasma TV or a CFL may be turned on or off, and that may affect the S/N reported. 73, Dimitris VK1SV