Return-Path: Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by klubnl.pl (8.14.4/8.14.4/Debian-8+deb8u2) with ESMTP id w0K7c7wF016139 for ; Sat, 20 Jan 2018 08:38:09 +0100 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1ecnX8-0002h8-47 for rs_out_1@blacksheep.org; Sat, 20 Jan 2018 07:25:46 +0000 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1ecnWz-0002gz-S2 for rsgb_lf_group@blacksheep.org; Sat, 20 Jan 2018 07:25:37 +0000 Received: from porthos.netcom.co.uk ([217.72.171.73]) by relay1.thorcom.net with esmtps (TLSv1.2:ECDHE-RSA-AES256-GCM-SHA384:256) (Exim 4.89) (envelope-from ) id 1ecnWx-0005Ua-4B for rsgb_lf_group@blacksheep.org; Sat, 20 Jan 2018 07:25:36 +0000 X-DKIM-Result: Domain=abelian.org Result=Signature OK DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=abelian.org ; s=default; h=Content-Transfer-Encoding:Content-Type:In-Reply-To: MIME-Version:Date:Message-ID:From:References:To:Subject:Sender:Reply-To:Cc: Content-ID:Content-Description:Resent-Date:Resent-From:Resent-Sender: Resent-To:Resent-Cc:Resent-Message-ID:List-Id:List-Help:List-Unsubscribe: List-Subscribe:List-Post:List-Owner:List-Archive; bh=oGEQwAPpLsjIpBqQ46JOfnJfL0fSZPDFCr9RWiXxXAg=; b=wW78gNe3nxILqnIplKm2Tkge18 ii8T4R5G7rlqDEcI+ddwP6s9jr3VKq1VACcCCUxVKPKsAhyGf7JwPzkIdWuEPc4KUsPEq3vrlL6JJ jnEisA8GlmDkwN2Bzuj4Z70ylI1fw+g0m8HAOXl8fiykyWGxS99IMb85R/UGIQA21LLM=; Received: from i-194-106-52-83.freedom2surf.net ([194.106.52.83]:44611 helo=pn.abelian.org) by porthos.netcom.co.uk with esmtpsa (TLSv1.2:ECDHE-RSA-AES256-GCM-SHA384:256) (Exim 4.89_1) (envelope-from ) id 1ecnWu-00076O-9Q for rsgb_lf_group@blacksheep.org; Sat, 20 Jan 2018 07:25:32 +0000 Received: from [127.0.0.1] (localhost [127.0.0.1]) by pn.abelian.org (Postfix) with ESMTP id 969BC4004E1 for ; Sat, 20 Jan 2018 07:25:31 +0000 (UTC) To: rsgb_lf_group@blacksheep.org References: <1610de5da6d-171d-1bc8a@webjas-vaa159.srv.aolmail.net> <5A61E0A9.8020204@posteo.de> <66c7face-5740-d30a-d7b9-d1315d4e9e59@abelian.org> <5A6206DC.8070400@posteo.de> <82dbc9de-7d26-c8d4-12d5-e1faff5a640a@abelian.org> <053801d39150$190cd940$4b268bc0$@comcast.net> From: Paul Nicholson Message-ID: <135c650b-06e4-6d31-fef8-9927be7ebbda@abelian.org> Date: Sat, 20 Jan 2018 07:25:31 +0000 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.3.0 MIME-Version: 1.0 In-Reply-To: <053801d39150$190cd940$4b268bc0$@comcast.net> Content-Language: en-US X-AntiAbuse: This header was added to track abuse, please include it with any abuse report X-AntiAbuse: Primary Hostname - porthos.netcom.co.uk X-AntiAbuse: Original Domain - blacksheep.org X-AntiAbuse: Originator/Caller UID/GID - [47 12] / [47 12] X-AntiAbuse: Sender Address Domain - abelian.org X-Get-Message-Sender-Via: porthos.netcom.co.uk: authenticated_id: catchall@abelian.org X-Authenticated-Sender: porthos.netcom.co.uk: catchall@abelian.org X-Spam-Score: 0.0 (/) X-Spam-Report: Spam detection software, running on the system "relay1.thorcom.net", has NOT identified this incoming email as spam. The original message has been attached to this so you can view it or label similar future email. If you have any questions, see the administrator of that system for details. Content preview: Stefan wrote: > f = 4470.100000 Hz > Start time: 18.JAN.2018 16:00:00 UTC > Symbol period: 60 s > Characters: 2 > CRC bits: 16 > Coding 16K23A (NEW) > Duration: 13h20min [hh:mm] > Antenna current: 300 mA [...] Content analysis details: (0.0 points, 5.0 required) pts rule name description ---- ---------------------- -------------------------------------------------- 0.0 T_DKIM_INVALID DKIM-Signature header exists but is not valid X-Scan-Signature: 739d4fb39bd02fc5a2de5437a39bb056 Subject: Re: VLF: 300 mA on 4470 Hz, 67 km band Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: 7bit X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: X-Spam-Status: No, hits=0.9 required=5.0 tests=FROM_ENDS_IN_NUMS 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 Stefan wrote: > f = 4470.100000 Hz > Start time: 18.JAN.2018 16:00:00 UTC > Symbol period: 60 s > Characters: 2 > CRC bits: 16 > Coding 16K23A (NEW) > Duration: 13h20min [hh:mm] > Antenna current: 300 mA Todmorden: Eb/N0 +8.6 dB, S/N -27.7 dB/1Hz, phase 70.3 *Decoded* Bielefeld: Eb/N0 -2.0 dB, S/N -38.3 dB/1Hz, phase -45.2; Cumiana: Eb/N0 +8.9 dB, S/N -27.4 dB/1Hz, phase -116.3 *Decoded* Warsaw: Eb/N0 -4.4 dB. Many interruption to the uplink and the uplink failed completely at 22:21. Even so, -4.4 dB. It would probably have decoded if the uplink stream had continued. Bielefeld was +13 dB the previous night. What happened there to lose about 18 dB? Jim wrote: > FFT -> excise hum lines -> IFFT, before blanking? That's how vtfilter works when given a -a option. It works well to remove harmonics, but not so well to remove modulation sidebands produced by heavy electrical machines in Todmorden's industry. -- Paul Nicholson --