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 vBIDALWr020095 for ; Mon, 18 Dec 2017 14:10:23 +0100 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1eQuzd-0001kR-Ew for rs_out_1@blacksheep.org; Mon, 18 Dec 2017 12:58:05 +0000 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1eQuza-0001kI-Ug for rsgb_lf_group@blacksheep.org; Mon, 18 Dec 2017 12:58:02 +0000 Received: from mout01.posteo.de ([185.67.36.65]) by relay1.thorcom.net with esmtps (TLSv1.2:ECDHE-RSA-AES256-GCM-SHA384:256) (Exim 4.89) (envelope-from ) id 1eQuzX-00036q-W0 for rsgb_lf_group@blacksheep.org; Mon, 18 Dec 2017 12:58:01 +0000 Received: from submission (posteo.de [89.146.220.130]) by mout01.posteo.de (Postfix) with ESMTPS id E282620DD4 for ; Mon, 18 Dec 2017 13:57:55 +0100 (CET) X-DKIM-Result: Domain=posteo.de Result=Signature OK DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=posteo.de; s=2017; t=1513601877; bh=fl84/OJbMpEg2J2RdNi7uwodoWujCXR9oSsVNqfTw+4=; h=Date:From:To:Subject:From; b=jskmzxJE3qLOFJbdBM5KGhvWAHVeVT4yWpRuIhM4rQLO+8fyI54i33h7PavOj1BLg juGSGkGofjICjSepZglfyMJo8txy7YFaJ4IZ0yZGabVKKiXSldj9GFWPw9XsWS+lS1 qHgPbwStQ8J2SLDXFsd5cKGbgcSOfJtewd5H640O89D9SH04h2Keg2IJWGbw84ndpp cpLQTqZYUadDFLJgJzrgB1lOFfhqjYMAWIaN9pLIHCQmwjf45RRNm16+UNQSTuFeh2 dksIbcVCp3wX5sPVTofuRdzYqtJuB2qlPGru4Nl+X7Mh2rTfKvKkmVHE5qk3Kf8YYp FgB5auRtytA3w== Received: from customer (localhost [127.0.0.1]) by submission (posteo.de) with ESMTPSA id 3z0gzD6H67z9rxt for ; Mon, 18 Dec 2017 13:56:56 +0100 (CET) Message-ID: <5A37BB18.4090806@posteo.de> Date: Mon, 18 Dec 2017 13:56:56 +0100 From: DK7FC User-Agent: Mozilla/5.0 (Windows; U; Windows NT 6.1; de; rv:1.9.1.8) Gecko/20100227 Thunderbird/3.0.3 MIME-Version: 1.0 To: rsgb_lf_group@blacksheep.org References: <2dbcd2a8-0109-41e4-c0ca-aada17f54de8@abelian.org> <5A2D886D.5060109@posteo.de> <5A31249C.2040307@posteo.de> <5A326AAE.7020808@posteo.de> <6b23a798-f28e-828c-bd8a-43ba8af0fb6a@abelian.org> <346e5dfe-da5f-79e9-c097-e3012a3b74bd@abelian.org> <5A344E83.3020308@posteo.de> In-Reply-To: <5A344E83.3020308@posteo.de> 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: ...8 night transmissions completed. However the last nights transmission stopped at 18. Nov, 04:19 UTC due to strong snow. I'm thinking about a dynamic safety limit: A dangerous fault on the coil will lead to a sudden drop of the antenna current (> 10 mA/sec) whereas snow or strong rain will cause a slower drop of the antenna current. This could be detected in a more 'intelligent' safety function that will quickly react in case of a fault and it will notice when the current drops very slowly and accept even lower currents... [...] Content analysis details: (0.0 points, 5.0 required) pts rule name description ---- ---------------------- -------------------------------------------------- -0.0 T_RP_MATCHES_RCVD Envelope sender domain matches handover relay domain 0.0 T_DKIM_INVALID DKIM-Signature header exists but is not valid X-Scan-Signature: 290c8768709872f914a4ca71ad6bfe49 Subject: Re: VLF: Transatlantic success East to West 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=0.0 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 ...8 night transmissions completed. However the last nights transmission stopped at 18. Nov, 04:19 UTC due to strong snow. I'm thinking about a dynamic safety limit: A dangerous fault on the coil will lead to a sudden drop of the antenna current (> 10 mA/sec) whereas snow or strong rain will cause a slower drop of the antenna current. This could be detected in a more 'intelligent' safety function that will quickly react in case of a fault and it will notice when the current drops very slowly and accept even lower currents... 73, Stefan Am 15.12.2017 23:36, schrieb DK7FC: > Thanks Paul, > > Oh oh oh it is not easy at all! The stacking works with limited > improvement over that path. Wonder if 8270 Hz would work better... > The next transmission is already running.. > One could correct the phase and stack then. But this would not be > legitimately because the message is unknown to the receiving station, > so it can't know the phase before the decode happens. > > I'm missing the really low frequencies :-) > > 73, Stefan > > Am 15.12.2017 19:32, schrieb Paul Nicholson: >> >> Still not there yet. >> >> 2017-12-10/11 Eb/N0 = -13.1 dB (very noisy night) >> 2017-12-11/12 Eb/N0 = -6.3 dB, phase 125.3 >> 2017-12-12/13 Eb/N0 = -6.8 dB, phase 143.2 >> 2017-12-13/14 Eb/N0 = -19.6 dB >> 2017-12-14/15 Eb/N0 = -6.0 dB, phase 68.8 >> >> Stacking >> >> 11/12 + 12/13 gives Eb/N0 = -3.6 dB. >> 11/12 + 12/13 + 14/15 gives Eb/N0 = -3.0 dB. >> >> Good signal last night but the phase was a bit >> different. >> >> -- >> Paul Nicholson >> -- >> >