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 vBAIbd9R022044 for ; Sun, 10 Dec 2017 19:37:42 +0100 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1eO6Na-0004Rp-Rw for rs_out_1@blacksheep.org; Sun, 10 Dec 2017 18:31:10 +0000 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1eO6Mj-0004RQ-NT for rsgb_lf_group@blacksheep.org; Sun, 10 Dec 2017 18:30:17 +0000 Received: from smtp3web.tin.it ([212.216.176.237]) by relay1.thorcom.net with esmtp (Exim 4.89) (envelope-from ) id 1eO6Mf-00005P-N4 for rsgb_lf_group@blacksheep.org; Sun, 10 Dec 2017 18:30:16 +0000 Received: from feu20 (10.192.64.30) by smtp3web.tin.it (8.6.060.43) id 5A119E640065FAC2; Sun, 10 Dec 2017 19:30:11 +0100 Received: from (82.56.138.65) by wmlighttin.pc.tim.it; Sun, 10 Dec 2017 19:30:11 +0100 Message-ID: <16041b10ff3.marcocadeddu@tin.it> Date: Sun, 10 Dec 2017 19:30:11 +0100 (CET) From: "marcocadeddu@tin.it" To: Cc: mike@unixnut.net Mime-Version: 1.0 X-Originating-IP: 82.56.138.65 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: ...almost unbelivable! Congrats to Stefan :-) and of course to Mike! When you try long path Stefan? :-))) Unfortunately I have to give up :-( until I add another vacuum relay in the antenna box and try to tune the tx antenna for VLF reception, I tried alla available antennas but no able to copy the carrier. [...] Content analysis details: (-0.0 points, 5.0 required) pts rule name description ---- ---------------------- -------------------------------------------------- 0.0 FREEMAIL_FROM Sender email is commonly abused enduser mail provider (marcocadeddu[at]tin.it) -0.0 T_RP_MATCHES_RCVD Envelope sender domain matches handover relay domain X-Scan-Signature: f1498eebf16822c5ea85527a90413169 Subject: R: VLF: Transatlantic success East to West Content-Type: text/plain;charset="UTF-8" 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=1.1 required=5.0 tests=MAILTO_TO_SPAM_ADDR 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 ...almost unbelivable! Congrats to Stefan :-) and of course to Mike! When you try long path Stefan? :-))) Unfortunately I have to give up :-( until I add another vacuum relay in the antenna box and try to tune the tx antenna for VLF reception, I tried alla available antennas but no able to copy the carrier. 73 Marco, IK1HSS ----Messaggio originale---- Da: vlf0403@abelian.org Data: 10-dic-2017 16.22 A: Cc: "Michael Smith" Ogg: VLF: Transatlantic success East to West Stefan wrote: > f = 17470.1000 Hz > Start time: 07.Dec.2017 21:30:00 UTC > Symbol period: 60 s > Characters: 1 > CRC bits: 10 > Coding 16K21A and > I transmitted the message last night again [9th] A good signal at Forest, VA, from the overnight transmission 9th/10th, via Mike Smith's VLF receiver at 37.35348N,79.19450W, near Lynchburg. Decoded 'T' with Eb/N0 = +1.5 dB, BER 42.5%, rank 9; S/N was -36.29 dB in 1Hz; Reference phase 120,135,120,135; Congratulations to Stefan DK7FC and Mike KE4RJQ for the first VLF east-to-west transatlantic message. Distance is 6817.7 km. This is a most significant achievement. East to west is some 20dB harder than the other direction! You can run the decode yourself from the 'vt' file at http://abelian.org/vlf/dk7fc.171209f4.vt The file is 4.2 Mbyte, 2 I/Q sample pairs/second. It was extracted from Mike's raw recording with vtread -T2017-12-09_21:30,+34590 /data/raw-fb | vtfilter -h bp,f=17470,w=3000 -h bs,f=16400,w=600 -h bs,f=18300, w=800 | vtblank -a13 -d0 -t100 -v | vtmult -f 17470.1 | vtresample -r480 | vtresample -r2 > dk7fc.171209f4.vt Decode with: vtraw -oa dk7fc.171209f4.vt | ebnaut -dp16K21A -r2 -S60 -k10 -N1 -PS15 -L800 -v -c8 -a50 This was a clean decode with no false detects to get in the way. The signal is extremely weak but gives an unambiguous decode. Please CC Mike in any replies, as he is not on the RSGB mailing list. -- Paul Nicholson --