Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on lipkowski.org X-Spam-Level: X-Spam-Status: No, score=0.0 required=5.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, SPF_PASS autolearn=ham autolearn_force=no version=3.4.0 X-Spam-DCC: wuwien: mailn 1290; Body=2 Fuz1=2 Fuz2=2 Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by lipkowski.org (8.14.4/8.14.4/Debian-8+deb8u2) with ESMTP id v85AHWrS028237 for ; Tue, 5 Sep 2017 12:17:33 +0200 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1dpAqo-0007U7-7x for rs_out_1@blacksheep.org; Tue, 05 Sep 2017 11:12:58 +0100 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1dpAqn-0007Ty-O0 for rsgb_lf_group@blacksheep.org; Tue, 05 Sep 2017 11:12:57 +0100 Received: from mout02.posteo.de ([185.67.36.66]) by relay1.thorcom.net with esmtps (TLSv1.2:ECDHE-RSA-AES256-GCM-SHA384:256) (Exim 4.89) (envelope-from ) id 1dpAql-0006Nb-2C for rsgb_lf_group@blacksheep.org; Tue, 05 Sep 2017 11:12:56 +0100 Received: from submission (posteo.de [89.146.220.130]) by mout02.posteo.de (Postfix) with ESMTPS id EDCDF20CAF for ; Tue, 5 Sep 2017 12:12:52 +0200 (CEST) Received: from customer (localhost [127.0.0.1]) by submission (posteo.de) with ESMTPSA id 3xmjFw210wz10HS for ; Tue, 5 Sep 2017 12:12:52 +0200 (CEST) Message-ID: <59AE78A4.6070408@posteo.de> Date: Tue, 05 Sep 2017 12:12:52 +0200 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: <15e4d1026af-c0a-3b162@webjas-vad110.srv.aolmail.net> <59AE7238.9040600@posteo.de> In-Reply-To: <59AE7238.9040600@posteo.de> X-Scan-Signature: 87966b345956c8ef3389b993f6a18f4e Subject: VLF: Just an idea... Content-Type: text/plain; charset=UTF-8; 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 2.75 Status: O X-Status: X-Keywords: X-UID: 12511 Hi VLF, I just got an idea: From the last experiments on various VLF and ULF frequencies we saw different phase angles between day and night for different frequencies (and different locations). Maybe Paul can give an overview of the phases between our TX and RX locations for 8270, 6470, 5170, 2970, 4470 Hz... I remember he said that there is a day-night offset of 20 deg on 4470 Hz. Now, can we find a (or some) frequency where that offset is 0 ? Then we could try to run EbNaut messages with very long symbol lengths, instead of stacking. Of course, the terminator will mess up the SNR for a few hours. But in the end it could be an interesting game. So far, the longest symbol lengths used were 120 seconds or so. It would be interesting to use 600 seconds or so. I could try to send a 1 character message with 0 CRC bits, which would be the next interesting attempt. Just a thought :-) 73, Stefan