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 x23Iubts011920 for ; Sun, 3 Mar 2019 19:56:43 +0100 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1h0W8T-0006gu-8g for rs_out_1@blacksheep.org; Sun, 03 Mar 2019 18:46:53 +0000 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1h0W7z-0006gc-Po for rsgb_lf_group@blacksheep.org; Sun, 03 Mar 2019 18:46:23 +0000 Received: from lethe.lipkowski.org ([151.80.54.59] helo=lipkowski.org) by relay1.thorcom.net with esmtps (TLSv1.2:ECDHE-RSA-AES256-GCM-SHA384:256) (Exim 4.91) (envelope-from ) id 1h0W7y-0005yx-2p for rsgb_lf_group@blacksheep.org; Sun, 03 Mar 2019 18:46:22 +0000 Received: from mailn.lipkowski.org (localhost [127.0.0.1]) by lipkowski.org (8.14.4/8.14.4/Debian-8+deb8u2) with ESMTP id x23IiHoY001354 for ; Sun, 3 Mar 2019 19:44:17 +0100 Received: from localhost (sq5bpf@localhost) by mailn.lipkowski.org (8.14.4/8.14.4/Submit) with ESMTP id x23IiHLF001350 for ; Sun, 3 Mar 2019 19:44:17 +0100 X-Authentication-Warning: mailn.lipkowski.org: sq5bpf owned process doing -bs Date: Sun, 3 Mar 2019 19:44:16 +0100 (CET) From: Jacek Lipkowski To: rsgb_lf_group@blacksheep.org In-Reply-To: <5C7AD93E.8010402@posteo.de> Message-ID: References: <5C7AD93E.8010402@posteo.de> User-Agent: Alpine 2.11 (DEB 23 2013-08-11) MIME-Version: 1.0 X-Spam-Score-sq5bpf: -2.9 () ALL_TRUSTED,BAYES_00 X-Scanned-By: MIMEDefang 2.75 on 10.1.3.10 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: On Sat, 2 Mar 2019, DK7FC wrote: > I've tried a lot of antenna mixing but did not get better spectrum peaks that > 10.5 dB SNR, so it is quite weak. Best decoder result was 'AV' at rank 70. The transmitted message was: SP Content analysis details: (-0.0 points, 5.0 required) pts rule name description ---- ---------------------- -------------------------------------------------- -0.0 SPF_PASS SPF: sender matches SPF record -0.0 SPF_HELO_PASS SPF: HELO matches SPF record X-Scan-Signature: 739d4fb39bd02fc5a2de5437a39bb056 Subject: Re: LF: VLF ebnaut transmission from Poland Content-Type: TEXT/PLAIN; charset=US-ASCII; format=flowed 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 On Sat, 2 Mar 2019, DK7FC wrote: > I've tried a lot of antenna mixing but did not get better spectrum peaks that > 10.5 dB SNR, so it is quite weak. Best decoder result was 'AV' at rank 70. The transmitted message was: SP > I'm waiting for your detailed description of the experiment. What antenna and > power was used? How did you generate signal? A preliminary descritpion is here: https://klubnl.pl/wpr/en/index.php/2019/03/03/nadawcze-proby-z-dipolem-ziemnym-w-zakresie-vlf/ Around 100W into a 500m long earth dipole, the signal was weak and we were surprised to have Paul receive it (well, maybe not that surprised given Paul's excellent receiver). For the 8270.005Hz carrier we used a GPS generator module (i think it might be just an uBlox GPS inside, but didn't investigate it). I think Marcin bought it on some auction site. For 8270.00073Hz we used an old Neoware terminal with an uBlox neo-7M GPS installed inside. The gps is used to provide a coarse time reference (not the best precision because the 1PPS signal is not used), and as a 20kHz reference signal connected to the terminal sound card. The terminal runs a slightly modified version of Paul's ebsynth, and some custom-written software to control the gps. This is the same generator that i've used in my other tests. I can publish some details in case anyone is interested. VY 73 Jacek / SQ5BPF