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 w0JF1Pjk013435 for ; Fri, 19 Jan 2018 16:01:28 +0100 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1ecY4q-0000vq-C9 for rs_out_1@blacksheep.org; Fri, 19 Jan 2018 14:55:32 +0000 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1ecY4p-0000vh-2G for rsgb_lf_group@blacksheep.org; Fri, 19 Jan 2018 14:55:31 +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 1ecY4m-0002w6-87 for rsgb_lf_group@blacksheep.org; Fri, 19 Jan 2018 14:55:29 +0000 Received: from submission (posteo.de [89.146.220.130]) by mout01.posteo.de (Postfix) with ESMTPS id C208D20E62 for ; Fri, 19 Jan 2018 15:55:25 +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=1516373725; bh=1wdw4I1uN3VCJhiYkL61uM/yj9ub+fZV/jDdwLAufMc=; h=Date:From:To:Subject:From; b=S2ZAR6o834NX9BQypimctvkJ9PG+C4BoSakfYcOFWQqFDodpSUYTdGSwVmCv+dDrK E7C5A9zvDJV9itTXQ8e4+2RZgWHauUAzN6lpJn0TQvp2mPF6tubpYf6eLXtuO/hOmO SkwkufAT+yEzPwG2KXTMwphHpaOBa/GUGIk34z/rFMLnZbBGf5NXlCNNL+c01TtNy1 Xt1R6wR50oob6ckYqjQQfWB999jPFrEE/uKGms6wTCsNsSsC9xKE5Vmx9tAK0/WRqm 2H3ILOFOVUmBW+fN4QCyhUaXHEEkkj25Scm9WesAz+3te6W75ml2T/86X0tEXYWA4N c0tbyUhP3xxSw== Received: from customer (localhost [127.0.0.1]) by submission (posteo.de) with ESMTPSA id 3zNP591TSWz9rxL for ; Fri, 19 Jan 2018 15:55:25 +0100 (CET) Message-ID: <5A6206DC.8070400@posteo.de> Date: Fri, 19 Jan 2018 15:55:24 +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: <1610de5da6d-171d-1bc8a@webjas-vaa159.srv.aolmail.net> <5A61E0A9.8020204@posteo.de> <66c7face-5740-d30a-d7b9-d1315d4e9e59@abelian.org> In-Reply-To: <66c7face-5740-d30a-d7b9-d1315d4e9e59@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: Am 19.01.2018 13:58, schrieb Paul Nicholson: > The low S/N on H is caused by high > noise floor. Recently i thought about that... You told us that you are climbing regularly. So there seems to be a mountain near your QTH. Wouldn't it be possible to place the loop antenna (at least for a test) high on the mountain, including a Raspi, octo, GPS, batteries, solar modules, and a GHz link? Like i do on the tree. You could carry a big metallic box up there and paint it in the colour of the surroundings, like rocks (grey). Put some stones into the box so that no one can carry it away. And then put the electronic stuff inside... If you like to climb, you could use LiFePo4 batteries to recharge the batteries once per week, if necessary. At least it would be an exciting project. You can only win. And it is the perfect combination of your hobbies. [...] 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: f62c7cf8eeb8e5a327b71719e9bffff1 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=0.0 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 Am 19.01.2018 13:58, schrieb Paul Nicholson: > The low S/N on H is caused by high > noise floor. Recently i thought about that... You told us that you are climbing regularly. So there seems to be a mountain near your QTH. Wouldn't it be possible to place the loop antenna (at least for a test) high on the mountain, including a Raspi, octo, GPS, batteries, solar modules, and a GHz link? Like i do on the tree. You could carry a big metallic box up there and paint it in the colour of the surroundings, like rocks (grey). Put some stones into the box so that no one can carry it away. And then put the electronic stuff inside... If you like to climb, you could use LiFePo4 batteries to recharge the batteries once per week, if necessary. At least it would be an exciting project. You can only win. And it is the perfect combination of your hobbies. > It is not the rx but I think there are too many > mains harmonics going into the sferic blanker. Did you run some trials to determine the best (for getting a SNR as good as possible) filter settings for the harmonic notch filters? > PS, I am also making some effort to publicise amateur VLF activities, > on various social media groups. Responses tend to indicate that > few people, even VLF enthusiasts, are aware that radio amateurs are > using these frequencies. I hope some publicity will lead to new > receivers in new countries. Very well. A most useful investment of time. 73, Stefan