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 w6OJfai3007721 for ; Tue, 24 Jul 2018 21:41:39 +0200 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1fi35c-00056S-I7 for rs_out_1@blacksheep.org; Tue, 24 Jul 2018 20:35:20 +0100 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1fi345-000567-A0 for rsgb_lf_group@blacksheep.org; Tue, 24 Jul 2018 20:33:45 +0100 Received: from forward101o.mail.yandex.net ([37.140.190.181]) by relay1.thorcom.net with esmtps (TLSv1.2:ECDHE-RSA-AES256-GCM-SHA384:256) (Exim 4.91_59-0488984) (envelope-from ) id 1fi33x-0008Gd-Gh for rsgb_lf_group@blacksheep.org; Tue, 24 Jul 2018 20:33:39 +0100 Received: from mxback6j.mail.yandex.net (mxback6j.mail.yandex.net [IPv6:2a02:6b8:0:1619::10f]) by forward101o.mail.yandex.net (Yandex) with ESMTP id 023DC1346A19 for ; Tue, 24 Jul 2018 22:33:33 +0300 (MSK) Received: from localhost (localhost [::1]) by mxback6j.mail.yandex.net (nwsmtp/Yandex) with ESMTP id JBgDIIe2aO-XWgSOsrj; Tue, 24 Jul 2018 22:33:32 +0300 X-DKIM-Result: Domain=yandex.ru Result=Signature OK DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=yandex.ru; s=mail; t=1532460812; bh=azhStJ7F5esSGkUZ7KFqfub1VINrdljbzCMFnYoWHzs=; h=From:To:In-Reply-To:References:Subject:Date:Message-Id; b=MgL3jTiOS7SMBa9NM9T5VmphNTuLdxsQS5dRL28oXSBcQs6Wl2AYQhDgVXNNQEFdA qaA10tlzi0IcwFGErt+mAiZl9doPdacfmNFyaRNBkiYew8LiIEo1YtNq4+aI2kwFY9 VTR37w5P/7ekPgqkYqA7nlv1/PWpWqDH91Gr5vRY= Authentication-Results: mxback6j.mail.yandex.net; dkim=pass header.i=@yandex.ru Received: by sas1-5147d6482432.qloud-c.yandex.net with HTTP; Tue, 24 Jul 2018 22:33:32 +0300 From: Roman To: rsgb_lf_group@blacksheep.org In-Reply-To: <2B09532A-9BC1-4195-A6CB-3D6510D49A77@gmail.com> References: <164c230a3b7-c97-798@webjasstg-vaa58.srv.aolmail.net> <4B15F2D2-90AB-40F5-B1AD-671DD0BEB12A@gmail.com> <38999631532367708@iva8-60b043ae986f.qloud-c.yandex.net> <2B09532A-9BC1-4195-A6CB-3D6510D49A77@gmail.com> MIME-Version: 1.0 X-Mailer: Yamail [ http://yandex.ru ] 5.0 Date: Tue, 24 Jul 2018 22:33:32 +0300 Message-Id: <668341532460812@sas1-5147d6482432.qloud-c.yandex.net> X-Spam-Score: -0.7 (/) 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 @@CONTACT_ADDRESS@@ for details. Content preview: Hi John! VY glad about that info was interested for you! Alexander RN3AUS make an experiments with 11 Hz here, but in near zone. Not so long distance. This is experiment and joy-toy, but no communication for caves -) [...] Content analysis details: (-0.7 points, 5.0 required) pts rule name description ---- ---------------------- -------------------------------------------------- -0.7 RCVD_IN_DNSWL_LOW RBL: Sender listed at http://www.dnswl.org/, low trust [37.140.190.181 listed in list.dnswl.org] 0.0 FREEMAIL_FROM Sender email is commonly abused enduser mail provider (rw3adb[at]yandex.ru) -0.0 SPF_PASS SPF: sender matches SPF record 0.0 T_DKIM_INVALID DKIM-Signature header exists but is not valid X-Scan-Signature: 1708620d3ce65bee0beaaede7929769a Subject: Re: LF: Transmitting with a small ferrite antenna Content-Transfer-Encoding: 8bit Content-Type: text/plain; charset=utf-8 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 Hi John! VY glad about that info was interested for you! Alexander RN3AUS make an experiments with 11 Hz here, but in near zone. Not so long distance. This is experiment and joy-toy, but no communication for caves -) If I know any news about VLF communication for caves here - I let you to know! 73! Roman > Roman, > > Many thanks for pointing these out. Some aspects of the French experiment were also described in CREGJ 89 and 92. > > FERRA was also mentioned in CREGJ 89. > > John Hey (SK) would be delighted for his cave radio to be described as “Professional”. It undoubtedly was of that standard, but was not manufactured commercially as we could not find a company to do that. Many people built Heyphones, over a hundred sets were built and approximately 80 were built by John himself. > > 73 John F5VLF > >> On 23 Jul 2018, at 19:41, Roman wrote: >> >> Hi John, LF! >> >> The radioamateur experiment in France several years ago with 3.3 khz PSK31 communication in caves. >> >> http://f6kcz.free.fr/Actualites/2011/Carrieres%20Fleury/Carrieres%20Fleury.htm >> >> Profesional cave phone: >> >> http://bcra.org.uk/creg/heyphone/ >> >> Russian communication system FERRA from Omsk radio-factory: >> >> http://www.radioscanner.ru/forum/topic46535-3.html >> >> 73! >> Roman -- 73! Roman, RW3ADB