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 w6O87H6H004914 for ; Tue, 24 Jul 2018 10:07:19 +0200 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1fhs9B-00046p-H8 for rs_out_1@blacksheep.org; Tue, 24 Jul 2018 08:54:17 +0100 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1fhs8V-00046e-Ch for rsgb_lf_group@blacksheep.org; Tue, 24 Jul 2018 08:53:35 +0100 Received: from mail-wr1-x42b.google.com ([2a00:1450:4864:20::42b]) by relay1.thorcom.net with esmtps (TLSv1.2:ECDHE-RSA-AES256-GCM-SHA384:256) (Exim 4.91_59-0488984) (envelope-from ) id 1fhs8R-0007Do-14 for rsgb_lf_group@blacksheep.org; Tue, 24 Jul 2018 08:53:33 +0100 Received: by mail-wr1-x42b.google.com with SMTP id v14-v6so3114429wro.5 for ; Tue, 24 Jul 2018 00:53:25 -0700 (PDT) X-DKIM-Result: Domain=gmail.com Result=Good and Known Domain DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=from:content-transfer-encoding:mime-version:subject:date:references :to:in-reply-to:message-id; bh=pDsgKNkAD4nFqnJ7qGxc4MZggjjnY84/HcL73ywtC6M=; b=VvLxSPcFcpSoeMPArbIlhWDIKxmJOSqT0YLI/Rudohzq+st8MwYQZObS2PE3KAsIcj VVZTUDM0KamHaU7WoadKg5e25OFx6AQyB2MZFhEyvbCnZTZl1O/0tOkOnh+bIqWia9Ma 3R6E8fK5VOwWspV7jlyO1lpCWWDTz+CvH6+I/t0UOzLxbLtmTi+5VPNyLMW4aHtnjLVx 4h3fSUjZtxIMoJY+YJ9TjJEBCyJlfhwSyUtup+PpWAA6l2amJt6BAMKYeKf+m3ELAFF7 MI4Y2L7TFqweIHCPxHdblGluK+dzf+DGuDXxTmULqa5wxeAfxv3hNymVCdjGp/2AcBbJ g4hw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:content-transfer-encoding:mime-version :subject:date:references:to:in-reply-to:message-id; bh=pDsgKNkAD4nFqnJ7qGxc4MZggjjnY84/HcL73ywtC6M=; b=d2NRrjOBVBzatdxi8Mk+we/B3jvjvdjTGW/mOkSNIgMA1AWbkM8cGwUCgSksWb8L34 SmymMa7usV27Cu+g/mZntPTkKNxqNQWn/KHH8j3K5u5OzS/xH98GO4G0nvPPZghQcBxD SLXDxjTAwnEd6BYA0xXTubkotRhP7I0406U+NvFs757MJHWxGC2FTc2qhX3x5YdkF49P o+IXCSe6Q0N9oatuo2UhUOl6h65PcY2S3T9lqu6TVCBnrcAz9V89/N9d3FNQNbVynJt1 cnAfg8IJxgQDgl6wvbwG5GRVJ9/icNvQ1GIVVmlnFoqhAypeLDSlGURrNOrU06a3/I5v JJeg== X-Gm-Message-State: AOUpUlExjmYo7GmJpFGCMzNqm7dT6VonRYsi/9JpHkjJ8X1361+p1sKb YgHsKDx7D8sL9k16XsPyzxn+RNz+ X-Google-Smtp-Source: AAOMgpewJwUFEnvVkRlj9XrDUtvHhYc1ebXokDOViNZD+KtenDmyz8+bOq9KrTOTg5ZdJwfqjapWnA== X-Received: by 2002:a5d:4701:: with SMTP id y1-v6mr10722351wrq.107.1532418804871; Tue, 24 Jul 2018 00:53:24 -0700 (PDT) Received: from [127.0.0.1] ([82.98.23.94]) by smtp.gmail.com with ESMTPSA id j11-v6sm10305931wrr.37.2018.07.24.00.53.23 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Tue, 24 Jul 2018 00:53:24 -0700 (PDT) From: John Rabson Mime-Version: 1.0 (Mac OS X Mail 11.5 \(3445.9.1\)) Date: Tue, 24 Jul 2018 09:53:22 +0200 References: <164c230a3b7-c97-798@webjasstg-vaa58.srv.aolmail.net> <4B15F2D2-90AB-40F5-B1AD-671DD0BEB12A@gmail.com> <38999631532367708@iva8-60b043ae986f.qloud-c.yandex.net> To: rsgb_lf_group@blacksheep.org In-Reply-To: <38999631532367708@iva8-60b043ae986f.qloud-c.yandex.net> Message-Id: <2B09532A-9BC1-4195-A6CB-3D6510D49A77@gmail.com> X-Mailer: Apple Mail (2.3445.9.1) X-Spam-Score: 0.3 (/) 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: 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. [...] Content analysis details: (0.3 points, 5.0 required) pts rule name description ---- ---------------------- -------------------------------------------------- -0.0 RCVD_IN_DNSWL_NONE RBL: Sender listed at http://www.dnswl.org/, no trust [2a00:1450:4864:20:0:0:0:42b listed in] [list.dnswl.org] 0.2 FREEMAIL_ENVFROM_END_DIGIT Envelope-from freemail username ends in digit (john.rabson07[at]gmail.com) 0.0 FREEMAIL_FROM Sender email is commonly abused enduser mail provider (john.rabson07[at]gmail.com) -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: 64437c466041e93ffedda7fb96b22b71 Content-Type: text/plain; charset=utf-8 Subject: Re: LF: Transmitting with a small ferrite antenna X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: X-Spam-Status: No, hits=0.9 required=5.0 tests=FROM_ENDS_IN_NUMS 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 Content-Transfer-Encoding: 8bit X-MIME-Autoconverted: from quoted-printable to 8bit by klubnl.pl id w6O87H6H004914 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