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 x19N446k010684 for ; Sun, 10 Feb 2019 00:04:10 +0100 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1gsbaZ-0006it-QK for rs_out_1@blacksheep.org; Sat, 09 Feb 2019 22:59:11 +0000 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1gsbaU-0006ik-Ei for rsgb_lf_group@blacksheep.org; Sat, 09 Feb 2019 22:59:06 +0000 Received: from mail-qt1-x82e.google.com ([2607:f8b0:4864:20::82e]) by relay1.thorcom.net with esmtps (TLSv1.2:ECDHE-RSA-AES256-GCM-SHA384:256) (Exim 4.91) (envelope-from ) id 1gsbaR-00061P-UZ for rsgb_lf_group@blacksheep.org; Sat, 09 Feb 2019 22:59:05 +0000 Received: by mail-qt1-x82e.google.com with SMTP id y4so8163714qtc.10 for ; Sat, 09 Feb 2019 14:59:03 -0800 (PST) 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=mime-version:references:in-reply-to:from:date:message-id:subject:to; bh=qAVo9u1Ght+nq5vTlFM676fbqSl5IgocCSvr90M6Mfo=; b=R7DAaRooWagpP8yFcKE/flrUws5oi/vJ6De5VU0gEORTqZy/YBLdTCtPe5q93zbPIr 53j0b9tu/1wICKHRxXk7YJObV5JxapvKIz5OD6tKDP6aglU5Bk2y01hUalgOIrlnDmar g6zDBVoPSSLlggUmr7BBkQICPBV5oHyQcGUqwdVEcIu9xCTriAb+9gA9Ra1lUrT2++mW NQ36d0vgK4KB3sU0Pcp/K7x9fOq2wsFrB/t5WiNzt5sEKGMzT4njEdprn/JRN4hidXK7 3z3eoZeJ+eqICFstgL6TS2Erh+Rbvxm2fqkJ78FCYQWTowL7NibWXCvIhnpMTBW82/bZ 5SIA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to; bh=qAVo9u1Ght+nq5vTlFM676fbqSl5IgocCSvr90M6Mfo=; b=ROiyF14JzQfmEGJftaxXvX8u9opGRHeJONVS1f20lF+leZBSBTIwrgMq1DHSDLHq6n 2CIBgmUeDxPaiiZRxP96di9615stRqFIYIfpNFv0bavlutC8Vlu2nvrA2BRjFM5RGhSD MuYR94W0TsW4ybNIrmTeYhGMJlzrQCkvf1mipsp9P6vHdQu4nb58j/a9SA0uVRLC5vVJ 68b86BYI8nZ42CkRnUYdgRAr8vIH4Lacvxwb6i8WhBF8bLWexNxQXBs/GtZYb51n/yxN W912fxJOoM230wwvjsOX+Cr7vzNso5EPelvHLANSBTqM42heoHKnI6PfdVp0qPvysR5j 3IwQ== X-Gm-Message-State: AHQUAubwsrhtF3ppZ42aTo9dldGVjcJokLwfNRWSJu34Q94JWrhaY1NQ N548uPKqrff69xw5T74XKJn4OzNW+4hv2GDysKNhQQ== X-Google-Smtp-Source: AHgI3IYgZu0bA+cyk5c1WEnoQ7VX/T9CNpL1V9b7kyNPitrZqFdwmtmeQ8h9sbqIMvvHBvd3zoJqgHxbsMSZWpUzF7Q= X-Received: by 2002:ac8:2a39:: with SMTP id k54mr3016951qtk.26.1549753140947; Sat, 09 Feb 2019 14:59:00 -0800 (PST) MIME-Version: 1.0 References: <168c41b89f6.marcocadeddu@tin.it> <5C5BE905.2010904@posteo.de> <5C5D8F53.1080409@posteo.de> <5C5EC5EB.7040209@posteo.de> In-Reply-To: From: Dimitrios Tsifakis Date: Sun, 10 Feb 2019 09:58:49 +1100 Message-ID: To: rsgb_lf_group@blacksheep.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: > Not stellar SNR but the radiated power I reported originally (7.5 uW) > is not correct. I think the capacitors have sustained some damage > because they seem to introduce a series R of about 6 ohm! [...] Content analysis details: (0.0 points, 5.0 required) pts rule name description ---- ---------------------- -------------------------------------------------- -0.0 RCVD_IN_DNSWL_NONE RBL: Sender listed at http://www.dnswl.org/, no trust [2607:f8b0:4864:20:0:0:0:82e listed in] [list.dnswl.org] -0.0 SPF_PASS SPF: sender matches SPF record 0.0 FREEMAIL_FROM Sender email is commonly abused enduser mail provider (dtsifakis[at]gmail.com) X-Scan-Signature: 7aa9ad08848e488e22e0ff1d71f4ef1d Subject: Re: VLF: in VK? 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 > Not stellar SNR but the radiated power I reported originally (7.5 uW) > is not correct. I think the capacitors have sustained some damage > because they seem to introduce a series R of about 6 ohm! After I > adjusted for that extra R, I now think that my radiated power was > closer to 2.3 uW. No wonder they got hot, poor things!! So if I fix > that problem I will gain another ~ 5dB for the same amplifier power. Well, what do you know! The unexpected losses are not just the capacitors (their contribution is probably small). It is also the coaxial cable that I used between the antenna feedpoint and the amplifier. One of the cables uses copper plated steel as the inner core (which of course has a plating depth appropriate for the expected skin effect at the _intended_ frequency of operation), the other has copper plated aluminium (I think!). Even the jumper leads I used have losses and it all adds up. I now appreciate the problem of using a very low impedance antenna! Perhaps I should install another transmission line from the inside of the house to the antenna but not like the others, I should get the thickest speaker cable I can find and use that :-) 73, Dimitris VK2COW