X-GM-THRID: 1240775708292200704 X-Gmail-Labels: rsgb lf Delivered-To: daveyxm@gmail.com Received: by 10.78.172.10 with SMTP id u10cs332858hue; Mon, 2 Jul 2007 03:12:26 -0700 (PDT) Received: by 10.82.112.16 with SMTP id k16mr12585604buc.1183371145876; Mon, 02 Jul 2007 03:12:25 -0700 (PDT) Return-Path: Received: from post.thorcom.com (post.thorcom.com [193.82.116.20]) by mx.google.com with ESMTP id d24si27558230nfh.2007.07.02.03.12.20; Mon, 02 Jul 2007 03:12:25 -0700 (PDT) Received-SPF: neutral (google.com: 193.82.116.20 is neither permitted nor denied by best guess record for domain of owner-rsgb_lf_group@blacksheep.org) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1I5Ioz-0003Ru-QK for rs_out_1@blacksheep.org; Mon, 02 Jul 2007 11:07:53 +0100 Received: from [83.244.159.144] (helo=relay3.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1I5Ioz-0003Rl-4S for rsgb_lf_group@blacksheep.org; Mon, 02 Jul 2007 11:07:53 +0100 Received: from pne-smtpout1-sn1.fre.skanova.net ([81.228.11.98]) by relay3.thorcom.net with esmtp (Exim 4.63) (envelope-from ) id 1I5Ioy-0003XS-C5 for rsgb_lf_group@blacksheep.org; Mon, 02 Jul 2007 11:07:53 +0100 Received: from [127.0.0.1] (62.20.250.132) by pne-smtpout1-sn1.fre.skanova.net (7.2.076.2) (authenticated as u33233109) id 46758F190033C419 for rsgb_lf_group@blacksheep.org; Mon, 2 Jul 2007 12:07:44 +0200 Message-ID: <4688CE7A.3000501@telia.com> Date: Mon, 02 Jul 2007 12:07:54 +0200 From: "Johan H. Bodin" User-Agent: Thunderbird 2.0.0.4 (Windows/20070604) MIME-Version: 1.0 To: rsgb_lf_group@blacksheep.org References: <200707011513.09596.smtp01@email.it> In-Reply-To: <200707011513.09596.smtp01@email.it> X-Spam-Score: 0.0 (/) X-Spam-Report: autolearn=disabled,none Subject: Re: LF: SAQ received in north Italy Content-Type: text/plain; charset=ISO-8859-1; 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 Status: O X-Status: X-Keywords: X-UID: 1355 Hello Claudio, I measured the "backwave" from SAQ a couple of years ago and found it to be 17dB below the key-down level. > Any info about SAQ key-up ERP radiated? I have no exact figure but since the nominal output is 200kW, and if -17dB is still true, the key-up output power is around 4 kW (!)... I have been told that SAQ once held the "efficiency record" for VLF antennas, about 14%, but I have never got that figure confirmed so take it with a grain of salt. Anyway, the antenna efficiency is worse today than it was when SAQ was young and healthy because the performace of the ground system has deteriorated over time due to corrosion etc. 200 kilometers of copper wire was buried "by hand", without the aid of machines! 73 Johan SM6LKM