Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on lipkowski.org X-Spam-Level: X-Spam-Status: No, score=-2.3 required=5.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, RCVD_IN_DNSWL_MED,SPF_PASS autolearn=ham autolearn_force=no version=3.4.0 X-Spam-DCC: : mailn 1480; Body=3 Fuz1=3 Fuz2=3 Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by lipkowski.org (8.14.4/8.14.4/Debian-8+deb8u1) with ESMTP id v2HNA2IP018346 for ; Sat, 18 Mar 2017 00:10:03 +0100 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1cp0rb-0004fI-4H for rs_out_1@blacksheep.org; Fri, 17 Mar 2017 23:00:51 +0000 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1cp0rE-0004f9-DF for rsgb_lf_group@blacksheep.org; Fri, 17 Mar 2017 23:00:28 +0000 Received: from lethe.lipkowski.org ([178.32.151.135] helo=lipkowski.org) by relay1.thorcom.net with esmtps (TLSv1.2:ECDHE-ECDSA-AES256-GCM-SHA384:256) (Exim 4.89) (envelope-from ) id 1cp0rB-0007Wg-A0 for rsgb_lf_group@blacksheep.org; Fri, 17 Mar 2017 23:00:26 +0000 Received: from mailn.lipkowski.org (localhost [127.0.0.1]) by lipkowski.org (8.14.4/8.14.4/Debian-8+deb8u1) with ESMTP id v2HN0pxW018327 (version=TLSv1/SSLv3 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT) for ; Sat, 18 Mar 2017 00:00:51 +0100 Received: from localhost (sq5bpf@localhost) by mailn.lipkowski.org (8.14.4/8.14.4/Submit) with ESMTP id v2HN0oYi018324 for ; Sat, 18 Mar 2017 00:00:50 +0100 X-Authentication-Warning: mailn.lipkowski.org: sq5bpf owned process doing -bs Date: Sat, 18 Mar 2017 00:00:50 +0100 (CET) From: Jacek Lipkowski To: rsgb_lf_group@blacksheep.org In-Reply-To: <58CB0A5F.8010109@posteo.de> Message-ID: References: <58CB0A5F.8010109@posteo.de> User-Agent: Alpine 2.11 (DEB 23 2013-08-11) MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.75 X-Scanned-By: MIMEDefang 2.75 on 10.1.3.10 X-Scan-Signature: f62c7cf8eeb8e5a327b71719e9bffff1 Subject: Re: LF: Re: MF QSO Party - Goodbye Winter 2017 Content-Type: TEXT/PLAIN; charset=US-ASCII; format=flowed 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: RO X-Status: X-Keywords: X-UID: 10923 On Thu, 16 Mar 2017, DK7FC wrote: > I'm already dancing on another party, the transmitter is running 'key-dwon' since almost a week now. On the weekend there will be a > rain period but i want to risk to continue with the transmission, hoping there will be no flash over. So far the idea is to run it for > 2 weeks! > Thus the antenna is booked for ULF over the weekend. Could we try around 3053Hz after that? 3053 has 1/4 wavelength more at around 900km distance. The reason is that i'm not sure we're well in the far field region at this distance (we're way past 2 wavelengths, but maybe we could still gain a few dB from this). If you transmit with an e-field antenna, and the distance is N/4*wavelength where N is an uneven integer, then i would have a better signal with a h-field antenna. Making the distance in wavelengths 1/4 wavelength longer would change it into e-field again. BTW this is probably the reason that most people didn't get further than 10km on 9kHz: they used the same kind of antenna (so with transmitting with an e-field antenna, they would get better results with a h-field antenna once they get near 1/4 wavelength, and vice versa). VY 73 Jacek / SQ5BPF