Return-Path: Received: from rly-md07.mx.aol.com (rly-md07.mail.aol.com [172.20.29.145]) by air-md09.mail.aol.com (v121.4) with ESMTP id MAILINMD091-91848569c32337; Mon, 16 Jun 2008 13:01:09 -0400 Received: from post.thorcom.com (post.thorcom.com [193.82.116.20]) by rly-md07.mx.aol.com (v121.5) with ESMTP id MAILRELAYINMD078-91848569c32337; Mon, 16 Jun 2008 13:00:37 -0400 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1K8I2v-0004UT-EB for rs_out_1@blacksheep.org; Mon, 16 Jun 2008 17:59:09 +0100 Received: from [193.82.116.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1K8I2u-0004UK-TQ for rsgb_lf_group@blacksheep.org; Mon, 16 Jun 2008 17:59:08 +0100 Received: from smtp-out03.email.it ([212.97.34.23]) by relay1.thorcom.net with esmtp (Exim 4.63) (envelope-from ) id 1K8I2p-0005BG-3Y for rsgb_lf_group@blacksheep.org; Mon, 16 Jun 2008 17:59:08 +0100 Received: from localhost (localhost.localdomain [127.0.0.1]) by smtp-out03.email.it (Postfix) with ESMTP id 0344D54018 for ; Mon, 16 Jun 2008 18:58:54 +0200 (CEST) X-Virus-Scanned: amavisd-new at email.it Received: from smtp-out03.email.it ([127.0.0.1]) by localhost (smtp-out03.email.it [127.0.0.1]) (amavisd-new, port 10024) with LMTP id R2zJAemRskB8 for ; Mon, 16 Jun 2008 18:58:53 +0200 (CEST) Received: from ppp-62-11-235-77.dialup.tiscali.it (ppp-62-11-235-77.dialup.tiscali.it [62.11.235.77]) by smtp-out03.email.it (Postfix) with ESMTP id 183C254046 for ; Mon, 16 Jun 2008 18:58:52 +0200 (CEST) From: Claudio Pozzi To: rsgb_lf_group@blacksheep.org Date: Sun, 15 Jun 2008 17:08:15 +0200 User-Agent: KMail/1.9.5 References: <57a24ca70806131827p690673d0kb0b8c0d76d85fddc@mail.gmail.com> <1K7Y7g-1RYRXM0@fwd31.t-online.de> In-Reply-To: <1K7Y7g-1RYRXM0@fwd31.t-online.de> MIME-Version: 1.0 Content-Disposition: inline Message-Id: <200806151708.17345.smtp01@email.it> X-Karma: 0: X-Spam-Score: 0.8 (/) X-Spam-Report: autolearn=disabled,DATE_IN_PAST_24_48=0.805 Subject: Re: LF: Finbar's Compact 500kHz Vertical Content-Type: text/plain; charset="utf-8" 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=0.9 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 X-AOL-IP: 193.82.116.20 X-AOL-SCOLL-AUTHENTICATION: domain : post.thorcom.co ; SPF_helo = X-AOL-SCOLL-AUTHENTICATION: domain : email.i ; SPF_822_from = X-Mailer: Unknown (No Version) On Saturday 14 June 2008 17:56, hajo.brandt.dj1zb@t-online.de wrote: > According to my experiments on untuned (and broadband) receiving aerials > for MF SKYWAVE RECEPTION in eastern Bavaria I have got the impression > that a (capacitive) MF aerial should be as high as possible (not > regarding loop aerials, they may be located close to the ground, for > them the loop area only counts). > If your antenna is an active one, like mini-whip, I agree. You can find some info about "height gain" in this paper, page 7: SCHWARZBECK MESS - ELEKTRONIK, "Calibration of Vertical Monopole Antennas (9kHz - 30 MHz)" I've lost the WEB link but you can find the paper using Google. This paper also have some useful hints about short and active antennas: Christof Rohner, "Antenna Basics", Rohde&Schwarz, 1999 You can find the paper into the Rohde&Schwarz WEB site. 73 de Claudio, ik2pii -- Claudio Pozzi - Happy Linux User - http://www.qsl.net/ik2pii -- Email.it, the professional e-mail, gratis per te: http://www.email.it/f Sponsor: CheBanca! La prima banca che ti dgli interessi in anticipo. * Fino al 4,70% sul Conto Deposito, zero spese e interessi subito. Aprilo! Clicca qui: http://adv.email.it/cgi-bin/foclick.cgi?mid=7916&d=16-6