Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by mtain-mk05.r1000.mx.aol.com (Internet Inbound) with ESMTP id 177B438000142; Wed, 12 Oct 2011 05:11:47 -0400 (EDT) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1RDuqD-0000u5-JO for rs_out_1@blacksheep.org; Wed, 12 Oct 2011 10:11:09 +0100 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1RDuqD-0000tw-75 for rsgb_lf_group@blacksheep.org; Wed, 12 Oct 2011 10:11:09 +0100 Received: from relay.uni-heidelberg.de ([129.206.100.212]) by relay1.thorcom.net with esmtp (Exim 4.63) (envelope-from ) id 1RDuqB-0004WA-S9 for rsgb_lf_group@blacksheep.org; Wed, 12 Oct 2011 10:11:09 +0100 Received: from freitag.iup.uni-heidelberg.de (freitag.iup.uni-heidelberg.de [129.206.29.204]) by relay.uni-heidelberg.de (8.14.1/8.14.1) with ESMTP id p9C9B6qV031431 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=NO) for ; Wed, 12 Oct 2011 11:11:07 +0200 Received: from [129.206.22.206] (pc206.iup.uni-heidelberg.de [129.206.22.206]) by freitag.iup.uni-heidelberg.de (8.12.11.20060308/8.11.2) with ESMTP id p9C9B6fd019766 for ; Wed, 12 Oct 2011 11:11:06 +0200 Message-ID: <4E95597C.6080404@iup.uni-heidelberg.de> Date: Wed, 12 Oct 2011 11:10:20 +0200 From: =?ISO-8859-1?Q?Stefan_Sch=E4fer?= User-Agent: Mozilla/5.0 (Windows; U; Windows NT 6.1; de; rv:1.9.1.8) Gecko/20100227 Thunderbird/3.0.3 MIME-Version: 1.0 To: rsgb_lf_group@blacksheep.org References: <4E91694C.8060900@orange.fr> <4E9169AD.8090609@wanadoo.fr> <4E918C0E.30401@freenet.de> <4E918FF1.1010407@iup.uni-heidelberg.de> <1318166502.15085.YahooMailNeo@web28106.mail.ukl.yahoo.com> <1849736542-1318171189-cardhu_decombobulator_blackberry.rim.net-208700020-@b1.c11.bise7.blackberry> <4E920BBA.9040200@iup.uni-heidelberg.de> <4E934A40.9040204@gmx.de> <006c01cc87ab$427234c0$4001a8c0@lark> <834DCCD1D3834F4CB4C171B7C30E85B4@AGB> <004801cc8809$63378d50$4001a8c0@lark> In-Reply-To: X-Spam-Score: 1.4 (+) X-Spam-Report: autolearn=disabled,RATWARE_GECKO_BUILD=1.426 Subject: Re: LF: VO1NA 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 x-aol-global-disposition: G X-AOL-SCOLL-SCORE: 0:2:486355424:93952408 X-AOL-SCOLL-URL_COUNT: 0 x-aol-sid: 3039ac1d61894e9559d324d9 X-AOL-IP: 195.171.43.25 X-AOL-SPF: domain : blacksheep.org SPF : none Hello Joe, Wow, GN37, nice place! I think there is wind sometimes? ;-) Ever thought about a kite experiment? :-) Question: When will you be back on 137? I remember receiving you well in QRSS-10 so i think its time for our QSO. What do you think? 73, Stefan/DK7FC Am 12.10.2011 01:05, schrieb jcraig@mun.ca: > Dear Group, > > I'd like to thank all those who sent their ideas. DK7FC suggested > shunting the LF tuning coil with a series resonant LC, but ON7YD > said it could affect bandwidth on 160m. Stefan wondered where > the 50 kV was coming from. That was an upper limit guess based > on modelling a short monopole. 1000 watts at 50 ohms is 4.47 amps. > Feeding this into 3 mH (X=2500 ohm at 137.8 kHz) gives 11.2 kV (17 kV > peak) so relays in series as suggested by G8FZK and G3NYK should work > well. Alan's idea of 'mechanical amplification' had cross my mind too! > > I'm puzzled by the 6pf/metre rule for monoploes. It seems the > capacitance > of the monopole is much higher. Perhaps I've erred again! Please feel > free to critique my silly calculations above. > > The 8 WPM beacon is running on 507.77 kHz now with 80 watts to a vertical > located at GN37. > > 73 and thanks > Joe > > > This electronic communication is governed by the terms and conditions at > http://www.mun.ca/cc/policies/electronic_communications_disclaimer_2011.php >