Return-Path: Received: from mtain-ma08.r1000.mx.aol.com (mtain-ma08.r1000.mx.aol.com [172.29.96.16]) by air-mb02.mail.aol.com (v128.1) with ESMTP id MAILINMB022-a1904bc472c8db; Tue, 13 Apr 2010 09:34:00 -0400 Received: from post.thorcom.com (post.thorcom.com [193.82.116.20]) by mtain-ma08.r1000.mx.aol.com (Internet Inbound) with ESMTP id 82464380000B0; Tue, 13 Apr 2010 09:33:58 -0400 (EDT) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1O1gEJ-0002bx-Gi for rs_out_1@blacksheep.org; Tue, 13 Apr 2010 14:32:39 +0100 Received: from [193.82.116.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1O1gEI-0002aZ-LU for rsgb_lf_group@blacksheep.org; Tue, 13 Apr 2010 14:32:38 +0100 Received: from relay.uni-heidelberg.de ([129.206.100.212]) by relay1.thorcom.net with esmtp (Exim 4.63) (envelope-from ) id 1O1gEG-0008A7-SK for rsgb_lf_group@blacksheep.org; Tue, 13 Apr 2010 14:32:38 +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 o3DDWRsa022258 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=NO) for ; Tue, 13 Apr 2010 15:32:27 +0200 Received: from [129.206.29.99] (pc99.iup.uni-heidelberg.de [129.206.29.99]) by freitag.iup.uni-heidelberg.de (8.12.11.20060308/8.11.2) with ESMTP id o3DDWZGM014925 for ; Tue, 13 Apr 2010 15:32:35 +0200 Message-ID: <4BC472EF.4050100@iup.uni-heidelberg.de> Date: Tue, 13 Apr 2010 15:34:39 +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: <4BC1E717.21514.149803B@mike.dennison.ntlworld.com> <38A51B74B884D74083D7950AD0DD85E82A1BDC@File-Server-HST.hst.e-technik.tu-darmstadt.de>,<38A51B74B884D74083D7950AD0DD85E82A1BDD@File-Server-HST.hst.e-technik.tu-darmstadt.de> In-Reply-To: X-Spam-Score: 1.4 (+) X-Spam-Report: autolearn=disabled,HTML_MESSAGE=0.001,RATWARE_GECKO_BUILD=1.426 Subject: Re: LF: RE: VLF QRM free window becomes smaller? Content-Type: multipart/alternative; boundary="------------030102010609000503070804" X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: X-Spam-Status: No, hits=0.8 required=5.0 tests=HTML_30_40,HTML_MESSAGE 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-sid: 3039ac1d60104bc472c66563 X-AOL-IP: 193.82.116.20 X-Mailer: Unknown (No Version) --------------030102010609000503070804 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: quoted-printable X-MIME-Autoconverted: from 8bit to quoted-printable by relay.uni-heidelberg.de id o3DDWRsa022258 Rik, Yes, maybe. But hopefully not at this weekend! ;-) 73, Stefan/DK7FC Am 13.04.2010 14:16, schrieb Rik Strobbe: > Stefan, > maybe thunderstorms coming up in the afternoon ? > 73, Rik ON7YD > ------------------------------------------------------------------------ > *Van:* owner-rsgb_lf_group@blacksheep.org=20 > [owner-rsgb_lf_group@blacksheep.org] namens Stefan Sch=E4fer=20 > [schaefer@hst.tu-darmstadt.de] > *Verzonden:* zondag 11 april 2010 20:19 > *Aan:* rsgb_lf_group@blacksheep.org > *Onderwerp:* VLF: VLF QRM free window becomes smaller? > > Dear LF, > > Taking a look on Markus' VLF grabber, it seems, the time window with a= =20 > minimum QRN becomes smaller in the last weeks(see the picture). Has=20 > anyone experience (Paul?) if this is a daily accident or a tendency=20 > when going to the summer? What will be in one month? > > BTW, my 600W PA almost works; the amperemeter (1A full range) is now=20 > inserted into the coil and is calibrated; i built up a narrow band=20 > active E field antenna for the dreamers band (2x BF862, 2 band pass=20 > filters, BW abt 500Hz, preamp noise 20dB above soundcard noise, preamp= =20 > + VLF noise 40dB above soundcard noise, decoupling AF transformer)=20 > that will give my new VLF grabber in Heidelberg :-) > > Things are going on and new records will have to be done :-) > > Best 73, Stefan/DK7FC > --------------030102010609000503070804 Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Rik,

Yes, maybe. But hopefully not at this weekend! ;-)

73, Stefan/DK7FC


Am 13.04.2010 14:16, schrieb Rik Strobbe:
Stefan,
 
maybe thunderstorms coming up in the afternoon ?
 
73, Rik  ON7YD
 
Van: owner-rsgb_lf_group@blacksheep.org [owner-rsgb_lf_group@blacksheep.org] namens Stefan Schäfer [schaefer@hst.tu-darmstadt.de]
Verzonden: zondag 11 april 2010 20:19
Aan: rsgb_lf_group@blacksheep.org
Onderwerp: VLF: VLF QRM free window becomes smaller?

Dear LF,

Taking a look on Markus' VLF grabber, it seems, the time window with a minimum QRN becomes smaller in the last weeks(see the picture). Has anyone experience (Paul?) if this is a daily accident or a tendency when going to the summer? What will be in one month?

BTW, my 600W PA almost works; the amperemeter (1A full range) is now inserted into the coil and is calibrated; i built up a narrow band active E field antenna for the dreamers band (2x BF862, 2 band pass filters, BW abt 500Hz, preamp noise 20dB above soundcard noise, preamp + VLF noise 40dB above soundcard noise, decoupling AF transformer) that will give my new VLF grabber in Heidelberg :-)

Things are going on and new records will have to be done :-)

Best 73, Stefan/DK7FC

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