Return-Path: Received: from mtain-me04.r1000.mx.aol.com (mtain-me04.r1000.mx.aol.com [172.29.96.140]) by air-db08.mail.aol.com (v129.10) with ESMTP id MAILINDB082-86224dc2f58a265; Thu, 05 May 2011 15:07:54 -0400 Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by mtain-me04.r1000.mx.aol.com (Internet Inbound) with ESMTP id E2124380000EA; Thu, 5 May 2011 15:07:52 -0400 (EDT) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1QI3sW-0005xN-6h for rs_out_1@blacksheep.org; Thu, 05 May 2011 20:06:24 +0100 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1QI3sU-0005xE-RQ for rsgb_lf_group@blacksheep.org; Thu, 05 May 2011 20:06:22 +0100 Received: from relay.uni-heidelberg.de ([129.206.100.212]) by relay1.thorcom.net with esmtp (Exim 4.63) (envelope-from ) id 1QI3sS-0000HW-9r for rsgb_lf_group@blacksheep.org; Thu, 05 May 2011 20:06:22 +0100 Received: from ix.urz.uni-heidelberg.de (cyrus-portal.urz.uni-heidelberg.de [129.206.100.176]) by relay.uni-heidelberg.de (8.14.1/8.14.1) with ESMTP id p45J6JER006291 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=NO) for ; Thu, 5 May 2011 21:06:19 +0200 Received: from extmail.urz.uni-heidelberg.de (extmail.urz.uni-heidelberg.de [129.206.100.140]) by ix.urz.uni-heidelberg.de (8.13.8/8.13.8) with ESMTP id p45J6Ijx031306 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=NO) for ; Thu, 5 May 2011 21:06:19 +0200 Received: from [129.206.205.69] (vpn205-069.rzuser.uni-heidelberg.de [129.206.205.69]) by extmail.urz.uni-heidelberg.de (8.13.4/8.13.1) with ESMTP id p45J6GwF015067 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=NO) for ; Thu, 5 May 2011 21:06:18 +0200 Message-ID: <4DC2F535.3080907@iup.uni-heidelberg.de> Date: Thu, 05 May 2011 21:06:29 +0200 From: =?ISO-8859-1?Q?Stefan_Sch=E4fer?= User-Agent: Mozilla/5.0 (Windows; U; Windows NT 6.1; de; rv:1.9.1.11) Gecko/20100711 Thunderbird/3.0.6 MIME-Version: 1.0 To: rsgb_lf_group@blacksheep.org References: <4DC28736.5070405@talktalk.net> <8CDD93ACCC1EFE6-153C-39E0A@Webmail-d111.sysops.aol.com> <4DC2A264.5050606@talktalk.net> <822009.51309.qm@web111905.mail.gq1.yahoo.com> <4DC2A9C5.2050209@talktalk.net> <4DC2CAAD.70705@iup.uni-heidelberg.de> <8CDD95AD5252832-131C-136A6@webmail-d042.sysops.aol.com> <4DC2EACD.5090309@iup.uni-heidelberg.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: ELF: Zevs Content-Type: multipart/alternative; boundary="------------070904040608030107090702" X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: X-Spam-Status: No, hits=0.6 required=5.0 tests=HTML_20_30, HTML_FONTCOLOR_UNKNOWN,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: 3039ac1d608c4dc2f5880678 X-AOL-IP: 195.171.43.25 X-AOL-SPF: domain : blacksheep.org SPF : none X-Mailer: Unknown (No Version) --------------070904040608030107090702 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 p45J6JER006291 Hmm, well.... I've done some tests on 1970 Hz and haven't come very far.= =20 Just a poor signal in 5 km distance. But the QRM is very high there. I=20 think in your utilities assisted earth mode i will work some km. Would=20 be interesting about a QRO test ;-) I could use my LF TX antenna and=20 ground it at the far end, i would achieve a loop with 2700 m^2 but even=20 that wouldn't be enough to reach the next amateur station i think. To many projects in the moment, like building up the LF stn and=20 improving the RX and so on. But maybe i'll go back to 1970 Hz if i can=20 do some better local tests on the earth antenna... 73, Stefan PS: Sounds like i become old? No! ;-) Am 05.05.2011 20:29, schrieb Roger Lapthorn: > If you use your earth electrode antenna Stefan you will not need the=20 > coil. Try it and see how far it gets at this much lower frequency? > > 73s > Roger G3XBM > > 2011/5/5 Stefan Sch=E4fer > > > Markus, > > If you wind the coil, i'll try it! > > Ah, BTW, a simple mains transformer would do the job! Driven by > the H bridge and SL as the driver. Trivial ;-) > > 73, Stefan > > Am 05.05.2011 18:44, schrieb Markus Vester: >> >> Hi Stefan, >> that window looks like a challenge for your transmit earth >> antenna as well ;-) >> Best 73, >> Markus >> >> -----Urspr=FCngliche Mitteilung----- >> Von: Stefan Sch=E4fer >> >> An: rsgb_lf_group@blacksheep.org >> >> Verschickt: Do., 5. Mai. 2011, 18:05 >> Thema: Re: ELF: Zevs >> >> Hi Eddie, Daniele, ELF ;-) >> >> My temporarely window is running here >> http://www.iup.uni-heidelberg.de/schaefer_vlf/DK7FC_VLF_Grabber2.ht= ml >> Curious if i'll get a trace tomorrow morning... >> >> 73, Stefan > > > > > --=20 > http://g3xbm-qrp.blogspot.com/ > http://www.g3xbm.co.uk > http://www.youtube.com/user/g3xbm > https://sites.google.com/site/sub9khz/ > --------------070904040608030107090702 Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Hmm, well.... I've done some tests on 1970 Hz and haven't come very far. Just a poor signal in 5 km distance. But the QRM is very high there. I think in your utilities assisted earth mode i will work some km. Would be interesting about a QRO test ;-) I could use my LF TX antenna and ground it at the far end, i would achieve a loop with 2700 m^2 but even that wouldn't be enough to reach the next amateur station i think.
To many projects in the moment, like building up the LF stn and improving the RX and so on. But maybe i'll go back to 1970 Hz if i can do some better local tests on the earth antenna...

73, Stefan

PS: Sounds like i become old? No! ;-)

Am 05.05.2011 20:29, schrieb Roger Lapthorn:
If you use your earth electrode antenna Stefan you will not need the coil. Try it and see how far it gets at this much lower frequency?

73s
Roger G3XBM

2011/5/5 Stefan Schäfer <schaefer@iup.uni-heidelberg.de>
Markus,

If you wind the coil, i'll try it!

Ah, BTW, a simple mains transformer would do the job! Driven by the H bridge and SL as the driver. Trivial ;-)

73, Stefan

Am 05.05.2011 18:44, schrieb Markus Vester:

Hi Stefan,
 
that window looks like a challenge for your transmit earth antenna as well ;-)
Best 73,
Markus

-----Ursprüngliche Mitteilung-----
Von: Stefan Schäfer <Stefan.Schaefer@iup.uni-heidelberg.de>
An: rsgb_lf_group@blacksheep.org
Verschickt: Do., 5. Mai. 2011, 18:05
Thema: Re: ELF: Zevs

Hi Eddie, Daniele, ELF ;-)

My temporarely window is running here http://www.iup.uni-heidelberg.de/schaefer_vlf/DK7FC_VLF_Grabber2.html
Curious if i'll get a trace tomorrow morning...

73, Stefan
 



--
http://g3xbm-qrp.blogspot.com/
http://www.g3xbm.co.uk
http://www.youtube.com/user/g3xbm
https://sites.google.com/site/sub9khz/

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