Return-Path: Received: from mtain-dc09.r1000.mx.aol.com (mtain-dc09.r1000.mx.aol.com [172.29.64.137]) by air-mf09.mail.aol.com (v129.4) with ESMTP id MAILINMF091-8bf94c2453e524f; Fri, 25 Jun 2010 02:59:49 -0400 Received: from post.thorcom.com (post.thorcom.com [193.82.116.20]) by mtain-dc09.r1000.mx.aol.com (Internet Inbound) with ESMTP id 74C8D380000F8; Fri, 25 Jun 2010 02:59:42 -0400 (EDT) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1OS2rl-0007V5-GB for rs_out_1@blacksheep.org; Fri, 25 Jun 2010 07:58:21 +0100 Received: from [193.82.116.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1OS2rl-0007Uw-0k for rsgb_lf_group@blacksheep.org; Fri, 25 Jun 2010 07:58:21 +0100 Received: from cavuit02.kulnet.kuleuven.be ([134.58.240.44]) by relay1.thorcom.net with esmtp (Exim 4.63) (envelope-from ) id 1OS2rk-0005JX-2g for rsgb_lf_group@blacksheep.org; Fri, 25 Jun 2010 07:58:20 +0100 Received: from smtps01.kuleuven.be (smtpshost01.kulnet.kuleuven.be [134.58.240.74]) by cavuit02.kulnet.kuleuven.be (Postfix) with ESMTP id 4F3CD51C002 for ; Fri, 25 Jun 2010 08:58:12 +0200 (CEST) Received: from ICTS-S-HUB-N2.luna.kuleuven.be (icts-s-hub-n2.luna.kuleuven.be [10.112.9.12]) by smtps01.kuleuven.be (Postfix) with ESMTP id 37AFC31E703 for ; Fri, 25 Jun 2010 08:58:12 +0200 (CEST) Received: from ICTS-S-EXC2-CA.luna.kuleuven.be ([10.112.11.13]) by ICTS-S-HUB-N2.luna.kuleuven.be ([10.112.9.12]) with mapi; Fri, 25 Jun 2010 08:58:12 +0200 X-Kuleuven: This mail passed the K.U.Leuven mailcluster From: Rik Strobbe To: "rsgb_lf_group@blacksheep.org" Date: Fri, 25 Jun 2010 08:58:12 +0200 Thread-Topic: 5,2 km distance on 8,97 kHz with an earth antenna Thread-Index: AcsUAF98vr1L5xr8TRCjEqkWAdFXQgAMjR70 Message-ID: References: ,,, ,<4C23FC42.8040204@iup.uni-heidelberg.de> In-Reply-To: <4C23FC42.8040204@iup.uni-heidelberg.de> Accept-Language: nl-NL, nl-BE Content-Language: nl-BE X-MS-Has-Attach: X-MS-TNEF-Correlator: acceptlanguage: nl-NL, nl-BE MIME-Version: 1.0 X-KULeuven-Information: Katholieke Universiteit Leuven X-KULeuven-Scanned: Found to be clean X-KULeuven-Envelope-From: rik.strobbe@fys.kuleuven.be X-Spam-Score: 0.0 (/) X-Spam-Report: autolearn=disabled,HTML_MESSAGE=0.001 Subject: LF: RE: 5,2 km distance on 8,97 kHz with an earth antenna Content-Type: multipart/alternative; boundary="_000_BF4A524700075746A6467658DFC7102C51094D0DC8ICTSSEXC2CAlu_" 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_BLUE, HTML_MESSAGE,TO_ADDRESS_EQ_REAL 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: 3039ac1d40894c2453de0680 X-AOL-IP: 193.82.116.20 X-Mailer: Unknown (No Version) --_000_BF4A524700075746A6467658DFC7102C51094D0DC8ICTSSEXC2CAlu_ Content-Type: text/plain; charset="Windows-1252" Content-Transfer-Encoding: quoted-printable Hello Stefan, thank you for the very interesting report. "This brought me to the idea that if we are discussing ground loop antenna= s, the impedance of the antenna is not just resistive but it has an induct= ive component. And, the bigger the loop area, the higher the L and so ther= e should be a phase offset due to that reactive part!? I will try to measu= re that. Maybe it can give us informations about the depth of the back flo= wing current=85" Indeed it would. At 9kHz it should be possible to do that using the notebo= ok (headphone output as "signal generator", the 2 stereo inputs to measure= voltage and phase at the antenna. 73, Rik ON7YD ________________________________ Van: owner-rsgb_lf_group@blacksheep.org [owner-rsgb_lf_group@blacksheep.or= g] namens Stefan Sch=E4fer [Stefan.Schaefer@iup.uni-heidelberg.de] Verzonden: vrijdag 25 juni 2010 2:45 Aan: rsgb_lf_group@blacksheep.org Onderwerp: VLF: 5,2 km distance on 8,97 kHz with an earth antenna Dear LF/VLF, Today i spent more than 8 hours in the forest on a hill 520m ASL, improvin= g and experimenting with my VLF earth antenna. It was a fantastic and very= successful day that gave a lot of fun and motivation. BTW, just spending= time in this wonderful nature with all its beauty cannot be wasted time= even if all the experiments would fail :-)))) That is what i thought many= times this day. If you live in a city with much noise (on the band and au= dible) you may understand what i mean when i say that all you can hear the= re is the wind and some birds! Since there are a lot of photos and things to tell i set up a pdf document= with my report that is available at http://www.iup.uni-heidelberg.de/scha= efer_vlf/VLF_5km_with_an_earth_antenna.pdf , for the VLF enthusiasts (Drea= mers!) and those who want to become one! :-) Best 73, Stefan/DK7FC --_000_BF4A524700075746A6467658DFC7102C51094D0DC8ICTSSEXC2CAlu_ Content-Type: text/html; charset="Windows-1252" Content-Transfer-Encoding: quoted-printable
Hello Stefan,
 
thank you for the very interest= ing report.
 
"Th= is brought me to the idea that if we are discussing ground loop antennas,= the impedance of the antenna is not just resistive but it has an inductiv= e component. And, the bigger the loop area, the higher the L and so there should be a phase offset due to that reactive= part!? I will try to measure that. Maybe it can give us informations abou= t the depth of the back flowing current=85"
Indeed it would. At 9kHz it should= be possible to do that using the notebook (headphone output as "sign= al generator", the 2 stereo inputs to measure voltage and phase at th= e antenna.
 
73, Rik  ON7YD
Van: owner-rsgb_= lf_group@blacksheep.org [owner-rsgb_lf_group@blacksheep.org] namens Stefan= Sch=E4fer [Stefan.Schaefer@iup.uni-heidelberg.de]
Verzonden: vrijdag 25 juni 2010 2:45
Aan: rsgb_lf_group@blacksheep.org
Onderwerp: VLF: 5,2 km distance on 8,97 kHz with an earth antenna
Dear LF/VLF,

Today i spent more than 8 hours in the forest on a hill 520m ASL, improvin= g and experimenting with my VLF earth antenna. It was a fantastic and very= successful day that gave a lot of fun and motivation. BTW, just spending= time in this wonderful nature with all its beauty cannot be wasted time even if all the experiments would fa= il :-)))) That is what i thought many times this day. If you live in a cit= y with much noise (on the band and audible) you may understand what i mean= when i say that all you can hear there is the wind and some birds!

Since there are a lot of photos and things to tell i set up a pdf document= with my report that is available at http://www.iup.uni-heidelberg.de/schaefer_vlf/VLF_5km_with_an_earth_antenn= a.pdf , for the VLF enthusiasts (Dreamers!) and those who want to become one= ! :-)

Best  73, Stefan/DK7FC
--_000_BF4A524700075746A6467658DFC7102C51094D0DC8ICTSSEXC2CAlu_--