Return-Path: Received: from mtain-mb01.r1000.mx.aol.com (mtain-mb01.r1000.mx.aol.com [172.29.96.21]) by air-ma10.mail.aol.com (v129.4) with ESMTP id MAILINMA103-b5424c1aa9fa8b; Thu, 17 Jun 2010 19:04:26 -0400 Received: from post.thorcom.com (post.thorcom.com [193.82.116.20]) by mtain-mb01.r1000.mx.aol.com (Internet Inbound) with ESMTP id 19F4E380001F4; Thu, 17 Jun 2010 19:04:24 -0400 (EDT) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1OPO6h-0000Ex-R8 for rs_out_1@blacksheep.org; Fri, 18 Jun 2010 00:02:47 +0100 Received: from [193.82.116.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1OPO6f-0000DJ-Gr for rsgb_lf_group@blacksheep.org; Fri, 18 Jun 2010 00:02:45 +0100 Received: from lnx503.hrz.tu-darmstadt.de ([130.83.156.232]) by relay1.thorcom.net with esmtp (Exim 4.63) (envelope-from ) id 1OPO6c-00048N-7E for rsgb_lf_group@blacksheep.org; Fri, 18 Jun 2010 00:02:45 +0100 Received: from FILE-SERVER-HST.hst.e-technik.tu-darmstadt.de (File-Server-HST.hst.e-technik.tu-darmstadt.de [130.83.212.129]) by lnx503.hrz.tu-darmstadt.de (8.14.4/8.14.4/HRZ/PMX) with SMTP id o5HN2enE018114 for ; Fri, 18 Jun 2010 01:02:40 +0200 (envelope-from schaefer@hst.tu-darmstadt.de) Received: from [127.0.0.1] (helo=File-Server-HST.hst.e-technik.tu-darmstadt.de) by FILE-SERVER-HST.hst.e-technik.tu-darmstadt.de with AVK MailGateway; for ; Fri, 18 Jun 2010 01:02:40 +0200 Content-class: urn:content-classes:message MIME-Version: 1.0 X-MimeOLE: Produced By Microsoft Exchange V6.5 Date: Fri, 18 Jun 2010 01:02:39 +0200 Message-ID: <38A51B74B884D74083D7950AD0DD85E82A1C51@File-Server-HST.hst.e-technik.tu-darmstadt.de> X-MS-Has-Attach: X-MS-TNEF-Correlator: <38A51B74B884D74083D7950AD0DD85E82A1C51@File-Server-HST.hst.e-technik.tu-darmstadt.de> Thread-Topic: First try for 5km with an earth antenna on <9 / Dreamers BandT Thread-Index: AcsOZhoYeApvmUZ3S4WuOI8QH3ObIQABV+J8 References: From: =?iso-8859-1?Q?Stefan_Sch=E4fer?= To: X-AVK-Virus-Check: AVB 21.129;17.06.2010 X-PMX-TU: seen v0.99a by 5.5.9.395186, Antispam-Engine: 2.7.2.376379, Antispam-Data: 2010.6.17.225115 X-PMX-RELAY: mailout X-Spam-Score: 0.0 (/) X-Spam-Report: autolearn=disabled,none Content-Type: multipart/mixed; boundary="----_=_NextPart_001_01CB0E71.2F61D104" Subject: VLF: First try for 5km with an earth antenna on <9 / Dreamers BandT 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-VSS-INFO: 5400.1158/59896 X-AOL-VSS-CODE: clean x-aol-sid: 3039ac1d60154c1aa9f8340f X-AOL-IP: 193.82.116.20 X-Mailer: Unknown (No Version) ------_=_NextPart_001_01CB0E71.2F61D104 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Dear VLF, Today i tried a first attempt to transmit a 8,97 kHz Signal over a distanc= e of 5km, using an earth antenna. The antenna was, for a first step at the new QTH, the 120m long wire that= i used in the successful 2km distance reception. TX power was abt 50W, so= 10 dB more than in the 2km test. But there was no reception :-(=20 One reason is the very strong QRM that makes not even a break for some hou= rs in the morning within the last 3 days.=20 Another reason was the TX time: 16:40 UTC.=20 A third reason is the high earth resistance: 3 kOhm! So i got about 135 mA= @ 400V! Maybe this is due to a bad earth connection (negative) but it cou= ld be also due to the bad soil conductivity there on that hill, 520m ASL(p= ositive!) The earth rods were 3 copper rods on each side, 10mm diameter and just 40c= m long, 1m spaced. There are stones that makes it impossible to run a 2m= rod into the bottom so i decided to use many small rods. Those are availa= ble out of the trash of my work so i will take MANY of them in the next te= sts ;-)=20 I will check what happens to the earth resistance if i double the earth ro= ds (well spaced to each other) on each pole. If the losses gets the half= by taking twice the earth rods, the losses are mainly caused by the bad= earth connection. If almost nothing happens, the losses are mainly caused= by the soil conductivity... Furthermore i will increase the wire length to up to 1000m. But first i wa= nt to see a signal on my grabber with a minimal effort. Maybe this kind of= antenna will be suitable for DX if the dimensions and earth conditions ar= e suitable.=20 A first test with receiving on this antenna was disappointing: I received= the strong MSK military VLF transmitters well but the S/N of my grabber= (out of the center of the city) is at least 20 dB better. Maybe there is= an influence of that old notebook so i will repeat this RX test with my= new netbook that has a very good internal soundcard! (providing 96 ks/s= and -120dB noise and 8 hours accu load). The test was done by directly co= nnecting the wires to the audio input. Maybe a isolating transformaer is= a better choise here, giving something like a wide bandpass (DC, ELF, LF= rejection). The antenna will be fixed at this place. If it will be a very successful= arrangement in some days/weeks and you are in holidays here you may use= it for a nice /p QSO ;-) Will see how it works on 137 but currently it's a little strange for me to= use such high frequencies ;-) =20 Wish you fun and good luck with all your tests and preparing for the comin= g period!!! :-) 73, Stefan/DK7FC ------_=_NextPart_001_01CB0E71.2F61D104 Content-Type: application/ms-tnef; name="winmail.dat" Content-Transfer-Encoding: base64 eJ8+IikXAQaQCAAEAAAAAAABAAEAAQeQBgAIAAAA5AQAAAAAAADoAAEIgAcAGAAAAElQTS5NaWNy b3NvZnQgTWFpbC5Ob3RlADEIAQ2ABAACAAAAAgACAAEEgAEARAAAAFZMRjogRmlyc3QgdHJ5IGZv ciA1a20gd2l0aCBhbiBlYXJ0aCBhbnRlbm5hIG9uIDw5IC8gRHJlYW1lcnMgQmFuZJkAwxYBBYAD AA4AAADaBwYAEgABAAIAJwAFACgBASCAAwAOAAAA2gcGABIAAQACACgABQApAQEJgAEAIQAAAEU0 RjNGNDEzNzAzNTc5NDRBNDhGQkIwMTdFNjM4RDc1ABwHAQOQBgBYEQAAOAAAAAMANgAAAAAAQAA5 AATRYS9xDssBHgA9AAEAAAAGAAAAVkxGOiAAAAACAUcAAQAAADIAAABjPURFO2E9IDtwPUhTVDts 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