Return-Path: Received: from mtain-dg03.r1000.mx.aol.com (mtain-dg03.r1000.mx.aol.com [172.29.65.11]) by air-df04.mail.aol.com (v129.4) with ESMTP id MAILINDF043-5ef04bfefab6158; Thu, 27 May 2010 19:05:26 -0400 Received: from post.thorcom.com (post.thorcom.com [193.82.116.20]) by mtain-dg03.r1000.mx.aol.com (Internet Inbound) with ESMTP id C8B59380000F0; Thu, 27 May 2010 19:05:24 -0400 (EDT) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1OHm7x-00089X-ML for rs_out_1@blacksheep.org; Fri, 28 May 2010 00:04:37 +0100 Received: from [193.82.116.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1OHm7x-00089O-8l for rsgb_lf_group@blacksheep.org; Fri, 28 May 2010 00:04:37 +0100 Received: from lnx503.hrz.tu-darmstadt.de ([130.83.156.232]) by relay1.thorcom.net with esmtp (Exim 4.63) (envelope-from ) id 1OHm7t-0001a3-FN for rsgb_lf_group@blacksheep.org; Fri, 28 May 2010 00:04:37 +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 o4RN4Wmp011074 for ; Fri, 28 May 2010 01:04:32 +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, 28 May 2010 01:04:31 +0200 Content-class: urn:content-classes:message MIME-Version: 1.0 X-MimeOLE: Produced By Microsoft Exchange V6.5 Date: Fri, 28 May 2010 01:02:37 +0200 Message-ID: <38A51B74B884D74083D7950AD0DD85E82A1C0C@File-Server-HST.hst.e-technik.tu-darmstadt.de> X-MS-Has-Attach: X-MS-TNEF-Correlator: <38A51B74B884D74083D7950AD0DD85E82A1C0C@File-Server-HST.hst.e-technik.tu-darmstadt.de> Thread-Topic: 0.5km with 1kHz 4W earth mode this evening Thread-Index: Acr9yiSjpzRQdFiLRFudT2nuxbiTQQAJo6so References: From: =?iso-8859-1?Q?Stefan_Sch=E4fer?= To: X-AVK-Virus-Check: AVB 21.80;27.05.2010 X-PMX-TU: seen v0.99a by 5.5.9.395186, Antispam-Engine: 2.7.2.376379, Antispam-Data: 2010.5.27.225414 X-PMX-RELAY: mailout X-Spam-Score: 0.0 (/) X-Spam-Report: autolearn=disabled,none Content-Type: multipart/mixed; boundary="----_=_NextPart_001_01CAFDF0.F7252AD0" Subject: LF: AW: 0.5km with 1kHz 4W earth mode this evening 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: 5400.1158/59073 X-AOL-VSS-CODE: clean x-aol-sid: 3039ac1d410b4bfefab4081b X-AOL-IP: 193.82.116.20 X-Mailer: Unknown (No Version) ------_=_NextPart_001_01CAFDF0.F7252AD0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Sounds good Roger. You seem to be pretty motivated ;-)=20 I hope i can transmit tomorrow out of 1,8km. Will report you also ;-) =20 73, Stefan/DK7FC ________________________________ Von: owner-rsgb_lf_group@blacksheep.org im Auftrag von Roger Lapthorn Gesendet: Do 27.05.2010 20:18 An: rsgb_lf_group@blacksheep.org Betreff: LF: 0.5km with 1kHz 4W earth mode this evening Today I made some more slight improvements to my loop and audio receiver= and did a further walk test listening by ear. This time I managed to hear= the signal just at 0.5kms. At 0.4kms it was a very solid signal. This was= in the middle of a field well away from cables and pipe work. The TX is= still the TDA2003 with 4W into the 20m spaced electrodes. At 0.4km where= the signal was good still I tried placing the loop on the ground to see= what happened. The signal was about the same level as when orientating th= e loop for best signal when held vertically. At the limit of range the lim= iting factor was 50Hz mains hum. I will try another Sallen-Key HPF in circ= uit to take this down another 20-30dB, which should be enough. I've a friend with a long back garden (no pipes or cables well away from= the house) who is almost exactly 1km away from my QTH and he is in my bes= t direction. As soon as I can (grandchridren permitting) I may take my lap= top and set this up in his garden to look for the signal. I may also try= listening/looking on electrode pairs too from the same location.=20 There are so many things to try still but I just don't have enough time in= the next week. 73s Roger G3XBM --=20 http://g3xbm-qrp.blogspot.com/ http://www.g3xbm.co.uk =20 http://www.youtube.com/user/g3xbm G3XBM GQRP 1678 ISWL G11088 ------_=_NextPart_001_01CAFDF0.F7252AD0 Content-Type: application/ms-tnef; name="winmail.dat" Content-Transfer-Encoding: base64 eJ8+IiAXAQaQCAAEAAAAAAABAAEAAQeQBgAIAAAA5AQAAAAAAADoAAEIgAcAGAAAAElQTS5NaWNy b3NvZnQgTWFpbC5Ob3RlADEIAQ2ABAACAAAAAgACAAEEgAEALwAAAEFXOiAwLjVrbSB3aXRoIDFr SHogNFcgZWFydGggbW9kZSB0aGlzIGV2ZW5pbmcAPw8BBYADAA4AAADaBwUAHAABAAIAJQAFAC8B ASCAAwAOAAAA2gcFABwAAQAEAB8ABQArAQEJgAEAIQAAADQ5MDZGNUYzNEY3RUZCNEFBQjVFQjJF OUU1ODgxOTE5AGcHAQOQBgA0EQAAOAAAAAMANgAAAAAAQAA5AGIkUbPw/coBHgA9AAEAAAAFAAAA QVc6IAAAAAACAUcAAQAAADIAAABjPURFO2E9IDtwPUhTVDtsPUZJTEUtU0VSVkVSLUhTLTEwMDUy NzIzMDQzMVotNDY3AAAAHgBJAAEAAAAvAAAATEY6IDAuNWttIHdpdGggMWtIeiA0VyBlYXJ0aCBt 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