Return-Path: Received: from mtain-dd04.r1000.mx.aol.com (mtain-dd04.r1000.mx.aol.com [172.29.64.144]) by air-de05.mail.aol.com (v129.10) with ESMTP id MAILINDE052-5eb34dbd97ad32e; Sun, 01 May 2011 13:26:05 -0400 Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by mtain-dd04.r1000.mx.aol.com (Internet Inbound) with ESMTP id 1611638000081; Sun, 1 May 2011 13:26:03 -0400 (EDT) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1QGaOY-00036m-N3 for rs_out_1@blacksheep.org; Sun, 01 May 2011 18:25:22 +0100 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1QGaOY-00036d-8h for rsgb_lf_group@blacksheep.org; Sun, 01 May 2011 18:25:22 +0100 Received: from out1.ip03ir2.opaltelecom.net ([62.24.128.239]) by relay1.thorcom.net with esmtp (Exim 4.63) (envelope-from ) id 1QGaOW-0003PW-Ih for rsgb_lf_group@blacksheep.org; Sun, 01 May 2011 18:25:22 +0100 X-IronPort-Anti-Spam-Filtered: true X-IronPort-Anti-Spam-Result: AqYCAFiWvU1cEYLb/2dsb2JhbACUCwOECD+CdopRd8IYhgAEgg2RIoNhhgw X-IronPort-AV: E=Sophos;i="4.64,298,1301871600"; d="scan'208,217";a="345458904" Received: from unknown (HELO xphd97xgq27nyf) ([92.17.130.219]) by out1.ip03ir2.opaltelecom.net with SMTP; 01 May 2011 18:25:13 +0100 Message-ID: <005b01cc0824$ba88e3c0$0401a8c0@xphd97xgq27nyf> From: "mal hamilton" To: References: Date: Sun, 1 May 2011 18:25:12 +0100 MIME-Version: 1.0 X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2600.0000 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2600.0000 X-Spam-Score: 0.0 (/) X-Spam-Report: autolearn=disabled,HTML_MESSAGE=0.001 Subject: LF: Re: 325km with the QRPp QRSS30 beacon Content-Type: multipart/alternative; boundary="----=_NextPart_000_0058_01CC082D.1C0CE760" X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: * X-Spam-Status: No, hits=1.1 required=5.0 tests=BE_AMAZED,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: 3039ac1d40904dbd97ab2cdc X-AOL-IP: 195.171.43.25 X-AOL-SPF: domain : blacksheep.org SPF : none ------=_NextPart_000_0058_01CC082D.1C0CE760 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable If it was not fully readable how did he know it was you ? g3kev ----- Original Message -----=20 From: Roger Lapthorn=20 To: rsgb_lf_group@blacksheep.org=20 Sent: Sunday, May 01, 2011 6:05 PM Subject: LF: 325km with the QRPp QRSS30 beacon "Because of the extremely low antenna efficiencies, 136kHz is not a= band for low power transmitters" - a quote from page 67 of "LF Today"= , the excellent book by G3XDV and M0BMU. Henny PA3CPM has sent me a screen shot taken this morning that shows= my signal reaching him in Holland. Just a few dB more would make quit= e a difference and make the signal fully readable. I am very grateful= to Henny (and others) for working so hard to find me. I continue to be amazed, and really pleased, that something this sim= ple (2.4W RF, 50uW ERP, QRPp beacon TX and a simple thin wire loop ant= enna) can be detected so far away, although I know others have done fa= r better. Of course, I accept it would not be possible without the si= gnal processing available to us on the RX end and the skill of those= like Henny winkling out the signal from the noise.=20 ....but maybe in the next edition of the book, the words should be= changed? :-)=20 73s Roger G3XBM --=20 http://g3xbm-qrp.blogspot.com/ http://www.g3xbm.co.uk http://www.youtube.com/user/g3xbm https://sites.google.com/site/sub9khz/ ------=_NextPart_000_0058_01CC082D.1C0CE760 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
If it was not fully readable how did he know= it was you=20 ?
g3kev
 
----- Original Message -----
Sent: Sunday, May 01, 2011 6:= 05 PM
Subject: LF: 325km with the= QRPp QRSS30=20 beacon

"Because of the extremely low= antenna=20 efficiencies, 136kHz is not a band for low power transmitters" - a= quote from=20 page 67 of "LF Today", the excellent book by G3XDV and=20 M0BMU.

Henny PA3CPM has sent me a screen shot= taken this=20 morning that shows my signal reaching him in Holland. Just a few dB= more would=20 make quite a difference and make the signal fully readable. I am ver= y grateful=20 to Henny (and others) for working so hard to find me.

I conti= nue to be=20 amazed, and really pleased, that something this simple (2.4W RF, 50u= W ERP,=20 QRPp beacon TX and a simple thin wire loop antenna) can be detected= so far=20 away, although I know others have done far better.  Of course,= I accept=20 it would not be possible without the signal processing available to= us on the=20 RX end and the skill of those like Henny winkling out the signal fro= m the=20 noise.

....but maybe in the next edition of the book, the wo= rds should=20 be changed? :-)

73s
Roger G3XBM


--=
http://g3xbm-qrp.blogspot.com/
http://www.g3xbm.co.uk
http://www.yout= ube.com/user/g3xbm
https://sites.google.com/site/sub9khz/<= /A>

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