Return-Path: <owner-rsgb_lf_group@blacksheep.org> Received: from mtain-da10.r1000.mx.aol.com (mtain-da10.r1000.mx.aol.com [172.29.64.82]) by air-dd02.mail.aol.com (v129.4) with ESMTP id MAILINDD021-86084c1e124b15e; Sun, 20 Jun 2010 09:06:19 -0400 Received: from post.thorcom.com (post.thorcom.com [193.82.116.20]) by mtain-da10.r1000.mx.aol.com (Internet Inbound) with ESMTP id 76D35380000B1; Sun, 20 Jun 2010 09:06:16 -0400 (EDT) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1OQKDB-0006ZR-2C for rs_out_1@blacksheep.org; Sun, 20 Jun 2010 14:05:21 +0100 Received: from [193.82.116.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1OQKDA-0006ZB-8M for rsgb_lf_group@blacksheep.org; Sun, 20 Jun 2010 14:05:20 +0100 Received: from relay01a.mail.uk1.eechost.net ([217.69.40.75] helo=relay03.mail.uk1.eechost.net) by relay1.thorcom.net with esmtp (Exim 4.63) (envelope-from <ei8jk@o2.ie>) id 1OQKD8-0004v0-HE for rsgb_lf_group@blacksheep.org; Sun, 20 Jun 2010 14:05:20 +0100 Received: from [88.151.27.236] (helo=TonyLaptop) by relay03.mail.uk1.eechost.net with esmtpa (Exim 4.68) (envelope-from <ei8jk@o2.ie>) id 1OQKCq-00005S-5d for rsgb_lf_group@blacksheep.org; Sun, 20 Jun 2010 14:05:00 +0100 Message-ID: <AD7CEF15D1E14338854A347049ECFADD@TonyLaptop> From: "Tony Baldwin" <ei8jk@o2.ie> To: <rsgb_lf_group@blacksheep.org> Date: Sun, 20 Jun 2010 14:04:56 +0100 MIME-Version: 1.0 X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Windows Mail 6.0.6002.18197 X-MIMEOLE: Produced By Microsoft MimeOLE V6.0.6002.18197 X-Auth-Info: 3810@permanet.ie (login) X-Spam-Score: 0.0 (/) X-Spam-Report: autolearn=disabled,HTML_MESSAGE=0.001 Subject: LF: Earth loop Content-Type: multipart/alternative; boundary="----=_NextPart_000_009B_01CB1081.902EE890" X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: X-Spam-Status: No, hits=0.9 required=5.0 tests=HTML_30_40,HTML_MESSAGE, MISSING_OUTLOOK_NAME 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: 3039ac1d40524c1e12486c29 X-AOL-IP: 193.82.116.20 ------=_NextPart_000_009B_01CB1081.902EE890 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable I have also been experimenting with this sort of antenna on receive. Mine is wire about 80m long and follows the hedge boundary draped over= bushes about a metre above ground level and terminated with an earth= rod. Most of the way it follows underneath an overhead power 240v lin= e that goes from a transformer to my neighbours property. I did this= on purpose just to see what would happen and to see if it coupled its= elf onto the mains wiring about 9m above. I was monitoring the 500 KHz WSPR activity on Friday evening on my ful= l size G5RV with the feeder strapped and was getting ... 2010-06-18 21:42 G4JNT 0.503882 -22 0 IO90iv 0.2 2010-06-18 21:36 G4JNT 0.503882 -22 0 IO90iv 0.2 I changed over to the earth loop/short beverage plus the main station= earth and immediately the QRM went way down and up pops PA0A along wi= th G4JNT at the same strength. 2010-06-18 22:06 G4JNT 0.503882 -22 0 IO90iv 0.2 =20 2010-06-18 22:04 PA0A 0.503907 -17 0 JO33de 5 =20 So it seems that something is working well here although I'm not sure= what. Later today or tomorrow when I get time, I will lay out another wire= at 90 degrees to the other one and also 90 degrees away from the over= head lines. It will be interesting to switch between the 3 antennas af= ter sunset and see what happens. The existing wire is roughly ne/sw and the new one will be almost exac= tly north/south. The reduction of the QRM was very noticeable and somewhere in the orde= r of 6 'S' points, but only on skywave QRM as I also tested the system= out during the day on a Spanish MW station on 551 KHz and both antenn= as seem to be very similar in both signal strength and noise. Fun isn't it. 73 de Tony, EI8JK, IO51dn. ------=_NextPart_000_009B_01CB1081.902EE890 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"> <HTML><HEAD> <META content=3D"text/html; charset=3Diso-8859-1" http-equiv=3DContent= -Type> <META name=3DGENERATOR content=3D"MSHTML 8.00.6001.18928"> <STYLE></STYLE> </HEAD> <BODY bgColor=3D#ffffff> <DIV><FONT size=3D2 face=3DArial>I have also been experimenting with= this sort of=20 antenna on receive.</FONT></DIV> <DIV><FONT size=3D2 face=3DArial>Mine is wire about 80m long and follo= ws the hedge=20 boundary draped over bushes about a metre above ground level and termi= nated with=20 an earth rod. Most of the way it follows underneath an overhead power= 240v line=20 that goes from a transformer to my neighbours property. I did thi= s on=20 purpose just to see what would happen and to see if it coupled itself= onto the=20 mains wiring about 9m above.</FONT></DIV> <DIV><FONT size=3D2 face=3DArial></FONT> </DIV> <DIV><FONT size=3D2 face=3DArial>I was monitoring the 500 KHz WSPR act= ivity on=20 Friday evening on my full size G5RV with the feeder strapped and was= getting=20 ...</FONT></DIV> <DIV><FONT size=3D2 face=3DArial></FONT> </DIV> <DIV><TR><TD align=3D"right">2010-06-18 21:42 </TD><TD align=3D= "left"> G4JNT </TD><TD align=3D"right"> 0.503882 = ;</TD><TD align=3D"right"> -22 </TD><TD align=3D"right">&n= bsp;0 </TD><TD align=3D"left"> IO90iv 0.2</DIV> <DIV></TD></TR><TR><TD align=3D"right">2010-06-18 21:36 </TD><TD= align=3D"left"> G4JNT </TD><TD align=3D"right"> 0.= 503882 </TD><TD align=3D"right"> -22 </TD><TD align= =3D"right"> 0 </TD><TD align=3D"left"> IO90iv 0.2= </DIV> <DIV><FONT size=3D2 face=3DArial></FONT> </DIV> <DIV><FONT size=3D2 face=3DArial>I changed over to the earth loop/shor= t beverage=20 plus the main station earth and immediately the QRM went way down and= up pops=20 PA0A along with G4JNT at the same strength.</FONT></DIV> <DIV><FONT size=3D2 face=3DArial></FONT> </DIV> <DIV><TR><TD align=3D"right">2010-06-18 22:06 </TD><TD align=3D= "left"> G4JNT </TD><TD align=3D"right"> 0.503882 = ;</TD><TD align=3D"right"> -22 </TD><TD align=3D"right">&n= bsp;0 </TD><TD align=3D"left"> IO90iv </TD><TD align= =3D"right"> 0.2 </TD><TD align=3D"left"> </DIV> <DIV>2010-06-18 22:04 </TD><TD align=3D"left"> PA0A </T= D><TD align=3D"right"> 0.503907 </TD><TD align=3D"right">&= nbsp;-17 </TD><TD align=3D"right"> 0 </TD><TD align= =3D"left"> JO33de </TD><TD align=3D"right"> 5 </= TD><TD align=3D"left"> </DIV> <DIV> </DIV> <DIV><FONT size=3D2 face=3DArial>So it seems that something is working= well here=20 although I'm not sure what.</FONT></DIV> <DIV><FONT size=3D2 face=3DArial>Later today or tomorrow when I get ti= me, I will lay=20 out another wire at 90 degrees to the other one and also 90 degrees aw= ay from=20 the overhead lines. It will be interesting to switch between the 3 ant= ennas=20 after sunset and see what happens.</FONT></DIV> <DIV><FONT size=3D2 face=3DArial>The existing wire is roughly ne/sw an= d the new one=20 will be almost exactly north/south.</FONT></DIV> <DIV><FONT size=3D2 face=3DArial></FONT> </DIV> <DIV><FONT size=3D2 face=3DArial>The reduction of the QRM was very not= iceable and=20 somewhere in the order of 6 'S' points, but only on skywave QRM as I= also tested=20 the system out during the day on a Spanish MW station on 551 KHz and= both=20 antennas seem to be very similar in both signal strength and noise.</F= ONT></DIV> <DIV><FONT size=3D2 face=3DArial></FONT> </DIV> <DIV><FONT size=3D2 face=3DArial>Fun isn't it.</FONT></DIV> <DIV><FONT size=3D2 face=3DArial></FONT> </DIV> <DIV><FONT size=3D2 face=3DArial>73 de Tony, EI8JK, IO51dn.</FONT></DI= V> <DIV><FONT size=3D2 face=3DArial></FONT> </DIV></BODY></HTML> ------=_NextPart_000_009B_01CB1081.902EE890--