Return-Path: X-Spam-DCC: paranoid 1290; Body=2 Fuz1=2 Fuz2=2 X-Spam-Checker-Version: SpamAssassin 3.1.3 (2006-06-01) on lipkowski.org X-Spam-Level: X-Spam-Status: No, score=-0.3 required=5.0 tests=BAYES_00,FORGED_HOTMAIL_RCVD, HTML_MESSAGE autolearn=no version=3.1.3 Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by paranoid.lipkowski.org (8.13.7/8.13.7) with ESMTP id sBF02p6W015469 for ; Mon, 15 Dec 2014 01:02:51 +0100 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1Y0IzF-0001Wq-0z for rs_out_1@blacksheep.org; Sun, 14 Dec 2014 23:54:05 +0000 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1Y0IzE-0001Wh-CR for rsgb_lf_group@blacksheep.org; Sun, 14 Dec 2014 23:54:04 +0000 Received: from blu004-omc1s29.hotmail.com ([65.55.116.40]) by relay1.thorcom.net with esmtps (TLSv1.2:AES256-SHA256:256) (Exim 4.84) (envelope-from ) id 1Y0IzC-0007b1-Ib for rsgb_lf_group@blacksheep.org; Sun, 14 Dec 2014 23:54:03 +0000 Received: from BLU177-W24 ([65.55.116.7]) by BLU004-OMC1S29.hotmail.com over TLS secured channel with Microsoft SMTPSVC(7.5.7601.22751); Sun, 14 Dec 2014 15:54:00 -0800 X-TMN: [JQQcXQjDrt/3kfiq5zYwHJhAD4CO/erN] X-Originating-Email: [hellozerohellozero@hotmail.com] Message-ID: From: Laurence KL7 L To: "rsgb_lf_group@blacksheep.org" Date: Sun, 14 Dec 2014 14:53:59 -0900 Importance: Normal MIME-Version: 1.0 X-OriginalArrivalTime: 14 Dec 2014 23:54:00.0457 (UTC) FILETIME=[3B65D790:01D017F9] X-Scan-Signature: 896f9ee4f10c5db37812c155e804756d Content-Type: multipart/alternative; boundary="_c0a19fd5-1901-40c9-9f58-083ca1d78a5a_" Subject: LF: Noisy Earth mat...? 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-Scanned-By: MIMEDefang 2.56 on 10.1.3.10 Status: O X-Status: X-Keywords: X-UID: 1494 --_c0a19fd5-1901-40c9-9f58-083ca1d78a5a_ Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable It so happens my 10ft diameter multi turn LF loop is now plonked in the cen= tre of an extensive earth mat consisting of bonded welded fence wire=2C and= about 100 x 100ft radials=2C numerous Earth rods etc part of the MF tx sys= tem - Cant detect any diode type effects from the mat.... =20 Ive noticed since the loop has been surrounded by this "mat" the induced no= ise into the loop has increased and the loop effectiveness at 137kHz has b= een severely compromised (about 5dB on Transpolar paths over an optimized = positional L400B) - the mat and the loop are above 2.5 metres apart and n= ot electrically connected (galvanically isolated) with common mode chokes o= n the 400 coax - there is no local coupling from the MF Marconi ie I can s= hort it to ground or bring it down and the background noise (somewhat White= in nature around -95dBm) doesn't change.... =20 So I just wondered if I should move my loop to a new Green field location a= way from the radial mat etc - anyone else noticed similar?? Any suggestions= ? =20 Thanks Laurence KL7L et al ps over the pole is poor this evening so far with a little spreading... = --_c0a19fd5-1901-40c9-9f58-083ca1d78a5a_ Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable

It so happens =3Bmy 10ft dia= meter multi turn LF loop is now plonked in the centre of =3Ban extensiv= e earth mat consisting of bonded welded fence wire=2C and about =3B100 = x 100ft =3Bradials=2C numerous Earth rods etc part of the MF tx system = - Cant detect any diode type effects from the mat....
=3B
Ive no= ticed since the loop has been surrounded by this "mat" the =3Binduced n= oise into the loop =3Bhas increased and the loop effectiveness at 137kH= z =3Bhas been severely compromised =3B (about 5dB on Transpolar pa= ths over an optimized positional L400B) =3B - the mat and the loop are = above 2.5 metres apart =3B and not electrically connected (galvanically= isolated) with common mode chokes on the 400 coax =3B- =3B there i= s no local coupling from the MF Marconi ie I can short it to ground or brin= g it down and the background noise (somewhat White in nature around -95dBm)= doesn't change....
=3B
So I just wondered if I should move my l= oop to a new Green field location away from the radial mat etc - anyone els= e noticed similar?? Any suggestions?
=3B
Thanks
Laurence KL7L= et al
ps over the pole is poor this evening so far with a little spread= ing...

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