Return-Path: Received: from mtain-mi01.r1000.mx.aol.com (mtain-mi01.r1000.mail.aol.com [172.21.131.154]) by air-df07.mail.aol.com (v129.4) with ESMTP id MAILINDF073-5efc4c9645dd31c; Sun, 19 Sep 2010 13:18:21 -0400 Received: from post.thorcom.com (unknown [195.171.43.25]) by mtain-mi01.r1000.mx.aol.com (Internet Inbound) with ESMTP id 8574F3800004D; Sun, 19 Sep 2010 13:18:20 -0400 (EDT) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1OxNVB-0002p2-1t for rs_out_1@blacksheep.org; Sun, 19 Sep 2010 18:16:33 +0100 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1OxNV0-0002oi-Lh for rsgb_lf_group@blacksheep.org; Sun, 19 Sep 2010 18:16:22 +0100 Received: from cavuit01.kulnet.kuleuven.be ([134.58.240.43]) by relay1.thorcom.net with esmtp (Exim 4.63) (envelope-from ) id 1OxNUz-0005G6-G0 for rsgb_lf_group@blacksheep.org; Sun, 19 Sep 2010 18:16:23 +0100 Received: from smtps02.kuleuven.be (smtpshost02.kulnet.kuleuven.be [134.58.240.75]) by cavuit01.kulnet.kuleuven.be (Postfix) with ESMTP id 7039D7B8047 for ; Sun, 19 Sep 2010 19:16:13 +0200 (CEST) Received: from ICTS-S-HUB-N2.luna.kuleuven.be (icts-s-hub-n2.luna.kuleuven.be [10.112.9.12]) by smtps02.kuleuven.be (Postfix) with ESMTP id 2783BF3862 for ; Sun, 19 Sep 2010 19:16:13 +0200 (CEST) Received: from ICTS-S-EXC2-CA.luna.kuleuven.be ([10.112.11.13]) by ICTS-S-HUB-N2.luna.kuleuven.be ([10.112.9.12]) with mapi; Sun, 19 Sep 2010 19:16:13 +0200 X-Kuleuven: This mail passed the K.U.Leuven mailcluster From: Rik Strobbe To: "rsgb_lf_group@blacksheep.org" Date: Sun, 19 Sep 2010 19:16:13 +0200 Thread-Topic: 137.5kHz WSPR - reports appreciated Thread-Index: ActYGjzUpnNblk1xQJSy/dl6tA92KQAAypHr Message-ID: References: In-Reply-To: Accept-Language: nl-NL, nl-BE Content-Language: nl-BE X-MS-Has-Attach: X-MS-TNEF-Correlator: acceptlanguage: nl-NL, nl-BE MIME-Version: 1.0 X-KULeuven-Information: Katholieke Universiteit Leuven X-KULeuven-Scanned: Found to be clean X-KULeuven-Envelope-From: rik.strobbe@fys.kuleuven.be X-Spam-Score: 0.0 (/) X-Spam-Report: autolearn=disabled,HTML_MESSAGE=0.001 Subject: LF: RE: 137.5kHz WSPR - reports appreciated Content-Type: multipart/alternative; boundary="_000_BF4A524700075746A6467658DFC7102C63821D3D42ICTSSEXC2CAlu_" X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: X-Spam-Status: No, hits=0.8 required=5.0 tests=HTML_30_40,HTML_MESSAGE, TO_ADDRESS_EQ_REAL 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: S X-AOL-REROUTE: YES x-aol-sid: 3039400cdec94c9645dc0ed5 X-AOL-IP: 195.171.43.25 X-AOL-SPF: domain : blacksheep.org SPF : none X-Mailer: Unknown (No Version) --_000_BF4A524700075746A6467658DFC7102C63821D3D42ICTSSEXC2CAlu_ Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Roger, increasing the loop from 70 sq m to 80 sq m should increase the radiation= resistance by (8/7)^2 =3D 1.3 =3D +/- 1dB. Having the loop wire laying on the ground certainly adds some losses, but= probably the wire resistance loss is dominating. 73, Rik ON7YD - OR7T ________________________________ Van: owner-rsgb_lf_group@blacksheep.org [owner-rsgb_lf_group@blacksheep.or= g] namens Roger Lapthorn [rogerlapthorn@gmail.com] Verzonden: zondag 19 september 2010 18:43 Aan: rsgb_lf_group@blacksheep.org Onderwerp: LF: 137.5kHz WSPR - reports appreciated This afternoon I dropped the lower part of my loop so it now lays on the= ground. Tuning seems unaffected, but the loop area is about 10sq m greate= r. Overall it is hard to see small changes but G3XIZ does seem to be givin= g me a consistent -22dB which is maybe 1dB better. My 137.5kHz WSPR beacon is on this evening and I'd dearly love to get a fe= w new reports, maybe from a little further away. Clearly at any distance= copy will be right on the edge. 73s Roger G3XBM -- http://g3xbm-qrp.blogspot.com/ http://www.g3xbm.co.uk http://www.youtube.com/user/g3xbm G3XBM GQRP 1678 ISWL G11088 --_000_BF4A524700075746A6467658DFC7102C63821D3D42ICTSSEXC2CAlu_ Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
Roger,
 
increasing the loop from 70 sq m to= 80 sq m should increase the radiation resistance by (8/7)^2 =3D 1.3 =3D= +/- 1dB.
Having the loop wire laying on the= ground certainly adds some losses, but probably the wire resistance= loss is dominating.
 
73, Rik  ON7YD - OR7T
 
Van: owner-rsgb_= lf_group@blacksheep.org [owner-rsgb_lf_group@blacksheep.org] namens Roger= Lapthorn [rogerlapthorn@gmail.com]
Verzonden: zondag 19 september 2010 18:43
Aan: rsgb_lf_group@blacksheep.org
Onderwerp: LF: 137.5kHz WSPR - reports appreciated

This afternoon I dropped the lower part of my loop so it now lays on= the ground. Tuning seems unaffected, but the loop area is about 10sq m gr= eater. Overall it is hard to see small changes but G3XIZ does seem to be= giving me a consistent -22dB which is maybe 1dB better.

My 137.5kHz WSPR beacon is on this evening and I'd dearly love to get a fe= w new reports, maybe from a little further away. Clearly at any distance= copy will be right on the edge.

73s
Roger G3XBM

--
http://g3xbm-= qrp.blogspot.com/
http://www.g3xbm.co.u= k
http://www= .youtube.com/user/g3xbm
G3XBM   GQRP 1678    ISWL G11088
--_000_BF4A524700075746A6467658DFC7102C63821D3D42ICTSSEXC2CAlu_--