Return-Path: Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by mtain-mp01.r1000.mx.aol.com (Internet Inbound) with ESMTP id A2CEF38000096; Tue, 8 Jan 2013 13:09:42 -0500 (EST) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1TsdbT-0000nY-7z for rs_out_1@blacksheep.org; Tue, 08 Jan 2013 18:08:47 +0000 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1TsdbS-0000nP-Mh for rsgb_lf_group@blacksheep.org; Tue, 08 Jan 2013 18:08:46 +0000 Received: from mail-qc0-f180.google.com ([209.85.216.180]) by relay1.thorcom.net with esmtps (TLSv1:RC4-SHA:128) (Exim 4.77) (envelope-from ) id 1TsdbQ-0002HN-1c for rsgb_lf_group@blacksheep.org; Tue, 08 Jan 2013 18:08:45 +0000 Received: by mail-qc0-f180.google.com with SMTP id v28so932782qcm.39 for ; Tue, 08 Jan 2013 10:08:22 -0800 (PST) X-DKIM-Result: Domain=gmail.com Result=Good and Known Domain DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:date:message-id:subject:from:to:content-type; bh=wSs2yn5JBIwjm6lwWmDUtdNeJu0gCjXenW0/SpqF0Jk=; b=k9fx/P8KfIhLc42C+dLQCHxAIsA8CRu5ru04mLPxo4/GVpsnbHlHLz33ZUSCl8Jnmm IlgBouz+gXvEgXzjYpBL4AxtAbrXuGZ3DTdCvXWtqFtJ0vvHZa3WDb6SFxnV9bsFHeLp rpAavzsL5pq9qClp7TsXau+k+PtbKelwL5UoW+ZwAQL09KXoii/V/uP/1i/ea8GVssD8 u+/fImQ8SUmLf/EEguesXebGVn1JCOG2xNZmjnX+EiOhi/QSsd94xF8paGhT2Rt3GETc JS4AnvmE2zAonWlMJvC00y737ZUgyZccBw+6UeK0fF9gyZp4J9uujKjqvYzWiiBDAGRu OfLw== MIME-Version: 1.0 Received: by 10.224.17.193 with SMTP id t1mr45084367qaa.89.1357668501951; Tue, 08 Jan 2013 10:08:21 -0800 (PST) Received: by 10.229.156.18 with HTTP; Tue, 8 Jan 2013 10:08:21 -0800 (PST) Date: Tue, 8 Jan 2013 18:08:21 +0000 Message-ID: From: Roger Lapthorn To: "rsgb_lf_group@blacksheep.org" , rsgb_lf_group@yahoogroups.co.uk, Eddie X-Spam-Score: -0.7 (/) X-Spam-Report: Spam detection software, running on the system "relay1.thorcom.net", has identified this incoming email as possible spam. The original message has been attached to this so you can view it (if it isn't spam) or label similar future email. If you have any questions, see the administrator of that system for details. Content preview: The last part of my experiment with 472kHz (odd) antennas is to use a more normal antenna! So, this afternoon I've erected a better Marconi with about 9m of vertical reasonably in the clear with 30uH inductance just before the T top section (these are around 3m long each side) and another 30uH near the bottom. A bit more top inductance would be preferable. I am tuning the antenna to resonance with my ferrite rod still and tuning against 3 ground rods and my central heating copper. Initial results suggest around 100mW ERP is now being achieved and reports would appear to confirm this improvement. [...] Content analysis details: (-0.7 points, 5.0 required) pts rule name description ---- ---------------------- -------------------------------------------------- -0.7 RCVD_IN_DNSWL_LOW RBL: Sender listed at http://www.dnswl.org/, low trust [209.85.216.180 listed in list.dnswl.org] 0.0 FREEMAIL_FROM Sender email is commonly abused enduser mail provider (rogerlapthorn[at]gmail.com) -0.0 SPF_PASS SPF: sender matches SPF record 0.0 HTML_MESSAGE BODY: HTML included in message 0.0 T_DKIM_INVALID DKIM-Signature header exists but is not valid X-Scan-Signature: c9d6a1e47761f7ec7375ac340bef30d0 Subject: LF: 472kHz antenna experiments Content-Type: multipart/alternative; boundary=bcaec51b16d5c8131704d2cad4f7 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=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-SCOLL-AUTHENTICATION: mtain-mp01.r1000.mx.aol.com ; domain : gmail.com DKIM : fail x-aol-sid: 3039ac1dc14550ec60e519f1 X-AOL-IP: 195.171.43.25 X-AOL-SPF: domain : blacksheep.org SPF : none --bcaec51b16d5c8131704d2cad4f7 Content-Type: text/plain; charset=ISO-8859-1 The last part of my experiment with 472kHz (odd) antennas is to use a more normal antenna! So, this afternoon I've erected a better Marconi with about 9m of vertical reasonably in the clear with 30uH inductance just before the T top section (these are around 3m long each side) and another 30uH near the bottom. A bit more top inductance would be preferable. I am tuning the antenna to resonance with my ferrite rod still and tuning against 3 ground rods and my central heating copper. Initial results suggest around 100mW ERP is now being achieved and reports would appear to confirm this improvement. Tomorrow, after an overnight WSPR run, I should be able to quantify the improvement compared with the various flavours of earth electrode antennas. Any 472kHz WSPR reports in the next 12 hours would be appreciated. 73s Roger G3XBM -- http://g3xbm-qrp.blogspot.com/ http://www.g3xbm.co.uk https://sites.google.com/site/sub9khz/ http://qss2.blogspot.com/ --bcaec51b16d5c8131704d2cad4f7 Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable
The last part of my experime= nt with 472kHz (odd) antennas is to use a more normal antenna!=A0

S= o, this afternoon I've erected a better Marconi with about 9m of vertic= al reasonably in the clear with 30uH inductance just before the T top secti= on (these are around 3m long each side) and another 30uH near the bottom.= =A0 A bit more top inductance would be preferable.=A0 I am tuning the anten= na to resonance with my ferrite rod still and tuning against 3 ground rods = and my central heating copper.=A0 Initial results suggest around 100mW ERP = is now being achieved and reports would appear to confirm this improvement.=

Tomorrow, after an overnight WSPR run, I should be ab= le to quantify the improvement compared with the various flavours of earth = electrode antennas.

Any 472kHz WSPR reports in the next 12 hou= rs would be appreciated.

73s
Roger G3XBM
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