Return-Path: Received: from rly-mf01.mx.aol.com (rly-mf01.mail.aol.com [172.20.29.171]) by air-mf03.mail.aol.com (v121.4) with ESMTP id MAILINMF033-93f475e94a8f8; Tue, 11 Dec 2007 08:46:28 -0500 Received: from post.thorcom.com (post.thorcom.com [193.82.116.20]) by rly-mf01.mx.aol.com (v121.4) with ESMTP id MAILRELAYINMF015-93f475e94a8f8; Tue, 11 Dec 2007 08:46:18 -0500 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1J25QI-0004GZ-2B for rs_out_1@blacksheep.org; Tue, 11 Dec 2007 13:45:22 +0000 Received: from [193.82.116.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1J25QH-0004GQ-Fh for rsgb_lf_group@blacksheep.org; Tue, 11 Dec 2007 13:45:21 +0000 Received: from web25406.mail.ukl.yahoo.com ([217.12.10.140]) by relay1.thorcom.net with smtp (Exim 4.63) (envelope-from ) id 1J25QH-0008LI-5a for rsgb_lf_group@blacksheep.org; Tue, 11 Dec 2007 13:45:21 +0000 Received: (qmail 5543 invoked by uid 60001); 11 Dec 2007 13:45:11 -0000 DomainKey-Signature: a=rsa-sha1; q=dns; c=nofws; s=s1024; d=yahoo.co.uk; h=X-YMail-OSG:Received:Date:From:Subject:To:In-Reply-To:MIME-Version:Content-Type:Content-Transfer-Encoding:Message-ID; b=0rowm2q++ulFkDmF3IRsBhzPs/67joXJs+1xN4U6zUL5rFaPAruHc22uVz6zu8dwejetbKNg7FkiWJHhCq1raDEost3B5ekS0yfBvdQrkT0U4WSQcf5IEysNge5rOcgdKNZZ90eLM+7f3Tp3WL8y9bQ7p4iWLu2SgMnX5pbAzVI=; X-YMail-OSG: vezNdDkVM1lkhrLOwTPLEvV._yk9mDZSPYCrEjFvCRKXeOCprMBBZdK.dYHt170TotvqdetcgLy7USwSVcnP4y3MAmPn5MQEOGw438ekv5uVDEWEsZlhbyLRB0U- Received: from [213.78.182.231] by web25406.mail.ukl.yahoo.com via HTTP; Tue, 11 Dec 2007 13:45:10 GMT Date: Tue, 11 Dec 2007 13:45:10 +0000 (GMT) From: brian hodgson To: rsgb_lf_group@blacksheep.org In-Reply-To: <8CA09AB51F80A79-140-1EED@webmail-da06.sysops.aol.com> MIME-Version: 1.0 Message-ID: <227284.5484.qm@web25406.mail.ukl.yahoo.com> X-Karma: 0: DomainKey-Status: good (testing) Subject: Re: LF: 500kHz 9/10 Dec Content-Type: multipart/alternative; boundary="0-300768215-1197380710=:5484" Content-Transfer-Encoding: 8bit X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: X-Spam-Status: No, hits=0.5 required=5.0 tests=HTML_20_30,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-IP: 193.82.116.20 X-AOL-SCOLL-AUTHENTICATION: listenair ; SPF_helo : n X-AOL-SCOLL-AUTHENTICATION: listenair ; SPF_822_from : n X-Mailer: Unknown (No Version) --0-300768215-1197380710=:5484 Content-Type: text/plain; charset=iso-8859-1 Content-Transfer-Encoding: 8bit Hi David - I'm getting half a microvolt from your beacon using a 3 turn loop with area of one square metre. I figure that works out at 17 microvolts per metre field strength. I'm 23 km due north of you so I reckon that adds up to an EIRP of 5.1 milliwatts. Anyone care to check my sums? The loop is in my garden so might be affected by my aerials and house wiring but it does give deep nulls and sensible readings on stronger signals. Half a microvolt is also the minimum usable reading on my SPM-30 SLM so there may be errors due to the low signal-to-noise ratio. Brian (G3YKB) g0mrf@aol.com wrote: With the recent work by Jim M0BMU, I suspect my ERP amy not quite be the 5mW I have estimated. --------------------------------- Sent from Yahoo! - a smarter inbox. --0-300768215-1197380710=:5484 Content-Type: text/html; charset=iso-8859-1 Content-Transfer-Encoding: 8bit
Hi David -
 
I'm getting half a microvolt from your beacon using a 3 turn loop with area of one square metre. I figure that works out at 17 microvolts per metre field strength. I'm 23 km due north of you so I reckon that adds up to an EIRP of 5.1 milliwatts. Anyone care to check my sums?
 
The loop is in my garden so might be affected by my aerials and house wiring but it does give deep nulls and sensible readings on stronger signals. Half a microvolt is also the minimum usable reading on my SPM-30 SLM so there may be errors due to the low signal-to-noise ratio. 
 
Brian (G3YKB)  

g0mrf@aol.com wrote:
 
With the recent work by Jim M0BMU, I suspect my ERP amy not quite be the 5mW I have estimated.


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