Return-Path: Received: (qmail 12465 invoked from network); 24 Nov 2003 13:35:52 -0000 Received: from unknown (HELO warrior.services.quay.plus.net) (212.159.14.227) by mailstore with SMTP; 24 Nov 2003 13:35:52 -0000 Received: (qmail 434 invoked from network); 24 Nov 2003 13:35:59 -0000 X-Filtered-by: Plusnet (hmail v1.01) X-Priority: 3 X-MSMail-Priority: Normal X-Spam-detection-level: 11 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1106 Received: from post.thorcom.com (193.82.116.20) by warrior.services.quay.plus.net with SMTP; 24 Nov 2003 13:35:55 -0000 X-Fake-Domain: majordom Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1AOGrh-0002YG-V8 for rsgb_lf_group-outgoing@blacksheep.org; Mon, 24 Nov 2003 13:34:57 +0000 Received: from [213.218.75.231] (helo=smtp02.freeler.nl) by post.thorcom.com with esmtp (Exim 4.14) id 1AOGrd-0002Y7-IG for rsgb_lf_group@blacksheep.org; Mon, 24 Nov 2003 13:34:53 +0000 Received: (qmail 32531 invoked from network); 24 Nov 2003 13:34:53 -0000 X-Fake-Domain: unknown Received: from unknown (HELO w8k3f0.freeler.nl) ([62.21.168.117]) (envelope-sender ) by smtp02.freeler.nl (qmail-ldap-1.03) with SMTP for ; 24 Nov 2003 13:34:52 -0000 Message-ID: <5.1.0.14.0.20031124142908.024529c0@POP3.freeler.nl> X-Sender: FRE0000086604@POP3.freeler.nl X-Mailer: QUALCOMM Windows Eudora Version 5.1 Date: Mon, 24 Nov 2003 14:30:16 +0100 To: "LF-Group" From: "Dick Rollema" MIME-Version: 1.0 Subject: LF: PA0SE Field Srength Meter for 137 kHz Content-Type: text/html; charset=windows-1252 X-Spam-Checker-Version: SpamAssassin 2.60 (1.212-2003-09-23-exp) on post.thorcom.com X-Spam-Status: No, hits=0.0 required=5.0 tests=HTML_MESSAGE autolearn=no version=2.60 X-SA-Exim-Scanned: Yes Sender: Precedence: bulk Reply-To: rsgb_lf_group@blacksheep.org X-Listname: rsgb_lf_group X-SA-Exim-Rcpt-To: rsgb_lf_group-outgoing@blacksheep.org X-SA-Exim-Scanned: No; SAEximRunCond expanded to false X-Spam-Rating: 1 Content-transfer-encoding: 8bit To All from PA0SE

A description of my Field Strength Meter for 136 kHz can be found on several web sites.

I just found out that on some web sites the formula for the power that produces a certain field strength is wrongly given as
P = 0.0111(E * d)2.

The correct formula is:

P = 0.0111(E *d)² in which:

P in watt
E in mV/m
D in kilometre
* means multiplication

Dick Rollema, PA0SE