Return-Path: Received: (qmail 17754 invoked from network); 6 Jul 2003 20:56:35 -0000 Received: from netmail01.services.quay.plus.net (212.159.14.219) by mailstore with SMTP; 6 Jul 2003 20:56:35 -0000 X-Priority: 3 X-MSMail-Priority: Normal Received: (qmail 1435 invoked by uid 10001); 6 Jul 2003 20:56:35 -0000 Received: from post.thorcom.com (193.82.116.70) by netmail01.services.quay.plus.net with SMTP; 6 Jul 2003 20:56:35 -0000 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1106 X-SQ: A Received: from majordom by post.thorcom.com with local (Exim 4.14) id 19ZGYE-00031z-Nt for rsgb_lf_group-outgoing@blacksheep.org; Sun, 06 Jul 2003 21:56:02 +0100 Received: from [213.218.75.232] (helo=smtp03.freeler.nl) by post.thorcom.com with esmtp (Exim 4.14) id 19ZGYA-00031d-43 for rsgb_lf_group@blacksheep.org; Sun, 06 Jul 2003 21:55:58 +0100 Received: (qmail 20548 invoked from network); 6 Jul 2003 20:55:27 -0000 Received: from unknown (HELO w8k3f0.freeler.nl) ([62.21.139.156]) (envelope-sender ) by smtp03.freeler.nl (qmail-ldap-1.03) with SMTP for ; 6 Jul 2003 20:55:27 -0000 Message-ID: <5.1.0.14.0.20030706225246.0220c860@POP3.freeler.nl> X-Sender: FRE0000086604@POP3.freeler.nl X-Mailer: QUALCOMM Windows Eudora Version 5.1 Date: Sun, 06 Jul 2003 22:58:50 +0200 To: rsgb_lf_group@blacksheep.org From: "Dick Rollema" In-reply-to: <000001c343db$8cb86760$5967fea9@p4o2b7> MIME-Version: 1.0 Subject: Re: LF: Field strength calcs. Content-Type: text/html; charset=windows-1252 X-Spam-Status: No, hits=1.0 required=5.0tests=HTML_10_20,HTML_MESSAGE,IN_REP_TOversion=2.55 X-Spam-Level: * X-Spam-Checker-Version: SpamAssassin 2.55 (1.174.2.19-2003-05-19-exp) 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 Content-transfer-encoding: 8bit To All from PA0SE

Ian wrote:

When making the signal strength measurements using a loop antenna should
this be resonated or aperiodic?

A resonated loop produces more signal but has to be calibrated by means of a pair of Helmholtz coils.
The voltage induced in an aperiodic loop follows from a simple formula, that can be found in Terman.
So there is no need for calibration when the loop is used with a selective level meter.

73, Dick, PA0SE