Return-Path: Received: (qmail 671 invoked from network); 3 May 2002 17:02:16 -0000 Received: from unknown (HELO murphys-inbound.services.quay.plus.net) (212.159.14.225) by excalibur.plus.net with SMTP; 3 May 2002 17:02:16 -0000 X-Priority: 3 X-MSMail-Priority: Normal Received: (qmail 25766 invoked from network); 3 May 2002 17:02:09 -0000 Received: from unknown (HELO post.thorcom.com) (212.172.148.70) by murphys.services.quay.plus.net with SMTP; 3 May 2002 17:02:09 -0000 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1106 Received: from majordom by post.thorcom.com with local (Exim 3.33 #2) id 173hoH-0004kb-00 for rsgb_lf_group-outgoing@blacksheep.org; Fri, 03 May 2002 19:29:37 +0100 Received: from mailout09.sul.t-online.com ([194.25.134.84]) by post.thorcom.com with esmtp (Exim 3.33 #2) id 173hoG-0004kW-00 for rsgb_lf_group@blacksheep.org; Fri, 03 May 2002 19:29:36 +0100 Received: from fwd08.sul.t-online.de by mailout09.sul.t-online.com with smtp id 173gHH-0000SN-0I; Fri, 03 May 2002 18:51:27 +0200 Received: from (0482183881-0001@[62.156.6.136]) by fwd08.sul.t-online.com with smtp id 173gH1-1aLBQGC; Fri, 3 May 2002 18:51:11 +0200 From: "jannsen" <0482183881-0001@t-online.de> To: rsgb_lf_group@blacksheep.org References: <5.1.0.14.0.20020502094245.00a23380@POP3.freeler.nl> Subject: LF: RYCOM-meter X-Mailer: T-Online eMail 2.34 MIME-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 8bit Date: Fri, 3 May 2002 18:51:11 +0200 Message-ID: <173gH1-1aLBQGC@fwd08.sul.t-online.com> X-Sender: 0482183881-0001@t-dialin.net Precedence: bulk Reply-To: rsgb_lf_group@blacksheep.org X-Listname: rsgb_lf_group Sender: Hi all, I use the signal of DCF39 in order to test my antennas. I read off the values from the METER. of a RYCOM receiver. So far only the DB scale of the instrument interested me. Among them are two further scales, which indicate RMS VOLTS. Ranges: DECIBELS -20 - +2 RMS VOLTS 0 - 10 RMS VOLTS 0 - 3 Entry right above: 1MW 600 ohms The values indicated for DCF39: +2 DECIBEL, 9.8 RMS VOLTS and >3 RMS VOLTS (attenuator in position -30dB). My slide rule says: 2 dBm with 600 ohms = 0.98 V Ueff and RMS (roots mean square) nevertheless Ueff means or? (setting instead of dBm dBuV comes on 1,6uV. Completely beside it.) How does it come to that "potential" difference ? regards Uwe/dj8wx