Return-Path: Received: (qmail 19370 invoked from network); 11 Aug 2001 14:26:17 -0000 Received: from unknown (HELO murphys-inbound.services.quay.plus.net) (212.159.14.225) by excalibur.plus.net with SMTP; 11 Aug 2001 14:26:17 -0000 Received: (qmail 2301 invoked from network); 11 Aug 2001 14:25:50 -0000 Received: from unknown (HELO post.thorcom.com) (212.172.148.70) by murphys with SMTP; 11 Aug 2001 14:25:50 -0000 Received: from majordom by post.thorcom.com with local (Exim 3.16 #2) id 15VZdu-00027z-00 for rsgb_lf_group-outgoing@blacksheep.org; Sat, 11 Aug 2001 15:21:34 +0100 Received: from cmailenv4.svr.pol.co.uk ([213.218.77.56]) by post.thorcom.com with esmtp (Exim 3.16 #2) id 15VZdt-00027u-00 for rsgb_lf_group@blacksheep.org; Sat, 11 Aug 2001 15:21:33 +0100 Received: from [62.21.130.73] (helo=w8k3f0) by cmailENV4.svr.pol.co.uk with smtp (Exim 3.22 #1) id 15VZdH-0000R1-00; Sat, 11 Aug 2001 14:20:55 +0000 Message-ID: <003301c12271$e90740a0$4982153e@w8k3f0> From: "Dick Rollema" To: "LF-Group" Cc: "J. Kroon, PA0IF" , "Klaas Robers, PA0KLS" , "Koos Fockens, PA0KDF" , "Jan Harte, PA0HRT" , "Jan Ottens, PA0SSB" Subject: LF: Field strength of commercial LF stations Date: Sat, 11 Aug 2001 16:27:47 +0200 MIME-Version: 1.0 Content-Type: text/html; charset=windows-1252 X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 5.00.2314.1300 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1106 Precedence: bulk Reply-To: rsgb_lf_group@blacksheep.org X-Listname: rsgb_lf_group Sender: Content-transfer-encoding: 8bit

To All from PA0SE

I have measured the field strength of some commercial LF stations in my shack, using the untuned single turn loop method.

MSF 60 kHz 1.95mV/m

Rugby 73.25 kHz 1.35mV/m

DCF 77 77.5kHz 2.54mV/m

Mainflingen 128.93kHz 3.62mV/m

DCF139 138.83kHz 2.02mV/m

The transmitter at Mainflingen (near Frankfurt) radiates a similar signal, or perhaps the same one, as DCF139: a carrier with a burst of data in FSK at irregular intervals.

73, Dick, PA0SE