Return-Path: Received: (qmail 1966 invoked from network); 12 Apr 2000 10:57:43 -0000 Received: from unknown (HELO post.thorcom.com) (212.172.148.70) by bells.core.plus.net.uk with SMTP; 12 Apr 2000 10:57:43 -0000 Received: from majordom by post.thorcom.com with local (Exim 3.02 #1) id 12fKir-0000A8-00 for rsgb_lf_group-outgoing@blacksheep.org; Wed, 12 Apr 2000 11:50:13 +0100 Received: from rubellite.lion-access.net ([212.19.217.4]) by post.thorcom.com with esmtp (Exim 3.02 #1) id 12fKiq-0000A3-00 for rsgb_lf_group@blacksheep.org; Wed, 12 Apr 2000 11:50:12 +0100 Received: from w8k3f0 (1Cust38.tnt6.rtm1.nl.uu.net [212.153.214.38]) by rubellite.lion-access.net (I-Lab) with SMTP id 99B966BD73 for ; Tue, 11 Apr 2000 20:38:22 +0000 (GMT) Message-ID: <000a01bfa3f7$16fd1e80$26d699d4@w8k3f0> From: "Dick Rollema" To: "LF-Group" Subject: LF: Opration from ex-Decca station Date: Tue, 11 Apr 2000 22:46:14 +0200 Organization: Freeler 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

At 1737 UTC I heard and worked G3WSC/P with Derek, G3GRO at the key.

Their signal was -70 dBm (S9 + 3dB) at the receiver input. The corresponding field strength is 32 microvolt/meter. ERP was given as 1W and transmitter output as 10W.

At 2000 UTC I listened on 73 kHz but heard (or saw on Spectogram) no signal. But local noise level is pretty high in the evening hours.

I had just completed an untuned single turn screened loop with an area of 1 metre squared.

Connected to a Wandel & Goltermann selective level meter type SPM-12 (a recent acquisition) I measured the field strength of DCF139 (138.83kHz) in the shack at 2 mV/m and of DCF77 (77.5 kHz) at 3.2 mV/m. These values were used to find the relation between field strength and receiver input voltage.

When one of the coming days it is dry I will repeat the FS measurements in an open field. This can be easily done because the SPM-12 can also be fed from a 12 V battery. The results will enable me to use the station receiver as a field strength meter at both 73 and 136 kHz.

I am looking forward to more of these interesting "Decca" tests!

73, Dick, PA0SE