Return-Path: Received: (qmail 19621 invoked from network); 18 Jul 2002 09:20:37 -0000 Received: from marstons.services.quay.plus.net (212.159.14.223) by mailstore with SMTP; 18 Jul 2002 09:20:37 -0000 X-Priority: 3 X-MSMail-Priority: Normal Received: (qmail 13985 invoked by uid 10001); 18 Jul 2002 09:24:15 -0000 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1106 Received: from post.thorcom.com (193.82.116.70) by marstons.services.quay.plus.net with SMTP; 18 Jul 2002 09:24:15 -0000 X-SQ: A Received: from majordom by post.thorcom.com with local (Exim 3.33 #2) id 17V7O4-0006kl-00 for rsgb_lf_group-outgoing@blacksheep.org; Thu, 18 Jul 2002 10:15:52 +0100 Received: from cmailenv2.svr.pol.co.uk ([213.218.77.54]) by post.thorcom.com with esmtp (Exim 3.33 #2) id 17V7O3-0006kg-00 for rsgb_lf_group@blacksheep.org; Thu, 18 Jul 2002 10:15:51 +0100 Received: from [62.21.132.137] (helo=w8k3f0.freeler.nl) by cmailENV2.svr.pol.co.uk with esmtp (Exim 3.35 #1) id 17V7Ny-0007Nl-00 for rsgb_lf_group@blacksheep.org; Thu, 18 Jul 2002 09:15:46 +0000 Message-ID: <5.1.0.14.0.20020718110848.009f7960@POP3.freeler.nl> X-Sender: FRE0000086604@POP3.freeler.nl X-Mailer: QUALCOMM Windows Eudora Version 5.1 Date: Thu, 18 Jul 2002 11:17:29 +0200 To: rsgb_lf_group@blacksheep.org From: "Dick Rollema" Subject: =?UTF-8?Q?Re:_LF:_Activity_from_DLF=C2=B4s_360m_mast?= In-reply-to: <003001c22c3d$9fbd3680$5f74ccd4@DEFAULT> MIME-Version: 1.0 Content-Type: text/html; charset=windows-1252 Precedence: bulk Reply-To: rsgb_lf_group@blacksheep.org X-Listname: rsgb_lf_group Sender: Content-transfer-encoding: 8bit Dear Walter and the LF-gang,

Assuming the 360m mast has no top load my antenna simulation program gives a feedpoint impedance of
Z = 11.9 - j149 ohm over perfect ground. The reactive part depends on the diameter of the mast of course which I have arbitrarily put at 3m.
Be sure to measure the current into the mast so the EMRP can be calculated.

I will probably not be at home to work you as we will spent the day with several amateur radio friends at a camping site near Eindhoven. But I will take my W & G SPM-12 with me, together with a frame aerial so I hope I can measure your field strength.

Looking forward to an interesting experiment I wish you and your friends good luck and a good match.

73, Dick, PA0SE

At 22:24 15-7-02 +0200, you wrote:

Hello to all LF`ers,
on Wednesday, 24th of July, the 153KHz transmitter of Deutschlandfunk in Donebach (JN49ON, 50Km SSE of Frankfurt) will be off air due to scheduled maintenance. By the friendly cooperation of the site personnel and with consent of the regulation authorities, a small group of German LF amateurs has been granted access to one of the 360m masts between 7:00 and 15:00UTC. With a little luck we might be able to achieve about 30dB more radiation efficiency than at home.
We will probably need some time to work out the impedance matching. After that, we intend to operate preferably in CW and Slow-CW modes. As we expect a rather high noisefloor from the Frankfurt area, we will bring along a tuned loop for receiving, and we will be QRV on 7030KHz in CW as well. If nothing else works, please give us a phone call on+49 174 3692499, or send an email note via the reflector or to dj2lf@darc.de or markusvester@aol.com.
Let`s look forward to a successfull day, hopefully without thunderstorms or strong noise.
73
The group: Markus - DF6NM, Walter - DJ2LF, Ralph - DL2NDO, Ralph - DK3GH, Roland - DL3NDR, Franz - DL5NER