Return-Path: X-Spam-DCC: paranoid 1102; Body=2 Fuz1=2 Fuz2=2 X-Spam-Checker-Version: SpamAssassin 3.1.3 (2006-06-01) on lipkowski.org X-Spam-Level: X-Spam-Status: No, score=-0.1 required=5.0 tests=BAYES_00,DNS_FROM_AHBL_RHSBL, HTML_30_40,HTML_MESSAGE,HTML_TITLE_EMPTY,RATWARE_GECKO_BUILD autolearn=no version=3.1.3 Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by paranoid.lipkowski.org (8.13.7/8.13.7) with ESMTP id t5QHrpZY032422 for ; Fri, 26 Jun 2015 19:53:51 +0200 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1Z8Xhr-0000zg-8q for rs_out_1@blacksheep.org; Fri, 26 Jun 2015 18:46:27 +0100 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1Z8Xhq-0000zX-Rs for rsgb_lf_group@blacksheep.org; Fri, 26 Jun 2015 18:46:26 +0100 Received: from mx02.posteo.de ([89.146.194.165]) by relay1.thorcom.net with esmtps (TLSv1.2:DHE-RSA-AES256-GCM-SHA384:256) (Exim 4.85) (envelope-from ) id 1Z8Xho-0007SL-Tm for rsgb_lf_group@blacksheep.org; Fri, 26 Jun 2015 18:46:25 +0100 Received: from dovecot04.posteo.de (unknown [185.67.36.27]) by mx02.posteo.de (Postfix) with ESMTPS id 50F2C25AF532 for ; Fri, 26 Jun 2015 19:46:22 +0200 (CEST) Received: from mail.posteo.de (localhost [127.0.0.1]) by dovecot04.posteo.de (Postfix) with ESMTPSA id 3mJ5HK6zTXzFpVy for ; Fri, 26 Jun 2015 19:46:21 +0200 (CEST) Message-ID: <558D8FEC.2090102@posteo.de> Date: Fri, 26 Jun 2015 19:46:20 +0200 From: DK7FC User-Agent: Mozilla/5.0 (Windows; U; Windows NT 6.1; de; rv:1.9.1.8) Gecko/20100227 Thunderbird/3.0.3 MIME-Version: 1.0 To: rsgb_lf_group@blacksheep.org References: <8D27C7D3E7D6748-14A8-F71B3@webmail-vm149.sysops.aol.com> In-Reply-To: <8D27C7D3E7D6748-14A8-F71B3@webmail-vm149.sysops.aol.com> X-Scan-Signature: bf9cd6b3d49c805062abf73a1027fea8 Subject: Re: LF: 476.181 kHz from indoor loop Content-Type: multipart/alternative; boundary="------------060204080202070203070008" X-SA-Exim-Scanned: Yes Sender: owner-rsgb_lf_group@blacksheep.org Precedence: bulk Reply-To: rsgb_lf_group@blacksheep.org X-Listname: rsgb_lf_group X-SA-Exim-Rcpt-To: rs_out_1@blacksheep.org X-SA-Exim-Scanned: No; SAEximRunCond expanded to false X-Scanned-By: MIMEDefang 2.56 on 10.1.3.10 Status: O X-Status: X-Keywords: X-UID: 3533 This is a multi-part message in MIME format. --------------060204080202070203070008 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Hi Markus, Thanks for your DFCW-30 transmission. I can see you clearly in daytime on my RX in the city! However i can't see you on my RX is the garden! The remote system seems to run stable now, at least for a longer time then in the last 3 days :-) http://www.iup.uni-heidelberg.de/schaefer_vlf/DK7FC_remote_Grabber.html I switched between a T antenna and a loop beaming 300/120 deg but don't see you. It appears that the hill between us is (my garden is on the hill side, the city antenna is more distant to the hill) actually reducing the SNR. So it also reduces QRN from the east and favours the west. But i would prefer an omnidirectional pattern :-/ 73, Stefan Am 24.06.2015 12:11, schrieb Markus Vester: > I am currently running a DFCW-60 beacon on 476.181 kHz, using the same > 10m^2 indoor transmit loop as previously on LF. With 35 Watts of RF > input, estimated radiated power is around 2 mW, with lobes pointing > west and east. > The daytime groundwave signal is visible in the bottom panel of the > DK7FC MF grabber. Going by the CCIR plots for 3 mS/m conductivity, the > groundwave attenuation for this distance would be about 23 dB in > excess off lossless 1/r propagation, resulting in approximately 0.2 > uV/m in Heidelberg. > Best 73, > Markus (DF6NM) > --------------060204080202070203070008 Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Hi Markus,

Thanks for your DFCW-30 transmission. I can see you clearly in daytime on my RX in the city! However i can't see you on my RX is the garden! The remote system seems to run stable now, at least for a longer time then in the last 3 days :-)
http://www.iup.uni-heidelberg.de/schaefer_vlf/DK7FC_remote_Grabber.html
I switched between a T antenna and a loop beaming 300/120 deg but don't see you. It appears that the hill between us is (my garden is on the hill side, the city antenna is more distant to the hill) actually reducing the SNR. So it also reduces QRN from the east and favours the west. But i would prefer an omnidirectional pattern :-/

73, Stefan

Am 24.06.2015 12:11, schrieb Markus Vester:

I am currently running a DFCW-60 beacon on 476.181 kHz, using the same 10m^2 indoor transmit loop as previously on LF. With 35 Watts of RF input, estimated radiated power is around 2 mW, with lobes pointing west and east.

The daytime groundwave signal is visible in the bottom panel of the DK7FC MF grabber. Going by the CCIR plots for 3 mS/m conductivity, the groundwave attenuation for this distance would be about 23 dB in excess off lossless 1/r propagation, resulting in approximately 0.2 uV/m in Heidelberg.

Best 73,

Markus (DF6NM)

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