Return-Path: <owner-rsgb_lf_group@blacksheep.org> X-Spam-DCC: paranoid 1290; 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=-0.7 required=5.0 tests=BAYES_00,DNS_FROM_AHBL_RHSBL, RATWARE_GECKO_BUILD,SPF_PASS 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 u8BEdUk5001498 for <sq5bpf@lipkowski.org>; Sun, 11 Sep 2016 16:39:31 +0200 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1bj5rD-0002WY-EK for rs_out_1@blacksheep.org; Sun, 11 Sep 2016 15:35:43 +0100 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1bj5rD-0002WP-0W for rsgb_lf_group@blacksheep.org; Sun, 11 Sep 2016 15:35:43 +0100 Received: from mout02.posteo.de ([185.67.36.66]) by relay1.thorcom.net with esmtps (TLSv1.2:ECDHE-RSA-AES256-GCM-SHA384:256) (Exim 4.87) (envelope-from <selberdenken@posteo.de>) id 1bj5rB-0002WQ-2X for rsgb_lf_group@blacksheep.org; Sun, 11 Sep 2016 15:35:41 +0100 Received: from submission (posteo.de [89.146.220.130]) by mout02.posteo.de (Postfix) with ESMTPS id 78F6D20869 for <rsgb_lf_group@blacksheep.org>; Sun, 11 Sep 2016 16:35:37 +0200 (CEST) Received: from customer (localhost [127.0.0.1]) by submission (posteo.de) with ESMTPSA id 3sXD4m5ZGzz105n; Sun, 11 Sep 2016 16:35:36 +0200 (CEST) Message-ID: <57D56BB8.2050304@posteo.de> Date: Sun, 11 Sep 2016 16:35:36 +0200 From: DK7FC <selberdenken@posteo.de> 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, Renato Romero <contact@vlf.it> References: <556C6A05176D4D3C9703327B948B9A53@PCPMF> <8BD4D5505807414E8895F6B90A91FCCE@AGB> <F619FD5F8E204073B85813233B598DB8@Clemens0811> In-Reply-To: <F619FD5F8E204073B85813233B598DB8@Clemens0811> X-Scan-Signature: 64437c466041e93ffedda7fb96b22b71 Subject: ULF: A new attempt on 2970 Hz Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit 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 10.1.3.11 Status: RO X-Status: X-Keywords: X-UID: 8723 Hi ULF, Since yesterday (10.Sep), 11 UTC, i'm running a new experiment on the 101 km band. It is in 31.2 km distance to my transmitter-site. The last experiment did not produce satisfying results due to various reasons. Now i improved the loop cross section area, the loop orientation, GPS reception (for the 1 PPS + NMEA reference signal). Furthermore the recording sample rate was reduced to 32 kS/s which allows about 3 days of stereo recording. I'm still using the Raspberry Pi2 for therecording. The system consumes just 150 mA from a 12V battery. 3x 7 Ah lead acid batteries are in use now. The transmission contains stable carriers and a short DFCW-12000 message, "73". The transmission can be followed on my 3.5 km distant forest grabber at http://www.iup.uni-heidelberg.de/schaefer_vlf/DK7FC_VLF_Grabber2.html , as usual. Relative to the last experiment, the average QRN has dropped significantly now, another advantage. So i'm quite optimistic to get a good result! The next experiment in about 60 km distance is already in preparation. Then i will use my new coil which is still in preparation. The last measurement, after completing the 3rd stack, showed a resonance frequency of 4.27 kHz. So it should have 2.8 H now... In the next experiment, i will use 100 mA antenna current, again a about 6 dB stronger signal. The current experiment will stop on Tuesday afternoon. Results can be expected in the end of the next week. 73, Stefan/DK7FC