Return-Path: Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by klubnl.pl (8.14.4/8.14.4/Debian-8+deb8u2) with ESMTP id x35GKwnv018344 for ; Fri, 5 Apr 2019 18:21:00 +0200 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1hCRUn-0001Uj-PM for rs_out_1@blacksheep.org; Fri, 05 Apr 2019 17:15:13 +0100 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1hCRUN-0001UT-SS for rsgb_lf_group@blacksheep.org; Fri, 05 Apr 2019 17:14:47 +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 4.92) (envelope-from ) id 1hCRUK-0007vS-A0 for rsgb_lf_group@blacksheep.org; Fri, 05 Apr 2019 17:14:45 +0100 Received: from submission (posteo.de [89.146.220.130]) by mout02.posteo.de (Postfix) with ESMTPS id D5160240891 for ; Fri, 5 Apr 2019 18:14:41 +0200 (CEST) X-DKIM-Result: Domain=posteo.de Result=Signature OK DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=posteo.de; s=2017; t=1554480881; bh=cayyDvRUOIktjzDHvmB+A79xgRj3/DAeQtmC3t1q6w0=; h=Date:From:To:Subject:From; b=S7RP1HIiGHDgUh4YYvpFXncvBNJ2jj5lqneq3h4d5pRxd/wiU7l37xdVWSW+omxN1 kts2uwaaRmUA8Hl+noy8OYSYV06DLQwy7n/Wgdw17D9Y/ZfIM3naeZBEAav+atgH8z MmS8elF7M7p7w2QRIdrAkpe1D589Vmhs4LznmEFN+HPi5l4uWR7QmtlLIQkU8cxG51 5DBmmb5Ay5DgrjxmYmuI2ToeK476+kx52AtIoVkUj7x23fpzimCEClazICQ8Njajbs Lt6OBZCbLljl12S/XaTd/n+bDlS7FNa+d31VVloBAelts2yHytL+oPZGML5vT3WG1Y IfUgTCDkXdOdw== Received: from customer (localhost [127.0.0.1]) by submission (posteo.de) with ESMTPSA id 44bPz46LXdz9rxQ for ; Fri, 5 Apr 2019 18:14:39 +0200 (CEST) Message-ID: <5CA77EEF.6060600@posteo.de> Date: Fri, 05 Apr 2019 18:14:39 +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: <1235518182.17199593.1554475004043.ref@mail.yahoo.com> <1235518182.17199593.1554475004043@mail.yahoo.com> In-Reply-To: <1235518182.17199593.1554475004043@mail.yahoo.com> X-Spam-Score: -2.3 (--) X-Spam-Report: Spam detection software, running on the system "relay1.thorcom.net", has NOT identified this incoming email as spam. The original message has been attached to this so you can view it or label similar future email. If you have any questions, see the administrator of that system for details. Content preview: Hello Markus, VLF, ULF, Thanks for the todays tests and the good cooperation. Amazing what we can do meanwhile, watching smaller variations of the signal levels, which would not be possible from my large INV-L antenna becaus [...] Content analysis details: (-2.3 points, 5.0 required) pts rule name description ---- ---------------------- -------------------------------------------------- -2.3 RCVD_IN_DNSWL_MED RBL: Sender listed at http://www.dnswl.org/, medium trust [185.67.36.66 listed in list.dnswl.org] -0.0 SPF_PASS SPF: sender matches SPF record 0.0 HTML_MESSAGE BODY: HTML included in message X-Scan-Signature: e2fb1a5df1e2bc3146a6f486b4640b03 Subject: Re: VLF: Ground loop improvements and test carrier... Content-Type: multipart/alternative; boundary="------------080807080305010503070600" X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: X-Spam-Status: No, hits=0.0 required=5.0 tests=HTML_MESSAGE autolearn=no version=2.63 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 This is a multi-part message in MIME format. --------------080807080305010503070600 Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit Hello Markus, VLF, ULF, Thanks for the todays tests and the good cooperation. Amazing what we can do meanwhile, watching smaller variations of the signal levels, which would not be possible from my large INV-L antenna because we could not get such an SNR in that bandwidth. These were the transmissions today (+ some more parameters): T2019-04-05_10:39,+35m: 5170.1 Hz @1130m, I = 2,39 A, P = 461 W, C = 767 nF T2019-04-05_11:19,+51m: 5170.1 Hz @900m, I = 2,92 A, P = 566 W, C = 867 nF T2019-04-05_12:14:20,+10m: 970.1 Hz @900m, I= 3.09 A, P = 613 W, C = 10.2 uF T2019-04-05_12:30,+38m: 970.1 Hz @1130m, I = 2.49 A, P = 500W, C = 7 uF 73, Stefan Am 05.04.2019 16:36, schrieb Markus Vester: > At DL0AO, we produced spectrograms and plots during the 5.17 kHz test > last weekend. During the first session with the shorter > guiderail antenna, signficant fading and a dip occured, most > pronounced on the H-field receive antenna. Another deep dip happened > immediately after Stefan switched to the long antenna, however > that period may perhaps have been affected by a short retuning > interruption at 12:58. Considering around 17 dB SNR in 1.5 x 3.8 > mHz, the 6 dB variations seems to be too large to be explained by > random noise alone. Thus we have been speculating about ionospheric > variations or scintillations on a ten-minute timescale. Note > that no solar x-ray or SID event had happened at the time. > > Therefore I asked Stefan to repeat the test, which he did today, this > time starting on the long antenna (10:39 - 11:15) and then going > to the short one (11:19 - 12:10). This time the SNR was even better, > and only small variations occured, perfectly within the range of noise > statistics. > > Best 73, > Markus (DF6NM) > > > > -----Ursprüngliche Mitteilung----- > Von: DK7FC > An: rsgb_lf_group > Verschickt: Mi, 3. Apr. 2019 20:26 > Betreff: Re: VLF: Ground loop improvements and test carrier... > > PS: Earlier that day, the same test was done at 5170.1 Hz. But there, > the antenna current was different: > > 900m: T2019-03-31_12:31,+19m at I = 2.74 A > 1130m: T2019-03-31_12:57,+31m at I = 2.12 A --------------080807080305010503070600 Content-Type: text/html; charset=UTF-8 Content-Transfer-Encoding: 8bit Hello Markus, VLF, ULF,

Thanks for the todays tests and the good cooperation. Amazing what we can do meanwhile, watching smaller variations of the signal levels, which would not be possible from my large INV-L antenna because we could not get such an SNR in that bandwidth.

These were the transmissions today (+ some more parameters):
T2019-04-05_10:39,+35m: 5170.1 Hz @1130m, I = 2,39 A, P =  461 W, C = 767 nF
T2019-04-05_11:19,+51m: 5170.1 Hz @900m, I = 2,92 A, P = 566 W, C = 867 nF
T2019-04-05_12:14:20,+10m: 970.1 Hz @900m, I= 3.09 A, P = 613 W, C = 10.2 uF
T2019-04-05_12:30,+38m: 970.1 Hz @1130m, I = 2.49 A, P = 500W, C = 7 uF

73, Stefan



Am 05.04.2019 16:36, schrieb Markus Vester:
At DL0AO, we produced spectrograms and plots during the 5.17 kHz test last weekend. During the first session with the shorter guiderail antenna, signficant fading and a dip occured, most pronounced on the H-field receive antenna. Another deep dip happened immediately after Stefan switched to the long antenna, however that period may perhaps have been affected by a short retuning interruption at 12:58. Considering around 17 dB SNR in 1.5 x 3.8 mHz, the 6 dB variations seems to be too large to be explained by random noise alone. Thus we have been speculating about ionospheric variations or scintillations on a ten-minute timescale. Note that no solar x-ray or SID event had happened at the time.

Therefore I asked Stefan to repeat the test, which he did today, this time starting on the long antenna (10:39 - 11:15) and then going to the short one (11:19 - 12:10). This time the SNR was even better, and only small variations occured, perfectly within the range of noise statistics.

Best 73,
Markus (DF6NM)



-----Ursprüngliche Mitteilung-----
Von: DK7FC <selberdenken@posteo.de>
An: rsgb_lf_group <rsgb_lf_group@blacksheep.org>
Verschickt: Mi, 3. Apr. 2019 20:26
Betreff: Re: VLF: Ground loop improvements and test carrier...

PS: Earlier that day, the same test was done at 5170.1 Hz. But there, the antenna current was different:

900m: T2019-03-31_12:31,+19m at I = 2.74 A
1130m: T2019-03-31_12:57,+31m at I = 2.12 A
--------------080807080305010503070600--