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 x5PJafOu002390 for ; Tue, 25 Jun 2019 21:36:43 +0200 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1hfrAu-0004yz-SG for rs_out_1@blacksheep.org; Tue, 25 Jun 2019 20:32:16 +0100 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1hfrAa-0004yq-Tt for rsgb_lf_group@blacksheep.org; Tue, 25 Jun 2019 20:31:56 +0100 Received: from sonic314-14.consmr.mail.bf2.yahoo.com ([74.6.132.124]) by relay1.thorcom.net with esmtps (TLSv1.2:ECDHE-RSA-AES256-GCM-SHA384:256) (Exim 4.92) (envelope-from ) id 1hfrAY-0000bF-U7 for rsgb_lf_group@blacksheep.org; Tue, 25 Jun 2019 20:31:55 +0100 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=aol.com; s=a2048; t=1561491112; bh=KqWaiw+BO4rpFFIX9cCuBhBFtNB7qA2uJqzzJO4yMdg=; h=Date:From:To:In-Reply-To:References:Subject:From:Subject; b=BG058rhmojBTr4a69P23wYx5P3IOc8Vlx4JulbwLeaIycYcVIYoyoubmfD8nVgQIEqWlz0GYtDeAQddvRb/UDtLer4KZo2Vsloba53Y2LDQCrF18VjEnkVScRQIhTyAAgtqHfb8REmwcut6+wmDGER8jF01Oz62aZoUv0lWdd6C6x9Wy/z1MR0lwNcqK/f4fwFfUTH2BUD0gcY2DacCve50xaCHkJA6W93oeWEAReW8thrQzVx7ElxZXoPHSaF7O9u0bvB0d4AQm1Io5xOJDdhu+Lp85YUYv0L0HezMiiK4ZTo6NsWJcefHcCfHa3Y5XKwFqQV+tOHZ0ONPKEransg== X-YMail-OSG: B6nIR3QVM1kO0QjmRrdukJe3bubRpqPatwrR0gcUS37WF4dNvt9VlUvi6DCESEB nrL__QwShpdJwaZ9U3PyINLTsq7MLhhZBzEcV909BifWMTeyFHmkOXhBQsVOZhBWkdw9wcaghUz2 A3B7OGBFY_IUiZlhnHXn2AyrMCYsoG4awHNvHvFlP71jNwDefydmGYwpo01iSk2yVbB7BcFF6Xeh wotvjT.P42sh_RUFWrLLn9VI13M_DNlTRdtuWMTT_3WXmmqaNcrRLsfSMUUpuE5kZTyu9ge0as2f 9TVd6XNnqpf4_xGkHK9rXdOXgZoOdw8sDjE5IJ4z375OK8mWPZLv.w1p2qPBE7H_wp.JuaCELL2h 2eeo1xN1YRbqyFIA99Pa8cv6rOVsNHqIv3dS0afsGAbK3e1DCcXH2r4_qqI04ctZ0L24mzassHbC _qyfDGQFbGJ7hXUzSSdINLBn5f0rVTzjWQsGAyL_D_9rUMjZkjfpi5VUCFX8OO6VUCtJ77Co0Li7 H87v5ZmP2iQQ_pdq9YF0FAQuv.aLsq6ju9qd.YJ3_fdnAGMxl3ilBIBkCR5gxItkXWaXXZreT53d 0okWUIWVZRH3YF_AUf949_ZTqN0LIaEisX.H3qgu5h2OPVwc34XhgDsPZm9_bfEKDuFT66RodZlk .C.A_QKpHH56bNPOsv2oxXM2kLtnnCaZcPjDqrqUbTIQn.gDSWWgueEVUIQRAtNKTH1dgMefQidX GrWpBJxj5jAl6zIf2BjfK.r79f_IM5nFmoNXwGkeBsSE5Ff4vuqUZN.ztrWE_GonD1LmxctDVf8d HuXNfNIJbLUhjJv4waGFbuPpn6AQIETROROh_uP5SH044DjnC53GXpVxfffWOu29XjKvMu11m0ja 5VOFqF1w7D9Yi5xG95XtX1IuK0zy4cvLy0XCUHmBoI1ZBb32q6jvgeVfNrX34i4PdR6VDsluyiAy FHJ4d5GI_.qpwHumPa9FUhFPrDv_0D6RoTZQCEG2TyjfUaGUHeeolJB7nkxkIGenHaoUCdj6wNkq 9x2Y5PzIRLyyA7nXoA15POvahY502VDpJEA_yKxVcrQOO2LustM_rAhcaptA.D8u.rAGH9RTvZyM HEpIPH.NWAlqCeBXvLqdm2cRfdRY6LJCuV8.GJF1J4nQ7VDgf9zaWLpngsWICKcaPDrX1yAu7ddX 2Kw-- Received: from sonic.gate.mail.ne1.yahoo.com by sonic314.consmr.mail.bf2.yahoo.com with HTTP; Tue, 25 Jun 2019 19:31:52 +0000 Date: Tue, 25 Jun 2019 19:31:48 +0000 (UTC) From: Markus Vester To: rsgb_lf_group@blacksheep.org Message-ID: <689441781.1158818.1561491108266@mail.yahoo.com> In-Reply-To: <5D1268E1.9020500@posteo.de> References: <9ec649ed-7852-89b8-cb0e-d646de9538a9@rtv5.cz> <5D124169.1080309@posteo.de> <5D1268E1.9020500@posteo.de> MIME-Version: 1.0 X-Mailer: WebService/1.1.13837 aolwebmail Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/75.0.3770.100 Safari/537.36 X-Spam-Score: -0.2 (/) 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 @@CONTACT_ADDRESS@@ for details. Content preview: Hi Stefan, good work! You chose the best time of the day, producing nice bright dots in the DL0AO 424 uHz spectrograms, estimated SNR up to 25 dB SNR on 8270 and close to 30 dB on 5170 Hz. I'm curio [...] Content analysis details: (-0.2 points, 5.0 required) pts rule name description ---- ---------------------- -------------------------------------------------- -0.0 RCVD_IN_DNSWL_NONE RBL: Sender listed at http://www.dnswl.org/, no trust [74.6.132.124 listed in list.dnswl.org] -0.0 SPF_PASS SPF: sender matches SPF record 0.0 FREEMAIL_FROM Sender email is commonly abused enduser mail provider (markusvester[at]aol.com) 0.0 HTML_MESSAGE BODY: HTML included in message -0.1 DKIM_VALID_EF Message has a valid DKIM or DK signature from envelope-from domain -0.1 DKIM_VALID Message has at least one valid DKIM or DK signature 0.1 DKIM_SIGNED Message has a DKIM or DK signature, not necessarily valid -0.1 DKIM_VALID_AU Message has a valid DKIM or DK signature from author's domain X-Scan-Signature: 131286aabc28dd54c072e5e89638c651 Subject: Re: ULF/VLF: amateur stair case / carrier transmissions Content-Type: multipart/alternative; boundary="----=_Part_1158817_1760293488.1561491108264" X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: *** X-Spam-Status: No, hits=3.5 required=5.0 tests=FORGED_MUA_MOZILLA,HTML_30_40, 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 ------=_Part_1158817_1760293488.1561491108264 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable Hi Stefan, good work! You chose the best time of the day, producing nice bright=C2=A0d= ots in the DL0AO=C2=A0424 uHz spectrograms, estimated SNR up to 25 dB SNR o= n 8270 and close to 30 dB on 5170 Hz. I'm curious what you will derive from= the recordings. Best 73,Markus (DF6NM) -----Urspr=C3=BCngliche Mitteilung----- Von: DK7FC An: rsgb_lf_group Verschickt: Di, 25. Jun. 2019 20:35 Betreff: ULF/VLF: amateur stair case / carrier transmissions Hi all, Today, some 20 minute long carrier transmissions were drone from JN39WI=20 again. The main intention was to calibrate my local RDF spectrogram=20 (still to be done) in the range below 16.4 kHz (JXN) and above 82 Hz=20 (ZEVS). So that was a amateur radio ULF/VLF staircase somehow, despite=20 the weak signal strength relative to commercial transmitters. It was a hot day! Far > 30 C here. I started early in the morning and=20 enjoyed the fresh air in the forest. The DC resistance of the 1130m ground loop increased to 73.2 Ohm=20 (measured at 1 A) due to the dry soil. It confirms the dependency shown=20 in the last year! In 2018 i saw the resistance rising up to 94 Ohm in=20 late October, then it dropped to 57 Ohm (-40 %) in just 2 months. It was interesting to see that the antenna current is much higher at=20 lower frequencies (always at resonance | the PA output voltage is nearly=20 constant). This effect was very clearly expressed. IF of interest for other stations (having a data storage): Frequency/Hz=C2=A0 =C2=A0 Start time/UTC=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 = =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 Antenna current/A 970.005=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 2019-06-25_08:36:20,+20m= =C2=A0 =C2=A0 2.26 2970.005=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 2019-06-25_08:13:30,+20m=C2=A0 = =C2=A0 2.19 5170.005=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 2019-06-25_07:51:00,+20m=C2=A0 = =C2=A0 2.09 8270.005=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 2019-06-25_07:23:00,+25m=C2=A0 = =C2=A0 1.85 end of the official part. BTW, since a few days, the VLF RX site at DL0AO has a 3 axis VLF=20 receiver recording data from a Octo-soundcard and a Raspberry pi 3,=20 saving data to a 4 TB HDD so there is one more station that won't miss=20 anything from now on (for example unannounced transmissions by SAQ). Some spectrograms may be shown later. Evetually there was a problem with the sample rate correction due to the=20 upheating car, which caused a high deviation of the tracked sample rate.=20 The max allowed range of 10 ppm was left in the end of the experiment=20 but this was noticed a bit late, maybe. 73, Stefan ------=_Part_1158817_1760293488.1561491108264 Content-Type: text/html; charset=UTF-8 Content-Transfer-Encoding: quoted-printable
Hi Stefan,

good work! You chose the best tim= e of the day, producing nice bright dots in the DL0AO 424 uHz spe= ctrograms, estimated SNR up to 25 dB SNR on 8270 and close to 30 dB on 5170= Hz. I'm curious what you will derive from the recordings.

Best 73,
Markus (DF6NM)


-----Urspr=C3=BCngliche Mi= tteilung-----
Von: DK7FC <selberdenken@posteo.de>
An: rsgb_lf_g= roup <rsgb_lf_group@blacksheep.org>
Verschickt: Di, 25. Jun. 2019 = 20:35
Betreff: ULF/VLF: amateur stair case / carrier transmissions
Hi all,

Today= , some 20 minute long carrier transmissions were drone from JN39WI
again. The main intention was to calibrate my local RDF spectrog= ram
(still to be done) in the range below 16.4 kHz (JXN)= and above 82 Hz
(ZEVS). So that was a amateur radio ULF= /VLF staircase somehow, despite
the weak signal strength= relative to commercial transmitters.

= It was a hot day! Far > 30 C here. I started early in the morning and enjoyed the fresh air in the forest.
The DC resistance of the 1130m ground loop increased to 73.= 2 Ohm
(measured at 1 A) due to the dry soil. It confirms= the dependency shown
in the last year! In 2018 i saw th= e resistance rising up to 94 Ohm in
late October, then i= t dropped to 57 Ohm (-40 %) in just 2 months.

It was interesting to see that the antenna current is much higher= at
lower frequencies (always at resonance | the PA outp= ut voltage is nearly
constant). This effect was very cle= arly expressed.

IF of interest for oth= er stations (having a data storage):

F= requency/Hz    Start time/UTC          &= nbsp;             Antenna current/A
970.005            2019-06-25_08:36= :20,+20m    2.26
2970.005      &= nbsp;   2019-06-25_08:13:30,+20m    2.19
5= 170.005          2019-06-25_07:51:00,+20m  &n= bsp; 2.09
8270.005          2019= -06-25_07:23:00,+25m    1.85
end of the officia= l part.


BTW, since = a few days, the VLF RX site at DL0AO has a 3 axis VLF
re= ceiver recording data from a Octo-soundcard and a Raspberry pi 3,
saving data to a 4 TB HDD so there is one more station that won't= miss
anything from now on (for example unannounced tran= smissions by SAQ).

Some spectrograms m= ay be shown later.

Evetually there was= a problem with the sample rate correction due to the
up= heating car, which caused a high deviation of the tracked sample rate.
The max allowed range of 10 ppm was left in the end of the e= xperiment
but this was noticed a bit late, maybe.


73, Stefan



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