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 wA63E5Z1011613 for ; Tue, 6 Nov 2018 04:14:11 +0100 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1gJrek-00016a-1O for rs_out_1@blacksheep.org; Tue, 06 Nov 2018 03:03:54 +0000 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1gJred-00016R-6R for rsgb_lf_group@blacksheep.org; Tue, 06 Nov 2018 03:03:47 +0000 Received: from resqmta-po-03v.sys.comcast.net ([2001:558:fe16:19:96:114:154:162]) by relay1.thorcom.net with esmtps (TLSv1.2:ECDHE-RSA-AES256-GCM-SHA384:256) (Exim 4.91_59-0488984) (envelope-from ) id 1gJreY-00023A-Od for rsgb_lf_group@blacksheep.org; Tue, 06 Nov 2018 03:03:45 +0000 Received: from resomta-po-04v.sys.comcast.net ([96.114.154.228]) by resqmta-po-03v.sys.comcast.net with ESMTP id Jpk8gjXGPep6JJreTg3OV6; Tue, 06 Nov 2018 03:03:37 +0000 X-DKIM-Result: Domain=comcast.net Result=Signature OK DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=comcast.net; s=q20161114; t=1541473417; bh=yxjTlVGdZg7eCJZi9ebM69g+qRsL9TGT8LlPzFhHP9w=; h=Received:Received:From:To:Subject:Date:Message-ID:MIME-Version: Content-Type; b=dscX/PvJ0iyiterClcHVF50i0fj0q3S1bHx0w0Gu7vcyy5K4x64Rkq4R+Y6sES9u9 87CwtdTchbLhVowpR/Mt1qjhj5MjIKgCKE2pZJ4a0zjeBPSqpzv/Ptf3jaBycmyMRJ r251SmT7GeaAY5ZjoUA9a7f53GjNGMt3ZDY1gFkhq3NtEuK//yJR2iDeyux5LxHnWU kT/HZml0aLzo/B+G3BOUUUmFUxihWYuQ8SLk0odOlD+vG6qogB31I8/A8/WIWPpr9K udvwXaYQdC6WcMqeyr/wMqxu16DNPwy/0LiGPrkNFgwkazNiLvYHo1jxnOBsgR7R/g 3xq8l6dCibgrA== Received: from Owner ([IPv6:2601:140:8500:7f9f:78f6:dd:b547:d008]) by resomta-po-04v.sys.comcast.net with ESMTPA id JreNgkgiPt0i6JreRgkpoN; Tue, 06 Nov 2018 03:03:36 +0000 From: To: References: <5BE0C0CE.10008@posteo.de> In-Reply-To: <5BE0C0CE.10008@posteo.de> Date: Mon, 5 Nov 2018 21:52:03 -0500 Message-ID: <055b01d4757d$4c552fc0$e4ff8f40$@comcast.net> MIME-Version: 1.0 X-Mailer: Microsoft Outlook 14.0 Thread-Index: AQHgdirWgwX/aRwQiLXxXwMjbK+3saUp83tQ Content-Language: en-us X-CMAE-Envelope: MS4wfGUZRVqYnFFmElcJ5nTum1YEnP4+UP0RIBocFzLnjSYFghOo6xWrYrU7s2xbq1W2ex6w5FwMS5vMKWzokxBrbAs2q/+ybYonLdP4P2nkrDyEcnOUCxYd 5u+sPuOnBXn2GdSmT+2/VbaLXuyFL1CvBNl7PULv4uwYItXHPiVsD1aNpiMRViBdfPrJ+Lch3UC7SmaTrqRJXIFyp5hDbhB20WviCUJ0mJROi/lTOauSq5ca X-Spam-Score: -0.7 (/) 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: Hello Stefan, Good SNR at 3.5 km on the 1110 km band makes this a noteworthy day! During your future SLF pre-tests, and in the future tests that you mentioned with the ground loop transmitter, will you be using the E-field tree receiver? [...] Content analysis details: (-0.7 points, 5.0 required) pts rule name description ---- ---------------------- -------------------------------------------------- -0.7 RCVD_IN_DNSWL_LOW RBL: Sender listed at http://www.dnswl.org/, low trust [2001:558:fe16:19:96:114:154:162 listed in] [list.dnswl.org] -0.0 T_RP_MATCHES_RCVD Envelope sender domain matches handover relay domain -0.0 SPF_PASS SPF: sender matches SPF record 0.0 FREEMAIL_FROM Sender email is commonly abused enduser mail provider (hvanesce[at]comcast.net) 0.0 HTML_MESSAGE BODY: HTML included in message 0.0 T_KAM_HTML_FONT_INVALID BODY: Test for Invalidly Named or Formatted Colors in HTML 0.0 T_DKIM_INVALID DKIM-Signature header exists but is not valid X-Scan-Signature: edae4bc128aa121544439b7b7cfd26a1 Subject: LF: RE: A first step on SLF Content-Type: multipart/alternative; boundary="----=_NextPart_000_055C_01D47553.638198C0" X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: X-Spam-Status: No, hits=0.5 required=5.0 tests=HTML_50_60,HTML_MESSAGE, NO_REAL_NAME 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 multipart message in MIME format. ------=_NextPart_000_055C_01D47553.638198C0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Hello Stefan, Good SNR at 3.5 km on the 1110 km band makes this a noteworthy day! During your future SLF pre-tests, and in the future tests that you mentioned with the ground loop transmitter, will you be using the E-field tree receiver? I've wondered if near-field polarizations and E/B ratios might be different than expected with the electrically-small transmitting antenna(s) in the ULF and SLF, including near trees. Your tree receiver SNR (~ 12dB at 424 uHz RBW, 3.5 km, 2.5ma) today seems to suggest that terrain-induced E-field/B-field transduction and polarization are not big factors; just wondering if you were planning to check your loop receiver also (but I think you mentioned that the loop would need modifications for SLF) Your 1110 km band signal well above QRM/QRN on your grabber for the past 5 hours is a great sight. 73, Jim AA5BW From: owner-rsgb_lf_group@blacksheep.org [mailto:owner-rsgb_lf_group@blacksheep.org] On Behalf Of DK7FC Sent: Monday, November 5, 2018 5:15 PM To: rsgb_lf_group@blacksheep.org Subject: SLF: A first step on SLF Well, today, i did a first step into the ITU radio band 2, SLF . Since 21:00 UTC i'm transmitting on the INV-L on 270.01 Hz. The antenna current is just 2.5 mA. The ERP is about 6 pW. Almost nothing but anyway a trace becomes visible now on my RX on the tree in 3.5 km distance (http://www.iup.uni-heidelberg.de/schaefer_vlf/DK7FC_VLF_Grabber2.html) Of course this is a near field experiment. There, on the 1110 km band, the far field begins at a distance of 177 km. On the transmitter site i'm using the modified 5 kV mains transformer that was used to produce 5 kV at 970 Hz. Now there is a series capacitor of about 20 uF applied to the primary winding. Together with internal reactances this maximises the peak of the fundamental frequency of the output voltage. The goal of this first experiment is just to put the foot into this part of the radio spectrum. And to do some pre-tests, trying to optimise filter and blanker settings for future tests. In the end i'm planning to work on that frequency from the ground loop antenna, which is still in the near field, but anyway :-) 73, Stefan ------=_NextPart_000_055C_01D47553.638198C0 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

Hello Stefan,

 

Good SNR at 3.5 km on the 1110 km band makes this a noteworthy = day!

 

During your future SLF pre-tests, and in the future tests that you = mentioned with the ground loop transmitter, will you be using the = E-field tree receiver?

 

I’ve wondered if near-field polarizations and E/B ratios might = be different than expected with the electrically-small transmitting = antenna(s) in the ULF and SLF, including near = trees.

 

Your tree receiver SNR (~ 12dB at 424 uHz RBW, 3.5 km, 2.5ma) today = seems to suggest that terrain-induced E-field/B-field transduction and = polarization are not big factors; just wondering if you were planning to = check your loop receiver also (but I think you mentioned that the loop = would need modifications for SLF)

 

Your 1110 km band signal well above QRM/QRN on your grabber for the = past 5 hours is a great sight.

 

73,

 

Jim AA5BW

 

 

 

 

 

 

From: owner-rsgb_lf_group@blacksheep.org = [mailto:owner-rsgb_lf_group@blacksheep.org] On Behalf Of = DK7FC
Sent: Monday, November 5, 2018 5:15 PM
To: = rsgb_lf_group@blacksheep.org
Subject: SLF: A first step on = SLF

 

Well, today, = i did a first step into the ITU radio band 2, SLF.
Since 21:00 UTC i'm transmitting on the INV-L on 270.01 Hz. The = antenna current is just 2.5 mA. The ERP is about 6 pW.
Almost nothing = but anyway a trace becomes visible now on my RX on the tree in 3.5 km = distance (http://www.iup.uni-heidelberg.de/schaefer_vlf/DK7FC_VLF_Grabber2.ht= ml)
Of course this is a near field experiment. There, on the = 1110 km band, the far field begins at a distance of 177 km. =

On the transmitter site i'm using the modified 5 kV mains = transformer that was used to produce 5 kV at 970 Hz. Now there is a = series capacitor of about 20 uF applied to the primary winding. Together = with internal reactances this maximises the peak of the fundamental = frequency of the output voltage.

The goal of this first = experiment is just to put the foot into this part of the radio spectrum. = And to do some pre-tests, trying to optimise filter and blanker settings = for future tests.
In the end i'm planning to work on that frequency = from the ground loop antenna, which is still in the near field, but = anyway :-)

73, Stefan

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