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 w8BI1pxo010147 for ; Tue, 11 Sep 2018 20:01:53 +0200 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1fzmtr-0005oi-50 for rs_out_1@blacksheep.org; Tue, 11 Sep 2018 18:56:31 +0100 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1fzmtP-0005oZ-Oo for rsgb_lf_group@blacksheep.org; Tue, 11 Sep 2018 18:56:03 +0100 Received: from resqmta-ch2-04v.sys.comcast.net ([2001:558:fe21:29:69:252:207:36]) by relay1.thorcom.net with esmtps (TLSv1.2:ECDHE-RSA-AES256-GCM-SHA384:256) (Exim 4.91_59-0488984) (envelope-from ) id 1fzmtN-0004vU-Jb for rsgb_lf_group@blacksheep.org; Tue, 11 Sep 2018 18:56:02 +0100 Received: from resomta-ch2-11v.sys.comcast.net ([69.252.207.107]) by resqmta-ch2-04v.sys.comcast.net with ESMTP id zhmUfh03clHCvzmtJf1yvI; Tue, 11 Sep 2018 17:55:57 +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=1536688557; bh=16zjlCVi7TFtOwUnepJ51h6/kaflcK91s/JFWutUyIU=; h=Received:Received:From:To:Subject:Date:Message-ID:MIME-Version: Content-Type; b=mptw13cZg6rrxBZe+1MpipWhD+45+tr60Dt1TXovvAeLxJJFnvLcQsUREkUfBGQZ6 L8YR8YThcVo8il4HPY1B6jiexSWmPuV0dzcIxFfJSg3h0xjo+bY8D0n9hxB6hzT6V1 9R4ZHKSLZh4eFQnu2di9/nRVdxWJxWm9p9KP2yKirfzpjfZYq8JHAb1BsqSruUC9pj 3L1H0UL/2v3RkaeqVKHPPH+QCd+MIU23sBlDDZpLIIdA0Btr7yt6biBw8mqA+16cTl hCUMSN5p1uwvAH5SFAegRn0AICliLFzz0jJRUZ0TlP42SQwtAKPalvbv0jRLkSa9EY /PhGmAfyTJH8w== Received: from Owner ([IPv6:2601:140:8500:7f9f:78f6:dd:b547:d008]) by resomta-ch2-11v.sys.comcast.net with ESMTPA id zmtHfq1B43RZDzmtIfzISp; Tue, 11 Sep 2018 17:55:57 +0000 From: To: References: <5B94344B.3030503@posteo.de> <165bb2c1d17-1ebb-76dc@webjasstg-vaa41.srv.aolmail.net> <005c01d448c3$ffd50480$ff7f0d80$@comcast.net> <5B966518.9050108@posteo.de> <5B97D71F.7080303@posteo.de> In-Reply-To: <5B97D71F.7080303@posteo.de> Date: Tue, 11 Sep 2018 13:55:52 -0400 Message-ID: <023a01d449f8$af13e260$0d3ba720$@comcast.net> MIME-Version: 1.0 X-Mailer: Microsoft Outlook 14.0 Thread-Index: AQJ8hoi9XVemPdMh1725juDHpoCQfwJjSrBnAeqj788CyxdmQQKhNz9bo00IUbA= Content-Language: en-us X-CMAE-Envelope: MS4wfGpmQwJ26smP2UAb4P7jTgyMv+vO6S+4NlTUzVHPrYYkYlnGPJWj2W9bYh3hA+rBd877xAt3zu2hhFmjxf1y9qfuFTS9uXDK5K5D+sgzXBCqAQGRuPQj LCD3cy5DbxolrAsJDeGHHG5xjYNV8bZDOWdwmfTwzYqYBJfOnRQPnrJZD+CphIuBPOqF//rzLStouTKLMCbLHdzhuw0vlDNstaKfTdzryYwFlzf9YO9X0nwR 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, Very interesting received-signal spectrum images! Last night I was wondering what the receive characteristics of your ground-loop antenna would be, so your scope spectrum images are a nice surprise. [...] 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:fe21:29:69:252:207:36 listed in] [list.dnswl.org] 0.0 FREEMAIL_FROM Sender email is commonly abused enduser mail provider (hvanesce[at]comcast.net) -0.0 SPF_PASS SPF: sender matches SPF record -0.0 T_RP_MATCHES_RCVD Envelope sender domain matches handover relay domain 0.0 T_KAM_HTML_FONT_INVALID BODY: Test for Invalidly Named or Formatted Colors in HTML 0.0 HTML_MESSAGE BODY: HTML included in message 0.0 T_DKIM_INVALID DKIM-Signature header exists but is not valid X-Scan-Signature: 6ae5fe68d6708d1e4a9cbdf0f0af43e5 Subject: RE: LF: Re: 137 kHz WSPR-2 on a 900m long ground loop, this weekend Content-Type: multipart/alternative; boundary="----=_NextPart_000_023B_01D449D7.2802DEA0" X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: X-Spam-Status: No, hits=0.8 required=5.0 tests=HTML_40_50,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_023B_01D449D7.2802DEA0 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Hello Stefan, =20 Very interesting received-signal spectrum images! Last night I was = wondering what the receive characteristics of your ground-loop antenna = would be, so your scope spectrum images are a nice surprise. =20 I looked particularly at the image of 100 kHz span, to see if there was = evidence of azimuth directionality, or preference for local (high = elevation angle) signals (for received signals). I could not see evidence of azimuth directionality or = high-elevation-angle preference, but I am not too familiar with the = bearing and ERP relationships of FTA, GQD, DHO38, (JXN?) and other = signals that I tried to identify. I thought I could see NAA (next to DHO38, at a relevant SNR for the = 101.73Hz? bandwidth) and NAU in your spectrum image, but not NML (which = was pre-dawn, not surprising to not see it). I interpreted this as = evidence of good low-angle sensitivity; but perhaps I didn=E2=80=99t = identify the transmitters correctly. =20 =20 Did you happen to notice any indication of azimuth directionality, or = preference for local (high elevation angle) signals, in your = received-signal spectra? =20 Thanks for posting the great images. =20 73, =20 Jim AA5BW =20 From: owner-rsgb_lf_group@blacksheep.org = [mailto:owner-rsgb_lf_group@blacksheep.org] On Behalf Of DK7FC Sent: Tuesday, September 11, 2018 10:54 AM To: rsgb_lf_group@blacksheep.org Subject: Re: LF: Re: 137 kHz WSPR-2 on a 900m long ground loop, this = weekend =20 LF/VLF/ULF,=20 Another thing to report. With the scope i took some spectra showing the = signal amplitudes of strong LF and VLF stations. The 900m long antenna = (grounded ends) was simply connected to the probe of the scope. Maybe = not the best resolution but it gives an idea of the signal voltages = measured at the feed point. A connected sound card would have to deal = with these voltages. The strongest signal is at about 180 kHz, obviously = Europe1 ,a = carrier and AM sidebands are visible. I'll try to receive ZEVS and the Schumanns from that antena soon. Spectra captures attached. 73, Stefan ------=_NextPart_000_023B_01D449D7.2802DEA0 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable

Hello Stefan,

 

Very interesting received-signal spectrum images! Last night I was = wondering what the receive characteristics of your ground-loop antenna = would be, so your scope spectrum images are a nice = surprise.

 

I looked particularly at the image of 100 kHz span, to see if there = was evidence of azimuth directionality, or preference for local (high = elevation angle) signals (for received signals).

I could not see evidence of azimuth directionality or = high-elevation-angle preference, but I am not too familiar with the = bearing and ERP relationships of FTA, GQD, DHO38, (JXN?) and other = signals that I tried to identify.

I thought I could see NAA (next to DHO38, at a relevant SNR for the = 101.73Hz? bandwidth) and NAU in your spectrum image, but not NML (which = was pre-dawn, not surprising to not see it). I interpreted this as = evidence of good low-angle sensitivity; but perhaps I didn=E2=80=99t = identify the transmitters correctly. = =C2=A0=C2=A0

 

Did you happen to notice any indication of azimuth directionality, or = preference for local (high elevation angle) signals, in your = received-signal spectra?

 

Thanks for posting the great images.

 

73,

 

Jim AA5BW

 

From: owner-rsgb_lf_group@blacksheep.org = [mailto:owner-rsgb_lf_group@blacksheep.org] On Behalf Of = DK7FC
Sent: Tuesday, September 11, 2018 10:54 = AM
To: rsgb_lf_group@blacksheep.org
Subject: Re: LF: = Re: 137 kHz WSPR-2 on a 900m long ground loop, this = weekend

 

LF/VLF/ULF, =

Another thing to report. With the scope i took some spectra = showing the signal amplitudes of strong LF and VLF stations. The 900m = long antenna (grounded ends) was simply connected to the probe of the = scope. Maybe not the best resolution but it gives an idea of the signal = voltages measured at the feed point. A connected sound card would have = to deal with these voltages. The strongest signal is at about 180 kHz, = obviously Euro= pe1,a carrier and AM sidebands are visible.
I'll try to receive = ZEVS and the Schumanns from that antena soon.
Spectra captures = attached.

73, Stefan

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