Return-Path: <owner-rsgb_lf_group@blacksheep.org>
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 w8LCdmtS011490
for <rlg@klubnl.pl>; Fri, 21 Sep 2018 14:39:53 +0200
Received: from majordom by post.thorcom.com with local (Exim 4.14)
id 1g3KdA-00005B-6V
for rs_out_1@blacksheep.org; Fri, 21 Sep 2018 13:33:56 +0100
Received: from [195.171.43.32] (helo=relay1.thorcom.net)
by post.thorcom.com with esmtp (Exim 4.14)
id 1g3Kd9-000052-CT
for rsgb_lf_group@blacksheep.org; Fri, 21 Sep 2018 13:33:55 +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 4.91_59-0488984)
(envelope-from <selberdenken@posteo.de>)
id 1g3Kd6-000062-Fc
for rsgb_lf_group@blacksheep.org; Fri, 21 Sep 2018 13:33:54 +0100
Received: from submission (posteo.de [89.146.220.130])
by mout02.posteo.de (Postfix) with ESMTPS id 1860F21104
for <rsgb_lf_group@blacksheep.org>; Fri, 21 Sep 2018 14:33:49 +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=1537533230; bh=RbAM8ZS5zg1covI+2SNmNZ5WUIZzxrRz0Rhgdw6yzKg=;
h=Date:From:To:Subject:From;
b=Kamt52Ero5Jol14LY9YToko7iYx7UbhsEvMpgQofWO6pASL+sG4aGCx9e+9TcmE2w
ue4Mx1SWttFieyk0a1Ullk2o/nOcXYup8kJzQvj2tm+WmhpT65fJt0TLTQqA/YFxBv
/N8biMx5zoDfn9EdAm3k/1we83Iluq+uwRgL3a7KRfle3c1wfvzMMdvvmiCBe1Ewwv
gVhr5nMwPr8bKtoapGFHXQoZbhYSq9bumAZONT9wyA3vwosHGodBsIMoSuFtv42iIh
qpNAo1R9b8Klklg9Lzl69+MGrIotONnRHIiajl6ckKAx9dx4eZQfSvQ3ASRaLkF4pO
rC0nGLbMaVmjA==
Received: from customer (localhost [127.0.0.1])
by submission (posteo.de) with ESMTPSA id 42GtLj0qvhz9rxF
for <rsgb_lf_group@blacksheep.org>; Fri, 21 Sep 2018 14:33:48 +0200 (CEST)
Message-ID: <5BA4E52C.6050007@posteo.de>
Date: Fri, 21 Sep 2018 14:33:48 +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
References: <6DB8451D7F3D3947A5918808A59621EA0863C3CF@servigilant.vigilant.local>
In-Reply-To: <6DB8451D7F3D3947A5918808A59621EA0863C3CF@servigilant.vigilant.local>
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
@@CONTACT_ADDRESS@@ for details.
Content preview: Hi VLF/ULF, Since two days i have an E-field receiver installed
on the tree. As usual, the spectrogram covers a range 0...24 kHz. The lower
cut off frequency of this new antenna seems to be arround 200 Hz, far better
than the loops i have installed at the moment (this will be improved too).
[...]
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 T_RP_MATCHES_RCVD Envelope sender domain matches handover relay
domain
0.0 T_DKIM_INVALID DKIM-Signature header exists but is not valid
X-Scan-Signature: 4e3b1488273adbbe9757d6bdd5adf219
Subject: VLF: E-field receiver 'on the tree'...
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
Content-Transfer-Encoding: 7bit
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=none 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
Hi VLF/ULF,
Since two days i have an E-field receiver installed on the tree. As
usual, the spectrogram covers a range 0...24 kHz. The lower cut off
frequency of this new antenna seems to be arround 200 Hz, far better
than the loops i have installed at the moment (this will be improved too).
There are some things to improve, like a better filtering of the ripple
on the 5 V supply (the DC/DC converter supplying the Raspi and other
receivers).
A first impression can be seen at
http://www.iup.uni-heidelberg.de/schaefer_vlf/DK7FC_VLF_Grabber2.html .
The upper window does now show the E field spectrogram. When clicking on
the image, it turns to the EW loop, then to the NS loop and then to the
RDF spectrogram which is still from the two loops only.
Actually i wanted to build an E field RX for VLF much earlier but other
projects were more prirised. But now, since having that large ground
loop antenna, allowing to operate below 1 kHz, i need a sensitive RX up
there. Thus the E field RX quickly rised to the top of the priority
list. And now it is there. So far it looks like the sensitivety at 970
Hz is excellent, at least relative to the loops.
Furthermore i do now have a 3 axis RX and the lossless compressed vtflac
stream is stored at 48 kS/s to a 1 TB HDD, covering about 40 days.
It will be interesting to see how the E field performs relative to the
combined loops, and how a cardioid antenna will increase the SNR even more.
A transmission on 970 Hz will follow in the near future.
73, Stefan