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 v93JuwVg017913 for ; Tue, 3 Oct 2017 21:56:59 +0200 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1dzTD6-0002dO-MX for rs_out_1@blacksheep.org; Tue, 03 Oct 2017 20:50:32 +0100 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1dzTD4-0002dF-Nu for rsgb_lf_group@blacksheep.org; Tue, 03 Oct 2017 20:50:30 +0100 Received: from omr-a005e.mx.aol.com ([204.29.186.50]) by relay1.thorcom.net with esmtps (TLSv1:DHE-RSA-AES256-SHA:256) (Exim 4.89) (envelope-from ) id 1dzTCz-0004dX-R1 for rsgb_lf_group@blacksheep.org; Tue, 03 Oct 2017 20:50:29 +0100 Received: from mtaomg-aaf02.mx.aol.com (mtaomg-aaf02.mx.aol.com [172.26.127.100]) by omr-a005e.mx.aol.com (Outbound Mail Relay) with ESMTP id 4965438000AE for ; Tue, 3 Oct 2017 15:50:23 -0400 (EDT) Received: from core-ace06h.mail.aol.com (core-ace06.mail.aol.com [172.27.23.6]) by mtaomg-aaf02.mx.aol.com (OMAG/Core Interface) with ESMTP id B579938000081 for ; Tue, 3 Oct 2017 15:50:22 -0400 (EDT) Received: from 188.192.44.165 by webjas-vae239.srv.aolmail.net (10.96.23.242) with HTTP (WebMailUI); Tue, 03 Oct 2017 15:50:21 -0400 Date: Tue, 3 Oct 2017 15:50:22 -0400 From: Markus Vester To: rsgb_lf_group@blacksheep.org Message-Id: <15ee3ca0461-c0d-38c1@webjas-vae239.srv.aolmail.net> In-Reply-To: <59D2BD65.4080909@posteo.de> MIME-Version: 1.0 X-MB-Message-Source: WebUI X-MB-Message-Type: User X-Mailer: JAS STD X-Originating-IP: [188.192.44.165] x-aol-global-disposition: G DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=mx.aol.com; s=20150623; t=1507060223; bh=gZ8dUeOrR8mcszD2Irj3bmXEx0L5EzTmokuFEWj+C80=; h=From:To:Subject:Message-Id:Date:MIME-Version:Content-Type; b=SLDdfjPOWjHLFZexHJ5ANwkrkJ9XaWjJEsjkCfScv8B0al4XKyRtyp27XOz+JWTL5 gxC/aKM27bXpO76ja5oltzvntbaFUH1/NAdUH29IrC8BcUE5IUpu0Y3jwO2gzZHhwN cNAbjoXDEtjyX68/bzBND0mfoswr99dfmdRfYADI= x-aol-sid: 3039ac1a7f6459d3e9fe442f X-Spam-Score: 0.0 (/) 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: Hi Stefan, quite a solid signal on the DL0AO grabber! http://df6nm.bplaced.net/dl0ao/VLFgrabber/vlfgrabber_dl0ao_test.htm Despite lower ERP, daytime SNR appears to be much better than on 8270 Hz. This is presumably caused by a) stronger signal due to more favourable ground / skywave phasing at this distance, and b) lower noise due to lower radiated power from limited-length lightning discharges. [...] Content analysis details: (0.0 points, 5.0 required) pts rule name description ---- ---------------------- -------------------------------------------------- 0.0 FREEMAIL_FROM Sender email is commonly abused enduser mail provider (markusvester[at]aol.com) -0.0 RP_MATCHES_RCVD Envelope sender domain matches handover relay domain 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: c95b9a52470b89d54f2ef38e923e05cb Subject: Re: VLF: 300 mA on 6470 Hz Content-Type: multipart/alternative; boundary="----=_Part_18448_1189210644.1507060221025" 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 ------=_Part_18448_1189210644.1507060221025 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable Hi Stefan, quite a solid signal on the DL0AO grabber!=20 http://df6nm.bplaced.net/dl0ao/VLFgrabber/vlfgrabber_dl0ao_test.htm Despite lower ERP, daytime SNR appears to be much better than on 8270 Hz. T= his is presumably caused by a) stronger signal due to more favourable groun= d / skywave phasing at this distance, and b) lower noise due to lower radia= ted power from limited-length lightning discharges.=20 Good luck! Markus (DF6NM) -----Urspr=C3=BCngliche Mitteilung-----=20 Von: DK7FC An: rsgb_lf_group Verschickt: Di, 3. Okt 2017 0:29 Betreff: VLF: 300 mA on 6470 Hz Hi VLF, Since 22 UTC, a carrier with 300 mA antenna current is running at=20 6470.005 Hz. The ERP is about 50 uW. That's the next step in the series of experiments transmitting on=20 frequencies down to DC :-) The coil has 3 and 1/2 stacked buckets now. That gives about 1.3 H. It=20 was necessary to separate the upper and lower two buckets a bit more=20 than usually, otherwise the frequency was at 6223 Hz. I expect i will=20 reach 5170 Hz when the spacing is reduced to the normal value (70 mm)=20 and when i fully wind the upper bucket. Here's an image of the construction as it was used on 8270 Hz:=20 http://www.iup.uni-heidelberg.de/schaefer_vlf/VLF/8270_new_coil.jpg The=20 new construction uses one more of these buckets. They say there will be strong rain during the whole night. I don't yet=20 know how this will detune the antenna. Maybe the safety circuit tripps.=20 But if not, i intend to run the carrier for 24+ hours, so people can=20 check their grabbers and phase and so on :-) A first EbNaut message will follow during the week... 73, Stefan Am 02.10.2017 22:02, schrieb Jacek Lipkowski: > Stefan, thanks for the carrier, this helped me improve my grabber a bit. > > i've changed the time range in my grabber to 7 days, so that you can=20 > compare with your previous carrier, and also added a "normalised"=20 > spectrogram: > > https://klubnl.pl/wpr/en/index.php/klubnl-pl-grabbers/grabber-4-8270hz/ > > in the normalised spectrogram the average of relative powers for each=20 > timeperiod are normalised to a constant value. so this is something=20 > similar to AGC, taking care of day/night noise variations. i think=20 > Paul does something similat, because his spectrogram doesn't show=20 > differences in day/night noisefloor. > > the S/N isn't great, but this is from a simple e-field antenna in the=20 > middle of the city. > > i've also added a 6470Hz grabber for your next tests (and will add=20 > 5170Hz and normalized graphs in the future): > > https://klubnl.pl/wpr/en/index.php/klubnl-pl-grabbers/grabber-sq5bpf-6470= hz/=20 > > > VY 73 > > Jacek / SQ5BPF ------=_Part_18448_1189210644.1507060221025 Content-Type: text/html; charset=utf-8 Content-Transfer-Encoding: quoted-printable
Hi Stefan,

quite a solid signal on the = DL0AO grabber!
 http://df6nm.bplaced.net/dl0ao/VLFgrabber/vlfgrabb= er_dl0ao_test.htm
Despite lower ERP, daytime SNR appears to be = ;much better than on 8270 Hz. This is presumably caused by a) stronger=  signal due to more favourable ground / skywave phasing at this distan= ce, and b) lower noise due to lower radiated power from limited-l= ength lightning discharges. 

Good luck!
Markus (DF6NM)
-----Urspr=C3=BCngliche Mitteilung-----
Von: DK7FC <selberdenken@p= osteo.de>
An: rsgb_lf_group <rsgb_lf_group@blacksheep.org>
V= erschickt: Di, 3. Okt 2017 0:29
Betreff: VLF: 300 mA on 6470 Hz

<= /div>Hi VLF,

Since 22 UTC, a carrier with 300 mA antenna current is = running at
6470.005 Hz. The ERP is about 50 uW.
That's the next step= in the series of experiments transmitting on
frequencies down to DC :-= )

The coil has 3 and 1/2 stacked buckets now. That gives about 1.3 H= . It
was necessary to separate the upper and lower two buckets a bit mo= re
than usually, otherwise the frequency was at 6223 Hz. I expect i wil= l
reach 5170 Hz when the spacing is reduced to the normal value (70 mm)=
and when i fully wind the upper bucket.

Here's an image of the = construction as it was used on 8270 Hz:
http://w= ww.iup.uni-heidelberg.de/schaefer_vlf/VLF/8270_new_coil.jpg The
new= construction uses one more of these buckets.
They say there will be str= ong rain during the whole night. I don't yet
know how this will detune = the antenna. Maybe the safety circuit tripps.
But if not, i intend to r= un the carrier for 24+ hours, so people can
check their grabbers and ph= ase and so on :-)
A first EbNaut message will follow during the week...<= br>
73, Stefan


Am 02.10.2017 22:02, schrieb Jacek Lipkowski:<= br>> Stefan, thanks for the carrier, this helped me improve my grabber a= bit.
>
> i've changed the time range in my grabber to 7 days, = so that you can
> compare with your previous carrier, and also added= a "normalised"
> spectrogram:
>
> https://klubnl.pl/wpr/en/index.php/klubnl-pl-grabbers/grabber-4-8270h= z/
>
> in the normalised spectrogram the average of relativ= e powers for each
> timeperiod are normalised to a constant value. s= o this is something
> similar to AGC, taking care of day/night noise= variations. i think
> Paul does something similat, because his spec= trogram doesn't show
> differences in day/night noisefloor.
><= br>> the S/N isn't great, but this is from a simple e-field antenna in t= he
> middle of the city.
>
> i've also added a 6470Hz gr= abber for your next tests (and will add
> 5170Hz and normalized grap= hs in the future):
>
> https://= klubnl.pl/wpr/en/index.php/klubnl-pl-grabbers/grabber-sq5bpf-6470hz/ >
>
> VY 73
>
> Jacek / SQ5BPF

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