Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on lipkowski.org X-Spam-Level: X-Spam-Status: No, score=-2.3 required=5.0 tests=FREEMAIL_FORGED_FROMDOMAIN, FREEMAIL_FROM,HEADER_FROM_DIFFERENT_DOMAINS,HTML_MESSAGE,RCVD_IN_DNSWL_MED, SPF_PASS,T_DKIM_INVALID autolearn=ham autolearn_force=no version=3.4.0 X-Spam-DCC: : mailn 1480; Body=3 Fuz1=3 Fuz2=3 Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by lipkowski.org (8.14.4/8.14.4/Debian-8+deb8u1) with ESMTP id v2QLuLOH012859 for ; Sun, 26 Mar 2017 23:56:22 +0200 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1csG6f-0008TG-Qa for rs_out_1@blacksheep.org; Sun, 26 Mar 2017 22:53:49 +0100 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1csG6f-0008T5-C9 for rsgb_lf_group@blacksheep.org; Sun, 26 Mar 2017 22:53:49 +0100 Received: from resqmta-ch2-07v.sys.comcast.net ([2001:558:fe21:29:69:252:207:39]) by relay1.thorcom.net with esmtps (TLSv1.2:ECDHE-ECDSA-AES256-GCM-SHA384:256) (Exim 4.89) (envelope-from ) id 1csG6c-0007xb-2e for rsgb_lf_group@blacksheep.org; Sun, 26 Mar 2017 22:53:48 +0100 Received: from resomta-ch2-08v.sys.comcast.net ([69.252.207.104]) by resqmta-ch2-07v.sys.comcast.net with SMTP id sG6Hc0fflU9z5sG6ZcvLd6; Sun, 26 Mar 2017 21:53:43 +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=1490565223; bh=L1uCMl1Uw9zngXWpH1iuc5dHN/+YBWdGymVH3JSlYCo=; h=Received:Received:From:To:Subject:Date:Message-ID:MIME-Version: Content-Type; b=K8vJvYipOvJomm3kWvCs2mh30MgKDae6ttpZxz06Z/qNdrOlxlcJwgurlWqR9Vbdd bO8Gy917mKLnJ572+HtqXw4K/4KPeLNA+YoKnWFx/+P/khOAG0PnzkhMa8q01D/aLm I2lEV4qHQ4Kg1pHGvG0NeI0IPSXkT4gwxJcztOz1XATj2qQgrlyuyDQK/fpfNGDPdr /eASdUHH1WaVRQQ2Q7S8VTbSJDw3JdPgqqdxvvamg8+p6huJY5u9/nVP5X4sOP+0Ey hv34t0XTdq/EjMkhF6eNX8Oaxj4mkwlZNFuEwko/itVphmwWB56ejVo8rAR3qhSKBQ EzrdSqscEeU8A== Received: from Owner ([IPv6:2601:140:8500:7f9f:51d2:150c:eb01:f540]) by resomta-ch2-08v.sys.comcast.net with SMTP id sG6YctNchtZO6sG6Zccdut; Sun, 26 Mar 2017 21:53:43 +0000 From: To: References: <93ae1c86-9b2e-8313-069f-8b0d941b49c8@abelian.org> <15b0c931d98-7d4f-1e43e@webprd-a90.mail.aol.com> In-Reply-To: <15b0c931d98-7d4f-1e43e@webprd-a90.mail.aol.com> Date: Sun, 26 Mar 2017 17:53:39 -0400 Message-ID: <00d601d2a67b$6e472430$4ad56c90$@comcast.net> MIME-Version: 1.0 X-Mailer: Microsoft Outlook 14.0 Thread-Index: AQGEk4+ydSDvSCCmGQr1u7Smz8OzTwIA8C14ojPIGNA= Content-Language: en-us X-CMAE-Envelope: MS4wfGodCHEvo8SD4LuhyEF/qnQ3vedbAhBxplNn2a4SSO3WlWH/RMe2DJysDHh+rPXpT/5fZio7w8vCdbTD632UvEpMjuvTPhJztgSKgomIwABAXqWtRVDo 1So8+2rk7Yk7loH0qOn6xPExDpvKq4NBqU4= X-Scan-Signature: e43fe7093e9b3ae0dc118eec4efba8a5 Subject: RE: LF: DK7FC in Todmorden at 2970 Hz Content-Type: multipart/alternative; boundary="----=_NextPart_000_00D7_01D2A659.E737F530" 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 X-Scanned-By: MIMEDefang 2.75 Status: RO X-Status: X-Keywords: X-UID: 11027 This is a multipart message in MIME format. ------=_NextPart_000_00D7_01D2A659.E737F530 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Well said =20 From: owner-rsgb_lf_group@blacksheep.org = [mailto:owner-rsgb_lf_group@blacksheep.org] On Behalf Of Markus Vester Sent: Sunday, March 26, 2017 5:44 PM To: rsgb_lf_group@blacksheep.org Subject: Re: LF: DK7FC in Todmorden at 2970 Hz =20 Congratulations Paul and Stefan, that is a very nice confirmation! > stacking 13:00 to 00:00=20 Interesting that this worked well, as it includes the sunset terminator, = and would typically be the time of highest QRN background on higher = frequencies. =20 > is normalised by the average power in a 20Hz bandwidth=20 I would think that a little more benefit could be achieved by further = downweighting the days with higher noise (gain factor -2 dB / 1 dB ). Still wondering who of you has spent more Joules on this, the = transmitter or the data processing on the receive side ;-) All the best, Markus -----Urspr=C3=BCngliche Mitteilung-----=20 Von: Paul Nicholson An: rsgb_lf_group Verschickt: So, 26. Mrz 2017 22:43 Betreff: LF: DK7FC in Todmorden at 2970 Hz Stefan wrote (10th March): > Since 16:56 UTC i'm running 180 mA antenna current > on (2970 + 7/(24*3600)) Hz, i.e. on 2970.000081 Hz After coherently stacking 13:00 to 00:00 for 9 days in a bandwidth of 25.25 uHz I get a clear signal at significance of around 5 sigma: http://abelian.org/vlf/tmp/170326a.png The peak has S/N 14.0 dB in 25.25uHz, which is -66 dB in 2.5kHz bandwidth. Signal azimuth is east with the expected phase angle between E and H antennas. The days used were 11th to 16th plus 18th to 20th. Attempting to include the 17th, or 21st to 23rd reduced the S/N. Leaving out any of the nine stacks days also reduces the S/N. The amplitude of each daily contribution is normalised by the average power in a 20Hz bandwidth around the signal frequency. No other bandwidth or daily time range produces a stronger peak. 14:00 to 19:00 in 55.5 uHz gives about 12dB S/N. So far, no attempt has been made to compensate for night time phase delay. Distance is 881.2 km, approximately 8.7 wavelengths. -- Paul Nicholson -- ------=_NextPart_000_00D7_01D2A659.E737F530 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable

Well said

 

From:= = owner-rsgb_lf_group@blacksheep.org = [mailto:owner-rsgb_lf_group@blacksheep.org] On Behalf Of Markus = Vester
Sent: Sunday, March 26, 2017 5:44 PM
To: = rsgb_lf_group@blacksheep.org
Subject: Re: LF: DK7FC in = Todmorden at 2970 Hz

 

C= ongratulations Paul and Stefan, that is a very nice = confirmation!

> stacking 13:00 to 00:00
Interesting that = this worked well, as it includes the sunset = terminator, and would typically be the time of highest QRN = background on higher frequencies.   

> is = normalised by the average power in a 20Hz bandwidth
I would think = that a little more benefit could be achieved by further = downweighting the days with higher noise (gain factor -2 dB / 1 dB = ).

Still wondering who of you has spent more Joules on this, the = transmitter or the data processing on the receive side = ;-)

All the best,
Markus

-----Urspr=C3=BCngliche = Mitteilung-----
Von: Paul Nicholson <vlf0403@abelian.org>
An: = rsgb_lf_group <rsgb_lf_group@blacksheep.org= >
Verschickt: So, 26. Mrz 2017 22:43
Betreff: LF: DK7FC in = Todmorden at 2970 Hz

<= br>Stefan wrote (10th March):

> Since 16:56 UTC i'm running = 180 mA antenna current
> on (2970 + 7/(24*3600)) Hz, i.e. on = 2970.000081 Hz

After coherently stacking 13:00 to 00:00 for 9 = days in a
bandwidth of 25.25 uHz I get a clear signal at = significance
of around 5 sigma:

http://abelian.org/vlf/tmp/170326a.png

The = peak has S/N 14.0 dB in 25.25uHz, which is -66 dB in
2.5kHz = bandwidth. Signal azimuth is east with the expected
phase angle = between E and H antennas.

The days used were 11th to 16th plus = 18th to 20th. Attempting
to include the 17th, or 21st to 23rd reduced = the S/N.
Leaving out any of the nine stacks days also reduces the = S/N.

The amplitude of each daily contribution is normalised = by
the average power in a 20Hz bandwidth around the = signal
frequency.

No other bandwidth or daily time range = produces a stronger
peak. 14:00 to 19:00 in 55.5 uHz gives about 12dB = S/N.

So far, no attempt has been made to compensate for night = time
phase delay.

Distance is 881.2 km, approximately 8.7 = wavelengths.

--
Paul = Nicholson
--

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