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 vB3DSnwx016538 for ; Sun, 3 Dec 2017 14:28:51 +0100 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1eLUEp-0002Mj-A2 for rs_out_1@blacksheep.org; Sun, 03 Dec 2017 13:23:19 +0000 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1eLUEa-0002Ma-3x for rsgb_lf_group@blacksheep.org; Sun, 03 Dec 2017 13:23:04 +0000 Received: from omr-m011e.mx.aol.com ([204.29.186.11]) by relay1.thorcom.net with esmtps (TLSv1:DHE-RSA-AES256-SHA:256) (Exim 4.89) (envelope-from ) id 1eLUEW-0005SU-FW for rsgb_lf_group@blacksheep.org; Sun, 03 Dec 2017 13:23:02 +0000 Received: from mtaomg-aak01.mx.aol.com (mtaomg-aak01.mx.aol.com [172.27.2.227]) by omr-m011e.mx.aol.com (Outbound Mail Relay) with ESMTP id 3342038000A5 for ; Sun, 3 Dec 2017 08:22:58 -0500 (EST) Received: from core-acc05a.mail.aol.com (core-acc05.mail.aol.com [172.26.125.15]) by mtaomg-aak01.mx.aol.com (OMAG/Core Interface) with ESMTP id A95F738000082 for ; Sun, 3 Dec 2017 08:22:57 -0500 (EST) Received: from 188.194.222.230 by webjas-vad046.srv.aolmail.net (10.96.35.49) with HTTP (WebMailUI); Sun, 03 Dec 2017 08:22:56 -0500 Date: Sun, 3 Dec 2017 08:22:57 -0500 From: Markus Vester To: rsgb_lf_group@blacksheep.org Message-Id: <1601c8b42aa-1725-6c6@webjas-vad046.srv.aolmail.net> In-Reply-To: <76ec2250-2206-1c8d-b775-d68f8978cacb@abelian.org> MIME-Version: 1.0 X-MB-Message-Source: WebUI X-MB-Message-Type: User X-Mailer: JAS STD X-Originating-IP: [188.194.222.230] x-aol-global-disposition: G DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=mx.aol.com; s=20150623; t=1512307378; bh=tjziAaopGpZHG9yiF18yvOJNSklz2J84Hy89HyMaCe4=; h=From:To:Subject:Message-Id:Date:MIME-Version:Content-Type; b=kPcnfhtlZClr6IFRz3ij1XeCpmSFDPFmSfSIFtsvtnWX6Ey2WkbbDQhglWj0ff9Rj M8ZzgoALsRwYCTNzPPl797qtJvCPgs+7ynEPPisnUbvNkzoSjhAqhhHlxR/imW8sq2 3NDI4cL8O63Zfg1U+XcCFKrLgdU9TRdADQGETmp8= x-aol-sid: 3039ac1b02e35a23fab1054f 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 Paul, superb! This is absolutely amazing work. We can now clearly see the southwesterly origin of nighttime QRN, presumably South America. A similar effect is apparent on the wideband twin cardioids at DL0AO, with generally higher noise background from the west than the east. I am wondering if we are seeing the nonreciprocity here, suppressing distant QRN from Asia more than from the Americas. But it might also be related to absorption over a land versus sea path. [...] Content analysis details: (0.0 points, 5.0 required) pts rule name description ---- ---------------------- -------------------------------------------------- -0.0 T_RP_MATCHES_RCVD Envelope sender domain matches handover relay domain 0.0 FREEMAIL_FROM Sender email is commonly abused enduser mail provider (markusvester[at]aol.com) 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: 5934134de2d93cab1d5fc440b67de82f Subject: Re: LF: W4DEX at 8270 Hz - and VO1NA Content-Type: multipart/alternative; boundary="----=_Part_2124_1571738249.1512307376809" X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: * X-Spam-Status: No, hits=1.1 required=5.0 tests=HTML_MESSAGE, MAILTO_TO_SPAM_ADDR 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_2124_1571738249.1512307376809 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable Hi Paul, superb! This is absolutely amazing work. We can now clearly see the southwesterly origin of nighttime QRN, presumabl= y South America. A similar effect is apparent on the wideband twin cardioid= s at DL0AO, with generally higher noise background from the west than the e= ast. I am wondering if we are seeing the nonreciprocity here, suppressing d= istant QRN from Asia more than from the Americas. But it might also be rela= ted to absorption over a land versus sea path. =20 Regarding the spectrogram implementation, three questions crossed my mind: - The directional lobe seems rather sharp (also on the old two-loop spectro= gram), slewing the pointer by say 45 =C2=B0 lets a signal completely disapp= ear. Linear cardioid magnitude=20 |B| =3D mu0 * | Ez/Z0 + Hx cos(phi) - Hy sin(phi) |=20 should be much smoother, so I presume you are calculationg brightness using= some nonlinear function of angle?=20 - What is the latency between the end of a one-hour buffer and the time the= latest spectrogram comes online? Could downconvert-and-decimate be used to= speed up FFT calculations for the narrow spectrogram? - For the three input channels, are you still using three separate stereo s= oundcards with individual timing corrections, or one of the newer multichan= nel soundcards (e.g. Octo on RasPi)? Best 73, Markus -----Urspr=C3=BCngliche Mitteilung-----=20 Von: Paul Nicholson An: rsgb_lf_group Verschickt: So, 3. Dez 2017 13:06 Betreff: Re: LF: W4DEX at 8270 Hz - and VO1NA Have a look at http://abelian.org/vlf/fbins2.shtml and swing the compass round to 280 degrees. I've made no alterations to the display settings other than to use 3-axis signals instead of 2-axis. Compare with the 2-axis spectrogram http://abelian.org/vlf/fbins.shtml to see the difference the extra channel makes. Still processing data in background to fill in the spectrogram. It will slowly back date to 2017-12-01 14:00, in batches, you'll have to refresh from time to time. It'll take a day or two to catch up. -- Paul Nicholson -- ------=_Part_2124_1571738249.1512307376809 Content-Type: text/html; charset=utf-8 Content-Transfer-Encoding: quoted-printable
Hi Paul,

superb! This is absolutely = amazing work.

We can now clearly see the southwesterly origin of nig= httime QRN, presumably South America. A similar effect is apparent on = the wideband twin cardioids at DL0AO, with generally higher noise backgroun= d from the west than the east. I am wondering if we are seeing the&nbs= p;nonreciprocity here, suppressing distant QRN from Asia more than fro= m the Americas. But it might also be related to absorption over a land= versus sea path.  

Regarding the spectrogram implementati= on, three questions crossed my mind:

- The directional lobe seems ra= ther sharp (also on the old two-loop spectrogram), slewing t= he pointer by say 45 =C2=B0 lets a signal completely disappear. L= inear cardioid magnitude 
  |B| =3D mu0 * | Ez/Z0 + Hx co= s(phi) - Hy sin(phi) |
should be much smoother, so I presume = you are calculationg brightness using some nonlinear function of angle= ? 

- What is the latency between the end of a one-hour buffer a= nd the time the latest spectrogram comes online? Could downconvert-and= -decimate be used to speed up FFT calculations for the narrow spectrog= ram?

- For the three input channels, are you still using three separ= ate stereo soundcards with individual timing corrections, or one of the new= er multichannel soundcards (e.g. Octo on RasPi)?

Best 73,
Markus<= br>
-----Urspr=C3=BCngliche Mitteilung-----
Von: Paul Nicholson <vlf0403@abelian.org>
An: rsgb_= lf_group <rsgb_lf_group@blacksheep.org>
Verschickt: S= o, 3. Dez 2017 13:06
Betreff: Re: LF: W4DEX at 8270 Hz - an= d VO1NA


Have a look= at

http://abelian.org/vlf/fbins2.sh= tml

and swing the compass round to 280= degrees.

I've made no alterations to the = display settings other
than to use 3-axis signals instead o= f 2-axis.

Compare with the 2-axis spectrog= ram

http://abelian.org/vlf/fbins.shtm= l

to see the difference the extra chan= nel makes.

Still processing data in backgr= ound to fill in the spectrogram.
It will slowly back date t= o 2017-12-01 14:00, in batches, you'll
have to refresh from= time to time. It'll take a day or two to
catch up.

--
Paul Nicholson
--


------=_Part_2124_1571738249.1512307376809--