Return-Path: X-Spam-DCC: paranoid 1170; Body=2 Fuz1=2 Fuz2=2 X-Spam-Checker-Version: SpamAssassin 3.1.3 (2006-06-01) on lipkowski.org X-Spam-Level: X-Spam-Status: No, score=-2.0 required=5.0 tests=BAYES_00,DNS_FROM_AHBL_RHSBL, HTML_30_40,HTML_MESSAGE,SPF_PASS,UNPARSEABLE_RELAY autolearn=no version=3.1.3 Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by paranoid.lipkowski.org (8.13.7/8.13.7) with ESMTP id u4KDNGtl018447 for ; Fri, 20 May 2016 15:23:16 +0200 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1b3kJc-0005uY-4I for rs_out_1@blacksheep.org; Fri, 20 May 2016 14:18:08 +0100 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1b3kJb-0005uP-Lh for rsgb_lf_group@blacksheep.org; Fri, 20 May 2016 14:18:07 +0100 Received: from omr-m008e.mx.aol.com ([204.29.186.7]) by relay1.thorcom.net with esmtps (TLSv1:DHE-RSA-AES256-SHA:256) (Exim 4.87) (envelope-from ) id 1b3kJY-0002mw-ME for rsgb_lf_group@blacksheep.org; Fri, 20 May 2016 14:18:06 +0100 Received: from mtaomg-mbd01.mx.aol.com (mtaomg-mbd01.mx.aol.com [172.26.252.15]) by omr-m008e.mx.aol.com (Outbound Mail Relay) with ESMTP id CE62A38000BB for ; Fri, 20 May 2016 09:17:59 -0400 (EDT) Received: from core-acd03b.mail.aol.com (core-acd03.mail.aol.com [172.27.22.13]) by mtaomg-mbd01.mx.aol.com (OMAG/Core Interface) with ESMTP id 399263800008E for ; Fri, 20 May 2016 09:17:59 -0400 (EDT) Received: from 188.192.95.60 by webprd-a70.mail.aol.com (10.72.57.78) with HTTP (WebMailUI); Fri, 20 May 2016 09:17:59 -0400 Date: Fri, 20 May 2016 09:17:59 -0400 From: Markus Vester To: rsgb_lf_group@blacksheep.org Message-Id: <154ce50bf7a-15f0-3cdb@webprd-a70.mail.aol.com> In-Reply-To: <573EF90F.1080201@posteo.de> MIME-Version: 1.0 X-MB-Message-Source: WebUI X-MB-Message-Type: User X-Mailer: JAS STD X-Originating-IP: [188.192.95.60] x-aol-global-disposition: G DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=mx.aol.com; s=20150623; t=1463750279; bh=3Dto7DajePYhpOlTI6zLGEnABja56+/kxTkcDqMGKPw=; h=From:To:Subject:Message-Id:Date:MIME-Version:Content-Type; b=5kFfWuAwMjFUXWR2ssRFcmcW+0UybK79EI8GiPcy09LwuLaKOffjlhQxBv5F/Sdte lbwOWCFo/2ain1BNRrX8Ut5riM3pNDos7G1wzHa2YmdgzXynDK26zvsU9UFLZ9TmAo WnFipwth7c1pFBlziBzk7gMpe3qg+jINRbvRQwSI= x-aol-sid: 3039ac1afc0f573f0e87031b X-Scan-Signature: 6ffbd2c9950b634d6cc91f9565b01a8b Subject: VLF: Trying 6.47 kHz again Content-Type: multipart/alternative; boundary="----=_Part_20207_266390986.1463750279031" 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 2.56 on 10.1.3.11 Status: O X-Status: X-Keywords: X-UID: 8133 ------=_Part_20207_266390986.1463750279031 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 7bit Armed with more effective autonotch filter settings and Wolf's latest comb-notch option, I decided to have another go at receiving 6470 Hz. It looks like the railway QRM in the narrowband spectrograms has indeed gone down significantly. Of course with aggressive filtering and blanking there's always a risk to kill desired signal as well, throwing out the baby with the bathwater. As a check, I have added two artificial carriers at -110 dB target level (same as DL3NDR on 8.27 kHz). Stefan, if you like you could perhaps try another long 6.47 kHz carrier tomorrow or Sunday. If I can see it we mihght be able to compare daytime propagation patterns between the two frequency bands. Best 73, Markus http://www.df6nm.de/vlf/vlfgrabber.htm ------=_Part_20207_266390986.1463750279031 Content-Type: text/html; charset=utf-8 Content-Transfer-Encoding: quoted-printable
Armed with more effective autonotch filter settings and = Wolf's latest comb-notch option, I decided to have another go at receiving = 6470 Hz. It looks like the railway QRM in the narrowband spectrograms has i= ndeed gone down significantly. Of course with aggressive filtering and blan= king there's always a risk to kill desired signal as well, throwing out the= baby with the bathwater. As a check, I have added two artificial carriers = at -110 dB target level (same as DL3NDR on 8.27 kHz).

= Stefan, if you like you could perhaps try another long 6.47 kHz carrier tom= orrow or Sunday. If I can see it we mihght be able to compare daytime propa= gation patterns between the two frequency bands.

Best = 73,
Markus

http://www.df6nm.de/vlf/vlfgrabber.htm
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