Delivered-To: daveyxm@virginmedia.com Received: by 10.50.142.105 with SMTP id rv9csp166580igb; Mon, 2 Jun 2014 14:10:15 -0700 (PDT) X-Received: by 10.194.175.106 with SMTP id bz10mr7644051wjc.96.1401743414479; Mon, 02 Jun 2014 14:10:14 -0700 (PDT) Return-Path: Received: from post.thorcom.com (post.thorcom.com. [195.171.43.25]) by mx.google.com with ESMTP id gq7si24037904wib.55.2014.06.02.14.10.13 for ; Mon, 02 Jun 2014 14:10:14 -0700 (PDT) Received-SPF: none (google.com: owner-rsgb_lf_group@blacksheep.org does not designate permitted sender hosts) client-ip=195.171.43.25; Authentication-Results: mx.google.com; spf=neutral (google.com: owner-rsgb_lf_group@blacksheep.org does not designate permitted sender hosts) smtp.mail=owner-rsgb_lf_group@blacksheep.org Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1WrZ5s-0006dT-Ox for rs_out_1@blacksheep.org; Mon, 02 Jun 2014 21:44:32 +0100 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1WrZ58-0006dI-Ln for rsgb_lf_group@blacksheep.org; Mon, 02 Jun 2014 21:43:46 +0100 Received: from parrot.netcom.co.uk ([217.72.171.49]) by relay1.thorcom.net with esmtp (Exim 4.82) (envelope-from ) id 1WrZ56-0008Qw-NB for rsgb_lf_group@blacksheep.org; Mon, 02 Jun 2014 21:43:45 +0100 Received: from sb.abelian.org (i-194-106-52-83.freedom2surf.net [194.106.52.83]) by parrot.netcom.co.uk (Postfix) with ESMTP id 93087327561 for ; Mon, 2 Jun 2014 21:40:22 +0100 (BST) Received: from [127.0.0.1] (localhost [127.0.0.1]) by sb.abelian.org (Postfix) with ESMTP id EC43B28A01FD for ; Mon, 2 Jun 2014 20:43:43 +0000 (UTC) Message-ID: <538CE1FF.1090002@abelian.org> Date: Mon, 02 Jun 2014 20:43:43 +0000 From: Paul Nicholson User-Agent: Mozilla/5.0 (X11; Linux i686; rv:17.0) Gecko/20130106 Thunderbird/17.0.2 MIME-Version: 1.0 To: rsgb_lf_group@blacksheep.org References: <538CD411.9000608@abelian.org> <538CDB90.5030702@freenet.de> In-Reply-To: <538CDB90.5030702@freenet.de> X-Spam-Score: 0.7 (/) X-Spam-Report: Spam detection software, running on the system "relay1.thorcom.net", has identified this incoming email as possible spam. The original message has been attached to this so you can view it (if it isn't spam) or label similar future email. If you have any questions, see the administrator of that system for details. Content preview: Wolf wrote: > do you have an estimation about how many percent of the > transmission time were actually 'blanked' due to sferics ? Yes, blanking factor is about 25%. Varies from hour to hour in the range 20% to 35% and not necessarily more at night. [...] Content analysis details: (0.7 points, 5.0 required) pts rule name description ---- ---------------------- -------------------------------------------------- -0.0 RCVD_IN_DNSWL_NONE RBL: Sender listed at http://www.dnswl.org/, no trust [217.72.171.49 listed in list.dnswl.org] 0.7 SPF_NEUTRAL SPF: sender does not match SPF record (neutral) X-Scan-Signature: 5c1f37c04fc013ebbc2288fd3791d043 Subject: Re: VLF: W4DEX trans-Atlantic at 8971 Hz 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=0.9 required=5.0 tests=FROM_ENDS_IN_NUMS 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 Wolf wrote: > do you have an estimation about how many percent of the > transmission time were actually 'blanked' due to sferics ? Yes, blanking factor is about 25%. Varies from hour to hour in the range 20% to 35% and not necessarily more at night. I combine E and H signals and steer the pattern, then apply blanking to the combined signal (as opposed to independent blanking of the three components before mixing). Blanking threshold is 1.2 times the moving mean amplitude. I think the default threshold in Spectrum Lab is a bit higher but the effect of that difference is very small. I band limit to 8970 +/- 1500 Hz before blanking. Much narrower and the sferics become stretched and blanking less effective. -- Paul Nicholson --