Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on lipkowski.org X-Spam-Level: X-Spam-Status: No, score=0.0 required=5.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, SPF_PASS,T_DKIM_INVALID autolearn=ham autolearn_force=no version=3.4.0 X-Spam-DCC: INFN-TO: mailn 1233; Body=2 Fuz1=2 Fuz2=2 Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by lipkowski.org (8.14.4/8.14.4/Debian-8+deb8u2) with ESMTP id v826u8eA020846 for ; Sat, 2 Sep 2017 08:56:10 +0200 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1do2Be-0001Dn-DH for rs_out_1@blacksheep.org; Sat, 02 Sep 2017 07:45:46 +0100 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1do29c-0001Dc-6l for rsgb_lf_group@blacksheep.org; Sat, 02 Sep 2017 07:43:40 +0100 Received: from porthos.netcom.co.uk ([217.72.171.73]) by relay1.thorcom.net with esmtps (TLSv1.2:ECDHE-RSA-AES256-GCM-SHA384:256) (Exim 4.89) (envelope-from ) id 1do29U-0004Wn-9k for rsgb_lf_group@blacksheep.org; Sat, 02 Sep 2017 07:43:33 +0100 X-DKIM-Result: Domain=abelian.org Result=Signature OK DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=abelian.org ; s=default; h=Content-Transfer-Encoding:Content-Type:In-Reply-To: MIME-Version:Date:Message-ID:From:References:To:Subject:Sender:Reply-To:Cc: Content-ID:Content-Description:Resent-Date:Resent-From:Resent-Sender: Resent-To:Resent-Cc:Resent-Message-ID:List-Id:List-Help:List-Unsubscribe: List-Subscribe:List-Post:List-Owner:List-Archive; bh=bzHVS08fUJ1y1GycjOh3aQ5tTKhc0CsPOFnIfwgngZA=; b=QKLxzNwIwV9pMacTUxvHlGcYW6 gs5gkuEdEgJUKKcNxbhiJvDgiCFBQ5qUO+2TpaN74FiDyzMRVIrYmQo45IU6Vc4Y2csjdVY6pqLLl b1KI9VFLGj9iAEwVOeymf1UeyeT1va4OZRmlZa1KRRVT3OEq5/Rw/2+LSIkjNJE6ZNCA=; Received: from i-194-106-52-83.freedom2surf.net ([194.106.52.83]:59325 helo=pn.abelian.org) by porthos.netcom.co.uk with esmtpsa (TLSv1.2:ECDHE-RSA-AES256-GCM-SHA384:256) (Exim 4.89) (envelope-from ) id 1do29R-0002oj-HX for rsgb_lf_group@blacksheep.org; Sat, 02 Sep 2017 07:43:29 +0100 Received: from [127.0.0.1] (localhost [127.0.0.1]) by pn.abelian.org (Postfix) with ESMTP id CE3A040002B for ; Sat, 2 Sep 2017 06:43:28 +0000 (UTC) To: rsgb_lf_group@blacksheep.org References: <15e3d8ac066-c0a-2fad5@webjas-vab092.srv.aolmail.net> From: Paul Nicholson Message-ID: Date: Sat, 2 Sep 2017 06:43:28 +0000 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:45.0) Gecko/20100101 Thunderbird/45.5.1 MIME-Version: 1.0 In-Reply-To: <15e3d8ac066-c0a-2fad5@webjas-vab092.srv.aolmail.net> X-AntiAbuse: This header was added to track abuse, please include it with any abuse report X-AntiAbuse: Primary Hostname - porthos.netcom.co.uk X-AntiAbuse: Original Domain - blacksheep.org X-AntiAbuse: Originator/Caller UID/GID - [47 12] / [47 12] X-AntiAbuse: Sender Address Domain - abelian.org X-Get-Message-Sender-Via: porthos.netcom.co.uk: authenticated_id: catchall@abelian.org X-Authenticated-Sender: porthos.netcom.co.uk: catchall@abelian.org X-Scan-Signature: f62c7cf8eeb8e5a327b71719e9bffff1 Subject: Re: VLF: E-field receivers in Todmorden Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: 7bit 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: O X-Status: X-Keywords: X-UID: 12501 Markus wrote: > maybe in the received signal level from the Alphas? > ... a bit of directivity due to environmental conditions I wonder. One curious fact supporting this is the noise blanker drop factor. This is the proportion of time the blanker is active. The drop factor is always a bit higher on the new rx than the old when I run the two signals through independent sferic blankers. The blanking threshold is set relative to the noise floor, which is tracked by an asymmetric moving average. The new rx must have a lower threshold to have a higher blanking factor, therefore vtblank is finding a lower floor (relative to the sferics) on the new rx compared with the old. So, the E-field probes are not quite omni-directional perhaps? I need to look at more signals, from different directions, to build a picture. -- Paul Nicholson --