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=HEADER_FROM_DIFFERENT_DOMAINS, RCVD_IN_DNSWL_MED,SPF_PASS,T_DKIM_INVALID autolearn=ham autolearn_force=no version=3.4.0 X-Spam-DCC: : mailn 1480; 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+deb8u1) with ESMTP id v02JNekv019726 for ; Mon, 2 Jan 2017 20:23:42 +0100 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1cO88v-0007m3-IJ for rs_out_1@blacksheep.org; Mon, 02 Jan 2017 19:19:37 +0000 Received: from [195.171.43.34] (helo=relay2.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1cO88v-0007lu-8L for rsgb_lf_group@blacksheep.org; Mon, 02 Jan 2017 19:19:37 +0000 Received: from porthos.netcom.co.uk ([217.72.171.73]) by relay2.thorcom.net with esmtps (TLSv1.2:ECDHE-RSA-AES256-GCM-SHA384:256) (Exim 4.87) (envelope-from ) id 1cO88s-0007FP-L1 for rsgb_lf_group@blacksheep.org; Mon, 02 Jan 2017 19:19:36 +0000 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=HNTZYtjjHrsadufV9Y7uSMX1iO2MTgKafbFL4HhjTuM=; b=L7ECNCnaNFufIxCops9KXfLB3J XSpT3WAlhT8Pj8ab5k6mw8HnuAj8JZYOFxSJjzgugRvpMXIQIE8t2DGEUZzXJ6a8MrXz76jaB5iVo VXkytIb2ATzA748MUT3q5SyQNgbz8YS8Va3AIlAZgdSgMg6+OrpvzbAGK+Zulw5l00RU=; Received: from i-194-106-52-83.freedom2surf.net ([194.106.52.83]:53268 helo=pn.abelian.org) by porthos.netcom.co.uk with esmtpsa (TLSv1.2:ECDHE-RSA-AES256-GCM-SHA384:256) (Exim 4.87) (envelope-from ) id 1cO88s-0003cC-4w for rsgb_lf_group@blacksheep.org; Mon, 02 Jan 2017 19:19:34 +0000 Received: from [127.0.0.1] (localhost [127.0.0.1]) by pn.abelian.org (Postfix) with ESMTP id 8723F400373 for ; Mon, 2 Jan 2017 19:19:33 +0000 (UTC) To: rsgb_lf_group@blacksheep.org References: <159526aa32e-1297-2d056@webprd-m96.mail.aol.com> <5867AA75.6030603@posteo.de> <5867DFA9.5020604@abelian.org> <58691D84.9030201@posteo.de> <586A8A05.5090901@posteo.de> From: Paul Nicholson Message-ID: <586AA7C5.8070802@abelian.org> Date: Mon, 2 Jan 2017 19:19:33 +0000 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:38.0) Gecko/20100101 Thunderbird/38.8.0 MIME-Version: 1.0 In-Reply-To: <586A8A05.5090901@posteo.de> 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: 739d4fb39bd02fc5a2de5437a39bb056 Subject: Re: VLF: Back on 5.17 kHz / 58 km... 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: RO X-Status: A X-Keywords: X-UID: 10076 Stefan wrote: > f = 5170.000000 Hz > Start time: 02.Jan.2017 17:00:00 UTC > Symbol length: 40 s > Characters: 5 > CRC 16 > Coding 16K25A > Duration: 12h, 26m, 40s > Antenna current: ~ 200 mA Looks good. Last night the carrier 2017-01-01_17:00,+44800 at 5169.99975 Hz measured 0.135 fT but the signal is spread across 70uHz for some reason. It may decode at Eb/N0 between 3 to 5dB, hard to say. Allowing for perspective I tweaked the building separation to 45m and the height of the service rooms to 3.5m to get 412pF and effective height 13.1m. A little better but still a long way from 480pF. Rrad is about 160u ohms so expecting 6.3uW. LWPC says 0.088 fT daytime and 0.124fT nighttime. Measured: Daytime average 0.095fT, nightime 0.135fT I wouldn't rely on either LWPC or my measurements to better than +/-50% and that is probably generous. But it's nice to see we are in the right ballpark. -- Paul Nicholson --