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=FREEMAIL_FORGED_FROMDOMAIN, FREEMAIL_FROM,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 v02KSU5M019961 for ; Mon, 2 Jan 2017 21:28:31 +0100 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1cO99p-00007M-Db for rs_out_1@blacksheep.org; Mon, 02 Jan 2017 20:24:37 +0000 Received: from [195.171.43.34] (helo=relay2.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1cO99o-00007D-OP for rsgb_lf_group@blacksheep.org; Mon, 02 Jan 2017 20:24:36 +0000 Received: from resqmta-ch2-03v.sys.comcast.net ([2001:558:fe21:29:69:252:207:35]) by relay2.thorcom.net with esmtps (TLSv1.2:ECDHE-RSA-AES256-GCM-SHA384:256) (Exim 4.87) (envelope-from ) id 1cO99m-0007Xl-2I for rsgb_lf_group@blacksheep.org; Mon, 02 Jan 2017 20:24:35 +0000 Received: from resomta-ch2-19v.sys.comcast.net ([69.252.207.115]) by resqmta-ch2-03v.sys.comcast.net with SMTP id O97IccXvfMppVO97JcPyLd; Mon, 02 Jan 2017 20:22:01 +0000 X-DKIM-Result: Domain=comcast.net Result=Signature OK DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=comcast.net; s=q20161114; t=1483388521; bh=Bqaj3rD3VweoFOBcakkYfIw658Kzpu3Y/NFKI1nOCCA=; h=Received:Received:From:To:Subject:Date:Message-ID:MIME-Version: Content-Type; b=BVO2wPgPevtJ9Lr4888dyWOr6FsEILhgz7o+tRsoudOht2+FNndHihU7Sqa+Gtblq 6aQpFGAzS4xa/QoFYsaawc2brHpGoABIauYG3Bss+3MYE5+IuD2ZphsdiXS8OASyJC ci6cDoupda6G7FMWeBME0PXUp7ZE/D/FPzUytVOSqAfdXUSXhACwFG1EO7cmo5HCaL FY64E5WPLlhjrpBSQt6g/ia01jFjucpIPdTCUQFoHCepi5dMoE7DlXNqV1UVlb2u6U QuWaQGib7tTAPpLSQus2lTdx8peecIgSo0krWZYSqjEXaZweaJny+i44Ybw6fuelAg vezZ5EKCxNB8A== Received: from Owner ([IPv6:2601:141:0:bec5:307b:b267:b5e3:98ea]) by resomta-ch2-19v.sys.comcast.net with SMTP id O97HcFzfUJrREO97IcDO2T; Mon, 02 Jan 2017 20:22:01 +0000 From: To: 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> <586AA7C5.8070802@abelian.org> In-Reply-To: <586AA7C5.8070802@abelian.org> Date: Mon, 2 Jan 2017 15:21:58 -0500 Message-ID: <049501d26535$dee8b370$9cba1a50$@comcast.net> MIME-Version: 1.0 X-Mailer: Microsoft Outlook 14.0 Thread-Index: AQHRhrWNJyxyDm/RcmgHwLSrpxM9jAJ5P2AlAmcy39AB+99K5AJVTiwNAugb3cOgxo2bcA== Content-Language: en-us X-CMAE-Envelope: MS4wfEFd/OYot21mJ5rKiYVo0tw4zDPM8v6v3X3SaWmfwA1mlzzJQHojDs3DRQXh90qXKJ2Uu2XeqkopWGkuMg2Hhnz38pyAusJVahJ/0INa3aOp20ZAOwT8 h8PRVJ8nM8y5Y6y+TtH8Pjyzlex0ljI8iL4= X-Scan-Signature: 1c38f63d01970a2bf149f660c9cb2a37 Subject: RE: VLF: Back on 5.17 kHz / 58 km... Content-Type: text/plain; charset="utf-8" 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 Content-Transfer-Encoding: 8bit X-MIME-Autoconverted: from quoted-printable to 8bit by lipkowski.org id v02KSU5M019961 Status: RO X-Status: X-Keywords: X-UID: 10079 Paul and Stefan, Nice work, including parameters and modeling. Was the LWPC TX antenna angle parameter fairly close to actual angle? 73, Jim AA5BW -----Original Message----- From: owner-rsgb_lf_group@blacksheep.org [mailto:owner-rsgb_lf_group@blacksheep.org] On Behalf Of Paul Nicholson Sent: Monday, January 2, 2017 2:20 PM To: rsgb_lf_group@blacksheep.org Subject: Re: VLF: Back on 5.17 kHz / 58 km... 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 --