Return-Path: Received: from mtain-dg11.r1000.mx.aol.com (mtain-dg11.r1000.mx.aol.com [172.29.65.19]) by air-mb08.mail.aol.com (v129.4) with ESMTP id MAILINMB082-a7d84cd44238157; Fri, 05 Nov 2010 13:43:20 -0400 Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by mtain-dg11.r1000.mx.aol.com (Internet Inbound) with ESMTP id 3D6B138000094; Fri, 5 Nov 2010 13:43:18 -0400 (EDT) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1PEQIQ-0001BZ-Lr for rs_out_1@blacksheep.org; Fri, 05 Nov 2010 17:41:50 +0000 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1PEQIQ-0001BQ-7N for rsgb_lf_group@blacksheep.org; Fri, 05 Nov 2010 17:41:50 +0000 Received: from mail-wy0-f171.google.com ([74.125.82.171]) by relay1.thorcom.net with esmtp (Exim 4.63) (envelope-from ) id 1PEQIO-0003zV-E4 for rsgb_lf_group@blacksheep.org; Fri, 05 Nov 2010 17:41:50 +0000 Received: by wyb39 with SMTP id 39so3210384wyb.16 for ; Fri, 05 Nov 2010 10:41:42 -0700 (PDT) Received: by 10.227.151.70 with SMTP id b6mr2309495wbw.205.1288978902134; Fri, 05 Nov 2010 10:41:42 -0700 (PDT) Received: from Win7Pro (5acf6241.bb.sky.com [90.207.98.65]) by mx.google.com with ESMTPS id b30sm1276218wbb.16.2010.11.05.10.41.38 (version=SSLv3 cipher=RC4-MD5); Fri, 05 Nov 2010 10:41:39 -0700 (PDT) From: Terry GW0EZY To: References: <0A4299B81A1F4A4A936D253AF4EFC75D@AGB> In-Reply-To: <0A4299B81A1F4A4A936D253AF4EFC75D@AGB> Date: Fri, 5 Nov 2010 17:41:37 -0000 Message-ID: <003b01cb7d10$b3554610$19ffd230$@com> MIME-Version: 1.0 X-Mailer: Microsoft Office Outlook 12.0 Thread-Index: Act86sib1OmBE3k5Q2iJOjecJeja4QAFp/lg Content-Language: en-gb X-Spam-Score: 0.9 (/) X-Spam-Report: autolearn=disabled,DNS_FROM_RFC_WHOIS=0.879 Subject: RE: IMO SYNOPTIC was Re: LF: The Wideband Noise Content-Type: text/plain; charset="us-ascii" 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=0.0 required=5.0 tests=none 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 x-aol-global-disposition: G x-aol-sid: 3039ac1d41134cd4423569dd X-AOL-IP: 195.171.43.25 X-AOL-SPF: domain : blacksheep.org SPF : temperror I guess these tests relate to a proposed new system being discussed in ITU Working Party 5B: PROPOSED MODIFICATIONS TO PRELIMINARY DRAFT NEW REPORT ITU-R M.[500 kHz] Utilization of the 495-505 kHz band by the maritime mobile service for the digital broadcasting (from shore-to-ships) of information related to safety and security The draft new report has contributions from France and USA. Some extracts from the documents: This preliminary draft Report provides information on a digital broadcasting system working in the 500 kHz band. This system is intended to be used to broadcast from shore to ships information related to navigational and meteorological warnings, urgent information and other information related to safety and security. The system will utilize the band 495-505 kHz and have the same coverage area as the current NAVTEX system operating at 490 kHz and 518 kHz. New digital technology provides a greatly improved data throughput from that provided by the current NAVTEX system. It also provides protection to the incumbent NAVTEX system. This system will operate in a manner similar to the current NAVTEX system. The coast stations will be spaced along the coast approximately [500] nautical miles apart. All the transmitters on a coast will share the 10 kHz channel by transmitting in a specific time slot. An example of time slot allocations for a network of 500 kHz broadcast transmitters for the Atlantic coast of Europe is based on 3-minute slots of a 60 minute cycle. There is also discussion on using 495-500 kHz and 500 - 505 kHz as two slots for a "permanent mode" The radiated power from the regional coast station transmitter should be what is sufficient to cover the intended service area of that coast station. The power would be decreased at night during periods of better r.f. propagation. The estimated coverage area from shore is approximately 320 nautical miles with a radiated power of 1 kW and 400 nautical miles with a radiated power of 5 kW. The modulation is of type OFDM with N-QAM. An example of 64-QAM @ 47.4 kbps.system has a data rate of 100 bit/second with a 300 Hz channel. This system would have a data rate of up to 47 400 bits/second with a 10 kHz channel. A transmitter site in France is mentioned in the report: Pointe de Corsen coordinates: 48.414444 N, 4.794444 W. Google Earth shows some sort of installation there. 73 Terry GW0EZY