Return-Path: Received: from rly-me05.mx.aol.com (rly-me05.mail.aol.com [172.20.83.39]) by air-me10.mail.aol.com (v125.7) with ESMTP id MAILINME104-9bb4ab4adf3226; Sat, 19 Sep 2009 06:10:13 -0400 Received: from post.thorcom.com (post.thorcom.com [193.82.116.20]) by rly-me05.mx.aol.com (v125.7) with ESMTP id MAILRELAYINME057-9bb4ab4adf3226; Sat, 19 Sep 2009 06:09:57 -0400 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1Mowsb-0001tw-BT for rs_out_1@blacksheep.org; Sat, 19 Sep 2009 11:09:21 +0100 Received: from [83.244.159.144] (helo=relay3.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1Mowsa-0001tn-Sg for rsgb_lf_group@blacksheep.org; Sat, 19 Sep 2009 11:09:20 +0100 Received: from smtp823.mail.ird.yahoo.com ([217.146.188.233]) by relay3.thorcom.net with smtp (Exim 4.63) (envelope-from ) id 1MowsR-0008W1-LH for rsgb_lf_group@blacksheep.org; Sat, 19 Sep 2009 11:09:13 +0100 Received: (qmail 33196 invoked from network); 19 Sep 2009 10:09:06 -0000 DomainKey-Signature: a=rsa-sha1; q=dns; c=nofws; s=s1024; d=btopenworld.com; h=Received:X-Yahoo-SMTP:X-YMail-OSG:X-Yahoo-Newman-Property:Message-ID:From:To:References:In-Reply-To:Subject:Date:MIME-Version:Content-Type:Content-Transfer-Encoding:X-Priority:X-MSMail-Priority:X-Mailer:X-MimeOLE; b=W6ddfmec0jdiyigj0OMb00/jLxsswUM+IpXQZZLrDqo2wPzJWo8OXXHubQYGMcElZn9rVw9MGKCAdjrRN/kW5pI3u2HmnNoyiEVXmcT0dR0ULou35JzRjTDMsgJjgO8fXM0Uml38xhLbc5gkcboi0NU5W5vPDCJ9SWeyXPlx4XQ= ; Received: from unknown (HELO JimPC) (james.moritz@86.176.84.176 with login) by smtp823.mail.ird.yahoo.com with SMTP; 19 Sep 2009 10:09:06 -0000 X-Yahoo-SMTP: qKIhhNCswBB2TTHr2BORWcGGR2mpopxhCcunGIxpCKQYiG07Q7UOhNo- X-YMail-OSG: Oqx7JZgVM1n8blbPgqnU8Evalyix0paLq6.gZtVzc0LPjD5s69btatYCKoyn2LiGyDRFhZzWTrPIM8rHVmbdA9SAFOxm_n2.5iBI6zCC7sAMARQDPVLkPuz9jdY8L6vWuWxHLtNzPgPKFagSn9XvUeFJwWSfo6BMxGgVdF_EuV4.vwGYeEimeyjD3w1B0yFq8CrAbdX1k6Qms9f7znamIA0wRZ1FaBz_R5UjFI9HQ9fvwOLk00WAfox8veVUbCGQnLjurFJj_tAGWeefmpVyqKI- X-Yahoo-Newman-Property: ymail-3 Message-ID: From: "James Moritz" To: References: In-Reply-To: Date: Sat, 19 Sep 2009 11:09:06 +0100 MIME-Version: 1.0 X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Windows Mail 6.0.6001.18000 X-MimeOLE: Produced By Microsoft MimeOLE V6.0.6001.18049 DomainKey-Status: good (testing) X-Spam-Score: 0.0 (/) X-Spam-Report: autolearn=disabled,none Subject: LF: Re: 500 still in use? Content-Type: text/plain; format=flowed; charset="iso-8859-1"; reply-type=original 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=0.1 required=5.0 tests=MISSING_OUTLOOK_NAME 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-IP: 193.82.116.20 Dear Laurence, LF Group, The 468kHz frequency does seem to be slated for Chinese Navtex broadcasts - apparently 424kHz is being used for Japanese language Navtex too. This seems to coincide with a general shift to using 490kHz for Navtex weather forecasts instead of "local language" as it was originally supposed to be. I beleive the international agreements relating to Navtex say that "no more than 1kW" should be used for Navtex broadcasts, and then only under exceptional circumstances, in order to minimise mutual QRM. but if you look at manufacturer's TX offerings, you will struggle to find one less than 1kW. Fun for DXers, I suppose, but not so clever when you actually need the info! Several years ago when a 500kHz allocation was first mooted, I spent some time listening to 500kHz, and most nights used to hear Italian coast stations - IAR was one I think. They would appear on 500k and tell you to QSY to some nearby frequency. When you did so they would broadcast a long list of ships' callsigns, I presume who they had traffic for. But I never did hear any 2-way operating, and got the impression the whole thing was computer generated. I haven't heard these coast stations since about 2003, or maybe before. Cheers, Jim Moritz 73 de M0BMU ----- Original Message ----- From: "Laurence BY3A-KL1X China" To: Sent: Saturday, September 19, 2009 9:40 AM Subject: LF: 500 still in use? Im asked whether 500kcs or kHz etc is still in use here and yes it is - heres a TTT TTT Nav warning on 500.00 Khz at Hr +18 from XSV Tianjin radio about 15 miles from me just a few mins ago. I dont hear Ship to Ship or Ship to Shore on MF, or should I say I havent yet and none of my ships or platforms are equipped here, but the Chinese announced back in 2007 that 486 Khz (assigned) is to be used for a "National language channel" - Im not sure if this relates to safety traffic/navtex or gen bsct - or whatever, but Tianjin is just increasing its output power on that freq to 5Kw, and dont I know it.