Return-Path: Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by mtain-mg03.r1000.mx.aol.com (Internet Inbound) with ESMTP id 1F5EC3800005C; Thu, 13 Sep 2012 04:18:40 -0400 (EDT) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1TC4bq-0002Xf-Hs for rs_out_1@blacksheep.org; Thu, 13 Sep 2012 09:17:14 +0100 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1TC4bq-0002XW-1Z for rsgb_lf_group@blacksheep.org; Thu, 13 Sep 2012 09:17:14 +0100 Received: from out1.ip04ir2.opaltelecom.net ([62.24.128.240]) by relay1.thorcom.net with esmtp (Exim 4.77) (envelope-from ) id 1TC4bo-0006fc-Ds for rsgb_lf_group@blacksheep.org; Thu, 13 Sep 2012 09:17:12 +0100 X-IronPort-Anti-Spam-Filtered: true X-IronPort-Anti-Spam-Result: AnkTAPSVUVBOk8v0/2dsb2JhbABFhgeELq0agyICfIEIghsFAQEEAQgBAQMWMwImBgEBAwUCAQMRBAEBAwIFIQICFAEEGgYWCAYTCgECAgEBh3YKqH+TH4EhiW+BSoFOgg2BEgONY5gbgmY X-IronPort-AV: E=Sophos;i="4.80,416,1344207600"; d="scan'208";a="384533456" Received: from host-78-147-203-244.as13285.net (HELO xphd97xgq27nyf) ([78.147.203.244]) by out1.ip04ir2.opaltelecom.net with SMTP; 13 Sep 2012 09:17:11 +0100 Message-ID: <002901cd9188$2c6a5bc0$0501a8c0@xphd97xgq27nyf> From: "mal hamilton" To: References: <66C690FA65054015B54D3DC3A6699556@AGB> <8CF5F1C3F556E0D-1A4C-500CE@webmail-d006.sysops.aol.com> <5050D7C3.2010005@legal-medicine.de> Date: Thu, 13 Sep 2012 08:17:10 -0000 MIME-Version: 1.0 X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2600.0000 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2600.0000 X-Spam-Score: 3.8 (+++) X-Spam-Report: Spam detection software, running on the system "relay1.thorcom.net", has identified this incoming email as possible spam. The original message has been attached to this so you can view it (if it isn't spam) or label similar future email. If you have any questions, see the administrator of that system for details. Content preview: The preferred modes for commercial operators is still CW and MSK on the LF/MF bands. Radio amateurs are trying to re-invent the Wheel only to end up with CW and MSK. Taking everything into consideration from generating electric to run the transmitters to the end traffic throughput. they are the most efficient because they use efficient class C, D and E amplifiers at 90% efficiency. Using modulators as add on gadgets to accommodate data modes is not an efficient approach. Data modes are fun modes they come in all sorts of varieties and disappear just as quickly. Who wants a mode that uses an amplifier at only 38% efficiency if you are lucky. de G3KEV [...] Content analysis details: (3.8 points, 5.0 required) pts rule name description ---- ---------------------- -------------------------------------------------- -0.0 RCVD_IN_DNSWL_NONE RBL: Sender listed at http://www.dnswl.org/, no trust [62.24.128.240 listed in list.dnswl.org] 0.4 FSL_XM_419 Old OE version in X-Mailer only seen in 419 spam -0.0 SPF_PASS SPF: sender matches SPF record 1.5 FSL_UA FSL_UA 1.9 AXB_XMAILER_MIMEOLE_OL_024C2 AXB_XMAILER_MIMEOLE_OL_024C2 X-Scan-Signature: 4e3b1488273adbbe9757d6bdd5adf219 Subject: Re: LF: slow WSPR? Content-Type: text/plain; charset="UTF-8" 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: 3039ac1d60cb505196e02b2d X-AOL-IP: 195.171.43.25 X-AOL-SPF: domain : blacksheep.org SPF : none The preferred modes for commercial operators is still CW and MSK on the LF/MF bands. Radio amateurs are trying to re-invent the Wheel only to end up with CW and MSK. Taking everything into consideration from generating electric to run the transmitters to the end traffic throughput. they are the most efficient because they use efficient class C, D and E amplifiers at 90% efficiency. Using modulators as add on gadgets to accommodate data modes is not an efficient approach. Data modes are fun modes they come in all sorts of varieties and disappear just as quickly. Who wants a mode that uses an amplifier at only 38% efficiency if you are lucky. de G3KEV ----- Original Message ----- From: "pws" To: Sent: Wednesday, September 12, 2012 6:43 PM Subject: Re: LF: slow WSPR? > Hi, > > Question: why do all those professional services for submarines > down at LF/VLF use MSK and not any kind of that advanced stuff > you are talking about? > > As far as I know they are using non-linear transmitters like my > cellphone does. > > Peter, df3lp > >