Return-Path: X-Spam-DCC: paranoid 1290; Body=2 Fuz1=2 Fuz2=2 X-Spam-Checker-Version: SpamAssassin 3.1.3 (2006-06-01) on lipkowski.org X-Spam-Level: X-Spam-Status: No, score=-1.4 required=5.0 tests=BAYES_00,DNS_FROM_AHBL_RHSBL, NO_REAL_NAME autolearn=no version=3.1.3 Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by paranoid.lipkowski.org (8.13.7/8.13.7) with ESMTP id t5IA2Jc3002224 for ; Thu, 18 Jun 2015 12:02:19 +0200 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1Z5WX9-00020X-7n for rs_out_1@blacksheep.org; Thu, 18 Jun 2015 10:54:55 +0100 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1Z5WX8-00020O-MB for rsgb_lf_group@blacksheep.org; Thu, 18 Jun 2015 10:54:54 +0100 Received: from lb2-smtp-cloud2.xs4all.net ([194.109.24.25]) by relay1.thorcom.net with esmtps (TLSv1:DHE-RSA-AES256-SHA:256) (Exim 4.85) (envelope-from ) id 1Z5WX6-0007O5-Vo for rsgb_lf_group@blacksheep.org; Thu, 18 Jun 2015 10:54:53 +0100 Received: from [192.168.178.20] ([83.162.220.82]) by smtp-cloud2.xs4all.net with ESMTP id hluo1q00H1nG4D701luqvZ; Thu, 18 Jun 2015 11:54:51 +0200 From: roelof@ndb.demon.nl To: DK7FC , rsgb_lf_group@blacksheep.org Date: Thu, 18 Jun 2015 11:54:48 +0200 MIME-Version: 1.0 Message-ID: <55829568.30271.3F9D87@roelof.ndb.demon.nl> In-reply-to: <55820A6E.2010401@posteo.de> References: <5581F953.3060200@posteo.de>, <5146574.123205.1434583108891.JavaMail.defaultUser@defaultHost>, <55820A6E.2010401@posteo.de> X-mailer: Pegasus Mail for Windows (4.70) Content-description: Mail message body X-Scan-Signature: 7aa9ad08848e488e22e0ff1d71f4ef1d Subject: Re: LF: MF propagation over sea water Content-type: text/plain; charset=US-ASCII 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 2.56 on 10.1.3.10 Status: O X-Status: X-Keywords: X-UID: 3499 Hello Stefan, About 10 years ago a couple of NDB chasers have been investigating this issue by comparing reception of NDB's over a sea path and a land path. To exclude sky wave propagation as good as possible, the tests were done in summer at the time of the sun's solstice. Though by no means a scientific research, it was found that the length of a sea path was up to four times the length of a land path! I live about 8 km from the sea wall here and my furthest daytime signal has been the now decommissioned NDB AB, Akraberg, Faroer, 1268 km away. There is another one on the Faroer, MY, Myggenaes, on 337 kHz, 1360 km away, which is still active. I could hear it at daytime by ear in the past. Unfortunately power seem to have been reduced as the carrier on 336.970 kHz is about 4 dB above my noise floor at the moment. 73, Roelof Bakker, pa0rdt