Return-Path: Received: from mtain-dk04.r1000.mx.aol.com (mtain-dk04.r1000.mx.aol.com [172.29.180.8]) by air-md05.mail.aol.com (v129.10) with ESMTP id MAILINMD053-8b864dcd6858d4; Fri, 13 May 2011 13:20:24 -0400 Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by mtain-dk04.r1000.mx.aol.com (Internet Inbound) with ESMTP id 589C238000208; Fri, 13 May 2011 13:20:22 -0400 (EDT) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1QKw1A-00088I-6M for rs_out_1@blacksheep.org; Fri, 13 May 2011 18:19:12 +0100 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1QKw19-000889-M6 for rsgb_lf_group@blacksheep.org; Fri, 13 May 2011 18:19:11 +0100 Received: from mhost02c.leeds.ac.uk ([129.11.76.154]) by relay1.thorcom.net with esmtp (Exim 4.63) (envelope-from ) id 1QKw17-0007nK-7r for rsgb_lf_group@blacksheep.org; Fri, 13 May 2011 18:19:11 +0100 Received: from APOLLO2.ds.leeds.ac.uk (apollo2.leeds.ac.uk [129.11.5.5]) by mhost02c.leeds.ac.uk (8.14.4/8.14.4) with ESMTP id p4DHJ3OO028788 (version=TLSv1/SSLv3 cipher=AES128-SHA bits=128 verify=NOT) for ; Fri, 13 May 2011 18:19:03 +0100 (BST) Received: from HERMES8.ds.leeds.ac.uk ([fe80::c078:16b5:73cf:6fbc]) by APOLLO2.ds.leeds.ac.uk ([129.11.5.5]) with mapi; Fri, 13 May 2011 18:19:02 +0100 From: Chris Trayner To: "rsgb_lf_group@blacksheep.org" Date: Fri, 13 May 2011 18:19:02 +0100 Thread-Topic: LF: RE: Ofcom Update: GPS Jamming Message Thread-Index: AcwRkdqbA6Z3QJrBScGMaLwZqaenLQ== Message-ID: <56336D02-1691-4257-8F19-C05E32BF24A2@leeds.ac.uk> References: In-Reply-To: Accept-Language: en-US, en-GB Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: acceptlanguage: en-US, en-GB MIME-Version: 1.0 X-Spam-Score: 0.0 (/) X-Spam-Report: autolearn=disabled,none Subject: Re: LF: RE: Ofcom Update: GPS Jamming Message Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable 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=TO_ADDRESS_EQ_REAL 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: 3039ac1db4084dcd68561037 X-AOL-IP: 195.171.43.25 X-AOL-SPF: domain : blacksheep.org SPF : none X-Mailer: Unknown (No Version) On 13 May 2011, at 18:05, Dave G3WCB. wrote: More info here, including a nice coverage map. 100w goes a loooong way... At least, when one realises that 120 nm means nautical miles, not nanometr= es ;-) Many of those long distances are at aircraft heights, where the jammer wil= l be line-of-sight. I remember hearing the first amateur radio from a Shut= tle: they were using about 2W on 2m, range nearly 1000km, and we picked it= up on a Slim Jim into an ordinary rig. Signal as clear as if it had been= from the next village. 73, Chris G4OKW ----------------------- Dr Chris Trayner School of Electronic & Electrical Engineering, The University of Leeds, Leeds LS2 9JT, United Kingdom Tel: +44 113 34 32053 Fax: +44 113 34 32032