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In this, the first of the 2006 programme of IEE Lectures in Bournemouth, Radio Ham Paul Marsh describes how he built and used a home made receiver to sucessfully receive signals from NASA's Mars Reconnaissance Orbiter transmitting in X-band at a staggering range of 45 million miles from Earth
http://www.southgatearc.org/news/february2006/45million_miles.htm
http://www.southgatearc.org/news/february2006/45million_miles.htm