I gratefully acknowledge the ready assistance following organizations: Andrew Ltd, Aspen Electronics Ltd, BBC, British Telecommunications plc, Farnell Instruments Ltd, Independent Television Authority, International Quartz Devices Ltd, Jaybeam Ltd, MACOM Greenpar Ltd, Marconi Instruments Ltd, Panorama Antennas Ltd, Radiocommunications Agency, the Radio Authority, RTT Systems Ltd. A special thanks goes to my wife Dorothy for once again putting up with my months of seclusion during the book’s preparation.
John Davies
offered by the xi