to great acclaim at the 1963 Audio Fair in London, but interest from electronics firm Stuzzi did not lead to commercial development. Later career, legacy Fred was a great amateur radio enthusiast with his call sign G2BCX, and his innovative designs for the Slim Jim and ZL Special aerial antennas are still in use today. From the late 1970s, he operated from his home in Cantley, Norfolk. Towards the end of his life, he built several detailed reconstructions of early electrical devices including a Wimshurst machine and Edison phonograph. He was honoured by the University of East Anglia for constructing a working replica of apparatus used by Heinrich Hertz, but it seems that none of this equipment, the Chromasonics apparatus or his experimental music-making machinery has survived. However, starting in 2010 all of his remaining original quarter inch tapes have been catalogued and deposited with the British Library Sound Archive. In 2011, Judd was the focus of Practical Electronica, an experimental documentary by Ian Helliwell, covering Fred’s work with electronic sound and amateur tape recording. A retrospective album gathering together as much of his experimental music as can be located, is being released by the Public Information label. Books Radio control for model ships, boats and aircraft. London: Data publications, 1954. Electronic music and musique concrète. London : N. Spearman, 1961. Tape recording for everyone. Blackie, 1962. Radio and electronic hobbies. London: Museum Press, 1963. Circuits for audio and tape recording. Haymarket Press, 1966. Electronics in music. London: Spearman, 1972. Amateur radio. Newnes Technical Books, 1980. Two-metre antenna handbook. Newnes Technical, 1980. CB radio. Newnes Technical, 1982. Radio wave propagation : (HF bands). London : Heinemann, 1987. References, notes , a 2011 experimental documentary by Ian Helliwell sourced to Amateur Tape Recording magazine 1960–67 and Practical Electronics 1914 births 1992 deaths European amateur radio operators Inventors of musical instruments People from Cantley, Norfolk