Acknowledgements

Thanks are due to Jim and Sybil McBrearty, for love and support in this; Eric Pressley and John Charlton, from whom I have learnt a great deal; all the staff at Butterworth-Heinemann for making the book a reality; William L. Bahn for helping me to convice myself that tuned circuits really should do what they do; and Hilary and Fi for putting up with my moods while I wrote!