Chapter One is an introductory chapter outlining why various types of equipment are used, illustrated with two case histories. Chapter Two describes all types of device available, their performance and potential uses. The remainder of the book deals with actual circuit diagrams and construction techniques of various transmitters, recording switches and counter surveillance devices, and provides information on receiving equipment. Paul Brookes has written several articles for magazines such as Practical Electronics, Everyday Electronics and Electronics Today International. For many years he designed, manufactured and retailed electronic kits for hobbyists specialising in radio communication and security devices.





