From absorption wavemeter to Zurich sunspot number, this single-volume, fully illustrated encyclopedia provides a practical overview of all topics related to amateur radio. Intended for ham radio operators, shortwave listeners, CBers, and electronics enthusiasts of all ages, this comprehensive reference supplies detailed information in a way that is accessible to those who need it most, beginners and would-be hobbyists. With 600 pages of alphabetically arranged, cross-referenced articles on more than 1000 topics, it should be a useful addition to any school or public library.