The ARRL Handbook for Radio Communications, 101st Edition
by ARRL Inc. · ARRL — The National Association for Amateur Radio
The structural anchor for the topic: it teaches how radios work, not how to pass a test. The national association's reference volume on radio electronics: components, analog and digital circuit theory, RF techniques, modulation, receivers and transmitters, power supplies, propagation, safety and test equipment, with construction projects. Revised roughly annually and used well beyond the licence syllabus.
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