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Groups in US Amateur Radio - Amateur Extra (Element 4, 2016-2020)

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Subelement E1Commission's Rules
Subelement E2Operating Procedures
Subelement E3Radio Wave Propagation
Subelement E4Amateur Practices
Subelement E5Electrical Principles
Subelement E6Circuit Components
Subelement E7Practical Circuits
Subelement E8Signals and Emissions
Subelement E9Antennas and Transmission Lines
Subelement E0Safety