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Amateur Extra Class: 2020–2024
Today
Sections
E1: Commission's Rules
E2: Operating Procedures
E3: Radio Wave Propagation
E4: Amateur Practices
E5: Electrical Principles
E6: Circuit Components
E7: Practical Circuits
E8: Signals and Emissions
E9: Antennas and Transmission Lines
E0: Safety
Quick Index
Practice Test
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Element 4
E2
E2A
E2A06
E2A06:
What are Keplerian elements?
Parameters that define the orbit of a satellite
Phase reversing elements in a Yagi antenna
High-emission heater filaments used in magnetron tubes
Encrypting codes used for spread spectrum modulation
E2A01
E2A02
E2A03
E2A04
E2A05
E2A06
E2A07
E2A08
E2A09
E2A10
E2A11
E2A12
E2A13