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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
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Element 4
E2
E2E
E2E03
E2E03:
How is the timing of FT4 contacts organized?
By exchanging ACK/NAK packets
Stations take turns on alternate days
Alternating transmissions at 7.5 second intervals
It depends on the lunar phase
E2E01
E2E02
E2E03
E2E04
E2E05
E2E06
E2E07
E2E08
E2E09
E2E10
E2E11
E2E12
E2E13