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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
E2E
E2E11
E2E11:
What is the difference between direct FSK and audio FSK?
Direct FSK applies the data signal to the transmitter VFO, while AFSK transmits tones via phone
Direct FSK occupies less bandwidth
Direct FSK can transmit faster baud rates
Only direct FSK can be decoded by computer
E2E01
E2E02
E2E03
E2E04
E2E05
E2E06
E2E07
E2E08
E2E09
E2E10
E2E11
E2E12
E2E13