This category covers 25 topics and has 132 questions.

• Maximum Theoretical Range
• E Vs. H Waves
• Current Type
• Wave Polarisation
• Aviation Polarisation
• Radio Wave Basics
• Physical Processes
• Physical Processes 2
• C = F Λ
• Frequency Bands
• Wave Speed
• Frequency Propagation Type
• Space Wave Propagation
• The Ionosphere
• Sky Wave Interference
• Wave Propagation Method
• Phase Comparison
• Beacon Range
• Modulation
• Modulation Graphs
• Modulation Types
• ITU Modulation Codes
• Polar Diagrams
• Aerials
• Doppler Effect