189 - ATPL - Modern low altitude radio altimeters emit waves in the following frequency band:

Question 189 - Aircraft General Knowledge - Instrumentation - ATPL - Airline Transport Pilot license

VLF (Very Low Frequency).
HF (High Frequency).
UHF (Ultra High Frequency).
SHF (Super High Frequency).

Training tests and timed exam simulations ATPL - Airline Transport Pilot license