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190 - ATPL - Airborne weather radar systems use a wavelength of approximately 3 cm in order to:

Question 190 - Radio Navigation - ATPL - Airline Transport Pilot license

Obtain optimum use of the cosecant squared beam
Transmit at a higher pulse repetition frequency for extended range
Detect the smaller cloud formations as well as large
Detect the larger water droplets

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