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81 - ATPL - A frequency of 10 GHz is considered to be the optimum for use in an airborne weather radar system because:

Question 81 - Radio Navigation - ATPL - Airline Transport Pilot license

The larger water droplets will give good echoes
Enables the aircraft to detect clear air turbulence
Static interference is minimised
Greater detail can be obtained at the more distant ranges of the smaller water droplets

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