3-73K6 B
What is the function of a commercial aircraft's SELCAL installation? SELCAL is a type of aircraft communications __________.
A. Device that allows an aircraft's receiver to be continuously calibrated for signal selectivity.
B. System where a ground-based transmitter can call a selected aircraft or group of aircraft without the flight crew monitoring the ground-station frequency.
C. Transmission that uses sequential logic algorithm encryption to prevent public "eavesdropping" of crucial aircraft flight data.
D. System where an airborne transmitter can selectively calculate the line-of-sight distance to several ground-station receivers.
