Final answer:
ACARS data is transmitted via a dedicated VHF radio frequency designed for the digital communication system used by aircraft to exchange messages with ground stations.
Step-by-step explanation:
The radio that is dedicated to ACARS (Aircraft Communications Addressing and Reporting System) data is a data link radio. ACARS is a digital system used by aircraft to send and receive messages to and from ground stations. This system has its own dedicated VHF (Very High Frequency) radio frequency that is separate from the normal voice communication channels used by air traffic control and pilots.
The ACARS radios are programmed to automatically tune to the appropriate frequency needed for the geographical area the aircraft is flying over, using a network of ground stations. The system is critical for the exchange of messages related to the safety, operation, and maintenance of the aircraft.