![]() The main default channel is at 136.975 MHz, but channels could exist on other air band frequencies too. ![]() The advantage over ACARS is that VDL2 can transmit data 10 times faster, and supports a much wider range of services. VDL2 is an evolution of ACARS and is eventually supposed to replace it entirely. The VHF Data Link mode 2 (VDL2) is a relatively new wireless transmission mode used on aircraft for sending short messages, position data (similar to ADS-B) and also for allowing traffic controllers to communicate to pilots via text and data.
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