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[Applause] hi and welcome back to another tech minds video so in this video weamp;#39;re going to be discussing hfdl and how to decode it now hfdl is short for high frequency data link now hfdl is part of the a car system which works purely on high frequency now this is very similar to those a cars messages that we find on vhf and the inmarsat satellites hfdl supports aoc messages which is airline operational control it also supports cpdlc messages which is controller pilot data link communication and it also supports ads which is automatic dependent surveillance now the hf data link is used between aircraft aircraft or aircraft to ground station these hfdl transmissions are always found on upper sideband the modulation types can be 2 4 or 8 psk with variable brick rates consisting of either 300 600 1200 or 1800 bits per second now the frequencies that are used can vary depending on the time of day and location now here is a useful pdf document which shows you some of the popu
