For assistance with HackRF general use or development, please look at the issues on the GitHub project.This is the preferred place to ask questions so that others may locate the answer to your question in the future. It is therefore of pretty limited use for most purposes - the only system I’m aware of that attempts to make use of Mode A/C is planeplotter which has some kind of mlat that uses it, as well as their beamfinder system which relies on knowing radar head locations and rotation rates. Before asking for help with HackRF, check to see if your question is listed in the FAQ. A passive listener has to do a lot of inference and guesswork to decide which is which and to what aircraft they apply. They are both 12 bit replies to an interrogation, and the only way to tell them apart for sure is to be the interrogating radar where you know which one was asked for. The problem with receiving it passively is that there is no difference between mode A and mode C messages. Mode A/C is much more limited - mode A is a response giving the aircraft’s squawk setting and mode C is the altitude response. PlanePlotter from COAA Time Management Software, Radios, Raspberry Pi Projects. Mode A/C is a separate system that operates alongside mode S. Ham Radio, Ads, Electronics, Projects, Log Projects, Blue. Besides not being useful and not counted by FA website… isn’t the Mode-S DF 20 and 21 actually the mode A/C?ĭF20 and 21 are CommB.
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