4/10/2023 0 Comments Dsqweyuopk![]() For example, if the air traffic controller tells one plane to “Squawk 1234,” that number will appear on the radar scope. First, the transponder sends a signal to the radar that contains a four-digit squawk code. The transponder fixes all of these problems. Plus, all primary returns look the same, so there’s no way to tell which return belongs to which plane, beyond its location on a map. But it gives no indication of the target’s altitude. ![]() This basic radar blip is called a “primary return.” If the controller watches the primary return they can get an idea of speed and direction. Those returns on the scope show that there’s a plane there, but it can’t tell much about it. When the radar sweeps the sky, radio waves bounce off the aircraft and return to the station. The primary purpose of a transponder is to help controllers pick apart all the targets on their radar scopes. ![]() Instead, it creates a signal that only air traffic control (ATC) radar systems can see. What is a Transponder? How does it Work?Ī transponder is a radio in your avionics stack, but it isn’t used for voice communications. So this funny word is not just for the birds–pilots of all types of planes get to squawk, too. What says “squawk” and flies in the sky? Is it a parrot, a Cessna, or a 787? Or all three? Squawk is a common term used in air traffic control to describe a specific type of radio signal that comes from the plane’s transponder.
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