Transponders make it much easier for air traffic controllers to keep track of the aircraft in their air space. Transponders transmit important information such as aircraft ID and altitude to ground radar stations.
Types of Radar Used
Air traffic control radar facilities use two types of radar. Primary radar, which has many limitations, basically bounces microwave pulses off objects and reads the echo. Secondary radar makes use of a transponder. The transponder responds to an interrogation from radar ground stations, relaying the airplane identification information and altitude.
Transponders have a number of different modes that respond with certain information. The majority of private planes have an A/C mode transponder. Mode A responds with the airplane identification number assigned to it by air traffic control. Mode C provides the altitude of the aircraft.
Mode S Transponders
Mode S transponders relay to the ground station not only a plane's altitude but the plane's aircraft address information assigned by the FAA as well. This aircraft address is a permanent designation that makes identifying the owner of a plane easier. Mode S transponders are more sophisticated and more expensive than a typical transponder.
Common Transponder Types
Mode A/C transponders are the most common models used in the United States. Mode S transponders were primarily used by the military in the past but are becoming much more common in private planes.
How to Make a Weather Station Model
Constructing a weather station model can be a satisfying experience, similar to learning a secret language. Weather enthusiasts see these station models...
How to Program a Toyota Transponder Chip Key
If you want to save about 75% on the price of a Toyota transponder chip key, you can buy the key and...
How to Program a Ford Focus Key
The Ford Focus uses two sets of instructions for programming the car's computer to obey remote controls' signals, depending on the car's...
How to Remove Transponder Key Coding
Transponder keys are used in vehicles that have computer chip programming within the vehicle. Typically, transponder keys are already programmed for your...
How to Test Transponder Car Keys
Transponder keys are specialized car keys used on vehicles with internal computer systems. The transponder key is specially programmed with the internal...
Aircraft Transponder Requirements
The U.S. Federal Aviation Administration (FAA) requires that all airplanes and other aircraft must be equipped with a transponder. A transponder is...