Active TranspondersĪctive transponders are powered utilizing an internal battery and can transmit data continually using their own power source. Transponders operate through radio frequencies and can be either active or passive. The word was coined as a combination of the words "transmit" and "respond," which perfectly defines the purpose of the device. How Does a Transponder Work?Ī wireless monitoring, communications, or control device that detects and responds to a signal is called a transponder. A network can uplink its ground-based satellites to communications satellites orbiting the Earth, send multiple channels of digitally compressed video and audio to a single transponder aboard it, and local stations can then pick up the program and re-broadcast it locally by aiming the appropriate ground-based dish. Cellular phones use a similar, albeit smaller, chip to send the phone's location if it used to call an emergency number.Įven casual television viewing often involves the use of these devices. Some newer cars are also equipped with ones that operators can use to locate the vehicle in the event of an emergency.
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These are for roads that use electronic tolling systems that compute the amount of tolls to be paid and complete the transaction without requiring the driver to so much as lower his window. The modern commuter probably has at least one transmitter in his car, probably mounted on the windshield or dashboard. It may sound as if this is a technology that the average consumer never uses, but even if that was once the case, it no longer is. For example, sonar devices are used to mark underwater positions, calculate depth, and trace positions. They are also used to measure distance by calculating the elapsed time between the sending of the interrogator signal and the receipt of the transponder's signal. Transponders on commercial aircraft transmit their carrier and flight identification numbers to air traffic control centers. In aircraft applications, they are also configured to amplify the signal in order to make the plane more visible on radar.
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They receive a signal from the ground, and then automatically reply with an identification code for air traffic controllers, as well as altitude information. These devices are still common today in both military and commercial aviation.
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