Airborne Transponder Equipment Air traffic control radar beacon system

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a light aircraft transponder


the transponder has small required set of controls , simple operate. has method enter four-digit transponder code, known beacon code or squawk code, , control transmit ident, done @ controller s request (see spi pulse below). transponders typically have 4 operating modes: off, standby, on (mode-a), , alt (mode-c). on , alt mode differ in on mode inhibits transmitting altitude information. standby mode allows unit remain powered , warmed inhibits replies, since radar used searching aircraft , exact location of aircraft.







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