1. The transponder emits a signal when it is interrogated by the secondary radar . 2. The FAA also established a secondary radar system ( ATCBI-5 ) on Saint Paul Island. 3. Air traffic control uses Primary and Secondary Radars . 4. Both primary and secondary radar are installed. 5. The information can be received by air traffic control ground stations as a replacement for secondary radar . 6. The ships will also receive an IFF upgrade, to the EADS MSSR 2000 I secondary radar system. 7. And a secondary radar could simply be disconnected . talk ) 23 : 08, 12 March 2014 ( UTC) 8. The radar unit is capable of identifying aircraft using secondary radar up to a radius and primary radar coverage to. 9. The curving lower reflector is the primary radar, while the flat antenna on top is the secondary radar . ]] 10. Secondary radar emits pulses and listens for special answer of digital data emitted by an Aircraft Transponder as an answer.
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