What frequency is used for ATCRBS interrogation signals?

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Multiple Choice

What frequency is used for ATCRBS interrogation signals?

ATCRBS, the secondary surveillance radar used by air traffic control, works by interrogating aircraft and receiving their transponder replies on different frequencies to keep questions and answers separate. The interrogator sends its signal on 1030 MHz, and the aircraft’s transponder responds on 1090 MHz with encoded data such as identity and altitude. The other frequencies listed don’t serve this interrogating role: 1090 MHz is reserved for replies, 121.5 MHz is an older emergency beacon channel, and 2.45 GHz is not used for ATCRBS.

ATCRBS, the secondary surveillance radar used by air traffic control, works by interrogating aircraft and receiving their transponder replies on different frequencies to keep questions and answers separate. The interrogator sends its signal on 1030 MHz, and the aircraft’s transponder responds on 1090 MHz with encoded data such as identity and altitude. The other frequencies listed don’t serve this interrogating role: 1090 MHz is reserved for replies, 121.5 MHz is an older emergency beacon channel, and 2.45 GHz is not used for ATCRBS.

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