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Home > Exam Questions > ATPL - Airline Transport Pilot Licence > Radio Navigation > How does an aircraft DME receiver distinguish replies to its own interrogations from replies to other aircraft?

276 - ATPL Question Bank in English - How does an aircraft DME receiver distinguish replies to its own interrogations from replies to other aircraft?

Question 276 - Radio Navigation - ATPL - Airline Transport Pilot Licence

Pulse pairs are amplitude modulated with the aircraft registration

Aircraft interrogation signals and transponder responses are 63 MHz removed from each other

By matching replies at a consistent delay to its own randomly jittered sequence of interrogation pulse pairs; the interval within each pair is not an aircraft identifier.

Transmission frequencies are 63 MHz different for each aircraft

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