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Home > Exam Questions > ATPL - Airline Transport Pilot Licence > Radio Navigation > What actually happens in the ADF receiver when the BFO position is selected?

20 - ATPL Question Bank in English - What actually happens in the ADF receiver when the BFO position is selected?

Question 20 - Radio Navigation - ATPL - Airline Transport Pilot Licence

The BFO circuit is de-activated

The BFO circuit oscillates at an increased frequency in order to allow identification of A2A NDBs

The BFO circuit is activated, and the receiver accepts only A1A modulated signals

It mixes an internal oscillator signal with the received unmodulated signal at intermediate frequency to produce an audible beat note for identification.

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