What actually happens in the ADF receiver when the BFO position is selected?
Domanda 20, Radio Navigation - ATPL - Airline Transport Pilot license
| 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 |
| The BFO circuit imposes a tone onto the carrier wave to make the NDB's ident audible |
