| 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 |
MENU
EN 
IT
ES
DE
FR
PL
CZ
RS
Exam Questions
Training Quiz
Exam simulation
PDF Exam
Contact Us
Prices
Are you a school?
App Mobile