TACAN RANGE

THe TACAN signal consists of 2700 pulse-pairs/second whose amplitude is modulated by a 15Hz signal and a 135 Hz signal
These constitute the variable part of the TACAN signal
The reference part of the TACAN signal consists of coded sets of pulses called reference groups (or bursts)
The MAIN reference group (MRG) consists of 24 pulses with alternate spacings of 12 and 18μs. This is transmitted when the antenna pattern main lobe reference point passes the North reference
The AUXILIARY reference group (ARG) consists of 12 pulses with of 30 μs spacing. This is transmitted when each of the auxiliary lobe reference points passes the North reference