The broadcasted ones are usually simulcasted globally across several frequencies. Different frequencies work better/worse at different times of day… but when it’s global, you could be in any time of day.
Other calls are just at one frequency. And I think if an aircraft is responding, it’s just on one frequency (dunno how they choose).
The broadcasted ones are usually simulcasted globally across several frequencies. Different frequencies work better/worse at different times of day… but when it’s global, you could be in any time of day.
Other calls are just at one frequency. And I think if an aircraft is responding, it’s just on one frequency (dunno how they choose).