Yes, you can. Name your pilot, for example, Pascasio (original Spanish name
). No create a trigger, and put in its condition line:
Damn, I can't remember it, I haven't done anything with OFP since early December
Oh, I've found a question I answered in August. Alright, put in the trigger's condition field:
(position pascasio select 2) > x
Put the height you want intead of X.
In the On Activation field of this very trigger, put: 1 setradiomsg "WHATEVER YOU WANT TO SHOW AS MESSAGE"
Now you must create another trigger, Activated by Radio Alpha. PUt in its condition field whatever you want -you ought to have an idea of what you want-. And now, at last, create another trigger. Condition: TRUE. On Activation: 1 setradiomsg "null"
Et voilĂ ! Now at the beginning of the mission you won't see the radio but when the condition of the first trigger is met (or which is the same, when the pilot is above that height), it will activate the radio channel.
Hope this helps.