From the online command reference:
index setRadioMsg text
Operand types:
index: Number
text: String
Type of returned value:
Nothing
Description:
Set radio message (0, 0, map radio) to given text. Use "NULL" to disable radio slot.
Example:
0 setRadioMsg "Alpha Radio"
LCD November 11, 2002, 04:22
There is no 0 channel in the radio so making
0 setRadioMsg "Alpha Radio"
will not work.
available channels are from
1-8 in OFP:CWC
and added
9 and 10 in OFP:R
____
So:
0 Setradiomsg "null"
in your init.sqs to hide the radio.
Once the trigger is actived:
0 setradiomsg "your text here".