VERY BASIC --- Radio For backup

[Syphon]

i neeed help

so far i've got :
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1) a trigger with radio Alpha - -> [ap] exec "help.sqs" <- in activation field
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2) a unit named base
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3) a unit named aP
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4) a help.sqs file containing.>

aP sidechat "ALPHA TO BASE. We are under Heavy Fire. WE NEED BACKUP";
base sidechat "BASE TO ALPHA. Co-ordinates locked. We are on our way.";

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so far that works -
how would i put a delay between the 2 sidechat's so they dont go off right after each other?
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and how would i make a script that sends a UH60 to the aP after they have radioed?
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[Syphon]

ahhh i figured out the delay
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~3
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^ that delays for a little while

[Randy]

i think you dont need a script for this one  
Just use waypoints with  a hold & Call action ...

[kris]

Im using this in my very 1st mission, works great, is there anyway i can "stick" this to a waypoint so calling for backup wont be available until a spesific waypoint is reached?