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One long sharp blast.
This can be practiced by loosely holding the whistle with your lips and blow it with enough force to blow it out of your mouth...had a hearing impaired official with a weak whistle, he couldn't hear it, and this helped him a lot.
Other whistle tips:
Don't have it in your mouth when you toss the jump ball.
Find out what the local view is on whistles for bringing in subs...in my area it's a no-no.
Don't blow it on every throw-in.
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