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You should always have a nice strong whistle. You will see some officials use a double or tripple tweet for their travel calls. I find myself doing this, but it is just out of habit at this point. I've also had an evaluator from the Patriot/Ivy League write a negative comment because of the double tweet. If you are begining, just blow one whistle.
In a call where you are trying to sell it, I think a whistle that last a little longer than your normal whistle will help. But blowing it five or six short tweets, I think just makes you look like an idiot!
Just make sure your whistle can be heard by all.
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