When you open that mic, the most important thing to do is what seems like the easiest one: MEAN IT.
But this is actually very difficult to do without some training. If you sound even the slightest bit insincere, or like you’re just serving up information with no real emotional investment in it… well, that’s why everyone’s impression of an air talent is that kind of pukey, surface-level-but-no-deeper “announcer guy” (or vapid nitwit).
ESPECIALLY if you’ve been blessed with an exceptional voice, remember that Emotions top “a great voice” every time.
If you sound like you actually MEAN what you’re saying, your listener will feel it. If you don’t, in baseball terminology you “just fouled one off your own foot.”
A lack of credibility is never anyone’s first choice.