The Dallas Police Department transitioned last year to Project 25, a new radio system that helped Larsen speedily identify which officer made the abnormal noise and track down his location.

KVP was Dallas’ ”police and fire radio signal system.” It featured a desk sergeant broadcasting for his squad, sending police to investigate a murder, hijacking, burglary or some other crime.

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Dallas 9-1-1 Dispatcher Owen Larsen knew immediately that something wasn't right when he heard a gurgle over the radio. DALLAS — Owen Larsen specializes in sounds.

He was traveling in a Homeland Security vehicle that couldn't communicate with Dallas police or EMS, so his car had to pull up to a Dallas police car so the officer could hand him a police radio ...