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Friday, November 20, 2009

A Real Stumper

Sirens, chain saws, personal alarms, shouts and spraying water are among the background noises that first responders often encounter. Understandably, such ambient noise interferes with the ability to hear and understand what people are saying on a radio. The problem has come to the forefront in recent months as firefighters in particular have reported interference problems with their digital radios when using them in the presence of loud background noise. Last summer, the National Telecommunications and Information Administration tested three different communications systems used in public safety digital radios — 25-kHz analog, Project 25 full-rate improved multi-band excitation ...

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