Emergency Services, ID, USA

The users of the emergency services' mobile radios are spread across a large area, but required a system that gave them all access to the same radio channel. They identified that a simulcast system - that simultaneously broadcasts from many transmitters on the same frequency - would deliver what they needed.

However, simulcast systems can be expensive to buy and maintain because precise control of the transmitters is required to receive an undistorted audio signal in coverage overlap areas. Over time the transmitter frequencies drift and the audio signals that modulate the transmitters have to be corrected.

The new system delivers high audio quality to areas not previously covered. Digital signal processing-based Line Equalizer Modules that route audio to each transmitter, analyze the characteristics of the neighboring transmitter and automatically adapt their own signal to match.