A digital broadcast receiver and a method of controlling data for an emergency alert system in a digital broadcast receiver are provided. The blade is spring-loaded and is pressed against the perforated disc with a preset force, so that wear can remain constant throughout the service life of the blade, and the service life of the blade can be enhanced. If a number of pending instructions within an instruction buffer is greater than a particular threshold value, a normal mode of operation is initiated. Incorporating the sorbent into the substrate reduces sorbent migration thereby improving performance and life expectancy of the heat exchanger. An actuating system is used to rotate the axle back and forth causing the paddle to sweep back and forth within the trough.