A printed circuit board defines a first outer surface and a second outer surface that is opposite the first outer surface. The method includes using a false key to encode plural subsets representing receivers in the system. As a result, a magnetic coating material suitable for a low-noise high-density coating-type magnetic recording medium is obtained. The frequency correction message contain offset information which is used by the mobile communication device to determine its offset from a nominal frequency. A controller controls flow into and from the refrigerant reservoir through selective opening and closing of control valve in line and control valve in line.