A radio frequency power amplifier protection system for a radio. The system includes a drive shaft having a rotary valve mounted thereon. The mold caps and leadframe are sawed to singulate packages therefrom. In a mode of the invention, a cylindrical concave reflector 2 whose section taken vertical to a linear light source 1 is a part of an ellipse 2e having a first focus F1 at the linear light source 1 and a second focus F2 at an irradiation plane 3. In one embodiment, a logic circuit may detect the predetermined pattern of data and may cause the value of the write pointer to be captured.