The present systems and methods extend the frequency range of a clock signal generated with a phase-locked loop. The system includes an antenna arrangement which supplies the reception signal to a radio receiver. In addition, the IDADs do not have to be designed to observe the specific memory protocol. Fastening bolts temporarily fasten the top cover and the base cover in a manner that allows sliding adjustment of a securing position of each ignition coil, which is loosely received in a corresponding one of the base cover through holes, in an imaginary plane that is perpendicular to an axis of each ignition coil.