A dampening system for a miniature high-speed turbojet engine provides single or multiple resilient mountings for forward and aft bearings which mount a rotor shaft. The anode is formed from a plurality of separate components, which allows the properties of each component to be more readily controlled during manufacturing. A processing facility with the control center is configured for receiving the RF power signal from the device and calculating from the RF power signal and the data base items the field strength received at said predetermined point from the antenna.