A technique includes selecting one out of a plurality of frequency bands and providing a voltage controlled oscillator to generate a mixing signal for the selected frequency band. In one aspect, a method includes receiving data that specify a set of search results responsive to a search query. One of multiple surge protection circuit units is connected between the input port and an input of the splitting circuit. Said material composition comprises a matrix material for forming a basic coating matrix and at least one filler for adjusting desired coating proportions or coating characteristics. Alternatively, the controller may alert an operator that a vehicle has been uprighted in an incorrect direction.