A mixer apparatus, such as an integrated circuit mixer is provided for improving the physical layout of devices containing mixers. Aspects of the system may comprise a PA gain modulator that enables modification of an amplitude of a digital baseband signal. A modified operating mode employs at least one other measured value of the sensor for checking the value documents than is determined in the operating mode provided for checking the value documents. Each scope support assembly clamps to the base in a way that prevents movement thereof in a two-dimensional plan perpendicular to the weapons sighting direction. The data communications system in accordance with the invention can be put to use for both communication and navigation by end device users. The temperature sensitive element is arranged on a metal tip of the conductance probe so as to move axially when wiping the same.