CST50-D is a UHF transmitter module for desktop and 19-inch rack use, operating 400–550 MHz with 16 pre-set channels within a 7 MHz switching window. It provides up to 300 mW RF output, FM modulation with selectable deviation, and a transformer-balanced, floating XLR audio input. Frequencies are PC-reprogrammable via UPK32 or the optional MTB50 master board configuration; dimensions are 120 × 43 × 160 mm and weight about 650 g. Power input is 10.5–16 VDC.