The SPECTRONICS Model DD-1C Digital Frequency Display is designed to operate in conjunction with the Collins KWM2/2A transceivers and 75S series receivers. The DD-1C provides a six digit display of both transmitted and receive frequency in the "transceive" mode (receive frequency only with 11S-LINE" operating in splitfrequency mode). The displayed frequency is indicated in MHz, kHz, and hundreds of Hz, providing rapid interpretation by the operator. The display is updated approximately 17 times per second, thus permitting an instantaneous readout while tuning across the band.