The KCU-951 Control Unit provides 99 programmable channels plus 280,000 possible frequencies from 2.0 to 2.9999 MHz (at 100 Hz increments) but can be configured to operate in modes that reduce the upper frequency limit. Any channel can be preset to operate as semi-duplex, simplex, or receive only. The KCU-951 Control Unit uses non-volatile electrically erasable PROMs (EEPROMs) to store frequency, emission mode and channel data, even when the system is turned off. KCU-951 uses electronic gas discharge readouts to display frequency, channel and mode of operation. Frequency and mode selections are entered by the user and displayed via the KCU-951 display. KCU-951 control display units always express frequencies in terms of kHz.

The KCU-951 Control Unit is a component of the KHF-950 HF/SSB CommunicationSystem. All necessary controls for operation of the KHF-950 HF/SSB system, including programming of the 99 preset channels, are on the KCU-951 Control Unit. The KCU-951 Control Unit is mounted on Dzus rails. A microprocessor in the KAC-952 Power/Amplifier Coupler controls the antenna coupler and exchanges information with the KCU-951 Control Unit. In receive mode, the signal from the antenna passes through the antenna coupler, but bypasses the amplifier section.