The CTL-22D is a Digital Display Communication Control that provides tuning for units with either 8.33 KHz or 25 KHz spacing. The CTL-22/22A Controls have a four and one half digit display and the CTL-22D display has five and a half digits. The CTL-22D control offers a strap-selectable option for providing COMM tuning in 8.33-kHz increments from 118.000 to136.992 MHz. The CTL-22D is used for controlling the Proline II communication transceivers such as VHF21A, VHF21B, VHF22A and VHF22B. The CTL-22D provides nonvolatile storage of preset frequencies besides the active and preselect frequencies that are displayed.

The CTL-22D can be used as a  direct replacement for the CTL-22C.The CTL-22D is available with a black or gray bezel,variations of ON/OFF selection and volume control. The CTL-22D has the ability to have both 28V and 5V lighting.