This structure operated in what is referred to as the "S-band." This high-frequency component was primarily used to deliver video or long-distance voice signals between the lunar surface and the Earth.
This component was primarily used to deliver voice communications between the lunar surface and the orbiting command pilot. However, in the event that the hi-gain system failed, the low-gain system also could be used as a backup for Earth communications.
The LCRU managed dual-frequency duplex communications between the rover, the command module and the Houston communications center. In effect the LCRU was the communications central processor for all signals from the rover and its constituent systems.