CDMA (Code Division Multiple Access) is a mobile digital radio technology used in mobile telephone networks. Unlike GPS, no rooftop antenna is needed with CDMA. The signals broadcast from the CDMA mobile telephone system can easily be received from inside a building by the integrated antenna of the EndRun Pręcis II CDMA receiver.
The CDMA base stations have GPS receivers, so the base station acts as a GPS repeater, which ensures a reliable timing reference. However, compared to GPS time synchronization, CDMA will have a small offset from UTC (Universal Time, Coordinated) due to the distance between the CDMA receiver and the base station.