The repeater is a Hanwell radio telemetry transmitter, designed for use with the Radiolog environmental monitoring system. The units are in IP65- rated cases, suitable for use in tough environments and are powered by an external 12 DC supply. The repeater is used for transparently forwarding radio data between Hanwell’s range of radio sensors and receivers. Applications for the repeater include extending transmitter range, frequency shifting, reception/transmission to and from shielded areas and repeaters with internal receivers and external transmitters can be used to make jumps between buildings.