Radio frequency transiver - a device for transmitting and receiving a radio signal. This is a transmitter-receiver that provides a bi-directional radio interface between devices. In modern devices, radio frequency transceivers are used to transmit data in wireless networks, for example, ZigBee and to measure the distance between tags and anchors in RTLS . An example of such a device is an anchor , which includes two radio frequency transceivers: one for measuring distances using CSS technology (ISO 24730-5), the second for working as part of a wireless network (ZigBee)