Transmit power of public safety digital radio
A base station is a fixed installation which is directly connected to a switching device via radio relay or a transmission network.
Transmit power of base stations
Every base station consists of an antenna system and a technical container (radio equipment). The transmit power of the base stations of the public safety digital radio network are selected in such a way that the transmission between the base station and the terminal device (down-link) is just as effective as the one between the terminal device and the base station (up-link).
The transmit power of public safety digital radio base stations can reach up to 46.5 dBM (decibel referenced to 1 mW; this equals 45 W). For most antenna configurations within the public safety digital radio network, the transmit power of the base station amounts to 42 dBm (approx. 16 W).
Transmit power of mobile terminal equipment
Mobile public safety terminal equipment in public safety digital radio includes in particular hand-carried transceivers or radio sets installed in vehicles. Due to the network-relevant power requirements of the public safety digital radio network, the transmit power of public safety terminal equipment is limited to 1 W for ordinary operation; this is known as Trunked Mode Operation. Only in Direct Mode Operation, i.e. direct voice communication from one terminal device to another without using the public safety digital radio network, can the transmit power of TETRA terminal equipment amount to approximately 1.8 W or, in case of radio sets for vehicles, to about 3 W. Trunked Mode Operation with a transmit power of 1 W is typical.