Transceiver unit for a first and second transmitting/receiving frequency

This application claims priority to International Application No. PCT/DE00/00351 which was published in the German language on Feb. 4, 2000. The invention relates to a transceiver unit for operation at a first and second transmitting/receiving frequency. In particular, a transceiver unit for operation in different systems of mobile telecommunication, having exactly one power output stage for the first and second transmitting frequency, one receiving section having a first and a second input for the first and second receiving frequency, respectively, a transmitting/receiving antenna and a switchable filter element for optionally connecting the power output stage or, respectively, the first or second input of the receiving section to the transmitting/receiving antenna.