Abstract: An arrangement for controlling and adjusting the output power of radio frequency signals sent from a radio unit (100) and the input power of radio frequency signals received by the radio unit. Variations in the amplification/attenuation of transmitter-and-receiver units are simultaneously compensated for in both the transmitter part and the receiver part of the units so that the amplification will remain the same irrespective of these variations in operation. A detector signal (Udet) is compared with a reference signal (Uref) by a difference amplifier (112), which generates a difference signal (Ue). The detector signal (Udet) is measured by a power sensing means provided in the vicinity of an antenna (113), and corresponds to the power at which radio frequency signals are transmitted. The reference signal (Uref) corresponds to a desired power of transmitted radio frequency signals.