Abstract: The invention relates to a radio transceiver having a high-frequency output stage and a control circuit for controlling the transmitter power, in which the control circuit is supplied with an actual voltage in the form of a signal derived from the transmit signal. Especially in handheld radios the environment of the antenna is affected by the position of the unit, so that antenna mismatches constantly occur. This can disturb the proper operation of state-of-the-art power control circuits. To avoid such interference, the invention proposed to supply as an actual value to the control circuit a signal which is tapped prior to the signal being supplied to the high-frequency power amplifier output stage.

Abstract: A radio transceiver including a counter for outputting a DC compensation signal, an amplifier for receiving a input signal having a DC component and for receiving the DC compensation signal and forming a signal difference between the input signal and the DC compensation signal and a comparator for comparing the signal difference and a reference signal. The counter increases and decreases the DC compensation signal based on the output of the comparator such that the incrementation or decrementation of the counter is based on the DC component of the signal difference.

Abstract: A transmit/receive radio set having a transmitter output stage, a receiver input stage, and an antenna switching device for change-over between transmission and reception by a single antenna. Two impedance transformers are provided at the output of the transmitter output stage. A switching circuit effects a change-over of the output impedance of the transmitter output stage during transmission and reception by controlling the impedance of at least one of the impedance transformers.