Abstract: The disclosure relates to a circuit arrangement for transmitting uplink and downlink signals between at least one terminal device and at least one antenna, wherein the circuit arrangement comprises a signal coupler for providing a decoupled uplink or downlink signal, a device for providing a reference signal of adjustable frequency, a mixer for mixing the decoupled signal and the reference signal and a filter device for low-pass or bandpass filtering of the mixed signal, wherein the circuit arrangement comprises an evaluation device for evaluating the filtered signal, wherein, depending on the adjusted frequency of the reference signal and on at least one signal property of the filtered signal, a frequency band or channel in which the transmitted signal is being transmitted can be identified, and also to a method for identifying a frequency band or channel.

Abstract: An antenna unit is configured to transmit and/or receive signals and is connected to transmitting/receiving unit via a signal cable. A control device is configured to adjust signal strength by modifying gain of the control device. A calibration signal is provided by the transmitting/receiving unit and the signal strength of the calibration signal is used to adjust the gain of the control device.

Abstract: A circuit arrangement capable of adjusting signal parameters of a plurality of signals that is transmitted between one or more terminals and one or more antennas is provided. The circuit arrangement is configured to separate a common signal path for the plurality of signals into a plurality of individual signal paths, wherein two or more signal paths of the plurality of signal paths are configured to carry different single signals. A signal adjusting section is configured to independently adjusting one or more signal parameters for two or more single signals.