Abstract: A radio transmitter, comprising: a feedback loop (314) which feedback loop comprises a variable attenuator and a signal analyser, means (300, 302, 304, 306, 308, 310, 312) for transmitting a signal on a predetermined radio channel, means (308) for changing attenuation level and for attenuating the feedback signal, means (316) for defining power levels on the radio channel and on the adjacent channels, means (312) for analysing the power levels to generate first and second results of analysis and for comparing the first and second results of analysis, means (318) for delaying a transmitted signal to derive a reference signal, means (312) for comparing the feedback signal and the reference signal to generate an error vector and means (320) for generating a test alarm.

Abstract: A radio transmitter, comprising: a feedback loop (314) which feedback loop comprises a variable attenuator and a signal analyser, means (300, 302, 304, 306, 308, 310, 312) for transmitting a signal on a predetermined radio channel, means (308) for changing attenuation level and for attenuating the feedback signal, means (316) for defining power levels on the radio channel and on the adjacent channels, means (312) for analysing the power levels to generate first and second results of analysis and for comparing the first and second results of analysis, means (318) for delaying a transmitted signal to derive a reference signal, means (312) for comparing the feedback signal and the reference signal to generate an error vector and means (320) for generating a test alarm.

Abstract: The invention relates to a method and an arrangement implementing the method for gain control. In the method, a signal is modulated and the modulated signal is amplified with a power amplifier (312) to an output (313). A modulated signal of a given timeslot is applied to a control unit (323) before the power amplifier (312). Said amplified modulated signal is applied from the output (313) to the control unit (323). The signals are compared in the control unit, in which a control signals is also generated based on the comparison. The gain is controlled based on the control signal in a following at least one timeslot. The gain may also be controlled between timeslots, based on the control signal.