A pulsed radar level gauge used for determining a process variable of a content in a tank, wherein the process variable is the level of an interface between two or more materials (3,4) in the tank or the level of a surface of the content in the tank, comprising: a transmitter for generating and transmitting a signal in the form of a pulse train, means for guiding said pulse train into the tank, and allowing it to propagate towards the content in the tank, means for receiving pulses reflected in said tank, and to form an analogue tank signal based on these reflections, said tank signal comprising at least one peak indicating a surface echo, wherein said means for forming said analogue tank signal comprises a sample-and-hold circuit adapted to receive said reflected pulses and for generating said analogue tank signal or wherein said means for forming said analogue tank signal comprises a mixer for mixing said reflected pulses with a modulated pulse train, and an analogue to digital (A/D) converter for sampling and digitizing said tank signal and forming a digital time domain reflectometry signal to be provided to processing circuitry, which processing circuitry is arranged to determine said process variable based on said digital TDR signal, characterized in that the pulsed radar level gauge further comprises means configured to adjust an amplitude of said analogue tank signal to match the dynamic range of said A/D-converter, by varying the output power of said transmitter during the transmission of said pulse train, based on the received analogue tank signal, so that an amplitude of pulses in said received analogue tank signal is below an upper limit of an input range of said sample-and-hold circuit or mixer. a transmitter for generating and transmitting a signal in the form of a pulse train, means for guiding said pulse train into the tank, and allowing it to propagate towards the content in the tank, means for receiving pulses reflected in said tank, and to form an analogue tank signal based on these reflections, said tank signal comprising at least one peak indicating a surface echo, wherein said means for forming said analogue tank signal comprises a sample-and-hold circuit adapted to receive said reflected pulses and for generating said analogue tank signal or wherein said means for forming said analogue tank signal comprises a mixer for mixing said reflected pulses with a modulated pulse train, and an analogue to digital (A/D) converter for sampling and digitizing said tank signal and forming a digital time domain reflectometry signal to be provided to processing circuitry, which processing circuitry is arranged to determine said process variable based on said digital TDR signal, characterized in that the pulsed radar level gauge further comprises means configured to adjust an amplitude of said analogue tank signal to match the dynamic range of said A/D-converter, by varying the output power of said transmitter during the transmission of said pulse train, based on the received analogue tank signal, so that an amplitude of pulses in said received analogue tank signal is below an upper limit of an input range of said sample-and-hold circuit or mixer.