Patent ID: 7363812

Claim:
A pulsed radar level gauge (RLG) used for determining a process variable of a content in a 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; an analogue to digital converter for sampling and digitizing said tank signal and forming a digital time domain reflectometry (TDR) signal; processing circuitry arranged to determine said process variable based on said TDR signal; and means for varying the output power of said transmitter during the transmission of said pulse train, in order to adjust an amplitude of said analogue tank signal to match the dynamics of said A/D-converter.