A pulsed radar level gauge for determining the filling level of a product contained in a tank, comprising: a frequency generator for generating a Tx frequency signal and a Rx frequency signal, wherein the Tx frequency is at least 10000 times greater than a difference frequency defined as a difference between the Tx and Rx frequencies; a transceiver for providing a transmit signal in the form of a pulse train having a pulse repetition frequency equal to the Tx frequency, and receiving a reflected signal resulting from a reflection of the transmit signal at a surface of the product; a propagating device connected to the transceiver for propagating said transmit signal towards the surface, and to return the reflected signal to the transceiver; sampling circuitry connected to the transceiver and to the frequency generator, and configured to sample the reflected signal with a sampling frequency equal to the Rx frequency in order to provide a time expanded tank signal; and processing circuitry for determining said distance based on the time expanded tank signal; wherein the frequency generator includes: one single oscillating crystal for providing an oscillator frequency f osc and frequency modifying circuitry for generating said Tx frequency and said Rx frequency from the oscillator frequency, said frequency modifying circuitry comprising a first path configured to receive said oscillator frequency and deliver said Tx frequency, and a second path configured to receive said oscillator frequency and deliver said Rx frequency, at least one of said first and second paths including a PLL (24; 26a, 26b) configured to receive said oscillator frequency f osc as input frequency and deliver a regulated output frequency being equal to the oscillator frequency f osc multiplied by a factor M/N, where M and N are integers with M>N, characterized in that the frequency generator further includes a frequency divider (25; 27a, 27b) connected to receive the regulated output frequency and deliver an output frequency equal to the regulated output frequency divided by an integer factor P. a frequency generator for generating a Tx frequency signal and a Rx frequency signal, wherein the Tx frequency is at least 10000 times greater than a difference frequency defined as a difference between the Tx and Rx frequencies; a transceiver for providing a transmit signal in the form of a pulse train having a pulse repetition frequency equal to the Tx frequency, and receiving a reflected signal resulting from a reflection of the transmit signal at a surface of the product; a propagating device connected to the transceiver for propagating said transmit signal towards the surface, and to return the reflected signal to the transceiver; sampling circuitry connected to the transceiver and to the frequency generator, and configured to sample the reflected signal with a sampling frequency equal to the Rx frequency in order to provide a time expanded tank signal; and processing circuitry for determining said distance based on the time expanded tank signal; wherein the frequency generator includes: one single oscillating crystal for providing an oscillator frequency f osc and frequency modifying circuitry for generating said Tx frequency and said Rx frequency from the oscillator frequency, said frequency modifying circuitry comprising a first path configured to receive said oscillator frequency and deliver said Tx frequency, and a second path configured to receive said oscillator frequency and deliver said Rx frequency, at least one of said first and second paths including a PLL (24; 26a, 26b) configured to receive said oscillator frequency f osc as input frequency and deliver a regulated output frequency being equal to the oscillator frequency f osc multiplied by a factor M/N, where M and N are integers with M>N, characterized in that the frequency generator further includes a frequency divider (25; 27a, 27b) connected to receive the regulated output frequency and deliver an output frequency equal to the regulated output frequency divided by an integer factor P. one single oscillating crystal for providing an oscillator frequency f osc and frequency modifying circuitry for generating said Tx frequency and said Rx frequency from the oscillator frequency, said frequency modifying circuitry comprising a first path configured to receive said oscillator frequency and deliver said Tx frequency, and a second path configured to receive said oscillator frequency and deliver said Rx frequency, at least one of said first and second paths including a PLL (24; 26a, 26b) configured to receive said oscillator frequency f osc as input frequency and deliver a regulated output frequency being equal to the oscillator frequency f osc multiplied by a factor M/N, where M and N are integers with M>N, characterized in that the frequency generator further includes a frequency divider (25; 27a, 27b) connected to receive the regulated output frequency and deliver an output frequency equal to the regulated output frequency divided by an integer factor P.