Patent ID: 7605748

Claim:
A frequency converter for a filling level radar, the frequency converter comprising: a signal generator unit for generating a frequency converted electromagnetic transmit signal; a receiver circuit for receiving a receive signal for determining a filling level; a sampling mixer for retarding the receive signal; a transmit coupler; and a first amplifier for amplifying one of the frequency converted transmit signal and the receive signal; wherein the transmit coupler has an input for picking up the amplified frequency converted transmit signal from the signal generator unit, a first output for directly delivering the transmit signal to an antenna device, and for picking up the receive signal from the antenna device, and a second output for delivering the receive signal to the receiver circuit; and wherein the signal generator unit comprises a first frequency converter unit for converting the frequency of the transmit signal and the receiver circuit comprises a second frequency converter unit for converting one of the one of the receive signal and of a signal generated by a pulse generator.