The present document specifies technical characteristics and methods of measurements for monostatic X-band radar sensors intended for the surveillance of airspace traffic with the following characteristics: - Operating in the frequency range 8 500 MHz to 10 000 MHz utilizing modulated pulses. - The transceiver-antenna connection is using a hollow metallic rectangular waveguide. - The antenna is rotating, waveguide-based and passive. - At the transceiver output an RF-circulator is used.