The present document specifies technical characteristics and methods of measurements for equipment employing UWB devices for vehicle access systems, which use pulse based, packet oriented UWB signals for data transfer and/or distance bounding and/or localization purpose. EXAMPLE: Radio equipment employing UWB technology for vehicle access systems is equipment intended to be utilized for vehicle access, vehicle immobilization and extended vehicle access control functionalities (like closing windows or remotely starting the car). Following types of equipment are covered by the present document: 1) Equipment Type 1: Vehicle transceivers, which meet the conditions below: a) Vehicle transceivers communicate on a "trigger-before-transmit" basis with: i) vehicle ID devices (equipment type 2); and/or ii) other vehicle transceivers (equipment type 1); and/or iii) other UWB devices (e.g. smartphones). b) Vehicle transceivers are installed in the vehicle. c) Vehicle transceivers are capable of operating in the permitted frequency range as specified in Table 1 with either an integral antenna or a Radio Frequency (RF) output connection and dedicated antenna. 2) Equipment type 2: Vehicle ID devices (e.g. key fobs), which meet the conditions below: a) Vehicle ID devices are handheld devices. b) Vehicle ID devices communicate with vehicle transceivers (equipment type 1). c) Vehicle ID devices are paired with one specific vehicle and are an accessory to this vehicle. d) Vehicle ID devices are capable of operating in the permitted frequency range as specified in Table 1 using an integral antenna.