Communication device i.e. radiolocation device, for geolocation of e.g. train, has power supply conversion circuit and controllable switch s controlled for selecting voltage at power supply of radio communication antenna

摘要

The device has a power supply conversion circuit (21) converting power supply for a radiofrequency communication antenna (11), which comprises a power supply generating circuit (1) for generating power supply at a certain voltage. Another power supply generating circuit (3) generates power supply at another voltage different from the former voltage, where the circuit (3) is a direct voltage reducing circuit connected to an output of the circuit (1). A controllable switch (5) is controlled for selecting the former voltage or the latter voltage at a power supply cable (25) of the antenna.