VEHICLE COMMUNICATION DEVICE

摘要

PROBLEM TO BE SOLVED: To provide an antenna transmission output having desired power while suppressing a cost increase and the increase of a mounting area by the provision of a power detector in a vehicle communication device in which an antenna and radio communication equipment are connected by a coaxial cable.SOLUTION: A value obtained by measuring a coupling amount between antennas 110 and 130 is stored in advance in a storage unit. A loss amount L by a coaxial cable 9 is calculated from the output power of a transmitter unit 222, the input power of a received signal input to a receiver unit 221 and a coupling amount C stored in the storage unit. Based on the loss amount L by the coaxial cable 9, an adjustment unit adjusts the transmission power Ps of a transmission wave radiated from the antenna 130 to be equivalent to reference power Pref.