| 摘要 |
PROBLEM TO BE SOLVED: To provide a communication unit which can predict whether the intensity of an electric field rises or falls by detecting the intensity of the electric field of radio communication and calculating the differential value of the intensity of the electric field, based on the obtained intensity of the electric field. SOLUTION: An electric field intensity detection means detecting the intensity of the electric field of radio communication and a calculation means for calculating the differential value of the intensity of the electric field based on the intensity of the electric field, which is obtained by the electric field intensity detection means are provided. At transmitting while an operator walks, differential data of the intensity of the electric field is monitored. Thus, warning sound can be emitted by a receiver and a buzzer and a message can be displayed on a display device if there is a possibility that a trouble might occur in transmission/reception. In the communication unit, an electric field intensity detection part 238 detects the intensity of the electric field in a radio wave received from the output signal of an RF processing part 236 and sends the value to a CPU 239. The CPU 239 selects a base station, whose intensity of the radio wave is the largest and which is most satisfactory from a plurality of base stations. |
