| 摘要 |
PROBLEM TO BE SOLVED: To always execute transmission/reception with a highly stable frequency against a use environment change through the use of the inexpensive oscillation circuit of a small volume by reading correction quantity on a condition value from a table when a reference radio wave cannot be received and controlling an oscillation frequency based on correction quantity. SOLUTION: A radio wave RF from a base station 50 is received by a mobile station transmissions/reception device and a base wave recognition part 12 recognizes the received frequency error of a self-device with respect to the frequency of the base station 50. The oscillation frequency of VCXO 16 of the self-device is controlled so that the error becomes zero. CPU 23 stores an AFC signal level in the combination of respective fluctuation cause parameters in a storage part 24 as a table. When a radio wave RF from the base station 50 is not received, CPU 23 reads an AFC value against the parameter of a temperature at that time from the table of the storage part 24 and controls the oscillation frequency of VCXO 16. |
