| 摘要 |
PROBLEM TO BE SOLVED: To provide an antenna gain adjustment method for a transmission circuit, that can optimize the antenna gain in a short adjustment time so as to adjust the transmission circuit to have the maximum electric field strength. SOLUTION: A motor driver 3a turns a turnable operation section Ca at a prescribed pitch angle by one turn or more, the electric field strength measured by every pitch angle increase is sequentially recorded with a turning operation angle at that time during the turning operation, the maximum electric field strength is extracted from the electric field strength sequentially stored, the motor driver 3a is driven up to the turning operation angle corresponding to a pitch angle sufficiently smaller than the turning operation angle corresponding to the maximum value, while the motor driver 3a is turned at an adjustment pitch angle with higher accuracy than the pitch angle started from the turning operation angle, the electric field strength measured at that time is compared the electric field strength at the preceding adjustment pitch angle every increase in one adjustment pitch angle, when the electric field strength measured at that time is increased, the turning operation angle of the motor driver 3a is increased further by one adjustment pitch angle, when the electric field strength measured at that time is decreased, the turning operation angle is restored to the preceding adjustment pitch angle and the electric field strength is fixed to the value.
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