| 摘要 |
PURPOSE:To execute adjusting operation of a variable element at all times within a stable region by using a pseudo antenna resistor for a load of an output circuit to apply a preset adjustment in advance before a radio wave is emitted actually from a transmitter. CONSTITUTION:The preset adjustment is conducted in advance by using the pseudo antenna resistor for the load of the output circuit before the radio wave is emitted actually from the transmitter. In the said preset adjustment, variable elements C10, C20 are changed over the entire variable range to apply the adjustment thereby measuring the tuning value of each variable element in the assembled frequency and measuring the stable operation region of the transmitter when each variable element is changed before and after the tuning value. The variable elements are corrected again so as to be matched to the input impedance of the antenna at the operation and since the variable range of the variable elements is limited to the stable operating region set previously at the preset adjustment, the matching circuit element is protected. |
