| 摘要 |
PURPOSE:To vary the length of a print pattern and to tune an adjusting circuit by providing a grating-shaped adjustment part to part of a reactance element printed on a base board and cutting part of this reactance grating. CONSTITUTION:The 1st adjusting circuit 20a is constituted by connecting a capacitor 21 and the variable reactance element 23 formed on the base board by a print pattern in series. Grating-shaped patterns A-D are provided to part of this print pattern and those grating-shaped pattern are cut to vary the pattern length. The 2nd adjusting circuit 20b is constituted by connecting a capacitor 22 and a reactance element 24 formed by a print pattern in series with each other. Therefore, the circuits are packaged symmetrically. When an adjustment for balancing the outputs 5 and 6 of a rat racing circuit 3 is made, the grating-shaped adjustment parts A-D of said variable reactance 23 are cut properly in order from A to vary the pattern length, namely, to vary the value of the variable reactance 23, thus tuning the circuit. |
