| 摘要 |
PURPOSE:To enable to adjust the reception condition at each district to the utmost, by inserting one pin plug for short circuit to the one pin socket fitted exposingly to the tuner frame and attenuating VHF signal. CONSTITUTION:The one pin socket 9 exposed with closingly fitted is placed to the tuner frame 1 having the VHF tuner 2 and the UHF tuner 3 and branch circuit 4. Further, the inductance coil L9 forming LPF6' through VHF is connected to the end of a pair of resistors R1, R2 located in the frame 1 and connected to the center pin 9b of the socket 9 so that the attenuation of VHF signal can be selected by shortening the resistors R1 and R2 with the shortening one pin plug 10 removable from the external of the socket 9 or connecting them to ground. Further, at the output side, IF blocking HPF7 is inserted, the reception condition at each district can be adjusted with the socket 9 and the plug 10 in optimum state. |
