| 摘要 |
PURPOSE:To eliminate the trouble of antenna operation by giving the mechanical or electric detection to the reception frequency band for the wireless mike and thus securing an automatic and simple switching from the outdoor antenna to the indoor antenna. CONSTITUTION:Pointer 9 of dial 8 shows the position to receive the FM broadcast. In case the user wants to use the wireless make, pointer 9 is moved within the reception band of marker 10 with turning of the tuning knob in order to obtain the synchronization between the oscillation frequency and the same frequency of the 76-78M Hz band. At the same time, tuning cord hooking drum 2 and cam wheel which are turned by cords 11 and 11' have a turn in a body. Then pointer 9 moves to the band of under 78M Hz. Immediately before this, cam 3' of wheel 3 presses projection 5 of microswitch 4, and at the same time slices 6 and 6' move to secure the antenna circuit switching from outdoor antenna 7 to indoor antenna 7'. |
