| 摘要 |
PURPOSE:To obtain a small remote transmission circuit whose transmission distance is long by connecting a high frequency tuning circuit composed of a transmission inductance and a capacitor to the collector of a transistor, connecting a switching element to an emitter and connecting a low frequency transmission circuit with a wide band width to a base. CONSTITUTION:When the constant voltage of 6V is impressed on the high frequency turning circuit and the current of 400KHz is caused to flow in the base of the transistor 1 from the low frequency transmission circuit 12, the high frequency tuning circuit 7 is originated and the transmission inductance 3 transmits radio when remote controlling IC9 turns on the switching transistor 8. The transmitted radio wave is diffused with 300MHz as a center. If a receiver can receive all diffused radio waves it can receive large power even if the peak value of transmitted radio wave is low. Thus, the transmission distance can be prolonged even if the radio wave has a low peak value. |
