| 摘要 |
PURPOSE:To attain three ways of operations of changeover of a preamplifier and a booster and through-operation by means of only an existing feeder for the preamplifier and the booster installed near the antenna by giving a DC voltage used in common for a power supply voltage and a changeover control signal to a feeder wire tying a transceiver main body and the antenna. CONSTITUTION:The antenna 1 is connected to the transceiver main body by using a high frequency coaxial cable from a receptacle plug J2 through a path comprising brake contact of relay RL1a-direct circuit 11-brake contact of relay RL1b through a receptacle plug J1. Then, in applying a DC voltage of an intermediate value from the main body to a center conductor of the coaxial cable, the voltage is applied to a circuit 12 through a high frequency choke RFC from the J2, a transistor (TR) Q1 is turned on, and a current flows to a relay coil RL1c, then the RL1a and RL1b are switched into make contact and the device 10 acts like a preamplifier 2 of the receiver. In applying a high DC voltage to the center conductor of feeder at the main body side, a TRQ2 is also turned on and a current flows also to a relay coil RL2c, then a relay RL2 is operated, and a booster 3 is operated, and the device 10 acts like the booster of the transmitter. |
