| 摘要 |
PURPOSE:To display the range of possible operation, by providing the sub-transceiver having similar directivity with the transceiver respectively, in the case of use of transceivers having directivity. CONSTITUTION:The transmitter 3 and the receiver 1 have the directivities W3, W1 respectively. The transmitter 3 and the receiver 1 respectively provide the subtransmitter 2 and subreceiver 4 and they have similar directivities W2 and W4. Accordingly, if the transmitter 3 is located within the control range, it can receive the signal of the subtransmitter 2 always transmittig and can display the possibility of operation on the display section, then the range of possible operation can easily be confirmed. |
