| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a modem that can be used for both a BS modem and an antenna modem, and to provide an antenna control system. <P>SOLUTION: The modem comprises: an AISG connectors 4a and 4b of which respective pin terminals for inputting and outputting a control signal and a power supply signal are electrically connected with each other; a modem circuit 5 that modulates the control signal input from the AISG connector 4a to generate and output the modulation signal, or demodulates the modulation signal into the control signal to be output to the AISG connector 4b; a combining and separating circuit 6 that combines the modulation signal and the power supply signal to generate and output an AISG signal, or separates the AISG signal into the modulation signal and the power supply signal to be output to the modem circuit 5 and the AISG connector 4b; and a bias T circuit 7 that superimposes the AISG signal on a feed signal to generate a superimposed signal and output the generated signal via an RF connector 3b or separates the superimposed signal into the AISG signal and the feed signal to be output to the combining and separating circuit 6 and the RF connector 3a. <P>COPYRIGHT: (C)2013,JPO&INPIT |
