| 摘要 |
PURPOSE:To receive economically and surely a data signal by comparing receiving levels of plural antennas in receiving an antenna control word included in at least one frame so as to select an antenna obtaining the maximum receiving level. CONSTITUTION:The antenna control word ANTC is provided in at least one frame in 1 cycle. In receiving, an ANTC detecting circuit 32 detects the control word ANTC, a switch circuit 41 of the control section 4 is turned off, an AGC circuit 22 is separated from a level detecting circuit 21, and the detecting circuit 21 outputs a signal at the level of reception. In this case, the receiving level by an antenna 51 is stored by a level storage circuit 42 and the antenna number ''51'' is stored in an antenna number storage circuit 44. Then, the antenna is changed over from 51 to 52 by a control circuit 45, the receiving level and the reception of the antenna 51 of the storage circuit 42 are compared by a comparator circuit 43 and the control circuit 45 brings the content of the storage circuit 42 to the higher receiving level. Similarly, the antenna of the maximum level is connected to the receiving section 2. |
