| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a signal level display unit capable of displaying a level of a received signal of an antenna at an installation location of the antenna. <P>SOLUTION: A BPF 10 extracts only signals with a reception band of the antenna 2 from the received signal received from the antenna 2, an amplifier 11 amplifies the received signal subjected to band limit by the BPF 10, and a gain adjustment unit 12 adjusts the level of the amplified received signal. A detection circuit 13 detects an output from the gain adjustment unit 12, comparison circuits 14a to 14e compare the detection signals with reference voltages respectively, and display units 15a to 15e are lighted in response to comparison outputs. Thus, the level of the received signal received by the antenna 2 can be displayed depending on the lighting state of the display units 15a to 15e. <P>COPYRIGHT: (C)2007,JPO&INPIT |
