| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To prevent the influence of an oscillation phenomenon from expanding by routing, even if relay waves are transmitted at the same frequency as a reception frequency. <P>SOLUTION: A GAP filler device comprises a station selector 18 that comprises a reception means for receiving radio waves at the UHF band, a transmission means for retransmitting at the same frequency as the received frequency, a signal attenuator 11 for controlling the output level of a reception signal, and an oscillation detection means, and allows the oscillation detection means to output an intermediate frequency signal at the HF band or VHF band that is lower than the reception frequency; a plurality of filters 17; a plurality of detectors 16 for detecting an intermediate frequency signal outputted by the filter 17 for outputting a DC voltage; a plurality of comparators 15 for determining whether the DC voltage obtained by detection is higher than a prescribed value; and a data retainer 14 for retaining the output of the comparator 15, thus preventing an oscillation phenomenon by increasing the amount of attenuation in the signal attenuator 11, when oscillation is detected, based on the output of the oscillation detection means. <P>COPYRIGHT: (C)2006,JPO&NCIPI</p> |
