| 摘要 |
<p>PURPOSE:To facilitate the detection of vibration in a hot-line state in coupling abnormal vibrations through a signal transmission line by being equipped with an abnormal vibration detection section having an acceleration sensor, a timer and a radio transmitter to an aerial cable and by providing a radio receiving section near the aerial cable separating from the above abnormal vibration detection section. CONSTITUTION:When an aerial cable 1 vibrates abnormally, an abnormal vibration detection section vibrates, too. If the direction and degree of vibration exceeds the set limits of sensitivity, a contact switching signal will be obtained. With the above contact switching signal a timer is operated and a radio signal is outputted. The radio signal is received by a radio receiving section 3 and transmitted to a tuner and a filter circuit. The frequency is synchronized and intensified. The radio signal is converted into a discriminative transmission signal by the transmission signal matched with a circuit modulator to overlap a signal transmission route 4. On the other, in a monitoring section 5 the transmission signal is separated to specify the aerial cable causing abnormal vibration and to discriminate the vibrating condition.</p> |
