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“768无线地震遥测设备”是为在电信传输地震台网的网点间不易架设明线,或线路容量不足的场合使用而专门设计的,当然,也可用于受大地震破坏的现场.该设备是由一对超短波发射机与接收机构成,采用二次调频.它既可直接与单分向短周期地震计连接传输0.5HZ—25HZ 的地震模拟信号,也可直接与专门设计的多路数字前兆遥测设备配合使用传输0.2HZ—20HZ 的 CHDB_4码(相容高密度二进制码).因而可用来传输地电、地磁、地应力、地倾斜等多种地球物理量.该仪器自1977年7月起先后在北京、上海、天津台网进行了实地传输试验,其后又在昆明地震台网使用了一年多.结果表明,该仪器轻便、灵活、稳定、可靠,有较强的抗干扰性.当天线架设高度足够时,最远传输距离可达115公里.
The “768 Wireless Earthquake Telemetry Equipment” is specially designed for applications where there is no easy way to set clear lines or insufficient line capacity between the networks of telecommunication transmission seismographs, and of course, it can also be used on sites damaged by a major earthquake. A pair of ultrashort wave transmitters and receivers form the second frequency modulation.It can be directly connected with the single-point short-period seismometer seismic analog signal transmission 0.5HZ-25HZ, but also directly with the specially designed multi-digital precursor precursor telemetry The device can be used to transmit 0.2HZ-20HZ CHDB_4 code (compatible with high-density binary code), which can be used to transmit various geophysical quantities such as geoelectric force, geomagnetism, ground stress and ground tilt etc. The instrument has been used since July 1977 Beijing, Shanghai and Tianjin have conducted on-the-spot transmission tests, and then used more than a year in Kunming Seismological Network.The results show that the instrument is lightweight, flexible, stable, reliable and strong anti-interference.When the antenna Erection height enough, the farthest transmission distance up to 115 km.