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  2. Outline of Radio Administration
  3. Outline of Radio Monitoring
  4. Maintenance of Radio Monitoring Facilities
  5. Types of Radio Monitoring Systems
  6. DEURAS Receiver (DEURAS-R)

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Construction of a nationwide radio monitoring network

A sensor station installed atop a steel tower or building is connected to a center station installed in each Regional Bureau of Telecommunications via an ISDN line. The purpose of the structure is to maintain radio monitoring facilities nationwide. Each time an unlicensed radio wave or jamming is reported, the center station sends control information, such as necessary frequency measurements, to the sensor station and displays the direction of the unlicensed radio wave source and also monitors voice. DEURAS-R measures frequencies between 25 MHz and 2 or 3 GHz, and also performs auto-supervisory operations.

Photo: DEURAS Receiver(DEURAS-R)    Figure: DEURAS Receiver(DEURAS-R)
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Copyright(C)Telecommunications Bureau of the Ministry of Internal Affairs and Communications All Rights Reserved.
Copyright(C)Telecommunications Bureau of the Ministry of Internal Affairs and Communications All Rights Reserved.