Rhotheta MT-500-M Direction Finder

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Rhotheta MT-500-M Direction Finder

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Rhotheta MT-500-M Direction Finder

The RT-500-M is a multi-band direction finder system that operates on all frequency bands used for rescue missions.

This direction finder automatically monitors the emergency frequencies 121.500 MHz, 243.000 MHz and 406.028 MHz (Cospas-Sarsat) as well as channel 16 of the marine band. The bright TFT display permits a clear overview of all direction finder information and operating parameters.

The convenient menu structure makes it possible to adapt the RT-500-M direction finder system to the needs of the user. Various interfaces (LAN, NMEA RS-422, RS-232) facilitate integration of the direction finder system in legacy or planned system environments.


The RT-500-M direction finder system fully meets the steadily increasing needs of civilian and military search-and-rescue organizations.

Emergency beacons that operate on the 406.028 MHz Cospas-Sarsat frequency can be reliably identified and localized.

Like all Rhotheta direction finder systems, the RT-500-M features complete MOB functionality to ensure the safety of SAR crew members. That makes the RT-500-M direction finder system a complete solution for professional SAR organizations.

Although the RT-500-M was optimized for use in high sea states, this direction finder system is also suitable for stationary VTS applications.

Special Features

  • Universal multi-band direction finder: VHF aviation and marine band, UHF aviation band, Cospas-Sarsat frequency
  • Automatic monitoring of emergency frequencies during work on other frequency bands
  • High reception sensitivity to permit detection of extremely weak or distant signals
  • High direction finder accuracy, precise and stable display
    LAN, NMEA, RS-422 and RS-232 interfaces for system integration and remote control
  • Optimized for use at sea: robust construction, waterproof (IP67) display/control unit and antenna
  • Compact broadband antenna system (Patent DE 4421759 C1)
  • Brigth graphic TFT color display
  • Remote control unit for exterior control platform with full control and display functionality
  • Complete illumination with automatic dimming