Rhotheta RT-100 Emergency Receiver

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Rhotheta RT-100 Emergency Receiver

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Rhotheta RT-100 Emergency Receiver

The Rhotheta RT-100 Emergency Receiver (also marketed under the name “CrewGuard”) monitors the international emergency frequency 121.500 MHz. The receiver triggers an acoustic alarm whenever a signal is received on this frequency. At the same time, a relay activates external alarm devices.

In the “selective squelch” mode, an alarm is triggered only if the signal is transmitted by an emergency beacon (ELT, PLB or EPIRB ). This eliminates false alarms caused by radio frequency interference or radio traffic from aircraft that use this frequency as a calling frequency.


  • Alert of rescue personnel in the event of distress situations at sea (man overboard) or on land
  • Automatic activation of rescue or alarm systems
  • Automatic activation of MOB function of GPS receivers
  • Monitoring of international emergency frequency
  • Testing of rescue beacons (PLBs, EPIRBs, ELTs ...)
  • Recognition of inadvertently triggered ELT beacons at airports to avoid unnecessary and expensive rescue missions

Special Features

  • High reception sensitivity for greater range
  • Simple operation
  • Selective squelch to avoid false alarms
  • Potential-free relay for activation of external devices
  • Integrated speaker and audio out for external speakers
  • Robust, waterproof construction