The 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

Technical Data

Dimensions (WxHxD)

85mm x 115mm x 35mm



Temperatur range

-20°C bis +60°C

Ingress protection

IP 65


< 0.2µV at antenna input

Receiving frequencies

121.500 MHz (channel 1 / distress frequency)
121.650 MHz (channel 2 / taining frequency)

Audio exit

max. 8 Vpp (speaker > 8 Ohm)

Relay contact

I switch = 0.5 A (max.); Pswitch = 10W (max.) ohm resistive load

Current consumption

Standby = 80 mA
max. 400 mA (alarm + external speaker)

Operating voltage

12V to 24V DC (± 20%)

Antenna connector

BNC (female) impedance: 50 Ω