Direction Finders
Locator Beacons
Emergency Receivers
CrewFinder MOB Direction Finder System


Mobile Land

Like the RT-100 emergency receiver, the RT-202 CrewFinder MOB direction finder system monitors the international emergency frequency 121.500 MHz and triggers an alarm in the event a distress signal is received. At the same time, the direction of the transmitter is determined and indicated by a LED ring.

All of our SAR products feature a selective squelch function that only triggers an alarm if a distress signal is actually identified. This eliminates false alarms due to radio frequency interference or other radio signals. When the selective squelch function is deactivated, any radio signal can be received regardless of its modulation.

The RT-202 also features a second operating frequency (121.650 MHz) for training and testing purposes.

In the event of a man overboard situation, the individual in distress can be found quickly and easily. No matter how adverse the visibility and weather conditions (darkness, fog, precipitation, waves…), the CrewFinder never loses “sight” of the person in the water.


The RT-202 direction finder system is a compact, robust SAR instrument intended for localization of crew members in the water or assistance of crew of neighboring vessels.

For mobile rescue missions at sea or on land:

With its compact antenna, this SAR direction finder is also suitable for installation on board of smaller vessels and rescue craft as well as for rescue missions on land.

Special Features

  • Simple intuitive operation
  • Extremely high reception sensitivity to permit detection of extremely weak or distant signals
  • Special processing algorithm for signal stable localization
  • Selective squelch to avoid false alarms
  • Waterproof (IP67) and robust
  • Extremely compact design
  • Portable model also available
  • RS-232 interface for remote control capability


Method of bearing Doppler-principle (3 kHz frequency of rotation)
Bearing accuracy ±5°
Internal resolution
Sensitivity < 2 µV/m;
< 150 nV at receiver input
Receiving frequencies 121.500 MHz + 121.650 MHz (custom frequencies on request)
Bearable kinds of modulation A3E, F3E, A2X (ELT-modulation), bearing largely independent of modulation
Polarisation vertical
Polarisation error ≤ 5° at 60° field vector rotation
Garbling cone approx. 30° to the vertical
Time of response ** ≤ 50 ms (with sufficient receiving field strength)
ELT-Identification specification Downward audio sweep,
frequency range = [300Hz ... 1600Hz],
repetition rate = [250ms ... 500ms], f/100ms = [-140Hz
Operating voltage 11V.. 28V DC
Current consumption max. 350 mA (without external speaker)
Monitoring with inbuilt miniature speaker; modulation: A3E
Seriel RS232 (V24) 1200 Baud; parity = odd; 7 data bit, 1 stop bit
Audio exit for external speaker (on GND) app. 5 Vpp on 8 Ohm,
output power app. 0.5 Watt
Alarm exit Open collector output to GND with receiving signal / alarm:
Uout < 1 V DC (Imax: ca. 100mA)
Temperature range -20°C ... +60°C
Weight Display Control Unit: app. 600 g
Antenna: app. 1400 g
Dimensions Display: ( length x width x height ): 120 mm x 100 mm x 55 mm
Antenna: ( Diameter x height ): 260 mm x 600 mm
Protective systems Display Control Unit: IP 67 Antenna: IP 67 ***
Later due trust wind app. 14 N at 150 km/h wind speed
app. 20 N at 180 km/h wind speed



Rt_202_antenna Rt_202_antenna_closeup