RHOTHETA Elektronik
RT-202 Crewfinder
MOB Direction Finder System
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. 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 in each environmental condition.
| Method of bearing: | Doppler principle (3 kHz frequency of rotation) |
|---|---|
| Bearing accuracy1 | ±5° |
| Internal resolution: | 1° |
| Sensitivity: | < 2 μV/m |
| Reception frequencies: | 121.500 MHz + 121.650 MHz (customer-specific frequencies available on request) |
| Bearable modulation: | A3E, F3E, A3X (distress modulation), bearing largely independent of modulation |
| Polarization: | Vertical |
| Polarization error: | ≤ 5° at 60° field vector rotation |
| Garbling cone: | Approx. 30° to the vertical |
| Response time3 | ≤ 50 ms (with sufficient reception field strength) |
| Operating voltage: | 12 V to 28 V DC |
| Power consumption: | Max. 350 mA (without external speaker) |
| Monitoring: | With built-in miniature speaker, modulation: A3E |
| Serial RS-232 (V24): | 1200 baud, parity = odd, 7 data bits, 1 stop bit |
| Audio out: | For external loudspeaker (on GND) approx. 5 Vpp on 8 Ω, output power approx. 0.5 W |
| Alarm out: | Open collector output to GND with reception signal/alarm: Uout < 1.0 V DC (Imax approx. 100 mA) |
| Operating temperature: | -20 °C to +60 °C |
| Weight: | Display Control Unit (DCU): approx. 600 g Antenna Unit (AU): approx. 1400 g |
| Dimensions: | DCU: length x width x height 120 mm x 100 mm x 55 mm AU: diameter x height 260 mm x 600 mm |
| Ingress protection: | IP 67 (The use of the mast sealing kit is recommended to protect the antenna connector against moisture.) |
| Lateral thrust due to wind: | Approx. 14 N at 150 km/h wind speed Approx. 20 N at 180 km/h wind speed |
RT-202 Crewfinder
Accessories
Aluminium DCU
The RT-202 DCU is optionally avaliable in a Aluminium version. The interchangeable mounting brackets allow the recessed mounting in a front panel or a control station.
AU Simulator
The AU Simulator is a compact and easy-to-use test device for RT-202 and RT-300 DCUs. The AU Simulator is powered by the DF-Unit's DCU and provides assistance for a fast troubleshooting process onboard.
DC/DC Converter
The DC/DC converter prevents damage to the direction finding system due to compensation current which flows across the System Ground to minus voltage supply e.g. generated when starting the engines. Mandatory for vessles with metal hull.
RT-202 Crewfinder
References
RT-202 Crewfinder
