RHOTHETA Elektronik
RT-300
Dual-Band Direction Finder System
The RT-300 is an all-purpose direction finder system that is designed for operation on two different frequency bands depending on the application. The RT-300 sets new benchmarks in terms of precision and reception sensitivity. Special algorithms permit fast, stable display of information.
| Method of bearing: | Doppler principle (3 kHz rotational frequency, right/left rotation) |
|---|---|
| Bearing accuracy1 | Better than ±5° RMS |
| Displayed resolution: | Digital display: 1°, LED circle: 10°, 0.5° at serial NMEA output |
| Bearing reference: | Relative to antenna orientation, magnetic or true north2 |
| Internal resolution: | 0.5° |
| Sensitivity for system accuracy of 5°: | RF voltage at receiver input (50 Ω): ≤ 50 nV (VHF + UHF) Electrical field (radiated sensitivity): 121.500 MHz: ≤ 0.5 μV/m 156.800 MHz: ≤ 1.5 μV/m |
| Frequency stability: | ±2.0 ppm (Δf/f = ±2 x 10-6) (at temperatures from -30 °C to +80 °C) |
| Receiving bands: | 2 |
| Receiving frequencies: (or see identification plate for special customer-specific options) |
RT-300-VS VHF air band: 118.800 to 121.500 to 124.000 MHz VHF marine band: 156.000 to 156.800 to 162.025 MHz (marine, channels 1 – 88) RT-300-VU VHF air band: 118.800 to 121.500 to 124.000 MHz UHF air band: 241.000 to 243.000 to 245.000 MHz |
| Frequency steps: | 25 kHz |
| Bearable modulation: | A3E, F3E, A3X (PLB 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: | ≤ 100 ms (with sufficient reception field strength) |
| User interface: | LC graphic display 98 x 32 pixels backlight 13 illuminated keys 36 LED circle for bearing display Freely adjustable dimming of LCD brightness, LCD backlight, key illumination and LED circle illumination |
| Supply voltage: | 12 V to 28 V DC |
| Power consumption: | Supply voltage 12 V Standby 350 mA (4.2 W) Av. without ext. speaker 400 mA (4.8 W) Av. with ext. speaker 600 mA (7.2 W) Max. without ext. speaker 450 mA (5.4 W) Max. with ext. speaker 800 mA (9.6 W) Supply voltage 28 V Standby 250 mA (7.0 W) Av. without ext. speaker 300 mA (8.4 W) Av. with ext. speaker 400 mA (11.2 W) Max. without ext. speaker 350 mA (9.8 W) Max. with ext. speaker 600 mA (16.8 W) |
| Audio out: | Max. 1.5 W at 4 Ω (Upp,max = 10 V) |
| Interface: | RS-232, NMEA (RS-422 with galvanic isolation of input), RS-485, relay contact (switching on if alarm is detected), input for self-bearing suppression |
| Weight: | Display Control Unit (DCU): approx. 700 g Antenna Unit (AU): approx. 1400 g |
| Operating temperature: | -20 °C to +60 °C |
| Storage temperature: | -50 °C to +70 °C |
| Ingress protection: | IP 67 (The use of the mast sealing kit is recommended to protect the antenna connector against moisture.) |
RT-300
Accessories
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-300
References
RT-300
