RT-300 Specifications

Method of bearing   Doppler-principle (3 kHz rotational frequency, right / left rotation)
Bearing accuracy   better ±5°
Displayed resolution   Digital display: 1°; LED circle: 10°; 0.5° at serial NMEA output
Bearing reference   Relative to antenna orientation, magnetic or geographic north
Internal resolution   0.5°
Sensitivity for system accuracy of 5°   RF-voltage at receiver input (50 Ohms)
≤ 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 = ±2·10-6) [at temperature range -30°C…+80°C]
Receiving bands   2
Receiving frequencies:
(or see type plate for special customer options)		  

RT-300 VS
VHF air band: 118.800 ... 121.500 ... 124.000 MHz
VHF marine band: 156.000 ... 156.800 ... 162.300 MHz (maritime, channel 01 - 88)

RT-300 VU
VHF air band:118.800 ... 121.500 ... 124.000 MHz
UHF air band: 241.000 ... 243.000 ... 245.000 MHz
Frequency steps   25 kHz
Bearable kinds of modulation   A3E, F3E, A3X (ELT-modulation); bearing largely independent of modulation
Polarisation   vertical
Error of polarisation   ≤ 5° at 60° field vector rotation
Garbling cone   app. 30° to the vertical
Time of response   ≤ 100 ms (with sufficient receiving field strength)
User interface  

LC-graphic display 98x32 dots with backlight
13 buttons with legend illumination
36 LED circle for bearing display
Free adjustable dimming of LCD brightness, LCD backlight, legend illumination and LED circle illumination

Supply voltage range   12 V ... 28 V DC
Current consumption   supply voltage 12V 28V
stand by 350mA (4.2 W) 250mA (7.0 W)
typ. without ext. speaker 400mA (4.8 W) 300mA (8.4 W)
typ. with ext. speaker 600mA (7.2 W) 400mA (11.2 W)
max. without ext. speaker 450mA (5.4 W) 350mA (9.8 W)
max. with ext. speaker 800mA (9.6 W)  
External audio   max. 1.5 W at 4 Ohm (Upp-max = 10 V)
Interface   RS232; NMEA (RS422 with galvanic isolated input); RS485
Relay contact (switching on if alarm is detected)
Input for self bearing suppression
         
Mechanical data        
Weight  

Display contol unit (DCU): app. 700 g
Antenna unit (AU): app. 1400 g

Operating temperature range   - 20°C ... + 60°C
Storage temperature range   - 50°C ... + 70°C
Protective systems   Display contol unit: IP 67
Antenna unit: IP 67