The Scandinavian Micro Systems SR01-02Mk1 Heading Repeater is an earlier generation of the popular marine navigation instrument designed to display a ship’s heading and Rate of Turn (ROT). While it shares the core functionality with its newer counterparts (Mk2 and Mk3), it represents the initial version of this specific model series.
Technical Specification
General:
- Model: SR01-02Mk1 Heading Repeater
- Manufacturer: Scandinavian Micro Systems AS
Display:
- Heading Display: Digital LED display (super-bright, readable from a distance).
- Heading Resolution: 0.1 degrees.
- Rate of Turn (ROT) Display:
- Analog Turning Indicator™ (ATI): Ring of LEDs indicating turning direction and proportional rate. (Early versions of this patented feature).
- Numeric ROT Display: Typically 2-digit LED display for Rate of Turn in degrees per minute (max 99 deg/min, flashing above this). Resolution likely 1 degree per minute.
Input Data:
- Primary Protocol: NMEA 0183 (common sentences like $HEHDT for heading).
- Interface: Likely RS-422 (standard for NMEA 0183 in marine applications).
- Baud Rate: Auto-sensing, but likely supporting common rates like 4800 and 9600 bps.
- Data Source: Receives heading data from various compass types (gyrocompass, magnetic compass, satellite compass – though dedicated source identification LEDs like in Mk3 may not be present).
Power Supply:
- Voltage: 24V DC (typical range would be 18-32V DC).
- Current Consumption: Relatively low, likely similar to later models (e.g., around 0.3A at max brilliance).
Environmental:
- Operating Temperature: Standard marine electronics range (e.g., -15°C to +55°C, possibly -25°C to +55°C).
- IP Rating: Designed for marine environment, likely a good IP rating (e.g., IP54 or higher, though Mk3 is IPx6). Suitable for bridge console or internal mounting.
- Compass Safe Distance: Should be specified to prevent magnetic interference.
Physical:
- Dimensions: Likely very similar, if not identical, to the 192 mm (width) x 96 mm (height) x 40 mm (depth) of the later models, as this is a standard panel cutout size.
- Mounting: Direct Panel Mount or Cradle Mount.
Key Differences/Limitations Compared to Mk2/Mk3 (implied):
- Fewer Proprietary Protocol Support: Primarily focused on NMEA 0183.
- No Dedicated Heading Source LEDs: Mk1 typically wouldn’t have separate LEDs for GYR, MAG, SAT.
- Simpler Alarm System: While alarms for data errors would be present, the historical alarm buffer (for 16 events) might be a later enhancement.
- Potentially Lower IP Rating: The IPx6 rating might have been introduced or improved in later revisions.
There are no reviews yet.