System Overview: Alphatron AlphaMiniCourse Gyrocompass
The Alphatron AlphaMiniCourse is a compact, cost-effective commercial marine gyrocompass manufactured under the Alphatron Marine (Japan Radio Company – JRC) brand. Engineered specifically for vessels where wheelhouse space is at a premium—such as offshore tugs, workboats, pilot vessels, fast crew suppliers, and commercial fishing vessels—the AlphaMiniCourse delivers dependable true North heading reference in a rugged, monoblock enclosure.
Combining a low-maintenance, dry gyroscopic sensor element with advanced digital microprocessor control, the AlphaMiniCourse eliminates supporting fluid handling, reduces power consumption, and provides direct NMEA 0183 ($HEHDT) and step repeater outputs for bridge equipment.
Technical Specifications: AlphaMiniCourse
| Parameter | Specification Details |
|---|---|
| System Designation | Alphatron Marine AlphaMiniCourse Master Gyrocompass |
| Sensor Technology | Hermetically sealed dry gyroscopic sensor element (maintenance-free) |
| Settling Time | Approximately 1 to 1.5 hours from cold start |
| Static Accuracy | ≤ ±0.3° secant latitude |
| Dynamic Accuracy | ≤ ±0.7° secant latitude in standard commercial sea states |
| Follow-Up Speed | Up to 50°/second tracking capability |
| Data Interfaces | 2x RS-422 NMEA 0183 ($HEHDT at 20Hz), 1x Step output (24V DC), Alarm relay contacts |
| Operating Voltage | 24 V DC (18–32 V DC); optional 115/230 V AC auto-switch adapter |
| Power Consumption | Approx. 40 W running (75 W starting) |
Core Assemblies & Field Replacement Parts
| Component | Part Number | Description & Function |
|---|---|---|
| AlphaMini Sensor Core | AMC-SEN-CORE | Hermetically sealed dry gyro sensor block (rebuilt & recertified) |
| Main Processing Board | AMC-PCB-MAIN | Microprocessor controller executing error correction and serial heading output |
| Front Panel Display PCB | AMC-PCB-DSP | Integrated digital LED heading display and operator keypad |
| Servo Follow-Up Motor | AMC-MTR-FUP | High-resolution stepper motor driving azimuth indicator ring |
| Power Supply Filter PCB | AMC-PCB-PWR | DC/DC filtering board with reverse polarity and spike protection |
| Timing Drive Belt | AMC-BELT-TIM | Precision neoprene timing belt linking servo motor to azimuth dial |
| Chassis Vibration Isolators | AMC-MNT-ISO | Set of 4 heavy-duty rubber-metal anti-vibration mounts |
Seanav Maintenance Standards for AlphaMiniCourse
Seanav Marine maintains certified technicians and replacement parts for Alphatron gyrocompass systems:
- Routine Annual Check: Inspecting internal power rails, checking servo motor backlash, and verifying digital signal amplitude.
- Azimuth Drive Belt Tuning: Inspecting belt tension, checking pulley alignment, and lubricating drive bearings.
- Digital Serial Calibration: Verifying RS-422 baud rate and sentence transmission ($HEHDT at 20 Hz) into radar and autopilot.
- Emergency Power Switchover Test: Verifying uninterrupted heading output during shipboard generator switchover.
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