Scan Repeater SR03-01Mk2 Universal Drive Unit | NMEA
Scandinavian Micro Systems
Refurbished
Manufacturer: Scandinavian Micro Systems
Product Family: Scan Repeater
Model: SR03-01Mk2
Product Type: Universal NMEA to STEP & SYNCHRO Converter / Drive Unit
Marine Application: Gyrocompass heading conversion and distribution to legacy shipboard repeaters and navigation equipment
The equipment shown in the supplied photograph matches the Scan Repeater SR03-01Mk2 Universal NMEA to STEP & SYNCHRO Converter & Drive Unit. It is designed to bridge modern digital heading sources with marine equipment requiring traditional step or synchro heading signals.
This type of converter is especially valuable during gyrocompass upgrades, because it can allow existing bridge repeaters and other compatible legacy equipment to remain operational instead of requiring the entire heading-distribution network to be replaced.
Modern gyrocompasses and satellite compasses commonly distribute heading through digital serial data, while many older shipboard systems were designed for electrical STEP or SYNCHRO heading signals.
The Scan Repeater Universal Drive Unit solves this compatibility problem.
The SR03-01Mk2 receives digital heading information and converts it into electrical output formats suitable for traditional heading repeaters and compatible navigation equipment. Available documentation describes it specifically as a “Universal NMEA to STEP & SYNCHRO Converter & Drive Unit.”
A gyro repeater displays the heading generated by a vessel's master gyrocompass at another location on the ship.
The difficulty arises when a new heading source provides NMEA digital data, but the vessel's existing repeater network expects an older electrical signal.
The SR03-01Mk2 acts as an interface:
Gyro / Heading Sensor → NMEA Data → SR03-01Mk2 Converter → STEP or SYNCHRO Output → Existing Repeaters
This makes the unit useful for retrofit and modernization projects.
For example, a vessel may replace an obsolete mechanical gyrocompass with a modern gyro or satellite compass. Instead of replacing every compatible heading repeater, the converter can translate the new heading signal into the format required by the existing repeater network.
The SR03-01Mk2 is designed around flexible marine heading conversion and distribution.
Important functions include:
The unit is therefore more than a simple serial converter. It functions as a signal converter and repeater drive interface.
The internal processor interprets incoming NMEA heading information and calculates the corresponding electrical output required by the selected STEP or SYNCHRO configuration.
The front-panel display allows engineers to check operating information and configuration parameters locally.
This is particularly useful during installation and troubleshooting because heading input and configuration can be checked directly at the converter.
The front controls provide menu navigation and parameter configuration.
Correct configuration is critical because gyro repeater systems can use different signal types, voltages and ratios.
The digital input receives heading information from the vessel's heading source.
Depending on the installation, this source may be a:
The STEP interface recreates the incremental heading signal required by compatible older repeaters.
The SYNCHRO interface provides the electrical heading representation required by compatible synchro equipment.
The unit provides monitoring functionality so abnormal heading input or converter conditions can be identified rather than silently supplying unreliable information.
A common retrofit installation may look like:
Modern Gyrocompass / Satellite Compass
↓
NMEA 0183 Heading Data
↓
Scan Repeater SR03-01Mk2
↓
STEP / SYNCHRO Heading
↓
Existing Bridge & Wing Repeaters
This can significantly simplify a navigation-equipment modernization.
Older synchro installations can involve significant electrical voltages. Technical references for gyro synchro interfaces warn that potentially hazardous voltages can exist on gyrocompass output lines, so installation and measurement should only be performed by qualified personnel.
The Scan Repeater Universal Drive Unit is particularly useful aboard commercial vessels with a mixture of modern and legacy navigation equipment.
Typical applications include:
It can help preserve serviceable legacy repeaters while upgrading the primary heading source.
If the converter powers normally but does not receive heading information, check:
Heading source → NMEA output → communication wiring → polarity → input terminals → configuration.
Confirm that the master gyro or heading sensor is actually transmitting the required data.
If valid NMEA heading is visible at the converter but the connected repeater remains stationary, the problem is likely downstream.
Check:
Output configuration → STEP/SYNCHRO selection → output wiring → drive voltage → repeater wiring → repeater mechanism.
Do not assume that the converter PCB has failed before checking the repeater network.
Incorrect terminal wiring or output configuration can result in reversed movement.
On synchro systems, incorrect phase connections can produce incorrect direction or angular displacement. Similar gyro-interface documentation shows that interchange of synchro leads changes heading behavior.
The wiring diagram for the exact configuration should therefore be followed.
If the master heading is correct but the repeater has a constant offset, check:
A constant offset is different from a continuously increasing error and should be diagnosed accordingly.
Possible causes include loose terminals, unstable NMEA communication, poor shielding, damaged cabling or power-supply problems.
Marine vibration makes terminal inspection particularly important on older installations.
If heading outputs work but the local display or keypad behaves incorrectly, investigate the display assembly and its internal connections separately from the main drive circuitry.
Too many repeaters or a fault in the repeater circuit can overload the drive output.
Disconnecting branches systematically can help identify a defective repeater or cable, but work on powered STEP/SYNCHRO circuits should follow proper electrical safety procedures.
Periodically inspect the unit for dust, moisture, corrosion, loose terminals and overheating.
Check all NMEA, STEP and SYNCHRO wiring during scheduled bridge-navigation maintenance.
Compare repeater heading against the vessel's master heading reference.
Inspect cable shields and grounding arrangements after any bridge equipment modification.
When replacing a gyrocompass, record the old repeater signal configuration before disconnecting the original equipment. This makes configuration of the replacement converter considerably easier.
Do not change STEP/SYNCHRO parameters experimentally on an operational vessel without documenting the existing configuration.
Many vessels still contain reliable analogue or electromechanical heading repeaters even after the original gyrocompass has become obsolete.
Replacing every repeater, cable and associated interface can make a gyro retrofit unnecessarily expensive.
A universal converter such as the Scan Repeater SR03-01Mk2 provides a practical bridge between generations of equipment:
New digital heading source + existing legacy repeater infrastructure.
This is particularly valuable on older merchant vessels where maintaining compatibility and minimizing installation downtime are important.
It is a Universal NMEA to STEP & SYNCHRO Converter & Drive Unit designed for marine heading systems.
Its primary purpose is to convert digital NMEA heading information into traditional STEP or SYNCHRO signals that compatible legacy marine equipment can use.
Yes. Retrofit projects are one of the most useful applications for this type of equipment, provided the existing repeater requirements match the converter's supported configuration.
That is a primary application of the unit. Exact compatibility must still be confirmed from the repeater's signal type, voltage, ratio and wiring.
A gyro repeater remotely displays heading information generated by the vessel's master gyrocompass.
Yes. The SR03-01Mk2 documentation identifies the equipment as an NMEA-to-STEP and SYNCHRO converter/drive unit.
Yes. STEP conversion is another principal function.
Confirm the complete model number, input format, required STEP/SYNCHRO output, supply voltage and existing repeater specifications. Photos of the original unit's nameplate and terminal connections are also valuable.
The Scan Repeater SR03-01Mk2 Universal Drive Unit by Scandinavian Micro Systems is a marine heading-signal converter designed to receive NMEA heading data and generate STEP and SYNCHRO outputs for compatible legacy gyro repeaters and navigation equipment. It is particularly useful for gyrocompass and satellite-compass retrofit projects where existing bridge and wing repeaters need to remain in service.
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