Technical Specification

General:

• Product Type: Automatic Antenna Tuning Unit (ATU) / Antenna Coupler
• Compatibility: Designed for use with Samyung MF/HF Transceivers (e.g., SRG-150DN, SRG-250DN, SRG-1150DN, SRG-1250DN, SRG-3150DN, SRG-3250DN series).
• Function: Automatic impedance matching between MF/HF transceiver and antenna to achieve optimal SWR.
• Control: Remotely controlled and powered by the connected Samyung MF/HF transceiver.

Electrical:

• Frequency Range: 1.6 MHz to 27.5 MHz (covering all marine MF/HF bands).
• Input Impedance: 50 Ohms (from the transceiver).
• Output Impedance: Tuned to match the specific characteristics of the marine whip antenna.
• Power Handling Capacity (PEP):
  • Typically 150W PEP (for models paired with 150W transceivers like SRG-1150DN).
  • May also support up to 250W PEP (for models paired with 250W transceivers like SRG-1250DN).
• Power Supply: 24 VDC (sourced directly from the MF/HF transceiver or a dedicated power supply unit).
• Current Consumption: Relatively low, primarily when tuning (specific value not commonly published for ATUs, but generally under 1A).
• Tuning Time: Typically very fast, often within 1 to 15 seconds, depending on the frequency band change and initial mismatch.

Physical & Environmental:

• Mounting Location: Designed for outdoor installation, typically near the base of the whip antenna to minimize coaxial cable loss between the tuner and antenna.
• Dimensions: (Approximate, as exact dimensions can vary slightly between revisions and specific models)
  • Length: ~380-450 mm
  • Width: ~238-327 mm
  • Depth: ~285-380 mm
  • Note: Some sources indicate dimensions around 300(W) x 255(H) x 125(D) mm, or 450x380x285mm, so it’s important to verify with an exact datasheet if precise measurements are critical.
• Weight: Approximately 5 kg (or similar, depending on internal components).
• Construction: Robust, marine-grade, weatherproof aluminum or durable plastic enclosure.
• Ingress Protection (IP) Rating: Likely IP66 or IP67, indicating high resistance to dust and powerful jets of water/temporary immersion, suitable for exposed marine environments.
• Operating Temperature: -15°C to +55°C (standard for marine electronics).
• Storage Temperature: -25°C to +70°C (standard for marine electronics).
• Vibration: Compliant with IEC 60945 (marine navigational equipment – general requirements).
• Grounding: Requires proper grounding to the vessel’s hull for optimal performance and safety.

Features:

• Automatic Tuning: Utilizes internal relays and matching components to automatically achieve a low SWR.
• Overload Protection: Designed to protect itself and the connected transceiver from high SWR conditions.
• Self-Test Function: May include self-diagnostic capabilities.

Compliance:

• Often complies with ITU, IMO, and GMDSS (Global Maritime Distress and Safety System) requirements when part of a compliant MF/HF system.
• IEC 60945 (General requirements for marine navigational equipment).