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The McMurdo S4 Rescue is a compact 9 GHz X-band Search and Rescue Radar Transponder (SART) designed to help locate survivors in lifeboats and liferafts. When interrogated by a 9 GHz marine radar, the S4 Rescue automatically transmits a response that appears on the searching vessel’s radar as a distinctive series of 12 dots, allowing rescuers to identify the survival craft.
The unit is buoyant, waterproof, lightweight and equipped with an audio/visual indication of operation. It has a replaceable battery with a 5-year replacement interval and provides more than 96 hours in standby, followed by at least 8 hours of transmission when continuously interrogated.
| Parameter | Specification |
|---|---|
| Manufacturer | McMurdo |
| Model | S4 Rescue |
| Equipment Type | Radar SART |
| Application | GMDSS Search & Rescue |
| Operating Frequency | 9.2–9.5 GHz |
| Radar Band | X-band / 3 cm |
| Polarization | Horizontal |
| Receiver Sensitivity | Better than −50 dBm |
| Transmitter Response | 12 forward and return frequency sweeps |
| Forward Sweep Time | 7.5 µs ± 1 µs |
| Reverse Sweep Time | 0.4 µs ± 0.1 µs |
| Pulse Emission | 100 µs nominal |
| Radiated Power (EIRP) | >400 mW (+26 dBm) |
| Antenna | Omnidirectional in azimuth |
| Effective Antenna Height | ≥1 m |
| Response Delay | ≤0.5 µs |
| Operating Temperature | −20°C to +55°C |
| Storage Temperature | −30°C to +65°C |
| Operating Duration | 96 h standby + minimum 8 h transmission |
| Battery Replacement Interval | 5 years |
| Weight – SART Only | Approx. 360 g |
| Weight – With Pole | Approx. 510 g |
| Weight – Complete | Approx. 530 g |
| Dimensions | Approx. 283 × 101 × 90 mm |
| Buoyancy | Buoyant |
| Indication | LED + audible buzzer |
| Mounting | Pole / bulkhead mounting |
| Standard | IMO Resolution A.802(19) |
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