The S4 Rescue is a 9GHz X-band Radar transceiver and has been designed for assisting air/sea ship or survival craft rescue operations in accordance with IMO, GMDSS requirements. When a radar signal is received from a ship or aircraft, the S4 Rescue automatically transmits a response signal, which clearly identifies the survival craft on the radar screen by means of a stream of 12 in-line dots. Once activated the S4 will remain in standby mode for over 96 hours. The S4 Rescue has been designed for reliable operation in the toughest of marine environments, in accordance with IMO GMDSS requirements.

Features:

• Receiver Response:  9.2 - 9.5 GHz, sensitivity better than - 50dBm 
• Transmitter Response:  12 forward and return sweeps through the range 9.2 - 9.5GHz. Nominal sweep times 7.5us forward and 0.4us return. Minimum recovery time following excitation, less than 10us. Response reply receiver signal less than 0.5 us.
• Radiated Power (EPIRB):  Not less than 400mW (+26dBm)
• Duration of Operation:  96 hours in standby condition followed by a minimum 8 hours of transmission while being continuously interrogated with a pulse repetition frequency of 1 kHz. 
• Temperature Range:  -4°F to + 131°F operational
• Range: -22°F to + 149°F storage 
• Antenna Characteristics:  Vertical beamwidth at least +/- 12.5 degree relative to the horizontal plane of the radar transponder to +/- 2dB. Azimuthal beamwidth omnidirectional to +/- 2dB. 
• Effective Antenna Height:  3’3" or greater. 
• Weight:  33.25 oz without Bracket
• Dimensions:  11.8" long x 2.44" diameter