Other underwater Signaling and Receiving Devices

AN/SSQ-36B BT

Prior to deployment of any detection sonobuoys, it is advisable to have a vertical temperature profile of the ocean. The AN/SSQ-36B Bathythermal (BT) buoy provides a low-cost method to obtain vertical temperature profiles of water column. This approach provides near synoptic area surveys while eliminating costly vessel time. The BT is widely used for airborne Anti-Submarine Warfare (ASW) applications to evaluate local effects of seawater temperature on sonar propagation and acoustic range prediction. This sonobuoy has an operating life of approximately 12 minutes at which the temperature probe is at a depth of 800 meters (2625 ft). The sensors are calibrated for an accuracy of ± 1 degree F at a descent rate of 5 feet per second. VHF transmissions from this sonobuoy are processed to read temperature versus descent in real time. It can be air launched or over-the-side launched, is 'A' size (can be 'G' size), and is 99 channel selectable. The transmitter output is ¼ Watt.
 Download AN/SSQ-36B BT Data Sheet

MK-84 MOD 1 SUS

The Signal Underwater Sound (SUS) device is used primarily for one-way acoustic communication with submarines. The device can be set to generate one of five distinct, coded sequences. Four of these sequences consist of a continuous tone that alternates in frequency in accordance with the timing sequence defined in the Code Table (see specifications). The fifth sequence is a continuous tone at a single frequency. Third harmonics of the fundamental frequencies are also generated at levels slightly less than those of the fundamentals. A five-position switch on the side of the unit accomplishes settings. The MK-84 is designed to provide a source level of 160 dB per micro-Pascal within two (2) seconds of water entry and throughout its one-minute life.
 Download MK-84 MOD 1 SUS Data Sheet

AN/SSQ-125

The AN/SSQ-125 Coherent Source is a NATO, A-size sonobuoy manufactured by SonobuoyTech Systems for use as a source in a multi-static field. The AN/SSQ-125 is capable of generating a variety of waveforms upon command and is designed to work with the AN/SSQ-53F, AN/SSQ-77C and AN/SSQ-101 (ADAR) sonobuoys.
 Download Low Frequency Coherent Source Data Sheet