Sonardyne's existing Wideband Sub-Mini transponder (WSM) is typically interrogated by a responder trigger sent down the ROVs' umbilical or a narrow band tone signal. In some situations, reverberation or multi-path of the tone interrogation can cause interference problems. The new WMT is Sonardyne's first mini-sized transponder. It is slightly larger than the WSM and provides full two-way Wideband interrogation and reply which completely mitigates interference from and to other users. For use on ROVs, the WMT includes responder trigger, an integrated rechargeable Li-Ion battery pack that is charged from the ROV's power supply and full RS232 communications enabling channel set up, power and gain etc. to be changed from the surface. The WMT is available in three depth versions: 3,000 m, 5,000 m and 7,000 m. The 5,000 m and 7,000 m versions have a higher acoustic output power level for improved long range operation. An On/Off switch (3,000 m only) helps to ensure the battery pack is not discharged when not in use. If an umbilical trigger is not available, then the full Wideband transponder mode provides excellent USBL performance in a small, lightweight package. Remote omni or directional transducers are available for both the WMT and existing WSM range. These make installation on a ROV easier as the remote transducer can be installed where there is good line-of-sight and is easily replaced if damaged. The main body of the transponder can then be installed within the ROV frame where it is well protected from damage.
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