Manufacturer: Kongsberg

The medium frequency transponders, the SPT 31x and MPT 31x series are the subsea and seabed elements of the Kongsberg Maritime underwater positioning and navigation systems. The transponder models have 56 channels for use with the HiPAP / HPR systems. Common for all the models are that they, on interrogation, replies with a single- or a multi-pulse response. This reply contains different information to the HiPAP / HPR system, depending on the present system application.

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