An experimental 5-kc echo-ranging equipment has been developed. The system has a searchlight transducer with an active face of 15 square feet, and is capable of radiating 20 kw of acoustic power. The system uses a towed body as the transducer housing; the towing and electronics systems vehicle is an LSM. In addition to a conventional electronic driver the system employs a specially developed 5-kc rotary machinery driver. The system is equipped with basic receivers and displays. Space is provided for evaluating experimental receivers and displays. A monitor and 7-channel tape recorder are included as a part of the installation. (Author).


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