LOCKED FREQUENCY MODIFICATION OF A MARK 6(b) SOURCE.
COLUMBIA UNIV DOBBS FERRY N Y HUDSON LABS
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The modifications to the A Mark 6b acoustic transducer enables 1 fixed frequency operation by means of an electronic phase lock control system, and 2 towing at depths to 350 ft by means of a self-regulating air balancing system and cable protecting towing chains and fairings. Author
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