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----- HISTORICAL RECORD -----

HS/70

Country of Origin: France

description

The HS/70 is a helicopter dipping sonar that, with slight modifications, can be installed in small surface ships. The HS/70 has three basic methods of operation: active detection, passive monitoring and submarine communications. Passive monitoring uses only the receiving equipment to detect signals within a pre-determined frequency mode. Only the azimuth of a perceived threat may be targeted in this mode. In the third mode, reduced-power sound waves are transmitted and coded for...

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