Instrument fact sheet: Acoustic Relocation System, Model 301 and Recoverable Acoustic Transponder, Model 322

The Model 301 acoustic relocation system and model 322 recoverable acoustic transponder are designed to provide an acoustic link for marking, locating, and recovering instrument packages or other items from the sea floor. The 301 system consists of a coder and a power amplifier (both Model 200) and a receiver and a transducer (both Model 301). The basic command signal is a five- 'level' pulse train coded as follows: (1) carrier frequency, (2) modulation frequency, (3) pulse width, (4) pulse repetition frequency, and (5) time duration. These parameters are varied to produce three different codes for the inhibit, confirmation reply/enable, and release commands.