• Acoustic Modem and Transducer - Data from the BPR transmits at 600-2400 baud utilizing a Benthos
acoustic modem with a mid frequency directional transducer. This transducer has a 60-degree conical
beam which allows for focused transmission of data between the BPR and the receiving surface buoy.
Modem transmits digital data via the Minimum Frequency Shift Keying (MFSK) modulated sound
signals with options for redundancy and convolutional coding. If initial data is incorrect or incomplete,
then two additional transmissions are attempted for a maximum of three attempts. Quantity – 1