Undersea Systems, Geophysical Equipment, Survey Sonar and ROV

Acoustic Modems

ATM-885

Depth	2000 m (6,560 ft)
Size	14 cm (5.5 in) diameter x 85 cm (33.5 in) length.
Weight	11 kg (24 lbs) dry, 5 kg (11 lbs) wet
Power	378 W•Hr internal batteries (can also be powered by external source)
Frequencies	Low frequency (LF) 9-14 kHz, Mid frequency (MF) 16-21 kHz
Transducer	Omni directional (180° beam), Directional (60° beam)
Connection	MBH-9-MP connector on unit, 9 pin RS-232 cable included

Part Number	Description
013308........................	ATM-885 LF Omni
013446........................	ATM-885 MF Omni
Call for availability.....	ATM-885 LF Directional
013688........................	ATM-885 MF Directional

General Specifications

Baud Rate	140-15,360 bps
Bit Error Rate	Better than 10-7 with high SNR
Data Storage	704 Kbyte Data logger standard
Processing	Data redundancy, 1/2 rate convolutional coding mulitpath guard period selection MFSK and PSK modulation schemes
Distances/Range	2-6 km common, greater distances possible, 20+ km available using repeater functionality

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