1-4 CHAPTER 1 Overview
Series 3900 Sonar System Operations and Maintenance Manual 11214510, Rev. 02
1.3.2 Subsurface Equipment
The subsurface equipment comprises the towfish, as shown in Figure 1-2, and a
tow cable.
Towfish. The Towfish consists of a negatively buoyant tow body containing
port and starboard sonar transducers, processing and control electronics for
sonar operation, a downlink demultiplexer for control signals, and an uplink
multiplexer for sonar and auxiliary sensor data.
Tow Cable. The tow cable is a complete assembly consisting of a coaxial tow
cable with a copper conductor, an electro-mechanical termination on the
towfish end, and an electrical underwater connector. The tow cable is available
in a lightweight polyurethane jacketed Kevlar reinforced design. The
lightweight design is used for operations with cable lengths of 300 meters and
under.
Figure 1-2: Towfish
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