1-6
Figure 1-2: Tiger and Mother Boards inside 3200-XS Topside Processor
1.3.2 SB-424, SB-216S, and SB-512i Tow Vehicles
The SB-424, SB-216S, and SB-512i Tow Vehicles are each designed to operate over a specific frequency
range, and as lower operating frequencies generally require longer hydrophone arrays and larger
transducers, the vehicles differ primarily in size and weight.
The SB-424 Tow Vehicle, which is the smallest of the three, operates over a frequency range of 4–24 kHz,
followed by the SB-216S at 2–16 kHz, and then the SB-512i at 0.500–12 kHz. All three tow vehicles are
shown in F
IGURE 1-3.
Each is hydrodynamically stable, with the transducers and hydrophone arrays mounted under an acoustic
baffle to reject downward traveling multiple echoes. These components, along with "spider" cable
harnesses and a preamplifier, are enclosed in a two-piece fiberglass shell that is fitted with stabilizing fins
and lead ballast.
A hinged U-framed tow bridle is used for towing, and the tow point location can be adjusted to
accommodate different towing speeds and depths. The tow vehicles are each shipped in a wooden crate.
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