Edgetech 2000-TVD, User Hardware Manual

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1-4 1.0: OVERVIEW
2000-TVD COMBINED SONAR 0017424_REV_B
The towfish is available with a choice of 100/400 kHz or 300/600 kHz dual and simultaneous FM chirp
operating frequencies for the side scan sonar. The sonar electronics are contained inside a single
electronics bottle which includes a double O-ring sealed end cap on each end. The aft end cap contains
bulkhead connectors for connecting the transducers, the hydrophone arrays and optional equipment. The
towfish interfaces with the 2000 Topside computer over an Ethernet connection using digital subscriber
line (ADSL) modems in both the towfish and the processor.
The 2000-TVD towfish sub-bottom sonar operates over a frequency range of 0.5–12 kHz, has a 300-meter
depth rating and is designed primarily for coastal applications requiring greater bottom penetration. It is
hydro-dynamically stabilized and includes the sub-bottom transducer and four sub bottom hydrophone
arrays mounted under an acoustic baffle. This assembly, along with the connecting cable harnesses, is
contained inside a two-piece fiberglass shell which bolts together and includes tail fins and carrying
handles.
CAUTION! The carrying handles on the 2000-TVD towfish should not be
used for overhead lifting.
The port and starboard side scan transducers are mounted to the lower half of the shell. A teardrop cover
encloses the top of the sub bottom transducer and its transformer, and a hinged tow bridle provides the
mechanical connection for the tow cable. The electronics bottle is mounted to the upper half of the shell
aft of the teardrop cover.
A labeled image of the 2000-TVD towfish is shown in F
IGURE
1-2 .