Tow Vehicle - Edgetech 4125 SIDE SCAN User Manual

The 4125-P Portable Topside Processor interfaces with the tow vehicle either over a direct 10/100BaseT
connection or, with the additional telemetry option, over a 10BaseT connection that uses very high bit
rate digital subscriber line (VDSL) modems. The topside unit also interfaces with a global positioning
system (GPS) over a USB to serial or RS-232 serial interface.
The topside processor integrates tow vehicle and DC power supplies, an ETHERNET switch, a wireless
router, and, with the additional telemetry option, an VDSL modem, all housed within a single, compact,
rugged, water-tight (when closed) Pelican Storm Case. It runs on either AC or DC power, and interfaces
with the laptop computer over a wired or wireless 10/100BaseT ETHERNET connection. The computer can
be stored inside the enclosure when not in use.
Never attempt to use the portable topside's storm case as a shipping
container. Doing so could void warranties and/or result in system
damage.
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Tow Vehicle

The 4125 Tow Vehicle is available with a choice of 400/900 kHz or 600/1600 kHz operating frequencies,
and with or without the additional telemetry option. It contains the sonar transducer arrays and the
electronics required to transmit and receive the sonar signals; to receive the downlink commands from
the topside processor; and to provide the uplink side scan data, sensor data, and status information to
the topside processor.
The electronics are contained inside a single, lightweight stainless steel, 200-meter depth-rated housing,
comprising the aft section of the tow vehicle. The forward section is flooded and includes both the port
and starboard transducer arrays. A single O-ring sealed end cap is attached to each end of the housing to
seal it, and the forward end cap contains bulkhead connectors for connecting to the transducer arrays. An
adapter cable also connects to this end cap.
The cable snakes through a hole in the transducer array section and includes an inline connector for
connecting to the tow cable. The tow vehicle interfaces with the topside processor either over a
10/100BaseT ETHERNET connection, or (with the additional telemetry option only) over a 10BaseT
connection that uses VDSL modems in both the tow vehicle and the topside processor.
The tow vehicle is also equipped with four stabilizer fins, a stainless steel nose for hydrodynamic balance,
and two convenient carrying handles. A towing arm is rigidly mounted to a tow point on the top of the
tow vehicle housing adjacent to the tow cable connector. The tow cable attaches to a shackle on the
towing arm.
Additional mounting holes are provided on the tow point should it be necessary to reposition the towing
arm forward or aft to adjust the balance of the tow vehicle. The towing arm also includes a safety release
CAUTION!
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