1-7
1.3.2.2 4200-MP Tow Vehicle
The 4200-MP Tow Vehicle enables higher survey speeds while maintaining full bottom coverage. It is
available with a choice of 100/400 kHz, 300/600 kHz, or 300/900 kHz dual linear FM chirp operating
frequencies. The tow vehicle includes identical port and starboard forward-mounted and aft-mounted
transducer arrays, where each includes a high frequency and low frequency transmit/receive element.
The tow vehicle operates in either High Definition Mode (HDM) dual-frequency, single pulse-operation,
similar to that performed by the 4200-SP Tow Vehicle, or High-Speed Mode (HSM) dual-frequency multi-
pulse operation. For the high-frequency operation in HDM, the aft transducer arrays both transmit and
receive, while the forward arrays are not used. For low-frequency HDM operation, the forward and aft
transducer arrays both transmit and receive. For both the high and low-frequency operation in HSM, the
port and starboard forward transducer arrays transmit, while the port and starboard aft transducer arrays
receive. Also, for HSM operation, two pulses are in the water at any one time for each frequency. This
allows for tow vehicle speeds of up to 9.6 knots while still meeting the NOAA and IHO-44S Shallow Water
Survey Specification of three pings on a 1-meter cubed target with the range set at 100 meters.
The tow vehicle electronic includes four separate transmitters and four separate receivers. Received sonar
signals are digitized and transmitted to the topside processor over an ADSL link using a coax tow cable up
to 6000 meters in length. (contact E
DGETECH CUSTOMER SERVICE for questions concerning cable type vs.
lengths).
1.4 Tow Cables
The tow cables digitally connect the topside
processor to and tow the tow vehicle. They are
available in the customer’s choice of Kevlar-
reinforced or armored styles, and both types can
be terminated at both ends or just at the tow
vehicle end, depending on customer
requirements.
Both cable types include a single conductor and a
shield. They also include an MCIL6F female wet
pluggable connector on the tow vehicle end and
either an MCIL4M male wet pluggable connector
on the topside processor end or an open
termination at this end for direct connection to the
slip rings of a winch. A cable grip is included for
attaching the tow cable to the towing arm of the tow vehicle.
1.5 Optional Equipment
The following optional equipment can be installed and used with the 4200 Series High Definition Dual-
frequency Side Scan Sonar System:
Figure 1-4: Kevlar Reinforced Tow Cable
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