2205 System Technical and User’s Guide
Document : 0022175 Rev A Page 25
open (but not remove) the housing’s pressure port plug BEFORE attempting to open the pressure
housing. Injury and/or damage to the housing can occur if the internal pressure is not first released.
11.3 Sea Ground
The internal electronics are grounded to the housing’s connector end cap. For proper operation, the
pressure housing and arrays must be placed in a body of water (ocean/lake) or connected to an earth
ground rod (electrical outlet ground lug is not acceptable). This ground will minimize noise within the
system and maximize data quality. Unless otherwise requested, the internal connection between the
electronics and the end cap (sea ground interface) is a parallel RC combination. If the intended vehicle
cannot accept a DC path from the EdgeTech system, the internal sea ground can be ONLY capacitively
coupled to the bottle/sea ground interface.
11.4 Side Scan Arrays
The side scan arrays (0018633) are installed at a nominal 24-27 degree look down angle relative to the
horizontal ocean surface. There is a direct correlation between the spacing of the two side scan arrays,
height off the bottom and the nadir or dark region beneath the vehicle. With the aforementioned array
installation angle, there is minimal acoustic interaction with the ocean/lake floor directly beneath the
vehicle (nadir region). As each sensor operates independently, the spacing between sensors does not
impact the left/right acoustic images but, coupled with the height off the bottom, the spacing does impact
the region beneath the vehicle that is not covered. It is not possible to calculate the actual proper spacing
without knowledge of the installation platform or user requirements. Spacing between the side scan
arrays is left to customer discretion but should be kept to a minimum. EdgeTech can provide guidance as
needed.
The arrays can be installed with the connectors facing either Fore or Aft on the vehicle, unless
otherwise noted. The array’s long axis should be placed such that it is parallel to the vehicle track.
11.5 Sub-Bottom Assembly
The supplied sub-bottom system consists of two major components; transmit transducer (0011029) and
PVDF (polyvinylidene difluoride) acoustic receiver (0022774). The transmit transducer should be
mounted such that the neoprene face is at the same vertical level as the PVDF and in a position that is
forward of the panel by a nominal distance of 9 inches (22.86cm), edge to edge. The PVDF should be
positioned such that the flat surface is parallel to the ocean bottom. The PVDF should be mounted to a
rigid backing with a nominal thickness of 0.25 inches (0.63cm) to prevent it from flexing. The transmit
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