Interphase Sonar Engine SE-200 Operation Manual page 27

speeds and on large boats the effect is negligible. On
smaller boats at high speeds the drag can effect the
steering. The effect increases as the boat's speed rises.
Boats with trim tabs can usually trim this out, but boats
without trim tabs may feel a pulling sensation toward the
transducer side of the boat.
A less intuative mounting location for the single thru-
hull transducer on a planing hull is on the centerline just
forward of midship. The goal in this mounting is to place
the transducer so that it is out of the water at planing
speed. As most transducers are aerated at planing speeds,
this removes the transducer from the water flow
preventing cavitation and steering problems. Most
applications for forward scanning sonar occur when the
boat is at low non-planing speeds including fishing and
navigating hazardous waters. Under these lower speed
conditions the transducer is in the water.
Installing the Thru-hull Transducer
♦
Drill a 1/8" pilot hole from inside the hull to assure
access to tighten the housing nut and clearance for
the transducer cables.
♦
Use a 1-1/16" hole saw and drill the hole from the
outside. Sand or clean the area around the hole,
inside and outside to insure that the sealing
compound will adhere properly to the hull.
♦
Remove the bronze hex nut from the housing and
cable.
♦
Uncoil the transducer cable and thread it through
the hole into the inside of the hull.
♦ ♦ ♦ ♦
Apply a 1/8" thick layer of sealant on the upper flat
surface of the transducer, bronze alignment pin and
fairing block (if used).
♦
From the outside of the hull, push the housing into
the 1" hole. Twist the housing slightly to squeeze
out excess sealant. Carefully confirm that the
transducer is aligned so that the BLUNT front end
is pointed directly toward the front of the boat.
♦
Install and tighten the bronze hex nut (allow for
swelling in wooden hulls) and remove excess
sealant from the outside to assure smooth water
flow over the transducer.
DANGER: Wood hulls and wood fairing blocks will
expand after the boat is put back into the water, so it is
important that the transducer be only hand-tightened
until the wood fully expands. Otherwise the wood
fairing block may crack.
SE-200B
The single SE-200B thru-hull transducer (T1-I200-032)
contains two phased arrays, one used to scan vertically and the
other horizontally. The transducer has two cables, one connected to
each array and each is color coded—green for the vertical array and
blue for the horizontal array.
Because this transducer scans horizontally, care must be taken
to locate it at a position where it can see 45 degrees either side of
the bow (see sketch at left with side and overhead views). The
horizontal scan plan is angled downward by 10º to minimize surface
clutter.
Can be mounted in front of a fin keel, or just off to the side of
the leading edge of the keel where unobstructed forward vertical and
horizontal views are available.
On deep full keel vessels (trawlers, etc) it is usually not possi-
ble to find a suitable location for a single transducer with the hori-
zontal scan. These vessels should install the SE-200C system with
two transducers.
SE-200B—90-Degree Vertical and 90-Degree Horizontal Scan
SE-200C
The SE-200C uses two thru-hull transducers, one mounted on
each side of the vessels keel to eliminate keel shading problem with
the horizontal scan and increase the total horizontal segment to
180º. The port side transducer has a single horizontal array and
connecting cable. The starboard side transducer has two phased
arrays, one for vertical scanning and the other for scanning horizon-
tally from the vessels bow to 90º off the vessels starboard bow. The
starboard transducer also has two connecting cables color coded
with green for the vertical and blue for the horizontal scan arrays.
These transducers must be mounted so that the bronze stems
are close to vertical AND they must be mounted at the same distance
back from the vessels bow so that both the starboard and horizontal
scans will match.. Fairing blocks are included with this model.
Starboard Transducer
Port Transducer
Starboard Transducer
SE-200C - 90-Degree Vertical and 180-Degree Horizontal Scans
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