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11
TRANSOM TRANSDUCER INSTALLATION
If you will be installing a transom mounted transducer, use the procedures in this section.
You will have one of two different types of transducer, based on whether you have a Single
(931c or 937c Combo) or a Dual (931c DF or 937c DF Combo) frequency 900 Series™ control
head. There are two pieces to the transducer mount assembly: the pivot, and the bracket.
The Single frequency transducer comes with a two-piece plastic bracket assembly, while
the Dual frequency transducer comes with a two-piece metal and plastic bracket assembly.
Find the correct procedures for your transducer type. There are several procedures you will
have to perform in order to install a transom-mounted transducer. They are:
• Determine transducer mounting location
• Mount the bracket to the boat (find the procedure for your transducer, either
Single frequency or Dual frequency)
• Attach the pivot to the transducer (find the procedure for your transducer, either
Single frequency or Dual frequency)
• Mount the transducer pivot assembly to the bracket (find the procedure for your
transducer, either Single frequency or Dual frequency)
• Adjust the running position of the transducer (find the procedure for your
transducer, either Single frequency or Dual frequency)
• Route the transducer cable
• Perform a final test of the transom transducer installation.
To determine transducer mounting location:
NOTE:If transom mounting is not possible because of a stepped hull or cavitation noise, and
you have a single layer fiberglass hull, In-hull installation is an option. See Inside the Hull
Transducer Installation for more information.
1. First, determine the best location on the transom to install the transducer.
Consider the following to find the best location:
• It is very important to locate the transducer in an area which is relatively free of
turbulent water. As a boat moves through the water, turbulence is generated by
the weight of the boat, and the thrust of the propeller(s) - either clockwise or
counter-clockwise. This turbulent water is normally confined to areas
immediately aft of ribs, strakes or rows of rivets on the bottom of the boat, and
in the immediate area of the propeller(s). Clockwise propellers create more
turbulence on the port side. On outboard or inboard/outboard boats, it is best to
locate the transducer at least 15" (380 mm) to the side of the propeller(s).
• The best way to locate turbulence-free water is to view the transom while the
boat is moving. This method is recommended if maximum high-speed operation
is a high priority. If this is not possible, select a location on the transom where the
hull forward of this location is smooth, flat and free of protrusions or ribs.
• The hydrodynamic shape of your transducer allows it to point straight down
without deadrise adjustment.
• On boats with stepped hulls, it may be possible to mount the transducer on the
step. Do not mount the transducer on the transom behind a step to avoid
popping the transducer out of the water at higher speeds; the transducer must
remain in the water for the control head to maintain the sonar signal.
• If the transom is behind the propeller(s), it may be impossible to find an area
clear from turbulence, and a different mounting technique or transducer type
should be considered (see Inside the Hull Transducer Installation).
Stepped Hull
Rivets/Strakes
1
Deadrise Angle
2
Step
3
1
2
3
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