Transom Transducer Installation - Humminbird 917C Installation And Operation Manual

Transom Transducer Installation

If you will be installing a transom mounted transducer, use the procedures
in this section. There are several procedures you will have to perform in order
to install a transom-mounted transducer. They are:
• Locate transducer mounting location
• Prepare the mounting location
• Assemble the transducer and perform initial mounting
• Route the transducer cable
• Connect the transducer cable
• Perform a final test of the transom transducer installation.
1. Locating the 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.
Turbulence: You must first determine the best location on the transom to
install the transducer. It is very important to locate the transducer in an area
that is relatively free of turbulent water. Consider the following to find the
best location with the least amount of turbulence:
• As the 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" to the side of the propeller(s).
Areas of Possible Turbulence
Rivets Strakes
Transom
• 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.
15"
Find a turbulence-free location at least 15" from the propeller(s)
and not in line with trailer bunks or rollers.
13
Stepped Hull
Step
Hull
Rib
Level