Types of transducers & how they work

Although many fish finder models are sold with the transducers, they can also be purchased separately, and the fish finder can be used with many different types of transducers.

Different transducers work at different frequencies, which means you must choose the correct frequency for a specific application. For freshwater sports fishing, the frequency range is 50 kHz to 300 kHz, with 200 kHz being the most common.

Transducer mounting style

Different types of transducers require different installation methods:

In-hull: Some transducers do not need to be in direct contact with the water because they can transmit sonar through the hull. They can be glued inside the hull. However, they are not suitable for all types of hulls, so make sure to check before buying.

Transom-mount: This is the most common type of transducer installation. It relies on an adjustable bracket that is fixed on the outside of the hull, usually at the back end of the boat or kayak. With this installation, the transducer is inserted into the water.

Selection for transducer installation location is depending on the boat’s shape and speed. The following is the best recom- mended installation location for different type of transducers. The real situation should be considered when installation.

• For the displacement type power boat 1—Propeller interference is the main factor. It is recommended that the transducer be installed in the front of the boat, no more than 1/3 of the length of the hull in the water.

• For boat with a bulbous nose and a bow thruster 2, the transducer is usually installed in the bow area or below the nose of the nose, and in front of the head thruster.

• Small boat with motor at the end and aft-driven boat 3—The transducer should be installed in front of the engine

• and close to the engine.

Inboard driven boat 4—The transducer should be installed in front of the engine propeller shaft and away

• from the propeller shaft.

Stepped hull 5—The transducer should be installed in

front of the first step.

• Full keel sailboat 6—The transducer should be installed

on the belly of the boat, far away from the keel, and at the

minimum angle of the bottom of the boat.

• Finned keel sailboat—The transducer should be installed

in front of the keel and next to the centerline.

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