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50-200KHZ TRANSDUCERS

STANDARD TRANSDUCERS 50-200KHZ


In this presentation we intend to offer a short guide, starting from the basics of transducers.

Mounting type
Transom mount transducers, suitable for small boats with one engine, not recommended for boats with two engines
Thru-hull transducers with fairing blocks offer the best performance, especially at high speeds.
Thru-hull transducers are ideal for towing vessels where good performance is required and there are no protrusions from the hull.
Internal transducers are fixed directly inside the hull but performance is significantly reduced.

Transducer output power
Output power refers to the intensity at which the transducer sends signals, expressed in watts RMS. They are mainly divided into 600W and 1kW transducers.
Higher power increases the chances of obtaining returns in deep water or poor visibility. It also allows you to see more detail, such as small fish and structure.
Typically, the higher the power, the greater the depth you can reach, as well as achieving maximum target separation by eliminating surface clutter.

Frequency
The accuracy with which the fishfinder locates the bottom and other objects is also determined by the frequency selected based on the depth.
In this presentation we will focus on two frequencies: 50 kHz (low) or 200 kHz (high).

200kHz (high)
The 200 kHz frequency is used for shallow water and is used to obtain more accurate readings at high speeds. When using this frequency, the transducer scans a smaller area but displays greater detail. Typically, fewer unwanted echoes and less clutter are displayed, resulting in greater target definition.

50 kHz (low)
This frequency is used in deep waters. Water absorbs ultrasonic pulses at a slower rate, and larger areas can be covered before the signal becomes too weak. This results in a wider cone angle, allowing for a larger portion of the seabed to be scanned. However, this also means less definition and target separation, and more noise. While low frequencies allow for deeper exploration of the water column, they can also result in a less clear image of the seabed.

In general, you should use the 200 kHz frequency for a detailed image in shallow water and then switch to the 50 kHz frequency for greater depths.
The ideal solution is to display both frequencies on a split screen.

Angles of the cone

The transducer focuses the transmitted waves into a beam. In theory, the pulses are radiated in a cone that widens as the wavelength increases.
of the depth. In reality, the shape of the beam varies depending on the transducer and generally the pulses are also radiated outside
thus producing the sidelobes. The following figures show a representation of the actual path taken by the pulses.
However, for our purposes, we'll consider the image of a cone. The signal is strongest along the center line.
of the cone and gradually decreases as we move away from the center.
Wider angles show a larger portion of the seabed at the expense of resolution, because they disperse the power of the
transmitter. A smaller cone can concentrate more transmission power in a smaller area. The angles of the cone
They are wider at low frequencies and narrower at high frequencies.
To summarize, a larger cone can detect not only fish directly under the boat but also
the surrounding ones but with a lower target separation.

A narrower cone focuses the transmitted energy to more precisely locate small details, such as fish or bottom structure, but examines a portion
of lower water.

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