How To Choose Transducer For Fish Finders

Those who have no ideas about working and activity ways of fish finder transducers, would find it challenging to understand initially. The functionality of your fishfinder largely depends upon the transducers as the sound it releases and the echo it receives back, works full length in measuring where exactly fish are moving. Whether the transducers are used with ´╗┐portable fish finders or fixed mount, it is fundamental for you to know all relevant aspects so that you can have the best fishing experience ever.



  • Transducers are accessible with both frequencies high as well as low. Those, which are high frequency models usually, vary from 180 to 200 kHz and high ones range from 50 to 100 kHz.
  • If you are wondering why one would opt for lower frequency Transducers, well the lower ones can travel through wider distances. Lower frequency comes with great penetrating capability so it may get into greater depth.
  • Now all sorts of fish finders work with certain frequency measurements and so it is not you but your fish finder which is going to determine which transducer will work best.
  • They come in a compact set and if you are buying your transducers separately on your own then make sure your fish finder model is capable of working with it with highest capability.
  • Following guidelines, going through instructions is really mandatory to understand the working of correct transducers, no matter with which you are working portable one or those which can be mounted


  • Transforming sound into beam and releasing the beam into the water thus a transducer works and this beam is released through a small arc. Now the deeper arc goes the wider it spreads and now if you design the penetration of the arc on the graph paper then it will look like a cone angle.
  • If you are seeking to determine the centerline of the cone, then you can very well draw a line from the tip of the cone to the bottom of the cone and this straight line is identified as the cone line.


  • The emitted beam, emitted sound or whatever you call it is stronger near to this center line and it fades, the more it spreads. So distance from center line will strip off the strength of this beam.
  • A transducer works by concentrating sound wave into a beam and emitting this beam into the water. This beam is emitted in a small arc (measured in degrees) from the transducer. As the beam travels deeper into the water, the arc covers a wider area.
  • If you draw the area that the beam covers on graph paper, it will look like a cone, thus the term "cone angle" applies. If you draw a line from the very tip of the cone down to the cone bottom you will identify the center line of the cone.

When Frequency works with Cone Angle

  • When you are dealing in shallow water you will be in need of that model which has high frequency (180 - 200 kHz), narrow cone angle (20 degree - 30 degree).
  • Here you will not be able to have great depths, here you will be able to see things more crisply on narrow cone angle and you will be able to differentiate objects on the display.
  • When you have gone for deep water fishing, here you can go for highest volume of water possible, here you can take account of low frequency (50 - 100 kHz) for wider depths and wide cone angle for larger horizontal distances. The arrangement permits you to observe at greater depths, but the definition as per as crispiness is concerned will not be adequate.
  • But you can enhance the definition by purchasing a fish finder with greater sensitivity display.


On the whole, fishfinders are available with different choices and transducer is one of the key components of fish finders. Before dealing in transducer or fish finder make sure what fishing experience you are looking for deep fishing or shallow.

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