Soft, low density objects return a weaker signal, whereas hard, high-density objects return a stronger signal. This enables it to show how hard or soft the underwater objects are. Sonars measure both the time it takes for a sound pulse to return, but also the strength of the signal that returns too. Your sonar is capable of telling you not just what the bottom structure looks like, but how hard the bottom is as well. The Deeper PRO+ 2, CHIRP 2 have the least amount of surface noise and clutter, providing accurate readings up to 15 cm / 6" from the water's surface. In the case of the Deeper START, its 120 kHz sonar frequency means surface clutter can reach down to 1 meter / 3.3 ft. So, if you have a Deeper PRO or PRO+ and you are experiencing a lot of surface clutter, switch to scanning with the higher frequency ( Narrow beam at 290kHz 15°). The amount of clutter, and the size of this blind zone, can be reduced if the sonar frequency is higher. This creates a “blind zone“ in which it is not possible to identify fish. The result is lots of “sonar noise” close to the surface. This reflection has numerous causes, the most common being waves on the surface, bubbles, currents and algae. Surface clutter appears because the water close to the surface will reflect some of the sonar waves, and these reflections are much too fast for the sonar to process correctly. The cause of this is what’s known as surface clutter, which is common to all sonars. Narrow beam scanning is also better suited for deeper water, as the cone does not spread as wide.Īnother factor to consider related to your sonar cone width is that in some cases you will not be able to detect objects just below the surface of the water. It is better for finding the exact location of fish. Narrow beam scanning (around 10° to 20°) gives a more precise picture but covers a smaller area. This means if you are scanning at a depth of 45ft / 13,7 m you will see objects in an area that has a 47ft / 14,3 m diameter. Wide beam scanning is best suited for shallower waters because the cone covers a wider area, the deeper it scans. Wide beam scanning (usually 40° to 60° angle) is good for quickly scanning large areas and geting overall information on depth and bottom structure, but the accuracy and detail will be lower. This is important because in different fishing situations different scanning beams will be more or less effective. Most sonars can control the range of the sound wave cone by changing the scanning beam frequency. Sound travels in waves, not straight lines, and these waves expand in cones, getting wider and wider. Sonars send out pulse of sound to locate objects. The returning sound pulses are converted into electrical signals and then displayed, showing anglers the depth and hardness of the bottom and any objects in between. The Deeper PRO, Deeper PRO+, Deeper PRO+ 2, and Deeper CHIRP 2 send 15 pulses per second. Because sound waves travel at roughly one mile a second in water, sonars can send multiple pulses per second. Once a returning pulse is received, another one is sent out. It also measures the strength of the returning pulse – the harder the objects, the stronger the return pulse. This information enables the device to judge the depth of the object it reflected off. It’s the same echo-location system bats and dolphins use. The sonar device measures how long it takes for the sound wave to travel down, hit an object and then bounce back up. When these pulses hit objects like fish, vegetation or the bottom, they are reflected back to the surface. A sonar device sends pulses of sound waves down through the water. SONAR stands for SOund NAvigation Ranging.
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