![]() Here are some simple and easy-to-follow steps to target and then address the problems you may be having. *Being able to pinpoint the type of interference you have will be the first step in getting a clearer sonar signal in all waters and conditions. As trolling motors get more and more powerful, the noise gets worse and worse, overwhelming the cable shielding and noise reduction circuitry that is used to protect sonar from this type of interference. ![]() It is then absorbed into the transducer cable that’s attached to the trolling motor. ![]() EMI is radiated from the trolling motor’s lower unit and power wiring into the air. Electromagnetic Interference (EMI) is created by the powerful electric trolling motors on the market today.The noise is conducted through the power line and enters your depth finder through the power connection. This noise will be evident only when the trolling motor is activated and can vary in intensity through the range of motor speeds. Conducted Interference is usually caused by electric trolling motors that incorporate Pulse Width Modulation (PWM) in their speed control.These are power spikes that travel through the power wiring and into your sonar, causing noise to be displayed on the screen or heard on your radio. Ignition Interference comes from engines that introduce ignition noise into the power circuitry.When two depth finder’s transducer cones intersect, each unit will get confused as to which signals are which. It will show itself as lines rotating around the dial of a flasher or diagonal lines across the screen of a graph. Sonar Cross-Talk Interference is created by another sonar of similar transmit frequency nearby.This applies to transom and in-hull mounted transducer applications. It’s caused by an uneven, or turbulent, water flow across the face of the transducer. You will see this noise on the screen only when the boat is traveling across the water, at or beyond the plane speed of the boat. Acoustical Interference is caused by faulty transducer installation.They will all look similar on your screen and distract from your ability to get a clear picture of the bottom below, but the remedy for each is quite different. Also, understand that although most noise can be eliminated with fairly simple techniques, some can only be reduced to a more acceptable level.įirst off, understand there are five different types of interference problems you may face. To combat interference, you must first identify which type of noise is giving you trouble. Severe noise can completely fill the screen, making simple depth readings impossible. Minor interference, or noise, can be stray signals that can look like actual targets. Interference shows itself on the display of your depth finder with varying degrees. In the world of marine sonar and the modern-day angler, there is no doubt that as the electrical systems in today’s boats get more complicated, the chance that your electronics will experience interference problems increases.
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