Eagle Electronics 500CDF manual

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2.Electrical noise from the boat's motor can interfere with the sonar. This causes the sonar to automatically increase its Discrimination or noise rejection feature. This can cause the unit to eliminate weaker sig- nals such as fish or even structure from the display. Try using resistor spark plugs or routing the sonar unit's power and transducer cables away from other electrical wiring on the boat.

No fish arches when the Fish I.D. feature is off:

1.Make certain the transducer is pointing straight down. This is the most common problem if a partial arch is displayed.

2.The sensitivity may not be high enough. In order for the unit to dis- play a fish arch, it has to be able to receive the fish's echo from the time it enters the cone until it leaves. If the sensitivity is not high enough, the unit shows the fish only when it is in the center of the cone.

3.Use the Zoom feature. It is much easier to display fish arches when zoomed in on a small range of water than a large one. For example, you will have much better luck seeing fish arches with a 30 to 60 foot range than a 0 to 60 foot range. This enlarges the targets, allowing the dis- play to show much more detail.

4.The boat must be moving at a slow trolling speed to see fish arches. If the boat is motionless, fish stay in the cone, showing on the screen as straight horizontal lines.

Noise

A major cause of sonar problems is electrical noise. This usually ap- pears on the sonar's display as random patterns of dots or lines. In se- vere cases, it can completely cover the screen with black dots, or cause the unit to operate erratically, or not at all.

To eliminate or minimize the effects of electrical noise, first try to de- termine the cause. With the boat at rest in the water, the first thing you should do is turn all electrical equipment on the boat off. Make sure the engine is also off. Turn your sonar on, then turn off Noise Reject [also known as the ASP feature (Advanced Signal Processing)]. Sensi-

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Contents Installation and Operation Instructions Page Table of Contents ColorLine level To turn Auto Sensitivity back on Page How this manual can get you out on the water, fast Read Me FirstPage Figuration and installation, bottom composi How Sonar Works How to Use this Manual Typographical Conventions Page Preparations Transducer InstallationSingle-frequency transom installations Pad Deadrise less than Strakes Good and poor transducer locations Transom Page Dot Alignment letters Positions Transducer Ratchets Bolt Transom Bottom Hull Flat-bottom hull Deep-vee hull Internal tooth washer TMB-S bracket Bolt Nut Flat washer Transducer mounted on trolling motor, side view Partial fish arches Hulls With Flotation Materials Transducer location High speed Trolling speed Page Epoxy transducer to hull Speed/Temperature Sensors Optional Speed Sensor Installation Good location Power Connections Power connections for the sonar unit Page Front 72.9 173.9 23.4 157.9 Millimeter 56.9 Inch In-Dash Template Face Cover Page Keyboard Basic Sonar OperationPower/lights on and off Main Menu Pages Pages Menu, showing Sonar display options Page Page Sonar Page, showing full sonar chart mode Basic Sonar Quick Reference Sonar Operations Page Page Important Tip Page Page Page ASP Advanced Signal Processing Sonar Options & Other FeaturesAlarms To adjust and turn on the shallow alarm To turn off the alarm, press ALARM↓ to Deep Alarm Enabledentexit Backlight Level Calibrate Speed Chart Speed ColorLine Thin or no ColorLine Wider ColorLine Depth Cursor ContrastDepth Range Manual Depth Range AutomaticFasTrack Fish I.D. Fish Symbols & Depths FishTrack Frequency Change Transducer Frequency SeaFinder CDF only Symbols with FishTrack depthsSonar Features menu with a frequency of 200 kHz selected Overlay Data HyperScrollNoise Rejection Page To return to the previous page, press Exit Tip Ping Speed & HyperScrollPage Pop-up Help Reset Options Set Keel Offset Reset Water DistanceScreen Contrast and Backlight Level Press MENUMENU↓ to SET Keel Offsetent Sensitivity & Auto Sensitivity Page Software Version Information Set LanguageSonar Page & Sonar Chart Display Options Sonar Chart ModePage Page Customizing the Digital Data/Chart Screen Sonar Simulator Stop Chart Surface Clarity Press ↓ or ↑ to select clarity levelEXITEXIT Units of Measure TransparencyZoom & Zoom Bar VolumeZoom Pan Troubleshooting Page Page Page Supplemental Material FCC Compliance Page Index Page Page 102 103 How to Obtain Service… Accessory Ordering Information for all countries Visit our web site