NorthStar EXPLORER 650 Installation And Operation Manual

Also see for EXPLORER 650: Dimensions

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NorthStar EXPLORER 650 Installation And Operation Manual Manual pdf 39 page image

39Northstar Explorer 650 Installation and Operation ManualThis display is called the gain window.8-6 Gain and thresholdGain and threshold settings control the amountof detail displayed on a sonar display:Gain: The gain of the sonar receiver. The gainshould be high to display good detail, but if thegain is too high then information from the strongbottom signal is lost and false echoes might bedisplayed. There is a separate gain setting foreach sonar frequency, 50 kHz and 200 kHz.Threshold: Return echoes less than thethreshold are ignored. The threshold should beas low as possible, but if the threshold is too low,unwanted noise will be displayed. Threshold isset as a percentage of gain. For example, if thethreshold is 50 %, then return echoes less than50 % of the maximum signal are ignored. Thereis a separate threshold setting for each sonarfrequency, 50 kHz and 200 kHz.The gain windowTo display or change the current settings for gain,select a sonar display and press . SelectThreshold to display the thresholds.Changing modeThe Explorer has three operating modes, InCruising and Fishing modes, the Explorerautomatically adjusts gain and threshold for goodperformance. In manual mode, you can handadjust the settings.To change the mode from the Gain window,Select Mode and then select Fishing,Cruising or Manual. When you selectManual, the Explorer reverts to your last manualsettings.Changing gain and threshold1 In the Gain window, press or to selectthe setting to adjust.2 Press or adjust the setting. TheExplorer changes to Manual mode.Tip: Use the A-scope display to help set gainor threshold manually (see section 9-5).