Onwa KF-667 manual Display mode description, 200K, 50K high frequency, low frequency mode

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2.3.2 Display mode description

200K, 50K (high frequency, low frequency) mode

The sounder uses ultrasonic pulses to detect bottom conditions. The lower the frequency of the pulse the wider the detection area. Therefore, the 50KHz frequency is useful for general detection and judging bottom conditions, while the 200KHz frequency is useful for detailed observation of fish schools.

DUAL frequency mode

This mode provides the 50KHz picture on the left-half of the screen and the 200KHz on the right half, and is useful for detecting fish schools which have different reflection characteristics with frequency. For example, a school of tiny fish like minnow returns stronger echoes on a high frequency compared to a low frequency.

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Contents Model KF-667 Safety Instructions Table of Contents Introduction FeaturesPage Principle of Operation Display Unit System ConfigurationTransducer PowerTD/Temp Control Function CONTROLS, IndicationsBrill Voltage IndicationsAdjusting Brilliance Turning the Power On/OffDisplay Mode Selection, Description Display mode selection200K, 50K high frequency, low frequency mode Display mode descriptionDual frequency mode Marker Zoom Zoom mode high or low frequencyAutomatic Operation Adjusting GainHow it works Enabling automatic operationDisplay Range Selection Selecting Picture Advance SpeedBasic range selection Range shifting Erasing Weak EchoesScope Display Measuring Depth to a Fish SchoolMenu selection Menu OperationSystem Menu Main menu descriptionMenu item Description System Menu System menu descriptionSuppressing Low Level Noise Suppressing InterferenceAlarm description AlarmsSelecting Background and Echo Colors Silencing the buzzer Activating/deactivating an alarmWhite Marker Zero Line Interpreting the DisplayFish School Echoes Bottom EchoSurface Noise/Aeration Maintenance MAINTENANCE,TROUBLESHOOTINGReplacement of fuse General checkingMaintenance of the transducer CleaningBasic troubleshooting Basic TroubleshootingTransducer Check Water Temperature Sensor option CheckMENU1 Menu TreeKF-667 Specifications on Color Video SounderPower Supply Index