Onwa KF-667 manual Adjusting Gain, Automatic Operation, How it works, Enabling automatic operation

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2.4 Adjusting Gain

The [GAIN] control adjusts the sensitivity of the receiver. Adjust it so that a slight amount of noise remains on the screen. Generally, use a higher gain setting for greater depths and a lower setting for shallower waters.

Note: The [GAIN] control is inoperative when the automatic mode is active.

Gain too high Gain proper Gain too low

2.5 Automatic Operation

Automatic operation is useful when you are preoccupied with other tasks and do not have time to adjust the display.

2.5.1 How it works

The automatic function automatically selects the proper gain and range scale according to depth. It works as follows:

The range changes automatically to locate the bottom on the lower half of the screen. It jumps to one step shallower range when bottom echoes reach a halfway point of the full scale from top and to one step deeper range when they come to the lower edge of the scale.

The gain is automatically adjusted to display the bottom echo in reddish-brown (default color arrangement).

Clutter level (on the main menu), which suppresses low level noise, is automatically adjusted.

2.5.2 Enabling automatic operation

Two types of automatic modes are available:AUTO1,for fishing, and AUTO2,for cruising. Since cruising uses a higher clutter rejection setting than fishing, it is not recommended for detection of fish because weak fish echoes may be deleted by clutter rejection. Note that the [SHIFT] keys([+],[-]), [RANGE] switch and [GAIN] control are inoperative in the auto mode.

Press the [AUTO] key. Each press of the key turns the auto function on or off in the sequence shown below

AUTO-1

AUTO-2

AUTO OFF

(FISH MODE)

(CRUISE MODE)

 

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Contents Model KF-667 Safety Instructions Table of Contents Introduction FeaturesPage Principle of Operation Display Unit System ConfigurationPower TransducerTD/Temp Control Function CONTROLS, IndicationsBrill Voltage IndicationsDisplay mode selection Turning the Power On/OffAdjusting Brilliance Display Mode Selection, DescriptionDisplay mode description 200K, 50K high frequency, low frequency modeDual frequency mode Marker Zoom Zoom mode high or low frequencyEnabling automatic operation Adjusting GainAutomatic Operation How it worksSelecting Picture Advance Speed Display Range SelectionBasic 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 InterferenceAlarms Alarm descriptionSelecting Background and Echo Colors Silencing the buzzer Activating/deactivating an alarmWhite Marker Bottom Echo Interpreting the DisplayZero Line Fish School EchoesSurface Noise/Aeration General checking MAINTENANCE,TROUBLESHOOTINGMaintenance Replacement of fuseMaintenance of the transducer CleaningBasic troubleshooting Basic TroubleshootingTransducer Check Water Temperature Sensor option CheckMENU1 Menu TreeKF-667 Specifications on Color Video SounderPower Supply Index