Furuno FAR-2107 Series Service Manual page 448

ES3
4-3 Signal processing (EAV: ECHO AVERAGE)
This setting is in OFF/1/2/3 of [PICTURE] box menu.
Used for displaying target signals by distinguishing them from unwanted signals of
sea clutter, rain and others.
- EAV-1
Used for displaying target signals by distinguishing them from unwanted signals of
sea clutter, rain and others.
- EAV-2
Used for displaying target signals by distinguishing them from pictures of strong
sea clutter, rain and others. With its strong force to suppress the signal strength of
sea clutter, rain and others, it has a strong control force and may suppress weak
target signals. EAV-2 and EAV-1 should be selectively used depending on the
strength of unwanted signals.
- EAV-3
Used for displaying a target in highlight.
Since this feature allows displaying a weaker target by increasing its intensity, it is
used for enhancing the sensitivity particularly of a target in a long distance. Since
unwanted signals of sea clutter, rain and others are also emphasized, video
adjustment is required to remove unwanted signals.
Fig. 7.3.12(2/2) Examples of ES pictures
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7.3 Processor Unit (RPU-013)