6 reducing sea clutter, 7 adjusting rain clutter, 8 setting lcd contrast – Network Computing Devices JRC 1500 MKII User Manual

Page 33: 9 setting dimmer, Caution

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4.6

REDUCING SEA CLUTTER

The SEA CLUTTER control is normally only used on the shorter ranges to

suppress the effect of sea clutter formed by breaking wave crests which the

radar “sees” as solid objects.

Press the J-DIAL until the SEA appears highlighted in the upper right corner of

the display. Rotate the J-DIAL clockwise, or counterclockwise to vary the sea

clutter control and thus control the strength of echo returns from the sea sur-

face. The on-screen bar indicates the selected level.

4.7

ADJUSTING RAIN CLUTTER

Press the J-DIAL until the RAIN appears highlighted at the upper right corner

of the display. Rotate the J-DIAL clockwise or counterclockwise, to vary the

level and thus control the strength of echoes returned from rain or snow. As you

rotate clockwise, the returned echoes will become narrower and the returns

from rain or snow will be reduced.

4.8

SETTING LCD CONTRAST

Press the CONT/DIM key, and then rotate the J-DIAL clockwise or counter-

clockwise to change the display contrast.

4.9

SETTING DIMMER

By pressing the CONT/DIM key, the back light for the LCD and the panel

illumination can be varied in intensity. This function has only the two settings

“ON” and “OFF”.

OPERATION

Increasing the SEA CLUTTER control effectively diminishes the

radar’s sensitivity. SEA CLUTTER should never be advanced to

the point where it obliterates all returns from waves, since this

setting could prevent the detection of nearby targets, especially

small wood/grp boats and yachts approaching head-on.

CAUTION

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