Furuno CSH-23F/24F manual Adjusting Beamwidth, Setting F-shift data setting window Sonrbeam

Setting F-shift (data setting window: SONR•BEAM,

SONAR)

If interference cannot be suppressed by the interference rejector (IR) or Tx cycle, change the setting of F-SHFT from 1 to 2.

Noise limiter (data setting window: SIGNAL, SIGNAL

PROCESS)

Weak, unwanted reflections, colored light-blue or green, appear when the water is dirty, plankton layers exists, or due to ship’s noise. The noise limiter (NL) can reduce the effects of these unwanted reflections–raising the setting causes them to become bluish to background color. Normally a setting of 3 or 4 is suffi- cient.

Adjusting Beamwidth

Beamwidth can be adjusted at SONR•BEAM, BEAM on the data setting window.

Table 3-1 Beamwidth adjustment menus

Menu	Application
	Set to "0" for normal use. The higher the setting the
	narrower the beam. This control may be used
	together with the AGC and NL controls to suppress
HOR	sea surface reflections and seabed echoes.
	Note that when 2AGC function is on the horizontal
	beamwidth is adjusted at the 2AGC item on the
	data setting window. Settings AR and -4 to -1
	adjust the beamwidth.
	About 500m
	0
	1
	2
VER	3, 4

In order to reduce surface reflection VER controls upper part of the beam dents near own ship as shown the above.

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