Raymarine ST50 plus Specifications download pdf (Page 32)

ST50 PLUS RADAR Operation and Installation Handbook

@ SEA CLUTTER CONTROL

The sea clutter control, also known as the Sensitivity Time Control

(STC), is used on the short ranges to suppress the effects of sea

clutter close to own ship by reducing the nearby gain. To set sea

clutter,press

the[Ejkeytoreduceclutter.Pressthe

mto

increase sea clutter. The sea clutter should be set to the point

where nearby clutter is reduced to small noise dots and small

target echoes can still be distinguished.

Note: On short range scales, the setting of the SEA

CLUTTER Control should never be advanced so high as to

completely obliterate all clutter, since this setting could

prevent the detection of close-in target echoes.

The SEA CLUTTER Control setting should always be checked and

readjusted as necessary after changing ranges or when ever sea

conditions change. It should also be noted that the GAIN Control

setting interacts with the SEA CLUTTER Control. That is; if you

reduce the Gain Control, less Sea Clutter control is needed. If you

increase the Gain, the Sea Clutter level may need to be reset.

Judicial use of these controls is important to assure that excessive

sea clutter or insufficient gain will not cause targets to be

overlooked or not displayed.

When the STC Control is adjusted for the optimum setting, a

crescent of clutter will probably remain toward the windward

direction. Excessive application of STC will create a target less

zone around and beyond the maximum range to which the clutter

extends. This could eliminate some desired echoes, particularly

if the

GAlN

Control is set so that a light speckled background is

notclearlyvisibleat longer ranges. In any event, small adjustments

of the GAIN Control the STC Control may be necessary to obtain

the optimum picture and target detection, in varying conditions.

To turn ON auto sea,

press]-]

and select SEA

m).

Press

the

1-1

key again to return to the radar display.The automatic

mode is indicated by an “A” next to the SEA bar graph.

Section 3. Operation

GAIN CONTROL

The gain control adjusts the gain of the receiver, by increasing or

decreasing the strength of the incoming video and noise. The gain

control level is usually set for the best target presentation on the

range scale selected

witha

slight noise speckle in the background.

In manual gain mode, the gain control level may be reduced

slightly on the short ranges for improved clarity, and increased as

necessary on the long ranges for more sensitivity. You should use

caution when setting the gain level. If the gain is reduced too

much, small or weak targets may be missed,

and if

the gain is set

too high, the LCD may be saturated with noise, making target

observation difficult.

To increase the gain, press the

key. To decrease it press

the

/%#i]

key.

To turn on AUTO GAIN, press

and select

GAIN AUTO. Press

theI\

key again to return to the rader

display. The automatic mode is indicated by an

“A”

next to the

GAIN bar graph.

HOLD KEY

This HOLD key is used to freeze the picture on the screen. In

HOLD mode, the SHM disappears and the word “HOLD” flashes

at the top of PPI. The HOLD mode will turn OFF automatically after

30 seconds or anytime by pressing the HOLD key again.

GUARD KEY

The

key

turns ON or OFF the radar’s Guard Zone feature.

The Guard Zone may

a zone completely surrounding thevessel

or a partial trapezoidal zone to monitor targets entering the

specified area.

The [?$jAf?@

key

turns the Alarm mode “ON”.

When the Alarm

mode is ON, “ALM” is displayed in the upper left window of the

screen.

The GUARD zone can be set by using the

touchpad

arrow keys at

the desired distances and bearings.

When the

[GUARDi

key

is pressed, the CURSOR mark is disolayed

on the screen. The Guard Zone is made by setting the Start point

and End point.

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Raymarine ST50 plus Specifications Page 32

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