Raymarine ST50 plus Specifications download pdf (Page 36)

ST50 PLUS RADAR Operation and Installation Handbook

(5)

GAIN

The GAIN control can be selected between “AUTO” or “MANUAL”

mode.

This item selects the receiver gain sensitivity method for the

Radar. If Manual is selected the GAIN Control on the front panel

is used and the GAIN Bar indicator reacts to front panel changes.

The AUTO gain mode will automatically adjust the radar for

optimum sensitivity whenever the radar is turned on or ranges

changed. Generally, the AUTO gain mode provides unattended

operation and should be selected. “A” appears to the right of the

GAIN Bar indicator.

(6) TRAIL

The TRAIL is displayed on the moving target in the TRAIL mode,

and SHORT TRAIL, LONG TRAIL or TRAIL OFF can be selected.

This feature allows the operator to see the past history of target

movement as an after-glow or “TRAIL” behind the moving targets.

The OFF selection inhibits this function. The “SHORT” enables

“TRAILS”, placing a short after-glow behind the moving targets.

The “LONG” enables “TRAILS” with a longer after-glow.

If range scales are changed, the trails are cleared and new trail

histories must be redrawn to the screen.

The trails are drawn for anything that moves on the screen,

including sea gulls, sea clutter, buoys, lobster pots, and shoreline.

In general it is better to use the trail feature away from harbors and

the shoreline to avoid a cluttered display and concentrate on trails

of target vessels.

(7)

(Interference Rejection) mode can be set to “OFF” or “ON”. The

IR reduces noise on the display caused by other radars operating

nearby in the same frequency band. This function is also effective

in reducing some background noise. When active, the “IR”

characters are displayed in upper window on the screen.

Section 3. Operation

3-23

If you are navigating in a port area serviced by a “RACON” beacon,

you should turn off the IR mode to see the RACON signals.

(8) EXPANSION

Target Expand mode can be set to “OFF” or “ON”.

The target expand mode allows the operator the ability to make

small targets appear larger on the display for better viewing.

When active, “EXP” characters are displayed in the upper left

window on the screen. This function enlarges all targets so use

of expansion mode might want to be limited to only certain

occasions on the display.

(9)

WAYPOINT

The

WAYPOINT

mode can be set to “OFF” or “ON”.

When active and the radar is connected to a NAVAID with the

necessary data output, a waypoint symbol at the bearing and

range to the selected waypoint can be presented on the radar

display. Numeric data, showing bearing, range and time to

target, appears with “WPT” characters in the upper right side of

the screen. If the way point is not within the selected range scale

of the radar, only the dashed line indicating the bearing to the

waypoint can be displayed. When waypoint appears on the range

scale in use, the

waypoint

is displayed as a

with the center town

ship) and the waypoint interconnected by a dotted line.

Should data be lost from a heading sensor or NAVAID, the

waypoint mode will disable and the message “NO DATA” will

appear on the display.

The waypoint mode cannot be used if there is no course data from

a NAVAID or magnetic sensor.

When using the waypoint mode on higher speed vessels the

waypoint symbol will tend to lag behind the actual waypoint. Often

this condition is due to lag in getting data from NAVAID and is more

noticeable on the shorter range scales.

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Raymarine ST50 plus Specifications Page 36

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