ST50 PLUS RADAR Operation and Installation Handbook
Note: Pressing the
[G-l
key at the same time while turning
the radar to standby will perform a Soft Master Reset to the unit
in the event that a “lock up” condition should occur. A Soft
Master Reset will NOT reset the radar’s initial settings (i.e.
bearing, STC, tune, timing . ..). In order to perform the Soft
Master Reset, shut the Radar System OFF. Hold down
the
-1
key; then-press
the[m!
key to place the unit in
ST-BY. Release the
F]
key. The Master Reset condition
is verified by observing that the total hour meter is reset to
OOOOHrs.
A Hard Master Reset can also be performed. This type of reset
will clear all memory including the radar’s initial settings. To
perform a hard master reset
press-1
Then press the
Im[
key. Release
the
1-1
key and then the
[?QWiGKj
key in order to Hard Reset the radar.
Section 3. Operation
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TUNE CONTROL
The tune control is used to tune the receiver in the antenna unit
for maximum targets on the display. If there are no targets
available, this control can be used to tune for maximum sea
clutter. The on-screen tune level indicator will show the tuning
peak condition by displaying a maximum deflection to the right.
The tuning adjustment of the radar should be normally performed
on the longer range scales from 3 to 16 nm but should always
be-
rechecked for peak indication on the range scale you are using.
Tuning is controlled by pressing the tune left or right keys for
maximum bars.
The minimum deflection of the tuning indicator will occur when
there are few or no targets. Minor retuning of the radar may be
necessary after the radar has warmed up 10 minutes. The 10
minutes accounts for time to allow the magnetron frequency to
stabilize.
AUTO TUNE MODE
The Radar includes an Automatic TUNE Feature. In the Automatic
mode, the radar tunes itself automatically on all range scales.
Auto Tune is available by pressing
thell
key Cl+). Use the
Arrow key to Select Tune . . . Auto with the highlighted Cursor.
Pressmj
to activate Tuning Mode. The Manual mode is
indicated by the “Tuning Bar”and the Automatic mode is indicated
by an “A” after it.
RAIN CLUTTER CONTROL
The Auto or Manual rain clutter control, also known as Fast Time
Constant (FTC), is used to reduce large undesirable echoes from
clutter such as rain or snow which may obscure smaller echoes
in their vicinity. The rain clutter control is normally adjusted to
reduce such echoes so that only the leading edges of the larger
echoes are displayed, while the smaller echoes are only slightly
effected. To reduce rain or snow target pickup, press
theI-
key until rain details are reduced. To turn off rain press the
rain
w\until
the bars are gone. To turn ON auto rain
pressmMENUj
and select RAIN AUTO . Press the
mj
key
again to return to the radar display, the automatic mode is
indicated by an ‘A’ next to the RAIN bar graph. In manual control
mode if the rain clutter is advanced too far, some small, weak
targets may be suppressed by the controls effect.
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