4.4
Initialize Setting
Initialize Setting Initialize Setting
Initialize Setting
4-15
4.4.3 DEFAULT ANT HIEGHT, NEAR/MID/FAR STC CURVE
INITIALIZE -> 2: ECHO -> 6, 7, 8, 9
Parameters determining the STC curve are listed below.
Table 4.4.1 Setting Values Related to STC Curve
Item Setting Parameter Default Remarks
MODEL INITIALIZE->4->6
X band: 6/12/25UP/25DOWN
S band: 50/30UP/30DOWN/60
X band
At
installation
STC RANGE [PICTURE]->9->4 -10 - +10 + 0
SEA CONDITION [PICTURE]->9->2 1/2/3/4/5
Depends
on
Picture
ANT HIEGHT >
DEFAULT ANT
HIEGHT
[PICTURE]->9->3,
INITIALAIZE->2->6
5/7.5/10/15/20/25/30/35/
40/45/more 50m
15
At
installation
NEAR STC CURVE INITIALIZE->2->7 2/2.5/3/3.5 3
MID STC CURVE INITIALIZE->2->8 3/4/5/6 4
FAR STC CURVE INITIALIZE->2->9 6/7/8
Note
7
Set the antenna height for the setting of DEFAULT ANT HIEGHT, by “[PICTURE] ->
9 -> 3: ANT HIEGHT”. The STC curve is primary set by ANT HIEGHT.
The STC control is executed by the IF board of the TR unit.
Fig 4.4.1 STC Curve
By adjusting the [A/C SEA] knob, the STC curve moves up and down. The ANT
HIEGHT, SEA CONDITION and pulse length determine turning points of the curve.
And the setting of the STC RANGE changes the turning points of MID STC and FAR
STC. The higher is the antenna and the worse is the sea condition, the more the control
distance of (1<5) STC is extended.
For instance, if the antenna height is 30 m for the X-band radar, the NEAR turning point
is 4 to 5 NM and the MID turning point is 19 to 20 NM. In AUTO STC, the optimum
STC curve and movement of STC curve (upward and downward) are automatically
controlled according to a reception signal level and Range.
Near STC Curve
(2/2.5/3/3.5)
MID STC Curve
(3/4/5/6)
Far STC Curve
(6/7/8)
Gain (-)
Range
Limit: 24NM
[GAIN] VR ADJ
[A/C SEA] VR ADJ
STC RANGE
(+10)
The STC effective range is
restricted up to 24 NM by the RFC
board. The larger is the gradient
coefficient of the STC curve, the
larger are the changes
in attenuation.
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