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Chapter 3: Standard Radar Operations 3-7
Adjusting Gain, Sea
Clutter, Rain Clutter
and Tune
Adjusting Gain, Sea Clutter, Rain Clutter and Tune
Automatic adjustment of Gain, Sea and Tune is available, alternatively you
can set any of these parameters to manual and use the trackpad to adjust its
value. Rain clutter is adjusted manually using the RAIN or FTC control. GAIN,
SEA, RAIN and FTC areaccessed from theGAIN key;TUNE is accessed from the
MULTI key. We recommend that you leave the TUNE control in Auto mode.
Note: Gain, Sea and Tune can only be adjusted if the control is set to Manual
adjustment.
When you select manual GAIN, SEA or TUNE adjustment the soft key icon
shows a vertical sliderbar. As you press the trackpad, the value is indicated in
the slider.
When youswitch FTC or RAIN On,the softkey icon showsa verticalslider bar.
As you press the trackpad, the value is indicated in the slider.
If you change the settings, the new GAIN, SEA and TUNE modes (auto or
manual) and values remain set even when you turn the radar offand on again;
Rain and FTC are reset to Off at power-on. The status bar indicates which
controls are switched to Auto or On, as shown in Figure 3-6.
Figure 3-6: Radar Status Bar
➤ To adjust a parameter:
1. Select a range appropriate to the adjustment you wish to make. The opti-
mum Tune setting varies slightly for different ranges, depending on the
pulse width used.
2. Press GAIN or MULTI. The slider soft keys are displayed. The last-used
slider is highlighted (displayed in inverse video) to show that it is selected.
3. Press the required soft key so that the slider box is highlighted.
The TUNE andGAIN soft keystoggle the control between Auto andManual
mode. The SEA soft key toggles the control between Auto-Harbour, Auto-
OffshoreandManualmode.Ifyou selectManualmodethelastautosetting
is retained. You can only move the slider if the control is set to Manual.
GAIN
MULTI
D3936-3
RAIN SEA
MANUAL MANUAL
FTC GAIN
O
F
F
75%
50%
O
F
F
D3987-3
Gain, Sea and/or Tune set to Auto
Status Bar
FTC on
3nm
126°T
AUTO
WKS
FTC
EX
RC
GZ
IR
RR
1/2
H-UP
GST
Rain on
TM TV3
GAIN
MULTI
81186_3.book Page 7 Thursday, August 22, 2002 8:23 AM