NorthStar 6000i Installation Manual page 24

SECTION THREE: Setting up the radar (new navigator software)
1. From Page 4 (selected above), press Install... and Tune... .
2. If necessary, press Tune mode repeatedly until it displays Auto .
Setting the STC Curve
The Sensitivity Time Control (STC) attempts to compensate for the high strength of nearby echoes
compared with the very weak echoes from distant objects. It lowers the receiver gain when the pulse
is transmitted, and raises the gain as echoes return from longer distances. Ideally, the result is that all
echoes are displayed with strengths proportional to the object reflectivity. A graph of the receiver
gain versus time is called the STC curve. The user can select different curve shapes, if required for
special applications.
Curve 4 is recommended for all normal applications.
Higher curve numbers might be appropriate for installations where the radar antenna is located high
on the vessel.
Lower curve numbers might be appropriate for installations where the radar antenna is located low
on the vessel.
To select a different curve:
1. From Page 4 (selected above), press Install... and then Tune... .
2. Press STC Curve and use the keypad to enter a curve number from 0 to 8.
Setting the Trigger Delay
There are two methods that can be used to set the Trigger Delay. The two methods should produce
very similar settings. The installer may use either or both methods. Method One is the easier method
to perform; Method Two may produce more accurate results.
The procedure should be performed after the factory settings have been restored as described above,
or by manually turning off the Interference Rejection, Trails and Expand functions.
Method 1:
This method should be used while the vessel is in open water with few or no nearby echoes.
First, we need to set the rain clutter and sea clutter to 0 and the gain to 50.
1. From the main radar screen, press Page 2 .
2. Press the zoom IN key several times to zoom in to the most magnified image.
3. If necessary, press Mode to make it read Manual .
4. Press Rain Cutter to activate the control.
5. Press the " 0 " key on the keypad two times to set the rain clutter value to zero.
6. Press Sea Clutter .
Press the " 0 " key on the keypad three times to set the sea clutter to zero.
7.
8. Press Gain to activate the control.
9. Press " 0 ," " 5 " and " 0 " on the keypad to set the gain to 50.
Page 20 Radar Installation Manual, Rev. E1