NorthStar Ethernet Radar Install Manual page 23

At this point, you should see range rings
displayed on the screen. You'll next see the
transmitter warm-up message. "
If no messages or range rings appear, then
the radar control box is not powered or is not
properly interfaced to the navigator. Check
power wiring, interface wiring, and
navigator configuration as described above.
3. Press Adjust radar... to access the setup
functions.
Setting the Trigger Delay
Trigger delay compensates for cable transmission delays which vary depending on cables lengths
and other factors in each particular installation. In general, longer cables require a higher trigger
delay setting. Typical settings are between 125 and 160.
An incorrect setting causes a doughnut-shaped ring in the center of the screen. Trigger delay can be
roughly set by reducing the dark hole in the center until it just disappears.
The vessel should be located 50 to 100 yards from a straight jetty or other landmark that should
produce a straight-line echo on the screen.
1. Adjust the gain to obtain a reasonably good image of the jetty echo.
2. On the Adjust radar... page, press Setup...
3. Press Trigger delay to activate the key.
4. Adjust the Trigger Delay to make the jetty echo appear as a straight line on the screen as
shown in Figure 16.
Jetty
Incorrect
Radar tuning
Tuning makes the radar receiver frequency match the transmitter frequency. After the initial setup,
the radar's tuning is maintained automatically.
Ethernet Radar Installation Manual, Rev. A
Vessel
Incorrect
SECTION THREE: Setting up the radar
Figure 16: Adjusting Trigger Delay
Correct
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