Chapter 8: Installation 8-19
Radar System Checks
and Adjustments
Display Timing Adjustment
The displaytiming canbe affected by the lengthof the cable used to connect
thescanner to the displayunit.This in turn affects the short range accuracy
shownon thedisplay.If youhave extended(or reduced)your inter-unit cable,
you will need to check the display timing before using the systemfor
navigation.
Incorrect timing is most noticeable on the
1
/
8
nm or ¼ nm range scales. Targets
suchas bridges or piers appear bent or bowed.
Note:Undernormalcircumstancesyoudonotneedtoadjustthesesettings,as
they are set automatically at the factory. If these parameters are set incor-
rectlythe performance of the radar will be adversely affected.Access to this
menu is therefore via a hidden key press.
➤ To adjustfor correct timing:
1. Select the
1
/
8
nm range.
2. On the radarlocate a straightdock,seawall or bridge that is facing your
ship.Iftheimageisbentorbowed,asshowninthefollowingdiagram,then
you need to adjust the timing.
Figure 8-10: Radar Display Timing
3. Press the MENU key to display the set up softkeys.
4. Press and hold the blank soft key directly to the right of the RADAR SET UP
softkey for 5 seconds. The AdvancedSet Up menu is then displayed.
5. Use the trackpadto move the selection bar down to the Display Timing
option.
6. Use the softkeys to adjust the Display Timing slider. As soon as you start
the adjustment, the menu page is clearedso that you can see the effects of
the adjustment on the radar picture,and the radar is set to
1
/
8
nm range.
7. When the displayed image appears straight,press ENTER to return to the
AdvancedSet Up soft keys.
8. PressCLEAR toreturntothesetup soft keys,andCLEAR againtoreturnto
the normalradar screen.
Alternatively, you canuse a VRM in conjunction with a targetat a known
distanceand adjust the picture so the targetco-incides with the VRM.
Own ship
Own ship
Timing early
Timing late
Normal
D4009-2
Own ship
81186_3.book Page 19 Thursday, August 22, 2002 8:23 AM
To Next Page
Loading...
