Jeppesen Marine Workboat Navigator 1.3 - Manual (Page 124)

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Jeppesen Workboat Navigator User’s Guide Jeppesen Workboat Navigator User’s Guide
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Jeppesen Workboat Navigator User’s Guide
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Jeppesen Workboat Navigator User’s Guide Jeppesen Workboat Navigator User’s Guide
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Radar
Rejecting Radar Interference
Interference Rejection (IR) is a setting that reduces the interference caused by
radar signals from other radar units operating in the same frequency band as your
radar. The higher you set IR, the less interference you will receive.
In order to not miss weak targets, make sure to turn interference rejection off when
no interference exists
Radar Properties
Initial Radar Setup
Figure 12.4 - Radar Initial Setup
Setting the Transmit Trigger Delay
After successfully installing the radar, transmit trigger delay should be reviewed
and adjusted in order to compensate for cable transmission delays. Longer cables
generally require a higher trigger delay setting.
To adjust the Transmit Trigger Delay setting:
Open Jeppesen Workboat Navigator to a Radar window pane
Select Properties | Initial Setup from the Radar Context menu.
Use the Transmit Trigger Delay up and down arrows or slider bar to achieve a
stable trigger delay setting
Initial radar image rotation and trigger delay settings should be: Transmit Trigger
Delay=0; Radar Heading Line Rotation=90
The transmit trigger delay (TxTrig) is a setting that, when configured incorrectly, can
cause a donut-shaped ring to appear in the center of the radar image. Trigger delay
should be initially set to reduce the size of the ring. Refinement of the Transmit
Trigger is best viewed using radar overlay on the Chart window pane.
Figure 12.5 - Transmit Trigger Delay Settings - Appearance Change
Transmit Trigger Delay can also affect the radar image of a straight object such
as a breakwater or riverfront. These can appear deformed due to excessive or
inadequate trigger delay. Properly setting the delay may require on-the-water tuning
when looking at a straight object. Trigger delay adjustment removes deformations in
the radar return as shown in Figure 12.5.
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