Argus Radar - RADAR CONFIGURATION
988-10187-004 3.18
3.9.3 Trigger Delay
Press the C button (password protected) of fig. 3.9.1, page 3.16 to adjust the Trigger
Delay. The Trigger delay is caused by the path length mismatch for the trigger and video
signal.
The video path delay is much longer because it's the result of the transmission through the
waveguide to the antenna and back.
The delay depends of the length and type of the cable/waveguide used in the installation.
The range scale is automatically set to 0.25 NM. Press the arrow buttons in order to
enlarge or squeeze the picture and adjust the delay between video and trigger from 0
meters to a maximum of 384 meters.
The delay adjustment is visible in real time on the PPI around the ship.
The illustration shows two different samples of incorrectly adjusted trigger delay:
• 1: The dock or pier is bowed towards the center, which means that the figure is too
high
• 2: The dock or pier is bowed away from the center, which means that the figure is
too low.
NOTE
For SRT transceivers it is also possible to change the delay to negative
numbers. In this case the trigger from the TXRX will be anticipated in time
in respect to the video. This negative setting is needed when trigger and
video are passing through long coaxial cables with different propagation
times, the video cable being the slowest one.
This usually happens for all installations with an SRT Adapter Box, as
buffer amplifier and cable lengths are more than 150 meters.
NOTE
On channel 1 and 2, two optional buttons C for Trigger and Video polarity
will be available.
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