C.A.R.D. 60 Installation And Operation Manual - page 4
The antenna portion of the unit has four directional receivers
that correspond to the four relative display lights on the
control unit. A ship operating radar in a frequency from 3 to
10 centimeters emits a stream of mcrowave pulses as their ant-
enna rotates. When these pulses strike one or more of the
detectors in the C.A.R.D. antenna, they are processed to light up
the corresponding display. The intensity of the signal will
determine the number of lights that will be illuminated.
When the top light bar (zero degrees relative bearing lights ), it
tells you that a target is off your bow, when the light bar at three
O’clock (ninety degrees relative bearing lights ), it tells you that
a target is on your starboard beam. If both top and three O’clock
light bars go on simultaneously and the same number of lights
within the bar are illuminated, they tell you that your target is
approximately 45 degrees off your starboard bow, and so on
around the display .
The C.A.R.D. Radar Detector cannot determine the distance a
scanning ship is away from your vessel, but since radar pulses
are microwaves that travel in straight lines, the maximum range
is a factor of the height of the ship’s radar and your vessel’s
antenna. Remember that more than one ship can be scanning your
vessel at the same time. Experience with your C.A.R.D. System
will quickly enable you to recognize the characteristics of
different situations.
Your Radar Detector can be safely operated at the same time
your own radar is scanning, provided the the detector’s antenna is
installed correctly. The C.A.R.D. antennamay NOT be installed
next to your radar antenna or at the same height. It is best to find
a location as distant as possible from any transmitting antennas .
It is possible that pulses from your own radar could activate the
Radar Detector by reflecting off nearby obstacles on your vessel
as well as other ships or nearby coast lines.
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