Lowrance electronic LRA-1000 - Manual (Page 17)

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The 2 kW models, the LRA-1000 and LRA-1500, will have only one ring
on the display. The 4 kW radars — LRA-2000, LRA-4000 and LRA-5000
— will have two rings on the display. See the following figures.
Before adjusting the Trigger Delay for 4 kW radars, two rings will be
shown on the screen (left). As Trigger Delay is increased, the larger
ring will start to get smaller. The small ring will disappear (right).
You may have to increase gain in the previous step if the rings are not
visible. Increase gain until you have solid red rings shown on the
screen, like in the preceding example. Increasing Gain too much can
cause distortion of the rings.
4. Press
↑ to increase the level of Trigger Delay, which will decrease the
size of the ring. If you have a 4 kW radar, as the large ring decreases in
size, the smaller ring in the center of the screen will disappear, leaving
only one ring.
Increase Trigger Delay to diminish the size of the red ring (left). To set
Trigger Delay correctly, reduce the ring to as small a size as possible,
while keeping a black circle in the middle (enlarged view, right).
In either case, continue to increase the Trigger Delay level until the
ring is as small as possible, while keeping a black circle in the middle.
Every radar is different, but typically, a setting between 35 and 42 per-
cent will get the job done.