Sonar And Profiler Configuration (Sonar And Profile) - Wesmar HD825 Series Operation And Installation Manual

Sonar and Profiler Configuration
(SONAR and PROFILE)
PULSE
At the beginning of each Transmit/Receive cycle
the transmitter turns on and off in a brief period
of time called the Pulse Length, and is measured
in milliseconds (1/1000th of a second). Pulse
Length is equal to 1.5m/ms. The Pulse Width can
be manually adjusted depending on the acoustic
environment and target characteristics. For
example, a shorter pulse will give better target
definition and reduce volume reverberation when
looking for dispersed or small targets in the water
column.
A long pulse may be used when seeking out large
targets at long ranges. Pulse length can be selected
from BOOST (longest) to 3% (shortest). NOTE:
A Zero pulse length will turn the transmitter
OFF, which is useful for eliminating sources of
interference.
The WESMAR sonar displays targets on a VGA
monitor with a resolution of 640 (horizontal) x
480 (vertical) pixels. The vessel location is in the
center of the screen giving a monitor resolution
of 240 pixels, which defines the sonar's range
resolution. For example, at a 100m range, the
monitor resolution of 240 pixels represents 42cm
per pixel.
To see fish closer to the bottom and to mark
shallow depressions you can shorten your pulse
length to increase range resolution, but be aware
of the limitations of monitor resolution.
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WESMAR