Teleflex TFX320 Operation Manual page 19

USING THE 320 SERIES
CONTROL PANELS
The Contrast setting is retained in memory if it falls between 6 and 10. The
factory setting is 8.
RTS W selects the width of the window
INDOW
dedicated to Real Time Sonar. Selecting a smaller
number decreases the width of the RTS window
leaving more space for the chart window, however
some sonar returns will not be visible. Selecting a larger number makes the RTS
window wider and shows more of the sonar intensity information, however less
space on the LCD is available for sonar history.
Note: When the RTS window is adjusted to a width greater than 4; no
grayscale information is shown.
RTS Window setting is retained in memory when the 320 is turned off. The factory
setting is 2.
S C eliminates most sonar returns
URFACE LUTTER
near the water surface caused by trapped air,
boat wakes and temperature inversions. Most
surface clutter appears on the display because
the strongest sonar return comes from the shallowest objects. The 320 uses a
sophisticated feature called TVG (Time Variable Gain) to overcome surface clutter
and counteract the affect of depth on sonar return strength. The level 1 setting is
optimal for making sonar information from all depths appear the same. However,
many users prefer to see more surface clutter than this setting shows. Selecting a
higher number shows more surface clutter, but sonar returns nearest the surface
will appear more intense than they actually are.
The Surface Clutter setting is retained in memory when the 320 is turned off. The
factory setting is 4.
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