Echo Stretch - Furuno NAVNET 1734C Operator's Manual

2.19 Echo Stretch

Normally, the reflected echoes from long range targets appear on the display as weaker
and smaller blips even though they are compensated by the radar's internal circuitry. The
echo stretch function magnifies these small blips in all ranges. Two types of echo stretch
are available: ES LOW which stretches echoes in bearing direction and ES HIGH which
stretches them in both range and bearing directions.
Echo Stretch OFF
This function magnifies not only targets but also sea clutter and radar interference. For this
reason, be sure sea clutter and radar interference are properly suppressed before activating
the echo stretch.
1. If not displayed, press the HIDE/SHOW key to show the radar soft keys.
2. Press the SIGNAL PROC. soft key.
3. Press the E. STR soft key to select HIGH, LOW or OFF as appropriate.
4. Press the RETURN soft key to finish.
The display shows ES H (High) or ES L (Low) when the echo stretch is on.
Target
Bearing
direction
"LOW" Echo stretch
Types of echo stretch
2. RADAR OPERATION
Range
direction
Bearing
direction
"HIGH" Echo stretch
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