Selecting Trail Gradation; Echo Stretch - Furuno FR-7041R-MARK-2 Operator's Manual

1.25.4

Selecting trail gradation

The echo trails can be shown in single or multiple gradations. Multiple gradation
paints the trails getting thinner with time, like the afterglow on an analog PPI
radar.
1. Press the [MENU] key to show the main menu.
2. Select OTHER MENU and press the [ENTER] key.
3. Select "5.Trail Tone" followed by desired trail tone; Single or Multi.
4. Press the [ENTER] key.
5. Press the [MENU] key to close the menu.
1.26

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 to make them easier to see. Two types of echo stretch are available: ES1
which stretches echoes in bearing direction, and ES2 which stretches them in
range and bearing directions.
Press the [A/C SEA] (ES PUSH) control to select desired echo stretch. Each
press changes the echo stretch function in the sequence of ES1, ES2 and OFF.
ES1 or ES2 appears at the top right-hand corner of the display when echo stretch
is on.
Note: 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 turning on the echo stretch.
(Multitone)
Figure 1-24 Monotone and multitone echo trails
Bearing
direction
Echo stretch 1
Figure 1-25 Echo stretch
(Monotone)
Bearing
direction
Range
direction
Echo stretch 2
1. OPERATION
1-27