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3. Press the [3] key to select ECHO STRETCH.
4. Press the [3] key until Echo Stretch option 1, 2, 3 or OFF as desired is highlighted.
5. Press the [ENTER] key to conclude your selection followed by the [RADAR MENU] key
to close the FUNCTIONS menu. Selected setting is indicated on the left side of the
radar display.
(a) ES1-Enlarged
in bearing direction
(c) ES3-Enlarged
in both range and
bearing directions
(b) ES2-Enlarged
in range direction
Figure 1-27 Echo stretch
Notes on use of echo stretch
1) If the 1.5 SM range is preset with a pulsewidth of S1 or S2, and the 3 SM scale with
S2, the echo stretch is not available on these range scales.
2) The echo stretch magnifies not only small target pips but also returns (clutter) from sea
surface, rain and radar interference. For this reason make sure these types of interfer-
ence have been sufficiently suppressed before activating this function.
1.24 Echo Averaging
The echo average feature effectively suppresses sea clutter. Echoes received from stable
targets such as ships appear on the screen at almost the same position every rotation of
the antenna. On the other hand, unstable echoes such as sea clutter appear at random
positions.
To distinguish real target echoes from sea clutter, this radar performs scan-to-scan corre-
lation. Correlation is made by storing and averaging echo signals over successive picture
frames. If an echo is solid and stable, it is presented in its normal intensity. Sea clutter is
averaged over successive scans resulting in the reduced brilliance, making it easier to
discriminate real targets from sea clutter.
To properly use the echo average function, it is recommended to first suppress sea clutter
with the [A/C SEA] control and then do the following:
1. Press the [RADAR MENU] key and the [0] key to show the FUNCTIONS 2 menu.