Wiper; How To Reduce Second-Trace Echoes - Furuno 1835 Operator's Manual

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Wiper

The wiper feature automatically reduces the brilliance of unwanted weak signals
(noise, sea clutter, rain clutter, etc.) and unnecessary signals, like radar interference,
to clear the picture of unnecessary echoes. The result of wiper depends on the wiper
setting used and whether echo averaging is turned on or off, as described below.
Echo Average Off
Echo Average On (1, 2, Auto)
Processing content A: The brilliance of unnecessary weak echoes, like noise and
radar interference, is reduced to clear the picture. The difference between wiper 1 and
2 is that brilliance is lowered more slowly in 1.
Processing content B: Echo averaging is automatically turned on from off when the
wiper feature is turned on. You can see how the picture changes with the echo aver-
aging turned off and turned on.
To activate the wiper feature, do the following:
1. Press the MENU key to open the menu.
2. Use the Cursorpad (
3. Use the Cursorpad (
4. Use the Cursorpad (
5. Press the MENU key to close the menu.
Note: When the [Display Mode] is [True View], this function is not available (see sec-
tion 1.7.2).
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How to Reduce Second-trace Echoes

Echoes from very distant targets can appear as false echoes (second-trace echoes)
on the screen. The second-trace echo occurs when the return echo is received one
transmission cycle later, or after a next transmission of radar pulse.
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Echo averaging and wiper states and wiper effect
or ) to select [Echo] and press the ENTER key.
or ) to select [Wiper] and press the ENTER key.
Wiper options
or ) to select [1] or [2] then press the ENTER key.
TX repetition
Actual range
Second-trace echoes
1. DESCRIPTION OF OPERATION
Wiper 1
Processing content A
Processing content A
Second-trace
echo
False echo
range
Wiper 2
Processing content B
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