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-1.30-
1.31 Suppressing Second-trace Echoes
In certain situations, echoes from very distant targets may appear as false echoes (second-trace
echoes) on the screen. This occurs when the return echo is received one transmission cycle later,
that is, after a next radar pulse has been transmitted.
To activate or deactivate the second-trace echo rejector:
1. Press the [MENU] key followed by the [5] key twice to display the ECHO SIG menu.
ECHO SIG
1. COLOR YEL GRN *
2. CLTR SWEEP OFF ON (LINK) ON(FIX)
3. SWEEP LEVEL 1 2 3
4. ENHANCE OFF ON
5. 2
ND
ECHO OFF ON
6. PULSE 1
7. PULSE 2
8. A/D CURVE A B C D
9. CNTR ENHANCE OFF ON
0. REALTIME HU OFF ON
* COLOR additional to R-type
(8. R-type only)
(9. R-type only)
(0. R-type only)
2. Press the [5] key to select OFF or ON.
3. Press the [ENTER/SELECT] key to conclude your selection followed by the [MENU] key to
close the menu.
1.32 [F1] Key
The [F1] key allows instant access to the primary function controls.
1. Press the [F1] key. The following menu appears.
1. VECTOR T/R
2. PULSE
3. INT REJ
4. STRETCH
5. ECHO AVG
6. CONTRAST
7. N REJ
8. DISP SEL
9. PM
0. SART
Vector mode: True or Relative. Press [F1], [1].
Pulselength selection
Interference rejector; Ref. 1.17.
Echo stretch; Ref. 1.36.
Echo average; Ref. 1.24.
Contrast of video; Ref. 1.36.
Noise rejector; Ref. 1.38.
[ENTER/SELECT] toggles display between Main and Sub.
Activates Performance Monitor. Refer to Chapter 7.
Optimum setting for detecting SART; Refer to 3.3.
2. Press appropriate numeric key. For example, press the [4] key to select desired echo
stretch level. Each press of the [4] key selects echo stretch level.
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