Furuno FR1500 Mk3 User Manual download pdf (Page 42)

-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

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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