Furuno FR1500 Mk3 User Manual download pdf (Page 47)

-1.35-

1.36 Echo Stretch, Contrast, Enhanced Video

On long ranges target echoes tend to shrink in the bearing direction, making them difficult to see.

On short and medium ranges such as 1.5, 3 and 6 nm scales, the same size targets get smaller on

screen as they approach the own ship. These are due to the inherent property of the radiation

pattern of the antenna. To enhance target video, use the echo stretch function. There are two types:

echo stretch 1 (ES1) to enlarge in bearing direction for long range detection, and echo stretch 2

(ES2) to enlarge in range direction on 1.5-6 nm scales.

1.36.1 Echo stretch

1. Press the [F1] key.

2 Press the [4] key twice to display the ECHO SIG menu.

3. Press the [4] key to select echo stretch function desired. A selected

level appears at the lower left-hand position. Each selection works as

in the figure below.

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

ES OFF

ES1 – Enlarged in bearing

direction

Use on range 1.5-12 nm

ES2 – Enlarged in range

direction. Invalid at P/L S1

and S2

Use on range 1.5-6 nm

Notes:

1) If the 1.5 nm range is preset for pulselength of S1 or S2, and the 3 nm scale for S2, the echo

stretch is not available on those 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 interference

have been sufficiently suppressed before activating this function.

1.36.2 Contrast

Contrast is adjustable in 3 levels according to the radar video sampling level. Press [F1], [6] and

select the level so that the picture shows up most clearly from the background.

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Furuno FR1500 Mk3 User Manual Page 47