Furuno ETR-30N User Manual download pdf (Page 35)

3.2 Additions to NavNet Series Operator’s Manual

Depending on the version number of your NavNet series operator’s manual, its echo

sounder descriptions may not match the screens you see. Please add the following

descriptions to your manual if they are not already present.

Choosing pulse repetition rate (PRR)

Pulse repetition rate can be changed to reduce second reflection echoes. Normally, the

highest rate (20) is used. When in shallow waters, second reflection echoes may appear

between surface and actual bottom echo. In this case lower the pulse repetition rate. If the

setting is too small, it may not be possible to search fish schools effectively. Select “20”

unless second reflection echoes appear on the display. The option “S” means the ship’s

speed dependent mode, where the PRR automatically changes with ship’s speed (requires

speed input).

1. Press the [MENU] key to open the menu.

2. Press the SOUNDER MENU soft key.

3. Select PRR LEVEL.

4. Press the EDIT soft key to open the setting window.

5. Use the trackball or cursor pad

to select pulse repetition rate desired.

6. Press the ENTER soft key followed by the [MENU] key to close the menu.

Sounder system setup menu

Menu items for adjustment of STC and frequencies and selection of fishing objective have

been added to the SOUNDER SYSTEM SETUP menu. Press the [MENU] key, choose

SOUNDER SYSTEM SETUP menu and then press the NEXT PAGE soft key.

SYSTEM

SETUP 2

EDIT

PAGE

STC - HF 00

STC - LF 00

FREQ. ADJ. - HF +00.0

FREQ. ADJ. - LF +00.0

TARGET ECHO NORMAL

Page 2 of sounder system setup menu

STC-HF, LF

Adjusts STC level for the high and low frequencies, and is useful for suppressing surface

noise. The setting range is 0-10; the higher the setting the greater the degree of

suppression. Setting 10 suppresses noise up to about several meters from own ship. Turn

off the STC when there is no noise on the screen, otherwise weak echoes may be missed.

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Furuno ETR-30N User Manual Page 35