Furuno ETR-30N Additions to NavNet Series Operator’s Manual, Choosing pulse repetition rate PRR

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.

STC - HF	00
STC - LF	00
FREQ. ADJ. - HF	+00.0
FREQ. ADJ. - LF	+00.0
TARGET ECHO	NORMAL

SYSTEM SETUP 2

EDIT

PREV

PAGE

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.

17