Function Keys, Suppressing Second-Trace Echoes

3.10 Function Keys

The function keys (F1 and F2) work like the auto-dialing feature of a telephone, automati- cally executing the function assigned to them. The assigned function can be turned on/off by pressing appropriate function key again.

Default settings

F1: Display NAV/ARPA data

F2: Noise rejector

How to program function keys

1.Press the [MENU] key.

2.Press [F1] or [F2] to open the function menu.

[ SETTING FOR F1 KNOB ]

SSel by T-ball & press ENT.S Press MENU key to escape.

3.12Suppressing 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 re- turn echo is received one transmission cycle later, namely, after a next radar pulse has been transmitted. To suppress them, select “2nd Rej On” on the OTHER MENU.

3.13 Suppressing Noise

Electrical noise can be suppressed by turning on “7. NOISE REJ” on the OTHER MENU.

This function is available by pressing the [F2] key (default setting).

3.14 Outputting Target Position

RINGS

NOISE

REJECT

TUNE

A/M

WATCH

MAN

OTHER

WPT

MARK

ARP-10

DISP

HIS

TORY

DISP

DATA

PULSE

LENGTH

GUARD

IN/OUT

PANEL

DIMMER

EBL

REF

OWN

POSITN

ALL

CANCEL

COLLI

SION

STBY

DISP

TRAIL

TIME

ALARM

LEVEL

MARK

BRILL

VRM

UNIT

CURSOR

POSITN

VECTOR

LENGTH

AUTO

ACQ

INT

REJECT

TRAIL

TONE

DEAD

SECTOR

CHARA

CTERS

INDEX

LINE

ARP-10

VECTOR

REF

FNCTN

Target position data can be output to a plotter in IEC 1162 format. Press and hold down the [TLL] key to output the data. This function re- quires position data and heading signal.

3.15 Tuning the Receiver

The radar receiver can be tuned automatically or manually, and the default tuning method is automatic. In automatic tuning, the radar is au- tomatically tuned everytime the radar is switched to “Tx” and the indication “TUNING” appears during tuning.

The tuning bar at the top right-hand corner of the display shows tuning condition. Generally, the longer the tuning bar the better the tuning condition, however the length of the bar changes with number of radar echoes, range and other factors. Current tuning method is shown above

Figure 3-10 Function menu

3.Select function desired.

4.Press the [ACQ/ENTER] key.

5.Press the [MENU] key to close the menu.

3.11Adjusting Brilliance of Markers

“2. Mark Brill” on the OTHER MENU adjusts the brilliance of markers such as the cursor.

the tuning bar as either “AUTO” or “MANUAL.”

For how to tune the receiver manually, see "9. Tune" on page 3-7.

Note: Automatic tuning may not work properly if own ship’s radar receives the radar wave of another ship’s radar. If this is the case, the radar will be out of tune. Press the [STBY/TX] key twice to retune.

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