Suppressing Radar Interference | Furuno 1942 MARK-2 specs

Fixed time trail

1.When the elapsed time clock counts up to the trail time selected, the elapsed time display freezes.

2.The oldest portions of trails are erased so only the latest trail, equal in length to the trail time selected, is shown.

3.Trail continues.

For example, the one minute trail time is se- lected. When the elapsed time clock counts up to 60 seconds, the elapsed time display freezes at “60,” but the latest one minute of trail are erased and then trail continuous.

3.5Suppressing Radar Interference

Radar interference may occur when near an- other shipborne radar operating in the same frequency band as your radar. Its on-screen appearance is many bright dots either scat- tered at random or in the form of dotted lines extending from the center to the edge of the display. Figure 3-5 illustrates interference in the form of curved spokes. Interference ef- fects are distinguishable from normal echoes because they do not appear in the same place on successive rotations of the scanner.

Continuous trail

The maximum continuous trail time is 99 min- utes and 59 seconds. When the elapsed time clock counts up to that time the elapsed time display is reset to zero and trail begins again.

Cancelling echo trail

Select “OFF (deactivate)” at “ECHO TRAIL” on the menu.

Changing trail attributes

Trail gradation and trail time can be selected on the OTHERS menu.

Table 3-1 Trail attributes

Item in

Description

OTHERS menu

Trails can be shown in single

or multiple gradations. Multiple

paints trails getting thinner

with time just like the

Trail

afterglow on an analog PPI

radar.

Tone

Single

Multiple

Trail time can be set for 15

Trail Time

sec., 30 sec., 1 min., 3 min., 6

min., 15 min., 30 min., or

continuous.

Figure 3-5 Radar interference

Four levels of interference are available, in- cluding off; IR1, IR2, IR3 and OFF. IR3 pro- vides the highest level of rejection.

1.Press the [MENU] key.

2.Select “OTHERS MENU” and press the [ACQ/ENTER] key.

[ OTHERS ]

Select item by omnipad and press ENTER key.

1	. Panel Dimmer			1				2				3		4
2	. Mark Brill			1				2				3
2	. Mark Brill			1				2				3		4
3	. HD Mark			1				2				3
3	. HD Mark			1				2				3		4
4	. Characters			1				2				3
4	. Characters			1				2				3		4
5	. Trail Tone								Multi
5	. Trail Tone				Single				Multi
6	. Int Reject				Off							2		3
6	. Int Reject				Off			1				2		3
7	. Pulselength				Short
7	. Pulselength				Short				Long
8	. Noise Reject								On
8	. Noise Reject				Off				On
9	. Trail Time								30S			1M
9	. Trail Time				15S				30S			1M
		3M				6M			15M			30M		Cont
10.		Tune							Manu
10.		Tune			Auto				Manu
11.		Disp Data							Nav			ARP		All
11.		Disp Data			Off				Nav			ARP		All
12. WPT Mark									On
12. WPT Mark					Off				On
13.		EBL Ref							True
13.		EBL Ref			Rel				True
14. VRM Unit					nm				km			sm
15. Watchman									5M			10M		20M
15. Watchman					Off				5M			10M		20M
16. STBY Disp									Econo				Nav
16. STBY Disp					Norm				Econo				Nav
17.		Guard Mode			In				Out
18.		Own Position							TD
18.		Own Position			L/L				TD
19.		Cursor Posi							L/L
19.		Cursor Posi			R/B				L/L
20.		Alm Sense LV							Mid			Hig
20.		Alm Sense LV			Low				Mid			Hig
21.		Dead Sector							On
21.		Dead Sector			Off				On
22.		Range										1
22.		Range				1/8	1/4		1/2	3/4		1	1.5			48*	64*
		2		4				8			16
		2	3	4			6	8		12	16		14		16

23.Self Test

24.Installation Setup

*Max range 1932M2: 48

1942M2: 64

Figure 3-6 OTHERS menu

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