Interference Rejector - Furuno FAR-2228-BB Operator's Manual

1. OPERATIONAL OVERVIEW
1.22

Interference Rejector

Mutual radar interference can occur in the vicinity of an-
other shipborne radar operating in the same frequency
band. It is seen on the screen as a number of bright
spikes either in irregular patterns or in the form of usu-
ally curved spoke-like dotted lines extending from the
center to the edge of the picture. Activating the interfer-
ence rejector circuit can reduce this type of interfer-
ence. The interference rejector is a kind of signal
correlation circuit. It compares the received signals over
successive transmissions and reduces randomly occur-
ring signals. There are three levels of interference rejection depending on the number
of transmissions that are correlated.
You can access this feature from the InstantAccess bar
able settings are: [OFF], [1], [2] or [3].
Note: When multiple radars using the same frequency
are nearby, interference may appear in a similar manner
to that shown in the figure to the right. If this kind of inter-
ference appears, do one of the following:
• Press the HL OFF key, or click the [HL OFF] button on
the InstantAccess bar™.
• Change the range.
How to reject interference from the InstantAccess bar
To adjust the interference rejector, select the [IR] button (
™
cess bar
The available settings, in cyclic order, are: [OFF]
Level [3] provides the highest level of rejection.
How to reject interference from the menu
1. Open the menu.
2. Select [1 ECHO].
3. Select [2 CUSTOMIZED ECHO].
Note: You can also right-click the [PICTURE]
box to access this menu.
4. Select [2 INT REJECTOR].
5. Select the required setting.
6. Close the menu.
1-34
, then left-click to cycle through the rejection levels.
™
, or from the menu. The avail-
Interference from radars Interference from radars
using the same frequency. using the same frequency.
TM
IR
) on the InstantAc-
OFF
[1] [2] [3] [OFF]...