How To Show Sart Marks On The Radar Display; General Remarks On Receiving Sarts - Furuno FAR-2228-BB Operator's Manual

2. RADAR OBSERVATION
2.3.2

How to show SART marks on the radar display

This radar is equipped with a feature that optimally sets up the radar for SART detec-
tion. This feature automatically detunes the radar receiver out of its best tuning condi-
tion. This erases or weakens all normal radar echoes, but the SART marks are not
erased because the SART response signal scans over all frequencies in the 9 GHz
band. When the radar approaches the SART in operation, the SART marks will en-
large to large arcs, blurring a large part of the screen.
1. Open the menu.
2. Select [1 ECHO].
3. Select [7 SART].
4. Select [ON] to show SART marks on the radar display, or select [OFF] to hide
SART marks.
When the SART function is active, the settings listed in the following table are au-
tomatically made to radar functions:
Range
Pulselength
Echo Stretch
Noise Rejector
Echo Averaging
Interference Rejector
Performance Monitor
A/C RAIN
For X-band solid state radars, the pulselength is fixed as follows while SART is
active.
Range (NM) 0.125
Pulselength
5. Close the menu.
The indication "SART" appears at the top of the screen, in yellow text, when this fea-
ture is active. Be sure to turn this feature off when SART detection is no longer your
objective.
Note 1: For magnetron radars, any changes made to the range while SART is active
will deactivate SART.
Note 2: X-band solid state radars allow the range to be changed while keeping SART
active. SART must be turned off manually for X-band solid state radars. SART detec-
tion is not available for S-band solid state radars.
2.3.3

General remarks on receiving SARTs

SART range errors
When responses from only the 12 low frequency sweeps are visible (when the SART
is at a range greater than about 1 nm), the position at which the first dot is displayed
can be as much as 0.64 nm beyond the true position of the SART. When the range
closes so that the fast sweep responses are seen also, the first of these will be no
more than 150 meters beyond the true position.
2-6
Setting
Magnetron radars
0.25 0.5
S1
Changed to...
12 NM
Long Dependent on range. See table below.
Off
Off
Off
Off
Off
Off
0.75 1 1.5
S2 M1 M2
Solid state radars
24 NM or lower
2 3 4 6 8 12
L
16 24