FURUNO
FAR-21x7/28x7 SERIES
SP - 1
E3519S01N-M
SPECIFICATIONS OF MARINE RADAR/ARPA
FAR-21x7/28x7 SERIES
1 ANTENNA
RADIATOR
1.1 Type
Slotted waveguide array
1.2 Beam width and sidelobe attenuation
X-band S-band
Radiator type
XN5A
XN12AF
XN20AF
XN24AF
SN36AF
Length
10 ft
4 ft
6.5 ft
8 ft
12 ft
Beam width(H)
0.75°
1.9°
1.23°
0.95°
1.8°
Beam width(V)
20°
20°
20°
20°
25°
Sidelobe within ±10°
-26 dB
-24 dB
-28 dB
-28 dB
-24 dB
Sidelobe outside ±10° -30 dB
-30 dB
-32 dB
-32 dB
-30 dB
1.3 Polarization
Horizontal
1.4 Rotation
FAR-2117/2127/2817/2827 24
rpm or 42 rpm (option)
FAR-2137S/2837S
21 rpm (50 Hz)/26 rpm (60 Hz)/45 rpm (HSC: high speed craft)
FAR-2827W 24
rpm
FAR-2837SW
21 rpm (50 Hz), 26 rpm (60 Hz)
1.5 Wind tolerance
Relative wind 100 kn
1.6 De-icer (option)
On: When temperature goes down to +5°C
Off: When temperature goes up to +12°C
2 RF
TRANSCEIVER
2.1 Frequency
X-band
9410 MHz ±30 MHz
S-band
3050 MHz ±30 MHz
2.2 Output
power
FAR-2117/2817 12
kW
FAR-2127/2827/2827W 25 kW
FAR-2137S/2837S/2837SW 30
kW
2.3 Range, pulse repetition frequency (PRF), pulselength
Range
PRF
（
Hz
）
0.125 0.25 0.5 0.75 1
1.5
2 3
4 6
8
12
16
24
32 48 72 96
120
3000*
0.07 µs
3000*
0.15 µs
1500
0.3 µs
1000
0.5 µs
1000
0.7 µs
600
(500**)
1.2 µs
1, 2, 4, 8, 16, 32, 120 nm ranges not available on IMO radar.
* 32 nm w/TT: 2200 Hz, **: for 96/120 nm
2.4 Duplexer
FAR-2117/2127/2137S/2817/2827/2827W/2837S
Ferrite circulator with diode limiter
