Furuno FR-1710 - Manual (Page 72)

SP - 1
SPECIFICATIONS OF MARINE RADAR
FR-1710/1725/1760DS
1. ANTENNA RADIATORS
(1) Type Slotted waveguide array
(2) Polarization Horizontal
(3) Rotation 24 rpm or 42 rpm (FR-1760DS: 24 rpm only)
(4) Radiator length 4 ft (XN12AF), 6.5 ft (XN20AF), 8 ft (XN24AF)
8.1 ft (SN4A), 9 ft (SN5A)
(5) Horizontal Beamwidth
-3 dB: 1.8° (XN12AF), 1.23° (XN20AF), 0.95° (XN24AF)
2.68° (SN4A), 1.23° (SN5A)
-20 dB: 3.1° (XN12AF), 3.1° (XN20AF), 2.5° (XN24AF)
(6) Vertical Beamwidth 20°
(7) Sidelobe attenuation
XN12AF: -24 dB (within ±10° of main-lobe)
-30 dB (outside ±10° of main-lobe)
XN20AF/XN24AF: -24 dB (within ±20° of main-lobe)
-30 dB (outside ±20° of main-lobe)
SN4A: -23 dB (within ±20° of main-lobe)
-25 dB (outside ±20° of main-lobe)
SN5A: -20 dB (within ±20° of main-lobe)
-25 dB (outside ±20° of main-lobe)
(8) Antenna Gain XN12AF: 27.5 dB, XN20AF: 30.0 dB, XN24AF: 31.5 dB
SN4A: 26.0 dB, SN5A: 26.4 dB
(9) Wind Speed 51.5 m/s relative
2. RF TRANSCEIVER
(1) Frequency FR-1710/1725: 9410 MHz ±30 MHz
FR-1760DS: 3050 MHz ±30 MHz
(2) Output Power FR-1710: 10 kW, FR-1725: 25 kW, FR-1760DS: 60 kW
(3) Spurious Response -40 dB or less
(4) IF Amplifier 60 MHz, Logarithmic
(5) Bandwidth
FR-1710/1725: Short 1/2, Middle 1 pulse: 27 MHz
Middle 2/3, Long pulse: 3 MHz
FR-1760DS: Short pulse: 27 MHz
Middle 1/2, Long pulse: 3 MHz