Furuno FR-1710 manual Specifications of Marine Radar

	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

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