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SPECIFICATIONS OF MARINE RADAR
MODEL 851 MARK-2
1. GENERAL
(1) Indication System PPI Daylight display, raster scan, 4 tones in monochrome
(2) Range, Pulse Length (PL) & Pulse Repetition Rate (PRR)
Range (nm) Pulse Length (µs) PRR (Hz
approx.)
0.125 to 1.5 0.08 2100
1.5 to 3 0.3 1200
3 to 48 0.8 800
(3) Range Resolution 32 m
(4) Bearing Resolution 2.7º
(5) Minimum Range 27 m
(6) Bearing Accuracy Within ±1º
(7) Range Ring Accuracy 1 % of range or 8 m, whichever is the greater
2. SCANNER UNIT
(1) Radiator Slotted wave-guide array
(2) Polarization Horizontal
(3) Antenna Rotation Speed 24 rpm nominal
(4) Radiator Length 100 cm
(5) Horizontal Beamwidth 2.4° nominal
(6) Vertical Beamwidth 25° nominal
(7) Sidelobe Attenuation less than -24 dB, -30 dB outside of main-lobe
(8) Bearing Wind 51.5 m/s (100 knots) relative
3. TRANSCEIVER MODULE
(1) Frequency and Modulation 9410 MHz ±30MHz (X band), P0N
(2) Peak Output Power 4 kW nominal
(3) Modulator FET Switching Method
(4) Intermediate Frequency 60 MHz
(5) Tuning Automatic
(6) Magnetron MG5248 or E3571/E3571A
(7) Receiver Front End MIC (Microwave IC)
(8) Bandwidth 10 MHz
(9) Duplexer Circulator with diode limiter
(10) Time of Heat-up 90 seconds approx.