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SP - 1 E3481S01B
SPECIFICATIONS OF MARINE RADAR
MODEL 1761 MARK-3
1. GENERAL
1.1. Indication System PPI Daylight display, raster scan, 8 tones in monochrome
1.2. Range, Pulselength (PL) & Pulse Repetition Rate (PRR)
Range (nautical miles)
PL PRR 0.125 0.25 0.5 0.75 1.5 2 3 4 6 8 12 16 24 36 48
SP 2100 Hz 0.08 µs
MP 1200 Hz 0.3 µs
LP 600 Hz 0.8 µs
1.3. Range Resolution 41 m
1.4. Bearing Discrimination 2.9º
1.5. Minimum Range 39 m (0.25 NM range)
1.6. Bearing Accuracy Within 1º
1.7. Range Ring Accuracy 0.9 % of range or 8 m, whichever is the greater
2. ANTENNA UNIT
2.1. Radiator Slotted waveguide array
2.2. Polarization Horizontal
2.3. Antenna Rotation Speed 24 rpm or 48 rpm nominal
2.4. Radiator Length 100 cm (XN-10A)
2.5. Horizontal Beamwidth 2.4°
2.6. Vertical Beamwidth 27°
2.7. Sidelobe Attenuation Within ±20° of main-lobe: less than -24 dB
Outside ±20° of main-lobe: less than -30 dB
3. TRANSCEIVER MODULE
3.1. Frequency 9410 MHz ±30MHz (X band)
3.2. Modulation P0N
3.3. Peak Output Power 4 kW nominal
3.4. Modulator FET Switching Method
3.5. Intermediate Frequency 60 MHz
3.6. Tuning Automatic
3.7. Receiver Front End MIC (Microwave IC)
3.8. Bandwidth Tx pulselength 0.08 µs and 0.3 µs: 7 MHz
Tx pulselength 0.8 µs: 3 MHz
3.9. Duplexer Circulator with diode limiter