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AN/SPN-4

Description of the radar set, tactical-technical characteristics

Figure 1: AN/SPN-4

Figure 1: AN/SPN-4

Specifications
frequency: 3 010 … 3 100 MHz
(S-Band)
pulse repetition time (PRT):
pulse repetition frequency (PRF): 1 000 Hz
pulsewidth (τ): 0.4 µs
receive time:
dead time:
peak power: 15 kW
average power: 6 W
instrumented range: 50 NM (≙ 90 km)
range resolution: 90 m
accuracy:
beamwidth: 3.5°
hits per scan:
antenna rotation: 7 rpm
MTBCF:
MTTR:

AN/SPN-4

AN/SPN-4 is operating in the S-Band navigational radar designed for non-combatant ships.

The antenna is a cut paraboloidal reflector 7 feet wide and 1 foot high, fed with a horn radiator. It uses horizontal polarization. The vertical beam width is 13.5 degrees. The antenna mounts on a rotating pedestal which houses the drive mechanism. RF energy may be fed to or from the antenna by means of a coaxial cable or a waveguide. When the distance from the transmitter/receiver to the antenna is less than 20 feet, a 50-ohm coaxial cable may be used.

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