Description of the radar set, tactical-technical characteristics
Figure 1: AN/SPS-8
|frequency:||3 430 … 3 570 MHz
|pulse repetition time (PRT):|
|pulse repetition frequency (PRF):||500 or|
|pulsewidth (τ):||1 or 2 µs||2 µs|
|peak power:||650 kW||1 MW|
|instrumented range:||60 NM
(≙ 111 km)
(≙ 133 km)
|hits per scan:|
The AN/SPS-8 and AN/SPS-8A are shipboard integrated S-Band search and height-finding radar systems used for the detection and surveillance of aircraft. The AN/SPS-8 was the main early post-war heightfinder. It presents target height, slant range, bearing, and beacon information. The 5 × 15 ft orange-peel shaped parabolic antenna was precisely stabilized by use of a stable element and the roll and pitch servo loops.
AN/SPS-8 used a special Robinson Scanner that scanned electically the elevation angle. The heightfinders could be directed to look in a set direction, the feed nodding the beam up and down up to twenty times each minute or they could scan in azimuth as well.
The modernized AN/SPS-8A got a higher-gain astigmatic formed (nearly circular) antenna (12 × 15 ft). When the new antenna was combined with a much more powerful transmitter tube, the radar got the new designator AN/SPS-30. AN/SPS-8 and AN/SPS-30 were the standard heightfinders of US carriers through the mid1960s.