SPS 49

AN/SPS-49 on USS Abraham Lincoln (CVN-72)
Country of origin	United States
Introduced	1975

 The AN/SPS-49 is part of the combat systems of the Oliver Hazard Perry class ...

The AN/SPS-49 is a United States Navy two-dimensional, long range air search radar built by Raytheon that can provide contact bearing and range. It is a primary air-search radar for numerous ships in the U.S. fleet and in Spain, Poland, Taiwan aboard Oliver Hazard Perry-class frigates, Canada on its Halifax-class frigates, New Zealand on its Anzac-class frigates and Australia on its Adelaide-class frigates and Anzac-class frigates. It also serves in a complementary role aboard Aegis cruisers with the AN/SPY-1.

First tested in 1965 aboard USS Gyatt (DD-712) and introduced in 1975, the AN/SPS-49 operates in the 851–942 MHz, or L-, band and has a range of 256 nautical miles (474 km). The orange-peel parabolic shape of the antenna creates a narrow 3.3°-beam to reduce the probability of detection or jamming. It can rotate at 6 rpm in long range mode or 12 rpm in short-range mode.^[1] Default is at 12 rpm for the AN/SPS-49A(V)1, to provide more frequent scans against incoming missiles. The SPS-49A(V)1 can detect out to its full range at either 6 or 12 rpm. The antenna is stabilised to compensate for ships pitch and roll, to a maximum of +/-15° for both pitch and roll in 12 rpm mode, and +/-23.5° for both pitch and roll in 6 rpm mode. The output stage of the transmitter in all variants uses a two-cavity klystron amplifier.