Description of the radar set, tactical-technical characteristics
Figure 1: WSR-74S
Enterprise Electronics Corporation (EEC®)
|frequency:||2 890 MHz
|5 625 MHz
|pulse repetition time (PRT):|
|pulse repetition frequency (PRF):||160 or 640 Hz||250 … 1500 Hz|
|pulsewidth (τ):||4 or 1 µs||3 µs|
|peak power:||500 kW||240 kW|
|instrumented range:||460 km|
|hits per scan:|
|antenna rotation:||6 rpm||12.5 rpm|
The WSR-74 (abbreviation of Weather Surveillance Radar, Model 74) was developed in 1974 to replace and supplement the U.S. National Weather Service weather radar network operating on WSR-57. There were versions for two different frequency ranges. They were gradually replaced by the WSR-88D Doppler radar starting in 1988.
The WSR-74S operated in the S-band with a magnetron as the transmitter. It used an 12-foot-diameter parabolic antenna fed by a horn radiator. Only 5 of these versions were produced to replace the losses of some WSR-57s in the network.
The WSR-74C operated in C-Band with a klystron as the transmitter and used a 12-foot-diameter parabolic antenna. The radar was used as a local weather radar for thunderstorm warnings and replaced the obsolete AN/FPS-77.
Initially, a complete volume scan took about 5 minutes. From April 2000, with the modernization of the program “WSR-74C/IRIS”, a new scan strategy was used with only 2.5 minutes duration and 12 different elevation angles between 0.5° and 25.9°.
68 of these types of radars were built. The last WSR-74C was decommissioned on December 31, 2012.