The AN/FPS-8 was a medium-range search radar operating on the L-band at a frequency of 1280 to 1380 MHz. Developed in the 1950s by General Electric, over 200 units of this radar were produced between 1954 and 1958. Variants of this radar included the AN/GPS-3 and the AN/MPS-11 and AN/FPS-88.

Technical Specs: (Radio Research catalog)
L BAND SEARCH. Radar type: AN/FPS-8. Freq: 1280-1350 MHz. Pwr. output: 1 MW. Indicator: 12 in PPI, 5 in A scope. Magnetron type: QK-358 Rep. rate: 3 us, 360 pps. Antenna: 25' parabolic section. Pwr. input: 120/208V, 3 ph, 60 Hz. Mfr: GE.

The AN/FPS-88 variant, above, that was used in Portugal -- at site ER-2, Paços de Ferreira Radar Station (Site Nş 2).