The NJS8488U from Nisshinbo Micro Devices Inc. is a Low Noise Block with RF/Input Frequency 4.5 to 4.8 GHz, Output Frequency 960 MHz to 1.26 GHz, LO Frequency 5.76 GHz, Gain 59 to 66 dB, LO Frequency Stability +/- 1 ppm. More details for NJS8488U can be seen below.