The NJS8487UN from Nisshinbo Micro Devices Inc. is a Low Noise Block with RF/Input Frequency 3.625 to 4.2 GHz, Output Frequency 950 MHz to 1.525 GHz, LO Frequency 5.15 GHz, Gain 59 to 66 dB, LO Frequency Stability +/- 1 ppm. More details for NJS8487UN can be seen below.