The NJR2836UN from Nisshinbo Micro Devices Inc. is a Low Noise Block with RF/Input Frequency 12.25 to 12.75 GHz, Output Frequency 950 MHz to 1.45 GHz, LO Frequency 11.3 GHz, Gain 55 to 60 dB, LO Frequency Stability +/- 1 ppm. More details for NJR2836UN can be seen below.