The NJR2937EN from Nisshinbo Micro Devices Inc. is a Low Noise Block with RF/Input Frequency 10.95 to 11.70GHz, Output Frequency 950 MHz to 1.7 GHz, LO Frequency 10 GHz, Gain 55 to 60 dB, External Reference 10 MHz. More details for NJR2937EN can be seen below.