The D-9901-1-1K from Narda-MITEQ is a Block Downconverter with Input RF Frequency 3.4 to 4.2 GHz, Output RF Frequency 70 MHz, LO Stability ± 0.25 to 0.5 dB(Level stability), P1dB 16 to 17 dBm, Gain 44 to 48 dB. More details for D-9901-1-1K can be seen below.