The D-10001-1-1K 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 dBm, Gain 43 to 50 dB. More details for D-10001-1-1K can be seen below.