The FDR-2-4 from RF Bay is a Frequency Multiplier with Input Frequency 850 MHz to 2 GHz, Output Frequency 1.7 to 4 GHz, Input Power 10 to 20 dBm, Harmonics 40 to 52 dBc, Conversion Loss 15 dB. Tags: Module with Connectors, Passive. More details for FDR-2-4 can be seen below.