The QDR-2 from RF Bay is a Frequency Multiplier with Input Frequency 1.25 to 3 GHz, Output Frequency 2.5 to 6 GHz, Input Power 10 to 20 dBm, Harmonics 40 to 45 dBc, Conversion Loss 15 dB. Tags: Module with Connectors, Passive. More details for QDR-2 can be seen below.