The QDR-3 from RF Bay is a Frequency Multiplier with Input Frequency 2 to 4 GHz, Output Frequency 4 to 8 GHz, Input Power 10 to 15 dBm, Harmonics 33 to 42 dBc, Conversion Loss 13 dB. Tags: Module with Connectors, Passive. More details for QDR-3 can be seen below.