The QDR-4 from RF Bay is a Frequency Multiplier with Input Frequency 4 to 8 GHz, Output Frequency 8 to 16 GHz, Input Power 10 to 15 dBm, Harmonics 40 to 46 dBc, Conversion Loss 16 dB. Tags: Module with Connectors, Passive. More details for QDR-4 can be seen below.