The QFM4-28000-40000 from Qualwave is a Frequency Multiplier with Input Frequency 7 to 10 GHz, Output Frequency 28 to 40 GHz, Input Power 10 dBm, Output Power 13 dBm, Harmonics -20 dB. Tags: Module with Connectors. More details for QFM4-28000-40000 can be seen below.