The MSPD-001-99 from Massachusetts Bay Technologies is a RF Detector with Frequency 2 to 6 GHz, Capacitance 0.2 to 0.6 pF, Response Time 100 pS (Transition), Operating Temperature -55 to 150 Degree C, Storage Temperature -65 to 200 Degree C. Tags: Phase Detector. More details for MSPD-001-99 can be seen below.