The QWSP77 from Qualwave is a RF Surge Protector with Frequency 0.8 to 2.7 GHz, Input Power 2500 W, Insertion Loss 0.2 to 0.3 dB, Operating Temperature -40 to 85 Degree C, Surge Current 30 kA. Tags: Quarter-Wave Shorting Stub (QWS). More details for QWSP77 can be seen below.