This is a series of 4 port couplers with 8 standard coupling values between 6 and 30 dB that covers 380-4000MHz The coupler is unterminated standard coupler (no internal termination) that can be used to monitor forward and reverse powers. It can also be used as a two way unequal power combiner of the main line input and the isolated port. When used as a Combiner, the main line path loss is in the range of 0.3 to 1.8dB , depending upon the coupling value. The coupler is capable of handling input powers at all ports up to 200 Watts CW