The M-51-111-91KWN from Narda-MITEQ is a 90 Degree Hybrid Coupler with Frequency 50 to 110 MHz, Average Power 1000 W, Insertion Loss 0.4 dB, Isolation 16 dB, Amplitude Balance ± 0.7 dB. Tags: Module with Connectors. More details for M-51-111-91KWN can be seen below.