The HJM-81 SQ from Crane Aerospace & Electronics is a 90 Degree Hybrid Coupler with Frequency 21.25 to 141.25 MHz, Average Power 1 W, Insertion Loss 0.8 dB, Isolation 25 dB, Coupling -3 dB. Tags: Module with Connectors. More details for HJM-81 SQ can be seen below.