The BLKD-183-S+ from Mini Circuits is a DC Block with Frequency 0.01 to 18 GHz, Insertion Loss 0.43 to 0.8 dB, Breakdown Voltage 200 V, Return Loss 16.5 to 25.42 dB, Operating Temperature -65 to 125 Degree C. Tags: Connectorized, Inner-Outer DC Block. More details for BLKD-183-S+ can be seen below.