The B3240Q from Narda-ATM is a DC Block with Frequency 10 MHz to 50 GHz, Insertion Loss 1.5dB, Breakdown Voltage 75 volts, VSWR 1.75:1, Operating Temperature -65 to 125 Degree C. Tags: Connectorized, Inner-Outer DC Block. More details for B3240Q can be seen below.