The TSX-DFM-BF from PolyPhaser is a RF Surge Protector with Frequency 698 MHz to 2.7 GHz, Input Power 500 W, Insertion Loss 0.1 dB, Operating Temperature -50 to 85 Degree C, Surge Current 40 kA. Tags: Filter. More details for TSX-DFM-BF can be seen below.