The SXBLOCK-DFM-A from PolyPhaser is a RF Surge Protector with Frequency 800 MHz to 2.3 GHz, Input Power 500 W, Insertion Loss 0.1 dB, Operating Temperature -50 to 85 Degree C, Storage Temperature -50 to 85 Degree C. Tags: Filter. More details for SXBLOCK-DFM-A can be seen below.