The E2003G51 from Microwave Circuits is a Gain Equalizer with Frequency 200 MHz to 3.5 GHz, Gain Equalization 10 dB, Insertion Loss 1.5 to 11.5 dB, Power 30 dBm, Impedance 50 Ohms. Tags: Module with Connectors, Positive Gain Slope. More details for E2003G51 can be seen below.