The E6003C-1323 from Yantel Corporation is a Gain Equalizer with Frequency 1.3 to 2.3 GHz, Gain Equalization 3.3 dB, Insertion Loss 0.75 dB, Power 1 W, Impedance 50 Ohms. Tags: Surface Mount, Die, Negative Gain Slope. More details for E6003C-1323 can be seen below.