The HE383B-4 from Sainty-Tech Communications Limited is a RF Amplifier with Frequency 100 to 600 MHz, Gain 11 to 12 dB, Gain Flatness ±0.5 dB, Noise Figure 1.7 dB, Output Power 27 dBm. Tags: Power Amplifier. More details for HE383B-4 can be seen below.