The HEM393B from Sainty-Tech Communications Limited is a RF Amplifier with Frequency 10 to 500 MHz, Gain 17 to 18 dB, Gain Flatness ±0.5 dB, Noise Figure 4 dB, Output Power 16.5 to 17 dBm. Tags: Power Amplifier. More details for HEM393B can be seen below.