The HE390B from Sainty-Tech Communications Limited is a RF Amplifier with Frequency 30 to 520 MHz, Gain 15 to 16.5 dB, Gain Flatness ±0.5 dB, Noise Figure 2.3 dB, Output Power 28 to 29 dBm. Tags: Power Amplifier. More details for HE390B can be seen below.