The HE390A from Sainty-Tech Communications Limited is a RF Amplifier with Frequency 20 to 500 MHz, Gain 17 to 18 dB, Gain Flatness ±0.75 dB, Noise Figure 6 dB, Output Power 27 to 27.5 dBm. Tags: Power Amplifier. More details for HE390A can be seen below.