The HE397B-2 from Sainty-Tech Communications Limited is a RF Amplifier with Frequency 20 to 3600 MHz, Gain 20 to 22 dB, Gain Flatness ±1.0 dB, Noise Figure 2.5 dB, Output Power 15 to 16.5 dBm. Tags: Power Amplifier. More details for HE397B-2 can be seen below.