The HEM583 from Sainty-Tech Communications Limited is a RF Amplifier with Frequency 800 to 2500 MHz, Gain 23 to 24 dB, Gain Flatness ±0.75 dB, Noise Figure 5 dB, Output Power 19 to 20 dBm. Tags: Power Amplifier. More details for HEM583 can be seen below.