The BG18D from BeRex, Inc. is a RF Amplifier with Frequency 5 MHz to 4 GHz, Gain 20.8 to 24.3 dB, Noise Figure 4.2 to 4.5 dB, Output Power 17.3 to 19.5 dBm, Output Power 0.05 to 0.09 W. Tags: Surface Mount, Gain Block, Power Amplifier. More details for BG18D can be seen below.