The S21 Series from AMETEK CTS is a RF Amplifier with Frequency 1 to 2 GHz, Gain 44 to 60 dB, Output Power 46.02 to 59.54 dBm, Output Power 39.99 to 899.5 W, P1dB 46.02 to 59.54 dBm. Tags: Benchtop / Rackmount, Power Amplifier. More details for S21 Series can be seen below.