The QBS-258 from Spectrum Control is a RF Amplifier with Frequency 1.92 to 1.99 GHz, Gain 30.5 to 32 dB, Output Power 39.5 to 41 dBm, Output Power 8.91 to 12.59 W, P1dB 39.5 to 41 dBm. Tags: Power Amplifier. More details for QBS-258 can be seen below.