The QBS-611 from Spectrum Control is a RF Amplifier with Frequency 1 to 2 GHz, Gain 11 to 19 dB, Small Signal Gain 33 to 41 dB pk-pk, Gain Flatness ±1.8 dB, Noise Figure 7 dB. Tags: Automatic Gain Controlled Amplifier, Limiting Amplifier. More details for QBS-611 can be seen below.