The QBS-610 from Spectrum Control is a RF Amplifier with Frequency 1 to 2 GHz, Gain 18 to 26 dB, Small Signal Gain 40 to 48 dB pk-pk, Gain Flatness ±1.8 dB, Noise Figure 6.5 dB. Tags: Automatic Gain Controlled Amplifier, Limiting Amplifier. More details for QBS-610 can be seen below.