The QDA-12000-18000-63.75-0.25 from Qualwave is a RF Variable Attenuator with Frequency 12 to 18 GHz, Attenuation Range 0 to 63.75 dB, Attenuation Accuracy ±2.5 dB, Insertion Loss 3.7 dB. Tags: Digital. More details for QDA-12000-18000-63.75-0.25 can be seen below.