The QDA-18000-40000-50-0.05 from Qualwave is a RF Variable Attenuator with Frequency 18 to 40 GHz, Attenuation Range 0 to 50 dB, Attenuation Accuracy ±2 dB, Insertion Loss 9 dB. Tags: Digital. More details for QDA-18000-40000-50-0.05 can be seen below.