MICROLAB's coaxial attenuators for wireless applications cover DC to 3 GHz frequency range. The AS is rated at a full 100 W and the AU at 200 W average rating. The attenuators are constructed of resistive elements in a conventional series circuit. They are bidirectional at low powers, but the male is the input for high powers. *Units are exceptionally rugged, and negligibly affected by normal ambient temperature and humidity changes.