The AT-A69, 250 Watt Attenuator is designed for low-PIM, high power base station amplifier testing in a laboratory or production setting. It has broadband application that covers most popular communication frequencies. The Attenuator is designed with a precision broadband low PIM high power directional coupler with the main line terminated with a high power low PIM cable load. The load is fan cooled to minimize heat rise with optional input AC voltages. An on/off switch for the fan is located on the input side to turn off the fan for low Power operation. 30 dB attenuation is the most common/popular value but 10 or 20 dB are readily available.