The Agilent 779D is an economical directional coupler designed for swept measurements in the 1.7 to 12.4 GHz range. Its high directivity and mean coupling accuracy of plus or minus 0.5 dB makes the Agilent 779D ideal for reflectometer applications. The auxiliary arms track very closely, making this coupler particularly useful for reflectometers driven by sweep oscillators such as the Agilent 8350B.