Product Type	Operating Frequency Band	VSVR	Coupling accuracy	Average Power	Impedance	Connector
QOH-XX-350/470-NF	350-470MHz	≤1.25:1	5/6/7/10/15/20/30/40	200W	50Ω	N-Female
QOH-XX-350/960-NF	350-960MHz	≤1.25:1	5/6/7/10/15/20/25/30	200W	50Ω	N-Female
QOH-XX-350/1850-NF	350-1850MHz	≤1.30:1	6/10/15/20/30	200W	50Ω	N-Female
QOH-XX-350/2700-NF	350-2700MHz	≤1.30:1	6/10/15/20/30	200W	50Ω	N-Female
QOH-XX-698/2700-DF	698-2700MHz	≤1.30:1	5/6/7/10/15/20/25/30	500W	50Ω	DIN-Female
QOH-XX-698/2700-NF	698-2700MHz	≤1.25:1	5/6/7/10/15/20/25/30	200W	50Ω	N-Female
QOH-XX-698/2700-SMAF	698-2700MHz	≤1.25:1	5/6/7/10/15/20/25/30	200W	50Ω	SMA-Female
QOH-XX-698/3800-SMAF	698-3800MHz	≤1.25:1	5/6/7/10/15/20/25/30	200W	50Ω	SMA-Female
QOH-XX-700/2700-NF	700-2700MHz	≤1.20:1	50/60/70/80	200W	50Ω	N-Female
QOH-XX-700/3700-04NF	700-3700MHz	≤1.30:1	5/6/7/8/10/12/13/15/20	200W	50Ω	N-Female
QOH-XX-700/3700-04NF	700-3700MHz	≤1.30:1	25/30/35/40	200W	50Ω	N-Female
QOH-XX-2400/5850-01NF	2400-5850MHz	≤1.30:1	6/10/15/20	100W	50Ω	N-Female

A directional coupler is a measurement device that is inserted into the transmission line between an RF source—such as a signal generator, vector network analyzer, or transmitter—and a load. It measures both the RF power from the source to the load—the forward component—as well as the reflected component, power reflected back from the load to the source. Knowing the forward and reflected components permits the computation of total power, return loss, and standing wave ratio of the load.