The Model DC3510A is a high power ultra-broadband dual directional coupler with excellent performance characteristics over a range of more than 14 octaves. This dual directional coupler is a convenient means of simultaneously monitoring forward and reflected power in RF power systems using normal laboratory oscilloscopes, voltmeters, power meters and spectrum analyzers. The Model DC3510A is uniquely suited for use with our A, L and W series low power amplifiers, other amplifiers operating within this frequency and power range, and our PM2002 power meter.