2kW Directional Coupler

The directional couplers are used to measure power and SWR of the input, LPF input and output.
This design is from Kurt (DJ0ABR) which i also modified to 0805 SMD components.
A detailed description and assembly instruction can be found HERE.

This is a Sontheimer / Fredrik directional coupler to measure forward and reverse power.
The measurement amplifier ia based on the AD8307 logaritmic amplifier from Analog Devices to convert
the measured power into 0.3...2.4V signal.