Directional Coupler

The directional coupler decouples a part of the TX signal. This way we can observe the TX signal on the oscilloscope.

Figure: Picture of the Directional Coupler.

The directional coupler is used to observe the TX signal on the oscilloscope. The FWD port of the directional coupler is usually connected to the oscilloscope. You need to add a splitter to the oscilloscope Channel and terminate it with a 50 Ohm terminator.

The IN port is usually connected to the output of the RFPA.

The Probe port is usually connected to the TXport of the Transcoupler.