Final answer:
The output cable of the first directional coupler's output port was disconnected.
Step-by-step explanation:
The subject of this question is Physics and it is a question that would typically be asked in High School.
A directional coupler is a device used in electrical circuits to divide or combine power between two ports. In this case, the output cable of the first directional coupler's output port was disconnected. This means that the signal or power that was supposed to be transferred to that cable is not being transmitted.
As a result, there will be no output signal or power reaching the disconnected cable. The output measurement or signal would only be present on the connected cable. It is important to ensure that all cables are properly connected in order to receive the intended signal or power.