This is a very low-cost signal generator I recently acquired.
Let’s do some experiment with a power splitter/combiner, PSCQ-2-7.5.
First, as a splitter:
A signal around 7MHz is applied to the sum port, and the output signals from port 1 and port 2 are observed. The phase difference of the two signals should be 90 deg.
Next, as a combiner.
Two signals with the frequency of 7010kHz and 7110kHz are applied to the port A and the port B, respectively.
This is what is observed at the sum port.