As Nigel said, an oscillator will not receive anything. Almost all receivers have oscillators in them, but that is another story.
If you want to listen to your oscillator or function generator, use an ordinary radio.
Tune it to a clear frequency, lets say 700kHz.
Tune the oscillator to 700kHz, you should be able to hear the oscillator.
Try the same thing with your function generator, it should sound the same as the oscillator.
Now listen to the oscillator and the function generator at the same time, what do you hear?
JimB