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You might be right about the computer being the problem.

Try feeding the tone from the sound card directly into the input of the sound card..... SINAD display should be great with only one vertical pip on the display.

In other words, do not take the recovered audio from the radio and feed it into the input of the SINAD meter, but take the cable that you used to send the 1kc tone to the generator and put it into the SINAD meter input.

I hate to say this (not) but there might be some trouble shooting/testing recommendations in the operations manual for the SINAD software program.

We are not going to fail at this, only the test equipment can fail us.

Let's keep trying till we determine what is the problem.