I adjusted the signals and cleaned up this circuit quite a bit.
So do we want a switch or a non-linear device? The answer is yes. The next question is which? The answer is do you want a large signal detector or a small signal detector? While it is good to be able to choose we have to be aware of the conditions and available resources. If you are building a multistage receiver with amplifiers or a crystal set or something in between will determine the requirement. The circuit above has lower signals that the previous post.
Anywho. I will post data for a high signal and low signal detector for you to examine.