Is it possible to track the signal of the radio? History and modernity of the question

Almost all the forums devoted to radio, periodically the question arises whether it is possible zapelengovat a working radio. The most “advanced”, who still remembers the basics of physics, the answer is that it is possible because the receiver has a local oscillator that radiates, others say that is impossible. The question was relevant 30 years ago, when people secretly listened to “voices”, but now you can hear horror stories about that if you configure the receiver on the “militia wave”, the owner immediately come.

So can we or not? Try to understand and experiment.
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The practical use of ROS on the Raspberry Pi — part 1

Good day, dear readers Habra!

I’m starting a series of articles on the practical use of ROS on the Raspberry Pi for robotics projects in conjunction with the Arduino. This cycle has the following structure:
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