In this video, I'll tell unusual method, with which you can convert invisible electromagnetic waves in the audible range, which will not only hear the radio, but also to determine their capacity, type and direction.
Principle of operation
The basis I took a cassette player. In it there is the head that converts magnetic waves from the tape in the audio frequency voltage. The head is a inductor loaded on sensitive power play and at the expense of good catches electromagnetic waves. But the manufacturer has taken care of the fact that there were no unnecessary interference and well-shielded head. Therefore it is necessary to disassemble the player and turn off the shield wire from the head. All! Now the head into a dish. Whatever the player does not catch their own wave, we still disconnect the tape drive motor and feed it necessarily on batteries, otherwise it will be heard in the background 220. 50 Hz. Interestingly, the power of the player, in this mode, not only amplifies the signal, but also acts as an amplitude detector. As a result, the electromagnetic waves can be heard all radio band from 20 Hz to 50 GHz. The player is easy to catch even a very weak electromagnetic waves. I was able to hear the waves from a remote control and a wristwatch.
Listening to radio at home
It was found that almost all consumer electronics emits electromagnetic waves. You can determine the radiation power, guided by the volume and range of distribution. Although the player catches a wave at the same time from all sources, the nature of the sound can be easily understood from what source the strongest wave.
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