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Urukhayy2016-06-12 15:03:30
Electronics
Urukhayy, 2016-06-12 15:03:30

How does the oscillatory circuit on the receiver recognize the frequency and send the correct one to the speaker?

1. How does the oscillatory circuit on the receiver recognize the frequency and send the correct one to the speaker?
2. Can an electromagnetic wave carry information about the polarity of the voltage that "created" it? After all, the antenna can receive alternating current, both direct and reverse.
3. If the radio receiver is not grounded and hung in the air so that the received electromagnetic wave does not go "to the ground" through the receiver, will the radio work? Is it necessary to ground the antenna?

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2 answer(s)
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Ocelot, 2016-06-12
@Ocelot

Highly recommended reading:
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A
Alexey, 2016-06-12
@alsopub

Chainikov's answers to Chainikov's questions:
1. Roughly speaking, the receiving circuit is tuned into resonance with the transmitting circuit using an LC chain, from which the output voltage at this frequency rises sharply. Watch the "detector receiver", which catches generally only with the help of a diode.
2. In principle, yes, but since the wave is periodic, it cannot be distinguished without perfect synchronization of the clocks of the transmitter and receiver. The same if you ask where the sine wave in the outlet first went - up or down. With the help of modulation, it can be transmitted along with sound, digital data, etc.
3. As such, the antenna is not grounded. Ground the "mass" of the receiver to improve reception. Most receivers operate without grounding. The current still flows through the antenna, the oscillatory circuit, the housing (ground).

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