So I get why we can’t use ONE single frequency, it’s sine and we can’t transfer data through it, it’s always gonna be constant. But what about using like 10 or 20 frequencies, something like from 2.4GHz to 2.4GHz10Hz (wrong syntax but you get what I mean). and use it to transfer the data.
I’m gonna give an other potentially wrong example, for radio, don’t we use one single frequency? we set our receiver to that frequency and get the transmitted data from the transmitter? or is it different from wifi because radio is simplex and wifi is half-duplex?
This ended up requiring 2 explanations (wifi and radio) but I’m more interested in the wifi use of a whole 20MHz channel instead of a smaller number of frequencies. Thanks.
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No, radio doesn’t use single frequency. AM radio channels occupy 10kHz band, FM channels occupy 200 kHz band. The frequency you tune in your radio is the middle of the channel (usually).
The channel with just 1 frequency cannot ever change the signal. Any change of the signal create sidebands (frequencies slightly above and below “main” frequency). The faster the change, the wider the sidebands. With ±10 Hz channel, you can change signal 10 times per second. With ±10kHz – 10000 times per second. With ±20 MHz channel – 20 million times per second.
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