BASIC TELECOMMUNICATIONS . RF (Radio Frequency) technology . BASIC TELECOMMUNICATIONS .
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RF (Radio Frequency) technology
Radio frequency (RF) is a rate of oscillation in the range of about 3 kHz to 300 GHz, which corresponds to the frequency of radio waves, and the alternating currents which carry radio signals. RF usually refers to electrical rather than mechanical oscillations
In order to receive radio signals an antenna must be used however, since the antenna will pick up thousands of radio signals at a time, a radio tuner is necessary to tune in to a particular frequency (or frequency range)
This is typically done via a resonator – in its simplest form, a circuit with a capacitor and an inductor forming a tuned circuit, the resonator amplifies oscillations within a particular frequency band, while reducing oscillations at other frequencies outside the band
Simple radio tuner
400,000,000,000,000 = 4THz (400 Trillion Hz)
Here is the visible
light spectrum that
we can see
As a matter of convenience, longer and slower waves, such as ocean surface waves, tend to be described by wave period rather than frequency. Short and fast waves, like audio and radio, are usually described by their frequency instead of period. These commonly used conversions are listed below:
Now that you know the basics of RF and the frequency spectrum let’s take a look at Modulation.
Modulationis the process of varying one or more properties of a high-frequency periodic waveform, called the carrier signal, with a modulating signal which typically contains information to be transmitted
the red signal is
impose on the
wave and the
output is the