Frequency, Amplitude, Phase: 3 RF Characteristics

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In this video, Bob Salmans covers three defining characteristics of radio signals: frequency, amplitude and phase. Radio theory can be complicated, but don't be intimidated. Bob makes understanding radio frequency characteristics simple by covering these topics:

What attenuation is and how it relates to other RF characteristics

How frequency is defined, where in the range of frequencies wireless fits in

What amplitude measures

The difference between signals being in-phase and out-of-phase

As a radio signal travels through the atmosphere, it runs into things and loses energy. Just like a wave in a pond from a dropped pebble becomes fainter as it pushes more and more water, or has to work its way around logs and branches, when a radio signal weakens over time and distance it's called attenuation.

Frequency is measured in hertz — the number of complete cycles of wave forms in one second. The spectrum is vast, but wireless falls on a narrow part of it. You can't receive a signal if you're not listening to the frequency it's being broadcast on.

Amplitude measures the height of the waveform — not the wavelength. This measures the power that's in the broadcast. Similar to frequency, you need to be receiving on the same amplitude as the signal is being broadcast on to hear it.

Phase describes what happens when two different signals occupy the same space. If two signals are in-phase, they're being sent on the same frequency and overlap — and their power becomes additive. Signals that are out of phase can negate one another's broadcast and reduce signal strength.

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