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# Radio Communication Tutorial

Posted on 2011-10-20
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Last Modified: 2012-05-12
First, if anyone knows of a better section to put this under just tell me and I will move it. I am getting involved with radio communications which is not in my comfort zone and I am looking for a tutorial of break down of the system. I work for a company and I am slowly moving into the Motorola handhelds and the Motorola units that we have in our tech trucks. I am trying to help our current tech but I have a learning curve ahead of me. My main problem is understanding the difference in High Frequencies (VHF & UHF), 700Mhz, 800 Mhz, etc. What is there power, range, and benefits of each. I tried going to Google and Wikipedia, but I keep getting sent to web pages about television or other stuff that is not related to radio communication. ANY help would be greatly appreciated.
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Question by:Matthew_B
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Tiras25 earned 1000 total points
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Also, check out the ARRL website and handbook.

http://www.arrl.org/propagation-of-rf-signals

http://www.arrl.org

You should be able to find a copy of the handbook at most any public library.
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nobus earned 1000 total points
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The basis for radio frequency, is based on the actual radiowave, the wavelength of the commication broadcast being transmitted.

Wavelength is calculated by dividing the speed of light by the frequency.

As you increase frequency, wavelength gets smaller (up to microwaves) which requires less power to propogate through the atmosphere, but short wavelengths, cannot take advantage of the ionosphere to bounce around the world, like HF wavelengths.

Power restrictions are also goverened by Central organistions, as to what is allowable in each band.

So higher the frequency, better the range (sight to sight) without relay, or re-broadcast of signal. Power restrictions per band are governed, and some may required licenses to transmit in a certain band.

Please ask more questions.
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