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It is sometimes assumed that for a long distance radio link, using a
radio operating at 900 MHz is better than at 2.4 GHz. This assumption
is based on the fact that, for any given distance, the attenuation
suffered by the radio waves (free space loss) increases with the
operating frequency. However the free space loss is not the only
factor that affects the link performance. This application note points
out other factors and compares the operation of the link at the two
frequencies.
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FCC Rules for the ISM band |
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Summary of the Federal Communications Commission (FCC) rules as they apply to wireless equipment operating in the 2.4 GHz ISM band.
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The first question asked by the novice to microwave networking
is always: "How fast does it go?" followed immediately by "What
distance does it cover?" The answers are not always simple, because
you can gain extra distance by giving up speed, and vice versa. In
addition, the performance of the system depends heavily on the
choice of antennas. Finally, the local environment (topography,
vegetation, weather) will influence your network performance.
This article is an attempt to explain the relationships between
these parameters, in order to enable you to properly compare
different equipment.
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Antennas are one of the most important parts of any radio
system. This is an introduction to antenna parameters and selection criteria for different applications.
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