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Chapter 18:
Atmospheric Effects on Signals
The atmosphere causes several serious negative effects upon radio signals, and these effects are very dependent on three things. The first factor is the frequency in use: some frequencies - the lower ones - are hardly affected; higher frequencies are greatly affected. The second factor is the elevation of the satellite as seen from the earthstation, which determines how much air the radio wave traverses. The third major factor is the climate of the location of the earthstation.
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