Satel SATELLINE-EASy Guía de usuario descargar pdf (Pagina 95)

SATELLINE-EASy Pro

User Guide v.1.5

13.2 Radio field strength

Radio signal strength must be good enough for successful data transfer. Where field strength is

above a certain level, the operational results are very good. Below this level, a few dB marginal

areas occur in which errors begin to be generated by noise and interference that will eventually

lead to loss of connection.

The field strength is at its optimum level in open space, although increasing distance will still

reduce it. It must also be remembered that one open space has different environmental and

external factors to another, and that the effects on transmission quality must be taken into account

when planning the system.

Ground, ground contours and buildings cause attenuation (loss of energy through absorption)

and reflection of radio waves. Buildings reflect radio waves and therefore the affects of

attenuation are not as acute when transmission is over a short distance.

However, the reflected waves will often be a bit delayed, and when they combine with the direct

radio waves they interact in either a weakening or a strengthening way. This causes the fading

effect in mobile systems. In reality very sharp signal drops spaced about 35 cm apart may occur.

The attenuation may even reach 40 dB, normally less.

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Satel SATELLINE-EASy Guía de usuario Pagina 95