WAGO I/O System 750
List of Figures 49
750-940 EnOcean RS-485 Gateway; 868 MHz
Manual
Version 1.3.0, valid from FW/HW Version 01/01
5.5.6
Fresnel Zone
Just having a direct line of connection between transmitter and receiver without
any obstacles is not enough to ensure the maximum radio range (open air) is
reached.
There must also be a certain surrounding open area, known as the Fresnel zone.
In spatial terms, the Fresnel zone is an ellipsoid.
The greatest widening of the ellipsoid falls at the center point of the connection
line. Thus, to achieve maximum ranges, there must not be any prominent
obstacle at this position.
Figure 19: Fresnel Zone
Pos: 62 /Dokumentation allgemein/Gliederungselemente/---Seitenwechsel--- @ 3\mod_1221108045078_0.docx @ 21810 @ @ 1
