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8
Instructions
To avoid any reduction of the reading distance of the reader, the antenna must not be brought next to a
metal surface. This could lead to a significant change of the properties of the antenna circuit, which in
turn reduces the reading range considerably!
To get reliable readings, the distance between antenna and transponder must be within the specified
reading volume.
The reading characteristic in front of the antenna is not isotropic. It depends also strongly on the orien-
tation between antenna and transponder. To get the maximum reading distance, the orientation between
reader and transponder must be well suited. The best orientation depends on the type of antenna inside of
the housing ( ferrite – type or plane coil type) and the applied transponder.
To get a reliable readings or writings, the time of transponder while crossing the sensitive area of the
antenna must be coordinated to the data transfer characteristics of transponder
In general the time depends on the speed of the transponder, the size of the transponder and the way the
transponder is mounted on the vehicle and must be verified by field tests.
Environmental electromagnetic noise may also reduce the read and write range consid-erably.
Arrangement to eliminate such troubles must be done specific to the application by the help of engineers
of the manufacturer.
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