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10/2003
3.5
Notes on the radio operation
Conditions for the radio path
A radio path usually exists between a stationary unit (e.g. SDA or TRX245) and a
mobile unit (e.g. MPS, HT, MDA, BA).
Various physical quantities influence the signal propagation on the radio path. In
order to achieve a radio transmission which is as interference-free as possible, the
total of all of the physical parameters should be as good as possible. If the
individual conditions become worse, this does not immediately result in faulty radio
traffic. However, if several negative influences add up, this could result in increased
interferences in the radio transmission or it could completely collapse.
Parameters of a radio path:
●
Selection of the antennas:
The type of antenna is specified for the respective device used .
If it is necessary to optimize a radio path, it is possible to improve it by selecting
a high-quality antenna. Nevertheless, the fact has to be taken into account that
interfering frequencies might also be increased. An exact examination and
measurement of the radio path is necessary for each application.
●
Arrangement of the antenna:
With stationary units, the antenna should be installed in such a way that an
"obstacle-free" radio path can be set up, i.e. there are no fixed and, if possible,
no moving obstacles in the direct radio path.
●
Arrangement of several antennas:
Different antennas with different radio paths should be installed as far away
from each other as possible, otherwise interferences could occur. The same is
true regarding the selection of the frequencies. The greater the distance
between the frequencies is, the less interferences occur.
●
Radio link modules and frequencies:
When using different radio link modules or radio systems, you should make
sure that they do not send on the same or a similar frequency, but that different
frequency ranges are used; otherwise they could influence each other.
Operating Instructions SRIF 2002
Functional Description
Page 21 of 33
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