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10.2. Electronic equipment
Thou most of modern electrical equipment is well RF (Radio Frequency) shielded there is no
certainty that radio waves emitted by the telemetry module's antenna may have negative
influence on its function.
10.2.1. Heart pacemakers
It is recommended that the distance between the antenna of telemetry module and the
Heart Pacemaker is greater than 20 cm. This distance is recommended by manufacturers
of Pacemakers and in full harmony with results of studies conducted independently by
Wireless Technology Research.
10.2.2. Hearing aids
In rare cases the signal emitted by the telemetry module's antenna may disturb hearing
aids functions. Should that occur, one has to study detailed operating instructions and
recommendations for that particular product.
10.2.3. Other medical equipment
Any radio device including the telemetry module may disturb the work of electronic
medical equipment.
When there is a need of installing telemetry module in vicinity of medical equipment one
has to contact the manufacturer of this equipment in order to make sure that the
equipment is adequately protected against interference of radio frequency waves (RF).
10.2.4. RF Marked equipment
The restriction against installing telemetry modules in areas marked as radio frequency
(RF) prohibition zones must be unconditionally observed.
10.3. Explosive environment
Installation of telemetry modules in the environment where explosion hazard is present is
not permitted. Usually, but not always, these places are marked with warning signs. Where
there is no marking do not install telemetry modules at liquid or gas fuels stores,
inflammable materials stores, nor places contaminated with metal or wheat dust.
11. Appendices
11.1. Data transmission in GSM systems
At the moment, a subscriber to GSM services has 3 technologies of sending data at his
disposal besides voice communication. These are: SMS, CSD and GPRS. Since they offer
different functionalities a short description is necessary.
11.1.1. SMS
„Short Message Ser vice
” - the technology of sending text messages. The length of the
message is 160 characters. Permitted characters are letters and numbers. Despite of its
popularity it is not an optimal service for telemetry. The cost of an SMS is constant
regardless of information length (within 160 characters limit).
