Radio Considerations; Setting The Rf Network - Noraxon Ultium EMG System User Manual

Ultium EMG Hardware User Manual
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9.3 Radio Considerations

The Ultium radio system operates in the 2400 MHz ISM (Industrial, Scientific and Medical) radio band
reserved for use in most countries of the world. The radio transfers data digitally using a proprietary
wireless sensor protocol. Other devices operating in this frequency band include computer networks,
microwave ovens, cordless phone sets and other WiFi enabled devices.
Despite all this competing radio activity the Ultium System can discern its information from all the
surrounding radio traffic. Reliable transmission depends on good signal quality. Signal quality will fall
with extended distances between the Ultium Receiver and the EMG Sensors. Obstructions (walls, metal
structures, trees, etc.) between the Ultium Receiver and the EMG Sensors will also lower the signal
quality.
The EMG sensors contain FLASH memory which backs up all measured data during a recording. The
companion software can query the FLASH memory to recover data that was lost to interference.
While the Ultium system is quite immune to interference, it does transmit a deliberate radio signal that
could affect nearby sensitive equipment. Users should always be aware of this possibility. In a similar
manner, although the energy level of the radio is considered harmless to human beings, it is still
prudent to minimize exposure.
Finally, although available worldwide, each country places certain restrictions on the operation of radios
in the 2400 MHz ISM band. These restrictions include allowable transmitter power levels and broadcast
frequencies

9.4 Setting the RF Network

The Ultium radio system utilizes a proprietary frequency hopping protocol for sensor communication.
Three RF Network addresses may be optionally selected to allow co-location of multiple Ultium
systems. All 3 networks hop on the same frequencies but the hopping order is unique to each network,
allowing them to co-exist without interfering with each other.
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