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PREMO & Wireless Technology through "Witech" radio module
Wireless technologies are being extended in exponential way, especially in the 2.4 GHz, which is nearly saturated with standards like Zigbee, Bluetooth and Wi-Fi. The presence of numerous devices in this band, including microwave ovens, makes the likelihood of interference is high and that the devices have to be designed with high frequency selectivity and very good quality at link level. This is also the reason because of new spread spectrum techniques (FHSS and DSSS) be needed to increase the immunity to electromagnetic noise.
Another of the handicaps from the use of 2.4 GHz band is that it is coincident with the resonant frequency of water, and therefore tends to be absorbed more quickly by structural elements (walls, ceilings, etc..), which makes difficult a good and big cover .
Choose the Sub-1GHz band, largely help to solve the problems of the 2.4 GHz although we must also take into account the limitations on restrictions on the duty cycle, no interoperability with other systems, and geographical limitation such as different frequency operation bands, 868MHz can no operate in USA or 915MHz can no operate in Europe, for example.
There are a variety of models available, from the front-end (external CPU) to the radio module integrated broadband or narrow band, with different CPU capabilities, and RF hardware interface: micro-strip antenna, ceramics, whip or SMA connector for external antenna, they can be adapted with total flexibility to design the final product.
From a hardware point of view the differences offers by modules of broadband and narrow band are: Narrowband: Sensitivity: Ultra-High (-114dBm), Link-budget: Extreme (until 2km, free-space), Average data speed: 25kbps/s, Ultra-low consumption (50uA, in Rx with 1s latency). Broadband: Sensitivity: High (-105dBm), Link-budget: High (until 1,5km, free-space), High data speed: 500 kbps, Ultra-low consumption (20uA, in Rx with 1s latency).
In general, the broadband module is suitable for most of the applications and the narrow-band one, is recommended when you need a link-budget extremely high, as is the case of transmission between network nodes for Remote Metering Applications, where is essential to ensure coverage between nodes in the network even when they are installed in basements and should communicate with adjacent building.
Automatic Meter Reading Networks (AMR) for water, electricity and gas
General Purpose Ad-Hoc Sensor Networks
Wireless Domotica Systems
Solar Panel Monitoring Networks
Marinas Dock Pedestals
Real Time Location Systems (RTLS)
Indoor Navegation and Access Control
Healthcare and Wellness Networks
Watering and Irrigation Control Networks
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