LoRa Duty Cycle Ceilings That Decide Payload Frequency
LoRa duty cycle ceilings restrict packet frequency by limiting hourly transmission airtime, forcing trade-offs between spreading factor, payload size, and battery life.
Sub-GHz ISM Bands
Meaning
Unlicensed frequency ranges located below the one gigahertz threshold provide long range communication capabilities for low power devices. These sub-ghz ism bands are used globally for industrial, scientific and medical applications because they offer a good balance between data rate and propagation distance. Unlike the crowded two point four gigahertz band, these lower frequencies are less prone to interference from common consumer electronics like wi-fi and bluetooth.
Regional Variation
Different countries allocate different parts of the spectrum for unlicensed use, which requires manufacturers to produce region-specific versions of their hardware. A device built for the North American market cannot be used in Europe without being retuned to the correct frequency.
Propagation Advantage
Lower frequency signals have longer wavelengths that can bend around obstacles and pass through materials with less attenuation. This physical property allows a single gateway to cover a much larger area than is possible with higher frequency technologies.
Licensing Status
Users can operate equipment in these bands without paying for a specific license, provided that the hardware meets the technical requirements set by the local regulator. These requirements include limits on transmission power and the duration of each broadcast. The availability of free spectrum encourages the deployment of large scale sensor networks in agriculture and smart city projects.