Short Range Devices (SRD, formerly known as Low Powered Devices, LPD) operate on license-free radio bands, so anyone can operate them almost anywhere on the planet. Their RF output power is stictly limited to low rates such as 10mW (actual values depending on the region): these devices are good for short range communication (from a few hundred meters to a few kilometers), i.e. to transmit sensor data, remote-control a drone, or opening a garage door.
Overview
SRDs operate in four distinct sub-GHz frequency ranges: 315MHz, 433MHz, 868MHz, and 915MHz, and it depends primarily on your geographic location which frequency you may legally use:
- US:
- 915MHz most popular
- 315MHz used for older and simpler remote controls such as garage door openers, has only one channel
- Europe:
- 433MHz: most popular
- 868MHz: often used for sophisticated digital transmissions/LoRa. Requires better microcontroller control due to more complex regulatory rules (i.e. duty cycles)
EV1527 Frequency
Simple remote controls are often adhering to the EV1527 standard. In order for such remote controls and fobs to stay compatible, they all work on the same specific frequency (per ISM band):
| Frequency | Remark |
|---|---|
| 315.00MHz | US (older standard) |
| 433.92MHz | Europe/Asia |
| 868.35MHz | Europe/Asia |
| 915.00Mhz | US/Australia |
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(content created Apr 01, 2024 - last updated Mar 14, 2025)