Low-power communication device
- Low-power communication device
In telecommunication, a low-power communication device, also Short Range Device (SRD) is a restricted radiation device, exclusive of those employing conducted or guided radio frequency techniques, used for the transmission of signs, signals (including control signals), writing, images and sounds or intelligence of any nature by radiation of electromagnetic energy. Examples: Wireless microphone, phonograph oscillator, radio-controlled garage door opener, and radio-controlled models.
Low Power Device 433 MHz (LPD433) transceiver radios are short range, licence free communication devices used throughout Europe. They operate in the UHF band from 433.075 MHz to 434.775 MHz with 25 kHz channel spacing, for a total of 69 channels. These devices are Frequency Modulated (FM) with a maximum legal power output of 10 mW. LPD devices must only be used with the integral and non-removable antenna. LPD was introduced to reduce the burden on the 8 PMR446 channels over shorter ranges (less than 1 km).
European licence-free LPD transceivers also include Short Range Device 860 MHz (SRD860), which have a maximum legal power output of 5 mW. SRD has a total of 126 channels in five bands.
References
* Federal Standard 1037C
* NTIA Manual of Regulations and Procedures for Federal Radio Frequency Management
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