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Low-power communication device



In telecommunication, a low-power communication device 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.

Additional recommended knowledge

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).

Channel Frequency (MHz) Channel Frequency (MHz) Channel Frequency (MHz)
1 433.075 24 433.650 47 434.225
2 433.100 25 433.675 48 434.250
3 433.125 26 433.700 49 434.275
4 433.150 27 433.725 50 434.300
5 433.175 28 433.750 51 434.325
6 433.200 29 433.775 52 434.350
7 433.225 30 433.800 53 434.375
8 433.250 31 433.825 54 434.400
9 433.275 32 433.850 55 434.425
10 433.300 33 433.875 56 434.450
11 433.325 34 433.900 57 434.475
12 433.350 35 433.925 58 434.500
13 433.375 36 433.950 59 434.525
14 433.400 37 433.975 60 434.550
15 433.425 38 434.000 61 434.575
16 433.450 39 434.025 62 434.600
17 433.475 40 434.050 63 434.625
18 433.500 41 434.075 64 434.650
19 433.525 42 434.100 65 434.675
20 433.550 43 434.125 66 434.700
21 433.575 44 434.150 67 434.725
22 433.600 45 434.175 68 434.750
23 433.625 46 434.200 69 434.775

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.

Band A 868.00625 MHz -> 868.59375 MHz 48 Channels
Band B 868.70625 MHz -> 869.19375 MHz 40 Channels
Band C 869.41250 MHz -> 869.63750 MHz 10 Channels
Band C2 869.31250 MHz -> 869.38750 MHz 4 Channels
Band D 869.70625 MHz -> 869.99375 MHz 24 Channels

References

  • Federal Standard 1037C
  • NTIA Manual of Regulations and Procedures for Federal Radio Frequency Management
 
This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Low-power_communication_device". A list of authors is available in Wikipedia.
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