LPD433

From Wikipedia, the free encyclopedia
Jump to: navigation, search

LPD433 (Low Power Device 433 MHz) is a part of ITU region 1 ISM band which allows for licence free communication devices, using frequencies in the UHF band from 433.075 MHz to 434.775 MHz.

LPD hand-held radios are authorized for license-free voice communications use in most of Europe using analog frequency modulation (FM) as part of Short range device regulations,[1] with 25 kHz channel spacing, for a total of 69 channels. LPD devices must only be used with the integral and non-removable antenna with a maximum legal power output of 10 mW.

Voice communication in LPD band was introduced to reduce the burden on the eight PMR446 channels over shorter ranges (less than 1 km) .[citation needed] In some EU countries voice is not allowed over LPD.

LPD is also used by wireless instruments and digital devices such as car keylocks.

Channels[edit]

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

Usage by country[edit]

I.T.U. Region 1 (Europe)

U.K.

In the UK, LPD433 equipment that is type-approved can be used for model control, analogue/digitised voice and remote keyless entry systems.[2] There is significant scope for interference however, both on frequency and on adjacent frequencies, as the band is far from free. The frequencies from 430 to 440 MHz are allocated on a secondary basis to licenced radio amateurs who are allowed to use up to 40W (16dBW) between 430 and 432MHz and 400W (26dBW) between 432 and 440MHz. Channels 1 to 14 are UK Amateur repeater outputs and channels 62 to 69 are UK Amateur repeater inputs. This band is shared on a secondary basis for both licensed and licence exempt users, with the primary user being the Ministry of Defence.[3]

Ofcom, together with the R.S.G.B. Emerging Technology Co-ordination Committee have produced guidelines to help mitigate the side effects of interference to an extent.[4][5]

Other European countries

European Remote keyless entry systems often use the 433 MHz band, although, as in the UK, these frequencies are within the 70-centimeter band allocated to amateur radio, and interference results.

I.T.U. Region 2 (America)

In ITU region 2 (the Americas), the frequencies that LPD433 uses are also within the 70-centimeter band allocated to amateur radio. In the United States LPD433 radios can only be used under FCC amateur regulations by properly licenced amateur radio operators.

See also[edit]

References[edit]

  1. ^ CEPT/ERC REC 70-03 (22 August 2011)
  2. ^ "Table IR2030/1 Page 17 Non-Specific Devices & IR2030/23 Page 59 Model Control". Ofcom. November 2011. Retrieved 2012-09-25. 
  3. ^ "United Kingdom Frequency Allocation Table 2013". Ofcom. Retrieved 2014-01-07. 
  4. ^ "Interference between Short Range Devices and Amateur Repeaters". Ofcom. Retrieved 2014-01-07. 
  5. ^ "Paper on SRD Mitigation Techniques". R.S.G.B. Emerging Technology Co-ordination Committee. Retrieved 2014-01-07.