LPD433

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LPD433 - Low Power Device 433 MHz band. Sometimes called SRD433 for Short Range Device 433 MHz band. Very low power short range 10mW 10milliwatts power limit. ITU Region 1 license free unlicensed service 433.05 MHz to 434.79 MHz ISM band (ITU Region 1 ISM only). May be used for data links, RC, garage door openers, remote sensing such as doorbells, wireless weather stations, etc. or voice. Narrow FM voice standardized for 69 channels starting at 433.05 MHz ending at 434.775 MHz. Note that datalink, telemetry and remote control or R/C systems do not have to follow the de facto standardized 69 FM voice channels frequency plan.

For example, 433.92 MHz is heavily used for data links and other short range purposes. However, not all 433 MHz devices are covered under the LPD433 service, some operate at Part 15 power levels, similar to garage door openers, keyfobs and other very short range RF systems (i.e. 310 MHz, 315 MHz, 390 MHz and other bands used by garage door openers and other remote control devices). LPD433 data link and telemetry systems offer range up to 1km or more with high quality antennas and radio chips.

Like other unlicensed, ISM and similar bands, LPD433 is being explored as a possible frequency band for narrowband Internet of Things IoT networks and similar technologies. Other bands considered for these purposes include the 860 MHz SRD allocation SRD860, the 902-928 MHz unlicensed band, and even the 26-28 MHz, 34 MHz, 35 MHz and 40 MHz SRD and RC bands.

Standardization: ETSI EN 300 220-2 short range devices 433,050 MHz to 434,790 MHz 433.050 MHz to 434.790 MHz 433.05-434.79 MHz.

Some handheld walkie talkies sold in Europe include both the original 8 PMR446 channels plus the 69 LPD433 channels for a total of 77 channels, despite the significantly reduced range on the LPD433 channels (10 milliwatts power on 433 MHz vs. 500 milliwatts on 446 MHz). However, these LPD433 + PMR446 dual service radios quickly dropped out of popularity once PMR446’s analog channels increased from 8 to 16, and digital PMR446 (DPMR446) capability for improved weak signal performance and as well as channel sharing / selective calling - CTCSS and DCS on analog, and various selective calling (group call, individual call, etc.) that 500mW digital PMR446 offers in addition to secure encrypted digital voice that a meager 10mW analog transceiver cannot compete with.

Like PMR446, LPD433’s allocation falls within the US allocation 70cm amateur radio band 420 MHz - 450 MHz.

LPD433 433 MHz 434 MHz FM voice channels:

  • Channel 1 - 433.050 MHz
  • Channel 2 - 433.075 MHz
  • Channel 3 - 433.100 MHz
  • Channel 4 - 433.125 MHz
  • Channel 5 - 433.150 MHz
  • Channel 6 - 433.175 MHz
  • Channel 7 - 433.200 MHz
  • Channel 8 - 433.225 MHz
  • Channel 9 - 433.250 MHz
  • Channel 10 - 433.275 MHz
  • Channel 11 - 433.300 MHz
  • Channel 12 - 433.325 MHz
  • Channel 13 - 433.350 MHz
  • Channel 14 - 433.375 MHz
  • Channel 15 - 433.400 MHz
  • Channel 16 - 433.425 MHz
  • Channel 17 - 433.450 MHz
  • Channel 18 - 433.475 MHz
  • Channel 19 - 433.500 MHz
  • Channel 20 - 433.525 MHz
  • Channel 21 - 433.550 MHz
  • Channel 22 - 433.575 MHz
  • Channel 23 - 433.600 MHz
  • Channel 24 - 433.625 MHz
  • Channel 25 - 433.650 MHz
  • Channel 26 - 433.675 MHz
  • Channel 27 - 433.700 MHz
  • Channel 28 - 433.725 MHz
  • Channel 29 - 433.750 MHz
  • Channel 30 - 433.775 MHz
  • Channel 31 - 433.800 MHz
  • Channel 32 - 433.825 MHz
  • Channel 33 - 433.850 MHz
  • Channel 34 - 433.875 MHz
  • Channel 35 - 433.900 MHz
  • Channel 36 - 433.925 MHz
  • Channel 37 - 433.950 MHz
  • Channel 38 - 433.975 MHz
  • Channel 39 - 434.000 MHz
  • Channel 40 - 434.025 MHz
  • Channel 41 - 434.050 MHz
  • Channel 42 - 434.075 MHz
  • Channel 43 - 434.100 MHz
  • Channel 44 - 434.125 MHz
  • Channel 45 - 434.150 MHz
  • Channel 46 - 434.175 MHz
  • Channel 47 - 434.200 MHz
  • Channel 48 - 434.225 MHz
  • Channel 49 - 434.250 MHz
  • Channel 50 - 434.275 MHz
  • Channel 51 - 434.300 MHz
  • Channel 52 - 434.325 MHz
  • Channel 53 - 434.350 MHz
  • Channel 54 - 434.375 MHz
  • Channel 55 - 434.400 MHz
  • Channel 56 - 434.425 MHz
  • Channel 57 - 434.450 MHz
  • Channel 58 - 434.475 MHz
  • Channel 59 - 434.500 MHz
  • Channel 60 - 434.525 MHz
  • Channel 61 - 434.550 MHz
  • Channel 62 - 434.575 MHz
  • Channel 63 - 434.625 MHz
  • Channel 64 - 434.650 MHz
  • Channel 65 - 434.675 MHz
  • Channel 66 - 434.700 MHz
  • Channel 67 - 434.725 MHz
  • Channel 68 - 434.750 MHz
  • Channel 69 - 434.775 MHz



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