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Terrestrial television

Belongs to:
Radio and TV
Synonyms:
DVB-T, NTSC, PAL, SECAM, Terrestrial television broadcast, television tower, television transmitter
Description:

Terrestrial television defines the television reception of an station on earth by home or indoor antenna. The term is used to define the difference to newer transmission technologies like satellite television, cable television or the internet. The listed measurement values comprise the emissions of the television towers. Measurements of the television receiver (TV set) are listed in the category "screen". Known transmission systems for the analogue colored television are NTSC, PAL and SECAM. For digital television DVB-T, ATSC, ISDB-T and DTMB are known. DVB-T is a standard for digital television broadcast that is used or a launch planed in many countries.

Frequency ranges:
  • 47–68 MHz (VHF I band)
  • 174–230 MHz (VHF III band)
  • 470–582 MHz (UHF IV band)
  • 582–862 MHz (UHF V band)
Type of field:
electromagnetic

Measurements (acc. to literature)

Belgium
Measurand Value Feature Remarks
electric field strength 0.03 V/m (mean, measured) 470 - 830 MHz in homes [1]
electric field strength 0.05–0.13 V/m (maximum, measured) 470 - 830 MHz measured with personal RF exposure meters in the city [2]
electric field strength 0.11 V/m (maximum) 174 - 830 MHz maximum value out of 41 measuring sights in rural areas [3]
electric field strength 0.34 V/m (maximum) 174 - 830 MHz maximum value out of 50 measuring sights is suburban areas [3]
electric field strength 0.83 V/m (mean, measured) 470 - 830 MHz in an office [1]
electric field strength 1.65 V/m (maximum, measured) 174 - 830 MHz maximum value out of 77 measuring sights in urban areas [3]
SAR 0.1–1 µW/kg (maximum, simulated) 470 - 830 MHz 95th percentile, calculated from E-field measurements for a one-year-old child (worst case) [2]
Germany
Measurand Value Feature Remarks
electric field strength 90–2,000 mV/m (min-max value, measured) 170 - 870 MHz typical values for whole range measurement with analogue and digital channels in Dortmund [4]
power density 0.013–6.724 µW/m² (mean, measured) 174 - 840 MHz median values for DVB-T in different emission areas [5]
power density 4.7 mW/m² (maximum, measured) 174 - 840 MHz maximal value of all measurements, full-frequency-range exposure [5]
Greece
Measurand Value Feature Remarks
electric field strength 0.77 V/m (mean, measured) 470 - 830 MHz in an office [1]
Great Britain
Measurand Value Feature Remarks
power 10–100 kW (maximum) 470 - 850 MHz effective radiated power from 26 out of 56 broadcast transmitters [6]
power ≤ 0.1 kW (maximum) 470 - 850 MHz effective radiated power from 406 out of 532 broadcast transmitters [6]
Italy
Measurand Value Feature Remarks
electric field strength 1 V/m (mean, measured) - field measurement at emission tower A with a DVB-T signal of transmission tower B in 20 m distance. Measurement spot at the temporal working place of a maintenance worker. Rms-value averaged over 6 minutes. [7]
SAR 0.5 mW/kg (mean, simulated) - simulation of the SAR value over 10 g tissue from field measurement at emission tower A with a DVB-T signal of transmission tower B in 20 m distance. Measurement spot at the temporal working place of a maintenance worker. Rms-value averaged over 6 minutes. [7]
not specified
Measurand Value Feature Remarks
electric field strength 1.65 V/m (maximum) 174 - 830 MHz maximum value out of 311 measuring sites [3]
electric field strength 3 V/m (maximum) 470 - 850 MHz public exposure from a high power 1 MW transmitter mast [6]
power 10–50 kW (maximum) 50 - 800 MHz input power of a single antenna [8]

References

  1. Vermeeren G et al. (2013): Spatial And Temporal RF Electromagnetic Field Exposure Of Children And Adults In Indoor Micro Environments In Belgium And Greece.
  2. Joseph W et al. (2010): Estimation of whole-body SAR from electromagnetic fields using personal exposure meters.
  3. Joseph W et al. (2012): Assessment of RF exposures from emerging wireless communication technologies in different environments.
  4. Landesumweltamt NRW et al. (2005): [Measurement of immissions of electromagnetic fields near a television transmitter - DVB-T and analogue TV during the simulcast phase in March 2005].
  5. Bornkessel C et al. (2007): [Determination of the public exposure due to electromagnetic fields of digital broadcast transmitters].
  6. Swerdlow AJ et al. (2012): Health Effects from Radiofrequency Electromagnetic Fields - RCE 20.
  7. Lopresto V et al. (2015): A case-study to assess compliance with exposure limit values for workers exposed to multiple frequency electromagnetic sources.
  8. Jokela K et al. (1999): Occupational RF Exposures.