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TETRA base station

Belongs to:
TETRA
Description:

TETRA base stations are sorted into the following power classes (P is the power of one transmitter):
class1: P = 40 W
class 2: P = 25 W
class 3: P = 16 W
class 4: P = 10 W
class 5: P = 6.3 W
class 6: P = 4 W
class 7: P = 2.5 W
class 8: P = 1.6 W
class 9: P = 1 W
class 10: P = 0.6 W
For the safety of citizens, in Germany, the Federal Network Agency for Electricity, Gas, Telecommunications, Post and Railway (Bundesnetzagentur) has to approve the building of a new base station with a transmission power > 10 W in form of a site approval. This also applies to base stations with a transmission power < 10 W if there are already other transmitters at the location of interest.

Frequency ranges:
  • 385–390 MHz (Europe-wide for the TETRA/BOS uplink)
  • 395–400 MHz (Europe-wide for TETRA/BOS in the downlink)
  • 410–420 MHz (for the uplink)
  • 420–430 MHz (for the downlink)
  • 450–460 MHz (for the Uplink)
  • 460–470 MHz (for the Downlink)
  • 870–876 MHz (for the uplink)
  • 915–933 MHz (for the downlink)
Type of field:
electromagnetic

Measurements (acc. to literature)

Measurand Value Feature Remarks
electric field strength 0.02 V/m (mean, measured) - averaged over 30 measurement points [1]
electric field strength 0.05 V/m (mean, measured) - average value of 18 participants, who were monitored with an RF exposimeter for 24h [2]
electric field strength 0.07 V/m (maximum) - maximum value measured outdoor in an urban area during the day [3]
electric field strength 0.18 V/m (maximum, measured) - maximum value of 18 participants, who were monitored with an RF exposimeter for 24h [2]
power density 0.85 µW/m² (mean) - arithmetic mean value of 213 measuring points in 2009 [4]
power density 3 µW/m² (measured) - in rural areas of Sweden; measurements comprise both hand radio sets and base stations [5]
power density 5.4 µW/m² (measured) - in urban areas of Sweden; measurements comprise both hand radio sets and base stations [5]
power density 6 µW/m² (measured) - in the capital city of Sweden (Stockholm); measurements comprise both hand radio sets and base stations [5]
power density 0.028 mW/m² (maximum) - maximum value out of 311 measuring sites [6]
power density 0.159 mW/m² (maximum) - measured 1 m above ground, without line of sight, at a distance of 30 m from a 16 high antenna, indoor [6]
power density 0.47 mW/m² (maximum) - measured 1 m above ground, outside main beam, at a distance of 20 m from the 16 m high antenna, with line of sight, outdoor [6]
power density 4 mW/m² (maximum) - measured 1 m above ground within main beam, at a distance of 42 m from a 16 m high antenna, with line of sight, outdoor [6]
power density 10 mW/m² (maximum) - at a distance of 4.95 m, including a shielding window at a distance of 2.8 m [7]
SAR 72.22 µW/kg (maximum) - max. value, whole-body SAR of 1-year-old child [3]
SAR 271 µW/kg (maximum) - at a distance of 4.95 m, inculding a shielding window at a distance of 2.8 m (body surface area: 1.9 m², weight: 70 kg) [7]
SAR 0.08 W/kg (maximum) - mean value as regards the whole body [8]

References

  1. Joseph W et al. (2010): Assessment of general public exposure to LTE and RF sources present in an urban environment
  2. Valic B et al. (2015): Typical exposure of children to EMF: exposimetry and dosimetry
  3. Joseph W et al. (2010): Estimation of whole-body SAR from electromagnetic fields using personal exposure meters
  4. Tomitsch J et al. (2012): Trends in residential exposure to electromagnetic fields from 2006 to 2009
  5. Estenberg J et al. (2014): Extensive frequency selective measurements of radiofrequency fields in outdoor environments performed with a novel mobile monitoring system
  6. Doll R et al. (2001): Possible Health Effects from Terrestrial Trunked Radio (TETRA): Report of an Advisory Group on Non-Ionising Radiation
  7. Wallace D et al. (2012): Cognitive and physiological responses in humans exposed to a TETRA base station signal in relation to perceived electromagnetic hypersensitivity
  8. Garilevich BA et al. (2006): Curative effect of general geomagnetic therapy