| Continuous recording instrument for RF-exposure measurements in FM/TV broadcasting towers. | |
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MedLine Citation:
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PMID: 6567669 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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A continuously recording exposure meter has been developed for radio-frequency (RF) hazard measurements in FM/TV broadcasting towers for the frequency range 47-790 MHz. The instrument consists of an electrically-small dipole, loop probes and recording electronics. The dipole and loop are attached to the safety helmet; their distance from the head is approximately 7 cm. The dipole and loop respond to the tangential E field and radial H field, respectively. The error due to body proximity and one-dimensionality is 1 to 2 dB at 100 MHz and 2 to 3 dB at 200 MHz (for average power density measurements) if the probes move continuously and the measurement period is sufficiently long. Measurements in Finnish FM/TV towers showed that the average power density inside the tower increases with increasing power and decreasing antenna surface area. The highest levels have been found near UHF and FM antennas. For the FM band (100 MHz) the average H field exposures exceed the new ANSI standard value 10 W/m2, but remain in most cases below 100 W/m2. Local maxima may exceed 300 W/m2. |
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Authors:
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K Jokela; M Ylönen |
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Publication Detail:
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Type: Journal Article |
Journal Detail:
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Title: The Journal of microwave power Volume: 19 ISSN: 0022-2739 ISO Abbreviation: J Microw Power Publication Date: 1984 Sep |
Date Detail:
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Created Date: 1984-12-19 Completed Date: 1984-12-19 Revised Date: 2004-11-17 |
Medline Journal Info:
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Nlm Unique ID: 0332155 Medline TA: J Microw Power Country: CANADA |
Other Details:
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Languages: eng Pagination: 159-72 Citation Subset: IM |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
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Humans Maximum Allowable Concentration Radiation Monitoring / instrumentation* Radio Waves* Television* / standards |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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