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Measurements of Electromagnetic Fields in the Close Proximity of CB Antennas

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Paul S. Ruggera · 1979

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This 1979 study measured RF field strength near CB antennas, establishing early exposure assessment methods for personal communication devices.

Plain English Summary

Summary written for general audiences

This 1979 government study measured electromagnetic field levels near CB (Citizens Band) radio antennas to understand exposure patterns in close proximity to these transmitters. The research examined RF field strength at various distances from CB antennas, which was important for establishing safety guidelines during the CB radio boom of the 1970s.

Why This Matters

This research represents an important early effort to quantify RF exposure from personal communication devices. CB radios were the smartphones of their era, with millions of Americans using these 27 MHz transmitters in homes, cars, and businesses. What makes this study particularly relevant today is that it examined close-proximity exposure patterns that parallel our current concerns with cell phones and wireless devices. The science demonstrates that understanding field strength variations near transmitting antennas remains crucial for exposure assessment. While CB radios operated at much lower frequencies than today's wireless devices, the fundamental physics of near-field exposure patterns established in studies like this laid the groundwork for modern RF safety standards.

Exposure Information

Specific exposure levels were not quantified in this study.

Cite This Study
Paul S. Ruggera (1979). Measurements of Electromagnetic Fields in the Close Proximity of CB Antennas.
Show BibTeX
@article{measurements_of_electromagnetic_fields_in_the_close_proximity_of_cb_antennas_g5072,
  author = {Paul S. Ruggera},
  title = {Measurements of Electromagnetic Fields in the Close Proximity of CB Antennas},
  year = {1979},
  
  
}

Quick Questions About This Study

CB radios operate in the 27 MHz frequency band, specifically between 26.965 and 27.405 MHz. This is much lower than cell phone frequencies, which typically range from 700 MHz to several GHz.
The study focused on "close proximity" measurements, though specific distances aren't detailed in available information. Close proximity typically means within several feet or meters of the antenna where field strength is highest.
The late 1970s saw explosive growth in CB radio use, with millions of Americans installing antennas on homes and vehicles. Government agencies needed field strength data to establish appropriate safety guidelines and exposure limits.
CB radios typically transmit at 4-5 watts, similar to many WiFi routers but higher than cell phones. However, CB frequencies are much lower than modern wireless, creating different exposure patterns and penetration characteristics.
While specific methods aren't detailed, 1979 RF measurement typically involved electric and magnetic field probes, spectrum analyzers, and systematic spatial mapping around antennas to characterize exposure zones and field strength variations.