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FCC Radio Frequency Protection Guide
The U.S. Congress required (1996 Telecom Act) the Federal Communications Commission (“FCC”)
to adopt a nationwide human exposure standard to ensure that its licensees do not, cumulatively, have
a significant impact on the environment. The FCC adopted the limits from Report No. 86, “Biological
Effects and Exposure Criteria for Radiofrequency Electromagnetic Fields,” published in 1986 by the
Congressionally chartered National Council on Radiation Protection and Measurements (“NCRP”).
Separate limits apply for occupational and public exposure conditions, with the latter limits generally
five times more restrictive. The more recent standard, developed by the Institute of Electrical and
Electronics Engineers and approved as American National Standard ANSI/IEEE C95.1-2006, “Safety
Levels with Respect to Human Exposure to Radio Frequency Electromagnetic Fields, 3 kHz to
300 GHz,” includes similar limits. These limits apply for continuous exposures from all sources and
are intended to provide a prudent margin of safety for all persons, regardless of age, gender, size, or
health.
As shown in the table and chart below, separate limits apply for occupational and public exposure
conditions, with the latter limits (in italics and/or dashed) up to five times more restrictive:
Frequency
Electromagnetic Fields (f is frequency of emission in MHz)
0.3 –
1.34 –
3.0 –
30 –
300 –
1,500 –
1.34
3.0
30
300
1,500
100,000
614
614
1842/ f
61.4
3.54 f
137
614
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27.5
1.59 f
61.4
1000
Power
Density
(mW/cm2)
Magnetic
Field Strength
(A/m)
Electric
Field Strength
(V/m)
Applicable
Range
(MHz)
1.63
1.63
4.89/ f
0.163
f /106
0.364
Equivalent Far-Field
Power Density
(mW/cm2)
1.63
2.19/ f
2.19/ f
0.0729
f /238
0.163
100
100
900/ f2
1.0
f/300
5.0
100
180/ f2
180/ f2
0.2
f/1500
1.0
Occupational Exposure
100
PCS
10
FM
Cell
1
0.1
Public Exposure
103
104
10
100
105
Frequency (MHz)
Higher levels are allowed for short periods of time, such that total exposure levels averaged over six or
thirty minutes, for occupational or public settings, respectively, do not exceed the limits, and higher
levels also are allowed for exposures to small areas, such that the spatially averaged levels do not
exceed the limits. However, neither of these allowances is incorporated in the conservative calculation
formulas in the FCC Office of Engineering and Technology Bulletin No. 65 (August 1997) for
projecting field levels. Hammett & Edison has built those formulas into a proprietary program that
calculates, at each location on an arbitrary rectangular grid, the total expected power density from any
number of individual radio sources. The program allows for the description of buildings and uneven
terrain, if required to obtain more accurate projections.
0.1
1
FCC Guidelines
Figure 1
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#
! Overall Height 977 ft above ground
KGO-TV, Ch. 7
KQED/KMTP/KCNS/KCSM-TV
Ch. 30/33/39/43
KPIX-TV/KRON-TV/
KTVU Ch. 29/38/44
KFSF-DT, Ch. 34
elevator
KOFY-TV, Ch. 19
KBCW, Ch. 45
KOIT, 96.5
KQED-FM
KFOG, 104.5
KEMO-TV, Ch, 32 DTS
KREV (FM), 92.7
KOSF, 103.7
KTNC-TV D14
ENG receive
}
KSOL, 98.9
Auxiliary antennas
KOFY-TV/KPIX-TV
KFSF-DT/KRON-TV/KTVU
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#
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Communications
receive antennas (7)
KREV
KOIT
STL receive dish
weather cameras
Bayweb (6)
KTNC-TV D14 Auxiliary
!
KQED/KMTP
KCNS/KCSM-TV/KBCW
Ch.30/33/39/43/45
SF Community
Broadband (15)
KGO-TV
88.9 MHz FM translator
KFOG
Microwave Antennas
KMTP-TV
KCSM-TV
Bridge Cams (6) KOSF
San Bruno Mtn
SF Airport
KOIT (to be relocated)
KSOL
Site Elevation 854 ft AMSL
Auxiliary antennas in italics. Proposed new antennas in red. Not to scale.
120221.5
Figure 3