Non Ionizing Exposure Analysis 10222009NON - IONIZING ELECTROMAGNETIC EXPOSURE ANALYSIS
ENGINEERING CERTIFICATION
SITE NUMBER: WA580
SITE NAME: Yelm
SITE ADDRESS: 11247 Morris Road Southeast
Yelm, WA 98597
DATE: October 22, 2009
PREPARED BY:
B. J. THOMAS, P.E.
7607 801h Avenue NE
Marysville, WA 98270
(206) 851 -1106
PROJECT
The proposed AT &T project consists of a WCF (Wireless Communications
Facility) located on private property at 11247 Morris Road Southeast, Yelm, WA
98597, Thurston County tax parcel 22730430400. The planned improvements
include replacement antennas on an existing lattice tower with supporting BTS
(Base Transmission System) radio equipment located in a fenced lease area
near the base of the tower.
EQUIPMENT
Type of Service: GSM 1900, UMTS 1900, GSM 850, GSM 1900
Antennas: Kathrein 80010122
Sectors: (3) (X = 60 °, Y = 250 °, Z = 330 °)
Maximum Power: GSM 1900 - 965 w (59.85 dBm ERP)
UMTS 1900 - 676w (58.30 dBm ERP)
GSM 850 - 610 w (57.85 dBm ERP)
UMTS 850 - 676 w (57.85 dBm ERP)
Antenna Rad Center: 116.8' AGL
CALCULATIONS
Calculations for RF power densities near ground level are based on the
"Evaluating Compliance with FCC Guidelines for Human Exposure to Radio
Frequency Electromagnetic Fields OET Bulletin 65" Edition 97 -01, August
1997 issued by the Federal Communications Commission Office of Engineering
& Technology.
Section 2 of OET Bulletin 65 demonstrates that "for a truly worst -case prediction
of power density at or near the surface, such as at ground -level or on a rooftop,
100% reflection of incoming radiation can be assumed, resulting in a potential
doubling of predicted field strength and a four -fold increase in (far field
equivalent) power density ". Therefore the following equation is used:
S = EIRP /rrR2
Where S = power density (mW /cm2), EIRP = equivalent isotropically radiated
power and R = distance to the center of the radiation antenna (cm)
Attached as an exhibit are the MPE (Maximum Power Exposure) calculations
using the above referenced formula and the antenna manufacturers vertical
pattern information using a conservative 20 dB loss below main lobe.
The calculations show that the maximum MPE at ground level (6' above AGL) at
the base of the tower and the power density is 0.001343 mW /cm2 with power
levels as provided by AT &T RF Data Sheet. This is 0.2369% of the MPE limit for
the general population /uncontrolled exposure of 0.567 mW /cm2 as referenced in
Table I OET Bulletin 65 Appendix A for the lowest frequency range.
EXISTING CARRIERS
The drawings indicate there are three other carriers on the tower. Following are
examples of wireless carriers providing service in Thurston County:
ESMR 851 -866 Mhz Nextel
Cellular 869 -894 Mhz AT &T, Verizon
PCs > 1800 Mhz Sprint, T- Mobile, AT &T
Nextel facilities will have potentially higher power levels than cellular or PCs
facilities. In order to develop a "worst case prediction ", it is assumed that Nextel
facilities are currently on the monopole with maximum effective radiated power
(ERP) levels of 3,000 watts per sector verses 2,000 watts or less for cellular or
PCs facilities.
Wireless facility antennas are highly directional and project the majority of the RF
energy horizontally. Attached as an exhibit are the MPE (Maximum Power
Exposure) calculations using the referenced power density formula. These
calculations assume that the vertical patterns of the antennas suppress the ERP
by 20 dbB towards the antenna base. The calculations show that the maximum
total MPE at ground level (6' above AGL) at the base of the tower is 0.003504
mW /cm2 with the carriers operating at a total ERP of 3,000 watts per sector. This
is 0.6180% of the MPE limit for the general population /uncontrolled exposure of
0.567 mW /cm2 for the lowest Nextel frequency (851/1500) as referenced in Table
I OET Bulletin 65 Appendix A.
COLOCATED FACILITIES TOTAL MPE
The combined MPE for the AT &T and existing carrier using "worst case"
calculations is: 0.001343 mW /cm2 + 0.003504 mW /cm2 = 0.04847 mW /cm2
Total MPE.
ENVIRONMENTAL EVALUATION
Routine environmental evaluation is required if the PCS broadband facility is less
than 10 m (32.81 feet) AGL and has a total power of all channels in any given
sector greater than 2,000W ERP as referenced in "Table 2 Transmitters,
Facilities and Operations subject to Routine environmental Evaluation" of
Bulletin 66. As the proposed antennas lowest point above ground level is
34.7 m (113.7 feet), the WCF is categorically exempt from requirement for
routine environmental processing.
FCC COMPLIANCE
The general population /uncontrolled exposure near the tower, including persons
at ground level, surrounding properties, inside and on existing structures will
have RF exposure much lower than the "worst case" scenario, which is a small
fraction of the MPE limit.
Only trained persons will be allowed to climb the tower for maintenance
operations. AT &T and /or its contractors will provide training to make the
employees fully aware of the potential for RF exposure occupational training and
they can exercise control over their exposure that is within the
occupational /controlled limits.
CONCLUSIONS
Based on calculations, the proposed WCF will comply with current FCC and
county guidelines for human exposure to radiofrequency electromagnetic fields.
All representations contained herein are true to the best of my knowledge.
EXIHIBITS
• MPE Calculations
• Antenna Spec Sheets
• RF Data Sheet
• WCF Location Map
9. THOA
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WA580
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MPE Calculations
Eileenue lower height assumes a person 6 ft tall,
effective
radiation
lower
ain beam
n G.D hei9M ll
1.34E 03 1 height
hEpolenuse
lowest
0.001343 imaxpowerminsibrunin y
angle
GSM 1900
02369 %6 perwmageo stantlartl
hypolenuse
1168
110.8
hoaz. Ovid ..x
GSM 850
Note: 0.56] mWlcm° is 100 %0l allowable standard for lowed Iregoency
minor lobo
TOTAL f.34E03
effective
radiation
lower
ERP
enter
might
minor lobe
(feet). y
(feet), y
angle
GSM 1900
hyptonu5e
hypolenuse
1168
110.8
90
GSM 850
minor lobe
minor lobo
116.8
110.8
90
UMTS 850
length(km)
length (cm)
1168
110.8
90
UMTS 1900
EIRP(mW)
mWIrW2
116.8
1108
90
TOTAL f.34E03
ERP
ERP
Power at roimx
dB below
hod, disc,
hyptonu5e
hypolenuse
hyKeenose
main lobe
main lobe
minor lobe
minor lobe
minor lobo
at ground lovol
main lobe
x
length (feet)
length(km)
length (cm)
(walls)
(aging
ERP(agim)
EIRP(dBng
EIRP(mW)
mWIrW2
20
0.000
110.800
Mu
33]]184
965
59.85
3985
4201
15868.19
443E 04
20
0.000
110.800
0.034
33]].184
610
57.85
37.85
4001
10030.67
280E 04
20
0.000
110.800
0.034
33]].184
676
58.30
38.30
40.46
11115.95
3.10E -04
20
0.000
110.800
0,034
33]].184
676
58.30
38.30
40.46
11115.95
3.10E -04
TOTAL f.34E03
Effective tower height assumes a person 6 N tall.
vadcs hei M(ft)
WA580
Yelm
Other Carriers
MPE Calculations
effective
radiation tower
center height minor lobe dB below hods. disc
(feet), y (feet), y angle main lobe x
150 144 90 20 0.000
132 126 90 20 0.000
108 102 90 20 0.000
hyptonuse
length (feet)
144.000
126.000
102.000
hypotenuse
length (km)
0.044
0.038
11031
ERP ERP
hypotenuse mainlobe mainlobe minorlobe minor lobe
length (d.) (,,sits) (dBm) ERP(dBm) EIRP(dBm)
4389.120 3000 64.77 44.77 46.93
3840.480 3000 64.77 44.77 4693
3108960 3000 64.77 44.77 46.93
Power at point,
minorlobe at ground level
EIRP(mW) mW /cm "2
49331.15 8.15E -04
49331.15 1.06E -03
49331.15 1 62E -03
TOTAL 3.50E -03
tower
main beam
3.50E -03
height,
hypotenuse
0.003504
max power density in mW /cm
y
0.6180 °o
hoementage ofstandartl
M1OIiZ. OiSL.%
Note: 0.567
mW /cm° is 100% of allowable standard for lowest Nextel frequency
effective
radiation tower
center height minor lobe dB below hods. disc
(feet), y (feet), y angle main lobe x
150 144 90 20 0.000
132 126 90 20 0.000
108 102 90 20 0.000
hyptonuse
length (feet)
144.000
126.000
102.000
hypotenuse
length (km)
0.044
0.038
11031
ERP ERP
hypotenuse mainlobe mainlobe minorlobe minor lobe
length (d.) (,,sits) (dBm) ERP(dBm) EIRP(dBm)
4389.120 3000 64.77 44.77 46.93
3840.480 3000 64.77 44.77 4693
3108960 3000 64.77 44.77 46.93
Power at point,
minorlobe at ground level
EIRP(mW) mW /cm "2
49331.15 8.15E -04
49331.15 1.06E -03
49331.15 1 62E -03
TOTAL 3.50E -03
SCALA DIVISION
Kathrein's dual band antennas are ready for 3G applications,
covering all existing wireless bands as well as all spectrum
under consideration for future systems, AMPS, PCS and 3G/
UMTS. These cross - polarized antennas offer diversity operation
in the same space as a conventional 800 MHz antenna, and are
mountable on our compact sector brackets.
• Wide band operation.
• Exceptional intermodulation characteristics.
• Remote control ready.
• Various gain, beamwidth and downtilt ranges.
• AISG compatible.
• High strength pultruded fiberglass radome.
General specifications:
Frequency range 806 -960 MHz
1710 -2180 MHz
50 ohms
VSWR
<1.5:1
Intermodulation (2x20w)
IM3:< -150 dBc
Polarization
+45° and -45°
Connector
4 x 7 -16 DIN female (long neck)
Isolation intrasystem
intersystem
>30 dB
>45 dB (806 -960 H 1710 -2180 MHz)
Weight
59.5 Ib (27 kg)
Dimensions
75.5 x 10.3 x 5.9 inches
(1917 x 262 x 149 mm)
Equivalent flat plate area
6.16 ft2 (0.572 m')
Wind survival rating'
120 mph (200 kph)
Shipping dimensions
88.5 x 12 x 8 inches
(2249 x 304 x 204 mm)
Shipping weight
66.1 lb (30 kg)
Mounting
Fixed mount options are available for 2 to
4.6 inch (50 to 115 mm) OD masts.
See reverse for order information.
800 10122
880 Dualband Directional Antenna
806 -960 MHz
Horizontal pattern Vertical pattern
i45°- polarization s45 °- polarization
0°-10° electrical downtilt
1710 -2180 MHz
Horizontal pattern Vertical pattern
745°- polarization x45 ° - polarization
01-61 electrical downtilt
Specifications: 806 -866 MHz 824 -896 MHz 880 -960 MHz 1710 -1880 MHz 1850 -1990 MHz 1920 -2180 MHz
Average gain (dBi) 14.7 14.9 14.7 15 15.2 15 15 15.2 15 17.7 17.8 17.7 17.7 18 17.6 17.6 17.8 17.4
Tilt 01 51 10° 01 51 10° 0° 5° 10° 0° 3° 6° 0° 3° 6° 0° 3° 6°
rronrto-oacx ratio >29 ad (Co- polar) >23 ob (co- polar) >2J ab (Co- polar) >23 ab (Co- polar) >23 ab (co- polar) >zJ ab (co -polar)
Maximum Input power (at 50 °C)
per input 500 wafts
500 watts
500 watts
250 watts
250 watts
250 watts
total
1000 watts
500 watts
+451 and -451 polarization 881 (half - power)
86° (half - power)
880 (half - power)
82° (half - power)
85° (half - power)
90° (half- power)
horizontal beamwidth
+45° and -45° polarization 10.5° (half- power)
101 (half - power)
9° (half - power)
5.5° (half - power)
5.2° (half - power)
5° (half- power)
vertical beamwidth
Electrical downtilt 0°-101
01-10°
01-10°
0°-6°
0°--6°
0 °--6°
continuously adjustable
(manual or optional remote control)
0° 5° 10'T 0° 5° 10° T 0° 5° 10'T
16 16 14 dB 16 16 16 dB 16 16 14 dB
sidelobe above main beam
U- J- b- I u- J- b' I u- s- b- 1
18 18 16 dB 18 18 16 dB 18 18 16 dB
Cross polar ratio (typical)
Main direction 0° 18 dB 18 dB 20 dB 17 dB 16 dB 15 dB
Sector 760° >10 dB >10 dB >13dB >10d8 >12dB >10 dB
average 760° 16 dB 16 dB 19 dB 17 dB 19 dB 19 dB
RoHS
Tt7V
Load -Frcc
10726 -E
936.2900/b
Mechanical design is based on environmental conditions as
stipulated in EIA -222 -F (June 1996) and /or ETS 300 019 -1-
4 which include the static mechanical load imposed on an
antenna by wind at maximum velocity. See the Engineering
Section of the catalog for further details.
Kathrem Inc., Scala Division Post Office Box 4580 Medford, OR 97501 (USA) Phone: (541) 779 -6500 Fax: (541) 779 -3991
Email: communications @kathrein.com Internet: www.kathrein - scala.com
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