21-101703-NIER SC2064 Redondo Beach-ATTCH 6-04-28-2021-V1
NON-IONIZING ELECTROMAGNETIC EXPOSURE ANALYSIS
&
ENGINEERING CERTIFICATION
SITE NUMBER: SC2064
SITE NAME: Redondo Beach
SITE ADDRESS: 29601 8TH Ave SW
Federal Way, WA 98023
DATE: March 18, 2021
PREPARED BY:
B. J. THOMAS, P.E.
7607 80th Avenue NE
Marysville, WA 98370
(206) 851-1106
PROJECT
The proposed AT&T project consists of a WCF (Wireless Communications
Facility) located at 29601 8TH Ave SW, Federal Way, WA 98023, King County
tax parcel 0621049042. The planned improvements include (12) panel antennas
on a 55’ AGL replacement utility pole with supporting BTS (Base Transmission
System) radio equipment located near the base of the monopole in an equipment
shelter. utility pole
EQUIPMENT
Type of Service: LTE 700, LTE 1900, LTE AWS & 5G 850
Antennas: Cellmax CMA-UBTULBULBHH-6517-17-21-21
Sectors: (3) (X = 150°, Y = 270°, Z =65°)
Antenna Rad Center: 51’ 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/πR²
Where S = power density (mW/cm²), EIRP = equivalent isotropically radiated
power and R = distance to the center of the radiation antenna (cm)
The calculations show that the maximum MPE at ground level (6’ above AGL) at
the base of the utility pole and the power density is 0.007651 mW/cm² with an
assumed worst-case power level of 3,000 watts ERP for the lowest antenna
array. This is 1.6384% of the MPE limit for the general population/uncontrolled
exposure of 0.467 mW/cm² as referenced in Table I OET Bulletin 65 Appendix
A for the lowest frequency range.
SC2064 Redondo Beach
MPE Calculations
Effective tower height assumes a person 6 ft tall.
51 height (ft) 7.65E-03
0.007651 max power density in mW/cm2
1.6384% percentage of standard
Note: 0.467 mW/cm2 is 100% of allowable standard for lowest frequency
effective
radiation tower ERP ERP Power at point x
center height minor lobe dB below horiz. dist. hypotenuse hypotenuse hypotenuse main lobe main lobe minor lobe minor lobe minor lobe at ground level
(feet), y (feet), y angle main lobe x length (feet) length (km) length (cm) (watts) (dBm) ERP (dBm) EIRP (dBm) EIRP (mW) mW/cm^2
51 47 90 20 0.000 47.000 0.014 1432.560 3000 64.77 44.77 46.93 49331.15 7.65E-03
TOTAL 7.65E-03
horiz. Dist., x
hypotenuse
main beam
tower
height,
y
3/18/2021
12047v
CMA-UBTULBULBHH/6517/17/21/21
Antenna Type
2(4)
PRELIMINARY CMA-12047vA_B2 -20190730
Electrical Parameters R1 and R2:
Parameter (Radiation)
Frequency band MHz 698 - 798 824 - 894
Gain dBi 17.3 17.7
Azimuth Parameters
Azimuth (3dB) Beam Width ˚ 65 62
Azimuth Beam Squint ˚ 7 7
Front to Back Ratio (total
power) dB >25 >25
Cross-Polar Discrimination
(0˚) dB >20 >20
Sector Power Ratio % 7 7
Elevation Parameters
Elevation (3 dB) Beam Width ˚ 9 8
Electrical Downtilt Range ˚ 2 - 10 2 – 10
First upper Sidelobe
suppression dB >16 >16
First Nullfill Below Horizon dB - -
Parameter (ports)
Frequency band MHz 698 - 894
Impedance Ω 50
VSWR/Return Loss _/dB 1.5 / 14
Intra Array Isolation dB 28
Inter Array Isolation dB 28
Passive Intermodulation @
2x43 dBm CW dBc -158
Maximum Input Power per
port W 500
Antenna Insertion Loss dB 0.4
12047v
CMA-UBTULBULBHH/6517/17/21/21
Antenna Type
3(4)
PRELIMINARY CMA-12047vA_B2 -20190730
Electrical Parameters Y1 and Y2:
Parameter (Radiation)
Frequency band MHz 1710 - 1880 1850 - 1990 1920 - 2170 2490 - 2690
Gain dBi 196 19.6 19.9 21.4
Azimuth Parameters
Azimuth (3dB) Beam Width ˚ 64 66 67 52
Azimuth Beam Squint** ˚ 6 6 6 5
Front to Back Ratio (total
power) dB >25
>25
>25
>25
Cross-Polar Discrimination
(0˚) dB 17 22 22 21
Sector Power Ratio % 3.2 3.3 3.3 3.3
Elevation Parameters
Elevation (3 dB) Beam Width ˚ 4.9 4.6 4.4 3.4
Electrical Downtilt Range ˚ 1 – 10 1 – 10 1 – 10 1 – 10
First upper Sidelobe
suppression dB 15 16 16 14
First Nullfill Below Horizon dB >-24 >-21 -20 -16
Parameter (ports)
Frequency band MHz 1710 - 1880 1850 - 1990 1920 - 2170 2490 - 2690
Impedance Ω 50
VSWR/Return Loss _/dB 1.5 / 14
Intra Array Isolation dB 28 28 28 28
Inter Array Isolation dB 28 28 28 28
Passive Intermodulation @
2x43 dBm CW dBc -160
Maximum Input Power per
port W 500
Antenna Insertion Loss dB 0.5 0.5 0.6 0.8
12047v
CMA-UBTULBULBHH/6517/17/21/21
Antenna Type
4(4)
PRELIMINARY CMA-12047vA_B2 -20190730
Mechanical parameters
Mechanical specification:
Connectors 8 x 4.3 -10 female
Connector position Bottom
Lightning protection DC grounded
Height mm (inch) 2450 (96.5)
Width mm (inch) 690 (27.2)
Depth mm (inch) 196 (7.7)
Antenna weight kg (lb) 51 (112)
Wind load at 42 m/s (94 mph)
Frontal N (lbf) 1615 (363)
Lateral N (lbf) 321 (72)
Survival wind speed m/s (mph) 67
EPA m2 (inch2) 1.45 (2249)
Colour radome Light Grey, RAL 7035
Radome material ASA
Mounting hardware:
Mounting bracket 2
Bracket weight (complete) kg (lb) 7 (15)
Pole diameter mm (inch) 45 (1.8) - 120 (4.7)
Mechanical tilt range º 0 - 5
Packing data
Box size mm (inch)
Box weight kg (lb)
Pallet type
Maximum number of boxes
per pallet
Ordering information:
Product number Product description
RET info:
The RET actuator is AISG compatible and signals
Single-Antenna RET Device type 0x01 (hex) in AISG
protocol layer 2 as described in 3GPP TS25.462
(a.k.a. TYPE 1).
One RET actuator per antenna columns, with
individual AISG connectors in and out. The antenna
columns are R1, R2, Y1 and Y2.
CellMax actuator type CMA-RET-02
RET spare part order number: 110086.
12047v
CMA-UBTULBULBHH/6517/17/21/21
Antenna Type
1(4)
PRELIMINARY CMA-12047vA_B2 -20190730
8-port antenna unit
Frequency range MHz 698 - 894 698 - 894 1695 - 2690 1695 - 2690
Polarization x x x x
HBW ˚ 65 65 65 65
Gain dBi 17 17 21 21
EDT range ˚ 2 - 10 2 - 10 1 - 10 1 - 10
Product architecture
Product picture
Y2 R1 Y1 R2