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Home My WebLink About2011-09-06 Planning Board Supplemental Materials (74) TAB 7 �■ A❑D MAXIMUM PERMISSIBLE communications EXPOSURE STUDY .�. at&t Site Number: MA3045 Site Name: North Andover, MA Latitude: 42.646111 Longitude: -71.093889 Address: 5 Boston Street North Andover, MA Conclusion: AT&T's proposed antenna installation is calculated to be within the FCC Standard for Uncontrolled/General Public and Controlled(Occupational Maximum Permissible Exposure(MPE). Prepared by: SAI Communications 260 Cedar Hill Street Marlborough, MA 01752 508-573-5410 Date of Report: June 6, 2011 Table of Contents Introduction..................................................................................................................................................3 RFExposure Prediction Method..............................................................................................................3 Case Summary................................................................................................................. ........4 .................. RF Design Specifications............................................... ..............4 FCCGuidelines..........................................................................................................................................5 FCCRF Exposure Limits...........................................................................................................:..............6 CalculationResults....................................................................................................................................7 Statementof Certification..........................................................................................................................8 Page 2 Introduction SAI Communications has conducted this theoretical analysis for AT&T, to ensure that the proposed radio facility complies with Federal Communications Commission (FCC) regulations. This report will show that, through the use of FCC suggested prediction methods, the radio facility in question will be in compliance with all appropriate Federal regulations in regards to Radio Frequency (RF) Exposure. RF Exposure Prediction Method Power Density is calculated in accordance with FCC OET Bulletin 65 formula (7): 2.S6* 1.64*ERP,,,,. S R 4 *n * Rz V Va Calculation Point V, H Ground Level Where: S = Power Density ERPre,= Effective Radiated Power relative to antenna pattern R = Radial distance = Hz + Vz H = Horizontal distance from antenna V= Vertical distance from antenna = Va—Vb Va = Antenna height above ground Vb = Calculation height above ground = 6ft Page 3 Case Summary The proposed radio facility will have a radiation center of 68ft located at the following geographic coordinates: Latitude: 42.646111 Longitude: -71.093889 See sketch below for specific property location. Baa h any e M MA3045 - North Andover, MA �tlA°A n� V a1 Sf EPhtyA Or Y RF Design Specifications AT&T Mobility is planning to install 3 panel antennas, 1 per sector, for LTE Technology, with azimuths of 60-180-290 for alpha-beta-gamma sectors, in addition to the existing GSM/UMTS antennas. Table below shows the technical data used for the calculation. GSM850 I GSM1900 UMTS860 I UMTS1900 LTE700 LTE2100 Antenna Type: Kathrein Kathrein Powerwave 80010121 80010121 P65-17-XLH-RR Antenna Gain (dBd) 11.35 14.35 11.35 14.35 15.05 15.35 Rad Center, AGL (ft) 68 68 68 68 68 68 ERP (dBm) 50.33 56.34 53.34 59.35 60.05 60.35 No of Radios 4 2 1 1 1 1 Page 4 FCC Guidelines Table 1. MPE Limits for General Population/ Uncontrolled Exposure Magnetic Electric Field MagPower Averaging Time for Frequency Range Strength Field Density JE 12, IH 12 , or S (MHz) Strength (A/m) (mW/cm2) (Minutes) 0.3— 1.34614 1.63 100 * 30 1.34 -30 824/f 2.19/f 180/f2 * 30 30-300 27.5 0.073 0.2 30 300— 1500 0F f/1500 30 1500— 100,000 0 1.0 30 f=frequency in MHz *= Plane wave equivalent power densit General population/uncontrolled exposures apply in situations in which the general public may be exposed, or in which persons that are exposed as a consequence of their employment may not be fully aware of the potential for exposure or can't exercise control over their exposure. Table 2. MPE Limits for OccupationaUGontrolled Exposure Frequency Range Electric Field Magnetic Field Power Averaging z ime (MHz) Strength (Wm) Strength (A/m) Density for �E� , �H� , or MW/CM2) S Minutes 0.3 -3.0 614 1.63 (100)* 6 3.0-30 1842/f 4.89/f 900/f 30-300 61.4 0.163 1.0 300- 1500 0 f/300 6 1500— 100,000 f=frequency in MHz * = Plane wave equivalent power density Occupational/controlled limits apply in situations in which persons are exposed as a consequence of their employment provided those persons are fully aware of the potential for exposure and can exercise control over their exposure. Limits for occupational/controlled exposure also apply in situations when an individual is transient through a location where such occupational/control/ed limits apply provided he or she is made aware of the potential for exposure. Page 5 FCC RF Exposure Limits FCC MPE LIMITS (mW/cm2 EXPOSURE ENVIRONMENT AT&T FREQUENCY BANDS Cellular PCS General Public Uncontrolled 0.59 1.0 Occu ationalControlled 2.93 5.0 1,000 —occupation allcontroIled Exposure -----General PopulatloWncontroIIed Exposure 100 --- -- ---- u � C � 1 10 --- --___ —_- - - C d O % a 1 - -- - -- _i� 0 0 1 10 •100 1,000 10,000 100,000 Frequency, MHz Maximum Permissible Exposures_ Occupational/Controlled and General Population/Uncontrolled MPE's are functions of frequency. Page 6 Calculation Results (6ft AGL) The following charts show the graphical representation of the calculated AT&T contribution on power density levels and % MPE at 6ft above ground, as horizontal distance from antenna increases. The calculations take into account the vertical pattern of the antennas and represent the immediate direction of each sector azimuth within the antenna horizontal beamwidth. The calculations also assume line of site to the antennas and the result will be lower if measured indoor due to in-building penetration loss. Power Densi and %MPE 1 , at . — - N 0.01 E 0.001 E —GSM850 0.0001 I - - —GSM1900 .a- —UMTS850 'N 0.00001 � — —q--- - —UMT51900 W 1 —LTE700 123 0.000001 —LTE2190 3 I a 0.0000001 ---- 1 10 100 1000 10000 Horizontal Distance from Antenna,ft 1000.0009% 100.0000% Pe,ki0nco trolled G(neral 10.000000/a — Publlcf,391I.45ft 0114]41% Peak(.. ntrolled/Occu Q. liahona l,. 891.45k,O.Q948 1.0000% e i —Uncontrolled —Controlled O 0.1000% _LlmIt _— Peak 0,0100% 0.0010% -_........_...0.0001% 1 10 100 1000 10000 Horizontal Distance from Antenna,ft Page 7 Statement of Certification I certify to the best of my knowledge that the statements contained in this report are true and accurate. The theoretical computations contained are based on FCC recommended methods, with industry standard assumptions&formulas, and complies with FCC mandated Maximum Permissible RF Exposure requirements. A comprehensive field surrey was not performed prior to the generation of this report. If questions arise regarding the calculations herein, SAI Communications recommends that a comprehensive field survey be performed to resolve any disputes. Aan_ June 6, 2011 Matthew Smelcer Date SAI Communications Page 8