Environmental Assessment

1561-EX-ST-2017 Text Documents

Insitu

2017-10-23ELS_200103

Per CFR 47, section 1.1307.b(1), Table 1, all applications for experimental operations with an ERP greater than 100 watts require evaluation for compliance with human exposure limits defined in section 1.1310, and if exceeded require submission of an Environmental Assessment as defined in section 1.1311. The below calculations define the minimum safe working distance for both Occupational and General Public, which are based on the maximum permissible exposure limits of 5 mW/cm2 and 1 mW/cm2 respectively. These calculations were conducted using the highest gain antenna used in this operation. The antenna is a 2.7 meter parabolic dish. TX Peak Power (mW) 5000.00 TX Peak Power (dBm) 36.99 Maximum Antenna Gain dBi 33.30 EIRP (dBm) 70.29 Maximum Duty Cycle (Dc) 1.00 EIRP Watts 10689.81 Avg EIRP Watts 10689.81 TX Avg Power mW (Pavg) Pp*Dc 5000.00 Non Dimensional Antenna Gain Gt = 10dBi/10 2137.96209 Occupational General Public Minimum Safe Distance - Meters 4.15 9.3 Distance in Centimeters (R) 415 930 AVG Power Density mW/CmCm Pd At distance=R (Pavg*Gt)/(4*Pi)*R2 4.939283418 0.983545019 The antenna will be on the ground pointed toward the aircraft. Only authorized occupational workers will be allowed access to the area of operation. In addition the transmitter will be secured prior to conducting maintenance, and the area will be monitored during the operation to ensure that personnel are clear of any radiation hazard area.


Document Created: 2017-10-23 13:06:22
Document Modified: 2017-10-23 13:06:22
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